JPS603288A - Color temperature compensation device for color television cameras - Google Patents

Abstract

PURPOSE:To attain proper color temperature compensation by arranging plural pairs of color detectors in or at the back side of a photographing lens and adding the color temperature of the incident light from an object and the surrounding of the object and a distance setting value to the object to a discriminating element for color temperature compensation. CONSTITUTION:Color detectors 31, 32 are arranged at the back side of the photograhing lens 36 and on the lower circumference. The reflected light itself from the object and the surrounding of object is added to the color temperature detector 31 by the color detectors 31, 32 and a color temperature signal is obtained. This color temperature signal is added to color temperature compensators 34, 35, and applied to a variable gain amplifier 12 of a red signal and a variable gain amplifier 13 of a blue signal to adjust the gain and to obtain the proper color temperature compensation.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a color temperature compensation device for a color television camera, which detects the color temperature of the light from a subject and the surrounding light itself over a wide range, and The object of the present invention is to provide a means for performing more appropriate color temperature compensation by adding a distance setting value to the evaluation judgment when performing color temperature compensation.

Prior Art (Figures 1 to 6) Figure 1 is a one-shot diagram of a color temperature compensation circuit of a conventional color television camera, Figure 2 is a configuration diagram of a color filter, and Figure 3 is a diagram of a color temperature compensation circuit of a conventional color television camera.
The figure is a block diagram of the color temperature compensation circuit of another conventional color television camera, and Figure 4 is a spectral characteristic diagram based on color temperature.
FIG. 5 shows a spectral characteristic diagram of red and blue signals depending on color temperature, and FIG. 6 shows a diagram showing gain correction ft'c' of red and blue signals depending on color temperature.

If the color temperature of the light illuminating the subject changes, the color temperature of the color television camera will change, and even if a white subject is photographed, it will no longer be photographed as white. Therefore, adjust the color temperature of the color television camera to be higher or lower. , color temperature compensation (Lt'
It is necessary to adjust the white balance by

This type of color temperature compensation circuit is shown in FIG. In the figure, a stripe-shaped color filter 1 is attached to the image pickup tube 2.
Place it. As shown in Fig. 2, this color filter l is intersected with cy, -w filter ■ and Y, -W filter II, and cy-w filter I is in phase with y, -w filter for each horizontal scan. (2) is arranged so that the phase is reversed every horizontal scan. The output of the image pickup tube 2 is sent to the preamplifier 3.
is amplified by the luminance signal Y! It is added to low-band P wave generators 4 and 5 that separate I and YL signals, and band f wave generator 6 that separates color modulation signals. The red signals R and Y for each horizontal scan are modulated by the cy-W filter I, and the blue signals are inverted for each horizontal scan by the e-W filter H, and are delayed by the horizontal period delay line 7. The output signal from the band P wave generator 6 and the output signal from the one horizontal period delay line 7 are cooled))g8 and r1. In addition to the detector 9, the adder 8 and subtraction; (J9 outputs a red signal R and a green signal B, respectively. These output signals are detected by detectors 10 and 11, and a low-frequency red signal 1< and a green signal are output. Next, in order to match the gain of the red signal ■ and the blue signal B according to the color temperature of the low-frequency signal for the color signal, the variable gain increase +l is applied.
The subtracters 14 and 15 provide color difference signals R-YL and B-YL, which are then sent to an encoder 16 along with a luminance signal Y to obtain a standard television signal.

What is the temperature of this color television camera? Compensation circuits/locks 17 to 22 (j4) are used to capture a white subject before pointing the color television camera toward the subject, and the color difference signals R-YL and B-YL output at this time are In other words, the comparison circuits 17 and 18 adjust the reference signal so that the color difference signals R-YL and B-YL become zero, and the output color difference No. 43 R-YL, B- Y. When photographing a white subject, switches 19 and 20 are closed, and the signals 1 and j obtained at this time are held in hold circuits 21 and 22. This held signal is External 1tfi oppression of variable gain amplifiers 12 and 13?-:+;
In addition to controlling the gain.

When switches 19 and 20 are closed, variable gain increase 1 [1
Mu Ii: 312 and 13, Sawakai: 4jY14 and 15, comparison circuits 17 and 18, switches 19 and 20. Hold circuit 2
1 and 22 form an I11 loop, which acts so that the color difference signals R-YL and B-YL become zero.

As soon as the color difference signal becomes zero, switches 19 and 20 are opened, the voltage is held by bold circuits 21 and 22, and the color 'l' is
, +i degrees are kept unchanged.

Is it necessary? It had the disadvantage that it could not be used continuously.

E) 'IJ notation/Removes this defect, always automatically adjusts color temperature, color L crystallinity t+fi lj'l device i:t'
(Iiif color television cameras have been known for a long time.The four examples are explained in detail with reference to FIG. The block is the same as that shown in , so its explanation will be omitted.

31 and 32 are color detection bi'IFs that detect different colors emitted by a light source, and 3 is a color temperature detector that obtains color temperature from the ratio of two different color signals detected by a color detector.
4 and 35 are color temperature compensators that generate gain control voltages for the variable gain amplifiers 12 and 13 for red and blue signals using signals output from the color temperature detector 33).

As seen in the spectral characteristic diagram based on color temperature shown in Figure 4, the color temperature of illumination varies at each wavelength. Therefore, the values of the red and blue signals added to the detection waves W lo and 11 change depending on the color temperature.

The reason for this is that, as shown in FIG. 5, the spectral characteristics of the red signal and the green signal change. The color temperature detector 33 is
Utilizing the property that spectral characteristics change when the color temperature changes, the color temperature represented by the ratio of the values of two colors is detected.

Therefore, the output ratio of variable gain amplifiers 12 and 13 is
From 3,200°K to 6000° as shown in J.
When it changes to K, it becomes 1/92nd at a red light and about twice as much at a green light. Here, the gain of variable gain amplifiers 12 and 13 with a height of 4.5000? U is color difference/l4. Increase the variable gain of the red light in order to make the + sign zero.:':+f r)
12 is approximately 0.75 times, the variable gain of the green signal j・:n'!
li+! ::ri 13ba15iSte° must be. Next, 6. To make the color difference signal zero when OOOo, increase the i+J variable gain of the red signal by adding
2 to 1.5 times, green light variable interest w increase] 1・ilf u
It must be multiplied by 3.075 times. Therefore, r,
As shown in Figure 36, the red light and i) signal uJ function 41 for one color temperature are obtained L1t ll'r;t i? + Do I have to change the gains of children 12 and 13? , l: 1. c run. The control voltage for changing this gain 2 is set to color temperature (L:
'6' (r 34 and 35 occur.

This color temperature t: 1 white', '(li'?i 34 and 35, red signal variable gain intensifier ll'iii 12 and ``1111
A control 715 pressure that controls the gain is applied to the variable gain amplifier 13 to compensate for color temperature.

This conventional color h' 41 degrees complementary i j 4 go l ;! : In a color television camera with an ili of 01゛i, in order to perform proper color temperature compensation, light having the same color temperature as the light illuminating the V'ε object must be incident on the color detector. Under conditions that violate this assumption, it would be difficult to perform positive color temperature compensation! (It becomes 1.

For example, if the subject is f4 = a person exposed to the light of the setting sun, the photographer should turn his back to the evening corner and take the closest shadow. However, most of the light that enters the color detector is still When the light comes from an unfaded blue sky, the color detector detects the color temperature of blue'')', so the color j'!LX ltl: Detector output B/R (here, B should be T The signal, R is a red signal) increases, and the variable gain of the green signal increases:) increase lf'l
It works to lower the gain of the A video signal and increase the gain of the red video video signal by 11%. Therefore, the color temperature control effect makes the blue video signal weak and the red video signal strong. ’1・“5
As a result, the person who is the subject appears to have an unusually reddish appearance on the display device or the like. Furthermore, when photographing the outdoors from indoors, the color detector of a color television camera is susceptible to light entering the room rather than light from the object outdoors.

Therefore, the color temperature detector outputs the color temperature of the indoor light, and does not compensate for the color temperature of the outdoor subject at 1:11, but only compensates for the color temperature of the indoor light by 1%.
1. When the subject has an unnatural color; ', there are drawbacks that can be shown.

That j;! [4 Near is the color l>2 output H1゛1 11 other than the camera lens system iNovember i:; υ〔
According to the American external sensor method, the light extraction area is wide) 11 degrees, so the light of the same color as the reflected light of the subject does not enter the color detector, and the correct color is detected. 7ii1
This is because 'j less than f + ii (・1 cannot be reduced to 1,000 f -).

Tsudaki's LI-like book is I! The color of the next color preview camera 1: 1321.20) 7 flaws)
This is a Y-erasing device that uses multiple pairs of color detectors placed in or behind the photographic lens to detect the color 1Mi' of the incident light from around the subject over a wide area and to detect the color of the incident light from around the subject. Distance setting a1. (When performing two-color 771M degree compensation, the color 7I1.lX1 viewing i+1i of a color television camera can be made even more positive color temperature compensation by using it as an element of value determination.
1i, 'j Elementary School 21' j ke 4 are aimed to be the same.

Structure of the Invention The present invention utilizes at least two or more color signals. A first means for controlling the IJ using control signals for each color signal;
a second means consisting of a plurality of pairs of detection means for detecting the color temperature of the incident light from a plurality of areas around the subject; a third means for detecting the distance setting value of the photographing lens;
Control for each color signal 1. is performed so that the gain of the color signal is optimized using the signals detected by the means and the third means. j
The fourth means for generating the signal is characterized by the color temperature of the television camera P (g supplementary 4:1 device 1).

The color temperature detector of the present invention can be used for 3-tube (plate) type, 2-tube (plate) type, and single-piece (plate) type color television cameras. , and a color test with multiple pairs of color temperature detection gaps/, tl
The number of illusions in the vessel can be increased or decreased as needed, and the number of illusions in the container can be increased or decreased as needed. J fl'+'ffl'7g<
The implementation can be changed as appropriate within the IP scope.

DESCRIPTION OF EMBODIMENTS The color temperature compensation L' of the color television camera of the present invention will be described below.
l'("J% Il', for the real IjW example of j, the seventh
Figures (a) to (e).

This will be explained in '5'('#ltl) with reference to Section 8, 1(a) to (11), and FIGS. 9, (a) to (g).

ITS 7 In FIGS. 7(a) and (e), one embodiment of the present invention is illustrated.

In Figure 7(a), l is the subject flower, 2 is fl
l) Image i'' no result y 1(ij, 36 haf(2p'j
L/ance, 31 and '32 are color detection F+rf.

The color detectors 31 and 32 detect light of blue and red wavelengths, but may also detect light of other wavelengths. The Hough diagram (b) is a perspective view showing the vicinity of the subject 1, the photographing lens 36, and the subject 1, as well as the background.
A view of this from the shooting GQ '91 side is shown in FIG. 7(C), and 37 is the image frame of tAa Den 't4' 2.

The color detectors 31 and 32 are arranged on the periphery behind and below the photographing lens 36. This kind of "Nifi"
Unlike the conventional external sensor method in which a color detector is placed in a housing other than the lens system of the camera, the color C incident through the (1) type lens 36 is Since the light is reflected from the subject itself, the color detectors 31 and 32
is the color of the reflected light from the subject itself; not only can the crystallinity be detected, but there is also a color detector 31 located around the rear of the photographic lens 36.
32, the light detection area is expanded and the color temperature of the surrounding light of the subject can also be detected. The photodetection areas are a portion 38 indicated by diagonal $j( in FIG. 7(a) and a portion 38 indicated by FIG. 7(C)).

As shown in FIG. 7(d), the reflected light of the object and its surrounding light detected by the color detectors 31 and 32 are converted into a 1E signal, which is added to the color temperature detector 33 to generate a color temperature signal. Output. This color temperature output signal is added to the color temperature compensation 1g934 and 35, and added to the variable gain amplifier 12 for the red signal and the variable gain amplifier 13 for the blue signal with a gain of UN, to perform an appropriate color temperature compensation 4i1.

Section 7 (e) shows an example in which a color detector is applied to a zoom lens system.

In FIG. 7(e), 36 is a focusing lens;
40 is a variator lens, 41 is a stopper lens, 42 is a focal lens, and 43 is a relay lens, and these lenses constitute a zoom lens system.

Focusing lens 361; t INi, i separation (1,1 function), variator lens 40 focuses
The compensator lens 41 corrects the vertical shift caused by the magnification history. The focal lens 42 corrects the distortion of the relay lens 43. Functionally, the relay lens 43 has the function of forming an image with a predetermined size and brightness on the final image (S+, image formation 1 of the image pickup tube 2) that enters through the lens system. 31 and 32 are color detection numbers 21, which are located between the focusing lens 36 and the variator lens 40, and are located between the focusing lens 36 and the variator lens 40;
It is located on the rear periphery of.

In such an arrangement, the focusing lens 36, which has the distance IE adjustment function, performs (
Since only the l'+'c angle moves, zooming is done at line 7:c and i:'; The photodetection areas i31 and 32 do not change.

Therefore, even in a zoom lens system, the ? By arranging the color detectors 31 and 32 on both sides and around them, it is possible to detect the reflected light from the subject passing through the focusing lens 36 and the surrounding light.

A circuit device that performs color temperature compensation using the signals detected by the color detectors 31 and 32. 'J.

Since it is sufficient to use exactly the same one as shown in FIG. 7(d), the explanation thereof will be omitted.

Other embodiments of the invention will be described below with reference to 8th IN(a)-(h).

In Fig. 8(a) and Fig. 8(b), 1 is the subject flower, 2 is the image pickup tube, and 36 is 1f? ! Shadow lenses, 31a and 32a, 31b and 32b, 31c and 32c, 31d and 3
2d is 4 pairs of color detectors, 171CQe lens 36
They are placed behind the t1i shadow lens 36 at different angles of 90° on the upper, lower, left and right sides of the t1i shadow lens 36. In FIG. 8(C), 37 indicates the image frame of the imaging plane of the image pickup tube 2, and the color detectors 31a, 32a, 31b pass through the photographing lens 36.
32b, 31c and 32c, and 31d and 32d are shown as lower area D (44a), upper area U (44b), left area L (44c), and right area J (44d). These four light detection areas cover the subject and its entire surroundings.

Therefore, the amount of light from the subject and its surroundings that falls on the light detection area that covers the subject and its surroundings is 4'11.
color detection 1:1; and its output signal is input to an evaluation calculation circuit 45 shown in 8 [', il (e), which will be described later.

In Section 8, Section 1(d), an actual example will be described in which, for example, a zoom lens system has a color sum of 4 N. The functions of the focusing lens 36, variator lens 40, offset lens 41, focal lens 42, and relay lens 43 have already been explained in FIG. 7(e), so their explanation will be omitted. Behind the focusing lens 36 and in 90° increments
Four pairs of color detectors 31a, 32a, 31 are arranged around the focusing lens 36 in the vertical and horizontal directions.
b and 32b-, 31c and 32c, 31d and 32d are 1-
Self: 11.

In f, i'581 support i (e), four phantom color detectors 31a and 32a, 311) and 32b, 31c and 3
The output signals of 2c, 31d and 32d are input to the switching circuit 46 of the evaluation judgment circuit 45, converted to digital signals by the AD converter 47, and input to the CPU 48.
After performing seven evaluation determinations, which will be described later, the 5/12 value determination signals are converted into analog quantities by the DA converter 49 and output to color temperature compensators 34 and 35. This output signal is applied to the red signal variable gain amplifier 12 and the blue signal variable gain amplifier 13 in FIG. 7(d) to perform appropriate color temperature compensation.

From FIG. 8(f) to at! 1(h), the color temperature values Dc, Uc, Lc, and Rc in the lower area U1, the left area U1, and the right area R are detected by four pairs of color detectors, and the color temperature values are determined. A flowchart for evaluating and determining the supplementary f71 signal will be explained.

In this evaluation judgment flowchart, if the power is on as shown, the color temperature signals Dc from the four pairs of color detectors are
, Uc, Lc, and Re, and sequentially performs the ratio 1Ii2 of two of these color temperature detection signals,
The output signal X of the comparison result (a total of 12 ratios + 112 results) is added to the color temperature N + compensation.

The principle of the evaluation judgment of this output (j number are all different, the output signal X is mi
d'l;'jj'4 Upper Since there is a high possibility that the light in the upper region U is achromatic, the color temperature complementary value? ; The signal applied to the input signal is the color temperature value Uc of the upper region U.

Referring again to FIG. 8(f) to FIG. 8(h), the color temperature output signals UC1DC, Lc, R from the four pairs of color detectors
Enter oke and enter MazuU. bird. If YES, then compare whether Uc and Lc are approximately equal or not. If YES, Uc and Rc are P.
a' Compare whether it is good or not, and if YES (that is, U(: DC, L(: Rc), the output signal X is X-
Let it be Uo1Dri + LC1R6/4.

If the comparison result of UC and Lc is NO, then Uc and 1
(If . is approximately equal to white, and YES (i.e., UczI)., U, JL. + UezRc)
The output signal X is set as
The output signal X is assumed to be X = Uo-)-Dc/2. Furthermore, if the result of the comparison between Uc and RC is NO (that is, UC"CI UC="C+UC≠Re"), the output signal X is set as X=U, +D, +L, /3.

If the comparison is made to see if Uc and DC are approximately equal or not, and the result is NO (that is, UczDc), then the comparison is made to see if Uc and Lc are approximately equal, and if YES, then U.

and R6 are approximately equal, and if Yl (that is, Uc≠DC, U,; Lc, LcMR□ output signal output X = Uc+Lc+R6/3).

If the comparison result between Uc and R6 is NO (i.e., Uc
≠DCsUc≠Lc), then U. ,! : Compare whether Rc is almost chicken-like or not, and if YES (that is, U
, ≠DC+UC: iLc, Uc; Rc), and the output signal X is assumed to be X = Uo-1-R6/2. Uc and R6
If the comparison result is NO (i.e., s UC≠DCt
UC phantom "Cs UC≠Rc) s output number 1j X is set as X=Uc+Lc/2.

Next, compare whether Dc and LC are almost equal or not.
If S (i.e., Uc4Dc, UctoLc
.

Ucf:, Rc, T)c:Lc), then Dc and R
Ratio of whether or not c is approximately equal Ii-me'7;i L YE
If S (i.e., Ucfnee Dc, Uc4
T, c, UcjRc, Dc; L+c, Dc
;Re), the output signal X is X=Dc+Lc+1 or c/3
shall be. Ratio of whether Dc and Lc are voluptuous or not 11hi ≧
If YES (i.e. Uc5Dc, U4
Lc4U4Rc, Dc;Lc, ), then I)
Compare whether c and Rc are 11 to I (,, YE
If S (that is, Uc≠Dc, , UcLc
, Uc$Re, ])c堝Lc, ,]'):;
R), υ1 force signal X is assumed to be X = Da + C Rc/2. J) If the comparison result of c and Rc is NO (i.e., UchoriDc, UcfLc, Uc
4Rc, Dc; Lc + Dcr Rc), and the output ID number X is X = DC + Lc/g\.

Compare whether Lc and Rc are true or not, and if YES (that is, UC# DC, Ucf Lc s' U
c% Rc.

DC≠LC, UcfRc, Lc;Re), and the output signal X is X-Lc-1-Re/2. And L
If the comparison result of c and Rc is No (i.e., U
c4Dc, Ucf:.

LC, UC#RC, Dc$Lc, Dcf,, Rc
, Lc≠Rc), and the output signal X is assumed to be X = Uc.

In this embodiment of the invention, four pairs of 1'Jj:
? By placing K near the rear of the photographic lens, the light detection area has been expanded, so the color temperature of the incident light from the subject and/or the surrounding area of the subject over a wide area can be detected even if there is a highly saturated subject. It can be detected without any color temperature and can be lit with appropriate color temperature compensation ()'.

Note that the present invention can detect the color fiu1 degree of incident light from the subject and/or the periphery of the subject by arranging the color detection Pif in or at the rear of the lens. By arranging the color detector around the rear of the photographic lens as described above, more appropriate color temperature can be detected.

Still another embodiment of the present invention will be described with reference to FIGS. 9(a) to 9(g).

In M'S 9 u (a), behind the focusing lens 36 of the zoom lens system, the angles are different by 90 degrees and 4 M (') are placed around the lens 3G.
Color test L [blank: if 31 a and 321, 311) and 3
'2b, 31c, 32C931d and 32d 6kii'
+: Do. Furthermore, color detectors 36a and 36b with I
j: J Lj', which is used as an external detection H7 for detecting the color temperature of light other than the light incident through the lens system. 1) From the outputs of the four pairs of color detectors mentioned in II, it is possible to obtain illuminance information by color temperature 1+'j :;・1. f'4 I Kade/J 31 a and 32
The signal @output at a is then added 1! The detection signals from the color detectors 31a and 32a are inputted to the l-i circuit S and the division circuit, and the detection signals from the color detectors 31a and 32a are added to the adder circuit S to obtain D, i.
W information is obtained, and in the division cycle M3D, the color temperature 11f information can be obtained from the ratio of the color detectors 31a and 32a. Illuminance from 36B and 36b is 11'j
I'm not looking for any information, I'm only looking for color temperature 'IIJ information, so 1.
] 4 sets of color detection H;
rt1 degree 1! ! J information and four sets of color temperature information 2 are obtained. Referring to Figure 91 (a) again in 11q, the focusing lens 36 focuses on a subject that is close to the camera from infinity, but the pressure information when it is focused is The distance information generator 48 generates the distance information. Short Boo, 6-point distance L! When photographing at a wide angle (L) or a telephoto side (long hot spot distance), focal length information is generated from the focal length information generator 49 by adjusting the variator lens 40 and compensator lens 41. The output signals from the four pairs of color detectors and the external detectors described above and the distance 1ζ from the distance information generator 48 are
For the IL clearing 11, the hot spot distance from the signal generator 49 (i point pressure 1ξ'i:, 1'i7) is input manually to the evaluation judgment circuit 45.Furthermore, the color television camera 46 (S) Manual 'l' when shooting in manual mode M, including the strobe lid information when shooting in 0-mode S and the color temperature setting knob provided on the housing of the color television camera. The i7 report and the information on whether the color television camera is in strobe mode S, manual mode, or, as will be explained later, in combination mode C, are sent to the evaluation judgment circuit 45. Input T.

A block diagram of the evaluation judgment circuit 45 to which the above-mentioned information !11 is input is shown in FIG. 2.S9 (C).

In the same figure, 13 is 1 (and B are red and blue filters, 31b and 321) L is the color temperature of the light in the upper area of the subject 1 (color detection:; 1f) 31d and 32d
Is the color of light in the right field J, ε1ce? Color detectors that detect rtif degrees, 31c and 32c are the left area J of the field
Color detectors 31a and 3211 detect the color temperature of the light Ljj L, and color detectors 3211 are color detection Hjl that detect the color temperature of the light in the lower region of the field.

Reference numerals 36a and 36b are external detectors which are provided in the housing of the color television camera other than the lens system, and which detect the color temperature of light other than the light incident through the lens system. The outputs from the color detector and the four pairs of color detectors are inputted to a switching circuit 41 via 1) a σ position amplifier; Furthermore, believe in distance,'! 3. Distance information from the generator 48 (・invasion, heat point distance +'!, fish resistance dance f+'7 information from the signal generator 49, and strobe mode °ii7
;”14 S and manual mode 'i';7'M
<M and the mode selection information M/S/C' that is input by the mode switching switch are input to the switching circuit 41. The above-mentioned information sequentially detected by the switching circuit 41 is converted into a digital fi
The signal is converted into an analog signal by a DA converter 44, and is inputted to an arithmetic circuit 43 to perform a judgment d and g, which will be described later.

FIG. 9(d) shows an arithmetic circuit 43 to which the various 1-1 reports described above are input. The information input to the arithmetic circuit 43 will be explained below. xl is external detector G
X2 is the output value of the color detector in the upper area U,
x3 is the output value of the color detector in the left area, x4 is the output value of the color detector in the right area, and x6 is the output value of the color detector in the lower area. The distance value to the object is compressed to a value between 0 and 1 by setting it to l when the object is at an infinite position.

F is the focal length information generated from the focal length information generator 49, and its output value is indicated by f, and in the case of wide, it is O;
By setting the combination of telephoto; B is the 1i·1 degree information obtained by adding and subtracting the outputs from the four pairs of color detectors, and the 11
4 (Electricity value is Lu, illuminance value of left area is LL, right area 1
The illuminance value below LR1 is indicated by LD.

M/S/ input after being switched to manual mode M, strobe mode S, or combination mode C.
The C mode trolley is indicated by W. In the case of manual mode 8.1, W=00, and in the case of strobe motor S, it is indicated by W.
= 01, and in the case of composite mode C, W = 1O and no compromise is made. K
is color temperature information manually selected and set using a color temperature setting dial provided on the casing of a color television camera, and its f value is indicated by k.

In FIG. 9(e), various 1-hour information marked fjiJ is input and color temperature: il! ? FIG. 2 shows a flow diagram for transmitting a signal to Y'J.

In the same figure, if the switch is on, various pieces of information marked Oσ are sequentially read through the switches in the arithmetic circuit. Loaded ↑j4 / S / C mode information W
It is determined whether W==00, that is, manual mode M. If YES, a calculation in manual mode M, which will be described later, is performed. Fuki and W are w=oi.

That is, it is determined whether the strobe mode is S or not, and Y
If it is ES, a calculation for strobe mode S, which will be described later, is performed. If the determination of W=01 is NO, W is naturally W=10.
Since this is composite mode C, operation n2 of composite mode C, which will be described later, is performed.

The arithmetic circuit shown in FIG. 9(e) is constructed to perform the calculation 3λ of the following arithmetic expression.

Its formula is: X = a X X X U. Determining the color temperature compensation signal in each mode using this equation by the arithmetic circuit will be explained below.

Note that X indicates a color temperature compensation signal, and i indicates a value that takes into consideration the outputs of the external detector G and four pairs of color detectors in a unified manner, or manual mode M and distance information X. , focal length information D, strobe mode - 100, and illuminance information B. Indicated by Note that the vector quantity is indicated above the letters by -aselfhinodo+'Jしでう'se.

Then, 1; I's 1π is a=(1-S'l, l-4Fz 1l-r311-f4
, 1-75).

j=1 Also, It is expressed as X=M'xAxB'xSx13.

The color temperature complementary value signal X in this example is expressed as: X = aIXI+a2 x2+a3 x3+a4 x
It is shown as a linear combination of 4+a5 x6 (1), and
a1 to a6 are coefficients. By changing the coefficients a1 to a in accordance with the various parameters, the color temperature signal XY is finally obtained.

Therefore, when formula (1) is expressed as a matrix calculation formula, it becomes as follows.

Here, 'i-(hfs h2+ JHh4H"5]
Letting s, it can be expressed as X: h X b (3).

Now, the external detectors (1 and 4 gradient color detectors U, L, R,
Since the output value of D, distance information ASS point distance information, illumination information 100, etc. are in mutually independent gatekeepers, the coefficient matrix l can be calculated from the calculation of h = a X A X F X B. . Here, a, A, 'P, and B are coefficient vectors formed according to the output of each color detector, object distance and shadow, focus resistance, and illuminance, respectively. Furthermore, the coefficient vector 100 for the strobe mode and the coefficient vector M for the manual mode are also vector-multiplied.

Therefore, ■ is h -a X A X F X B X S X M
(4) becomes.

In equation (4), if we set X=MxAxFXSXB, X = a X X X b (5) It can be expressed as

J=1 gfi! represents the degree of abnormality of the color detector output xi;
If there is no level difference between the two, the result is O.

Therefore, other color effects H except for the output value xi of the color detector
, ;, for all values of the output value Xj of 3 (N-
It represents the degree of abnormality of the output value Xi of the color detector during 1). Therefore, it indicates the degree of abnormality of the output value Xi of the color detector. Therefore, the above i vector is a= (1-gt, 1-g2*1-g311-g4,1
-g5), the coefficient of the output value x1 of the color detector with a high degree of abnormality approaches 0, and conversely, the coefficient of the output value x1 of the external detector q and the four pairs of color detectors approaches 0. When x6 is equal; the a vector becomes a=(x, t, t, t, t:].

In this way, the vector i is used to compare the output value levels of the external detector (l) and the four pairs of color detectors, and in particular, based on the principle of majority voting, the weight of the output value level of the abnormal detector is reduced. It is a useless vector.

Next, the distance information 1 to the subject (ii't to 1ii5
If the subject is very close or fJ,L),
As mentioned above, it is t-〇, so if we substitute this, we get
And if the distance to the subject is infinite, then
/1. = 1, so by substituting this, this means that the closer the distance to the object to be photographed, the greater the weight of the output of the external detector () and the color detector in the upper area j < U. increases, and the distance to the subject li′! lE becomes infinite)
This means that the weights of the output values of the color detectors in the left area Ji, QL and the right area R are increased.

A is a vector for performing weighting according to the concealment of the distance to the subject in this way.

Next, when the output value of the fish-proof heavy-duty information device is on the wide side according to the value f from wide t)u to the play side, as mentioned above, when it is on the wide side, it is f-〇, so by substituting this, we can get the value on the tele side. Since (=l, substituting this value, this means that the fish weight resistance Ei'J'J'Fj, F approaches the wide side < fl + i, external - (・(out); and the output of the color detector of the upper tit 2 LU.
1 approaches 0, and the weights of the four pairs of color detector outputs of the left region, right region 1, upper region U, and lower region U become uniform, and are averaged. It means to do something.

In this way, focal pressure information p is ::! <Point IR1: '6
This is a vector that must be determined according to .

Next, illuminance j'r'f output of signal B j+'j Lu
From , Ll, , LR, LD, the ratio of the brightness of the upper region U is expressed by this vector. If the illuminance value ■ and U are at an intermediate level, the output values of the color detectors in the left and right areas are emphasized. However, when jj and i electric value Lu become smaller, upper area U, left area L, and right area 1 become smaller.
The output of the color detector in the lower region v2D (ll'1n4i,j
9. It is a vector that performs eight miscellaneous operations and contributes according to the illuminance from the subject.

Next, manual mode Δ1 and strobe mode S.

The calculation process for obtaining the color temperature signal Xg in the combination mode C will be explained.

Regarding performance 3 of manual mode M.

The price is set by a color temperature setting dial provided on the casing of the color television camera. and,
The formula for calculating the color temperature complementary value signal is expressed as X = a X or × 100 by formula (3) written as 1'J1.

Here, since X is expressed as
Substituting into the above formula (3), X = a X M Xτ
×FXSXBXb. Since the value of the color temperature set manually is k, a diagonal matrix of manual mode M is formed.Next, the {circle around (1)} vector and the r vector are shaped as follows. Next, distance information X, focal length '1
7/! tf >, I-0 fl'+"1'lJ 亙, I'!i:f lff1 'I'F? fig B
(1) T)! form j ri, kl, a,
1) Perform matrix calculations of , A, I', 100, and ■ to determine X=k, and output this as a color temperature compensation signal.

Regarding strobe mode S calculations.

As in manual mode M, X = a x
Vector multiplication of MxAxDing Distance information
Form a matrix with. And S, a, +3, A,
, F, M.

-13 matrix multiplication is performed on one row r'' to obtain X-C, which is output as a signal of color humidity IQy complement I't'.

Regarding i'ji calculation in compound mode C.

Distance r, f (fi7 report A) Fl, j j'1ll (diagonal ma using 4 direct t'i) IJ Kusugi form JM, t
7).

Also, a diagonal matrix is formed using the focal length value f of the focal length information F.

And Teru W 'ir'? Information H's direct "u I "L
, "R+"D Y, form a diagonal matrix from the A direct of J.

Since strobe mode S and manual mode M are not used, a diagonal matrix of is formed. And X-a ×M
A color temperature compensation signal is output by performing matrix multiplication of X A X F

In addition, in compound mode C, the distance is 19↑X! The distance value t of the information A, the focal length information F, and Jr
To explain the calculation process to obtain
Using distance value t of information A, form a diagonal matrix of i'+.

Next, focal length self 11'l''; ff F + illuminance information B,
Since manual mode information 4++IM and strobe mode information S are 117 pieces of information that are not used, a diagonal matrix of is created.

Sosite, X = a X M X A X F X S
X B X b matrix power ↓V Y 'I':T
Thus, a color temperature compensation signal X is output.

In this way, manual mode M, strobe mode S
The output X obtained for and composite mode C is the color temperature compensation f
Although it is a Li signal, the output X is i, J (not shown).
It is used after the gain and offset of the amplification control system are adjusted by the IS so that it falls within a predetermined range.

In FIG. 9(f), the external detector G'? Except for the 4 pairs of color detectors, the distance ppo information A %
color temperature compensation signal 7 using other parameters such as
A flowchart of another example is shown.

If it is determined in step ■ that the power is on,
In step (3), input information is read by scanning the switch. If it is determined in step (2) that the mode is manual mode FM, the color temperature setting value of the nine color temperature setting dials provided on the housing of the color television camera is output in step (2). If it is determined that the manual mode is not M, it is determined in step (2) whether the strobe mode is S or not, and if it is the strobe mode S, the color temperature value of the strobe to be used is output in step (2). In step (2), it is determined whether the illuminance value Lu of the upper region U obtained by adding the outputs from the pair of color detectors of the upper region U is larger than a predetermined value LM, and the LLI >LM, in step (2), emphasis is placed on the outputs Lc and Rc of the color detector in the left region and the right region t16; and R, and X-Lc+Rc/2 is output. Lu ) When not LM, step ■
When the distance to the subject is known at , and it is determined that the distance r4L A is larger than the preset distance m, the color detectors in the left area and right area I are
Emphasizes the output of X == L, outputs 10Rc/2. After that, in step ■, the distance to the subject geE
It is determined whether t is smaller than the preset distance 1111itm, and when t<bn, emphasis is placed on the appearance of the color detector in the upper region U, and in step
'Output 4.

Note that the magnitude relationship between the preset value Ay and 1 m is tu > tm.

1 (If not tm, in step [phase],
The value f of the fish weight PIG information F is the preset value fM
If f>fM, in step O, the average value of the outputs of the four pairs of color detectors is determined.
I) Output c + Uc + +Rc/4. If f>fM, it is determined in step 0 whether the focal length is smaller than a preset focal length value fm, and f
(In the case of fm, the output of the color detector in the upper region U is
Output as c. If f<fm, then in step 0, it is determined whether the output values of the color detectors in the upper area U, right area R1, left area L, and lower area are approximately equal. outputs X=DC+Uc+Lc+I axis/4.

If they are not substantially equal, that is, in step [phase], if the output values of the color detectors in the upper area U, right area R1, left area L, and lower area are not equal to each other, the upper area The output of the U color detector is output as X=Uc, and if not, the average value of the outputs of the four pairs of color detectors, X-Dc+Uc+Lc+Rc/4, is output.

After the value of X to be output as the color temperature compensation signal has been calculated in this way, the process returns to step (2) and this loop is repeated.

In addition, J
An explanation of the flowchart for making 1-shin porridge is shown in Figure 9 (
Explain with reference to 'g).

If it is determined in step ■ that the power is on,
In step (2), the manual input information is read by scanning the switch. If it is determined in step (2) that the mode is manual mode λi, the color temperature setting value of the color temperature setting dial provided on the casing of the color television camera is output in step (2). Manual mode M
If it is determined that it is not, it is determined in step (2) whether or not the strobe mode S is set, and if it is the strobe mode S, the color temperature value of the strobe to be used is outputted in step (2). In step (2), when the distance to the subject is known and it is determined that the distance I L is greater than the preset distance tM, the color detection between the left area and the right area R is performed in step (2). Output of the device 1 (
and outputs X=LC c/2.

After that, in step 2, it is determined whether the distance 14'L to the subject is smaller than the preset distance, and if 1<, the output of the color detector in the upper region U is emphasized, and in step Q, = Output Uc. The magnitude relationship between the preset values AM and tm described above is as follows:
ty > Am.

L (If it is not tm, in step 0, it is determined whether the output values of the color detectors of the upper region U, right region R1, left lower region L, and lower region are approximately equal. In the case, at step 0, X= DC+U, +Lo+
Output R,/4. If they are not equal, the output of the color detector of the upper region U is output as X=UC in step 0, otherwise,
Average value of output of paired color detectors X = DC 10U. +Lc
+Rc/4 is output.

After the value of X to be output as the color temperature compensation signal has been calculated in this manner, the process returns to step (2) and this loop is repeated.

In addition, when shooting in automatic tracking mode with the white balance adjusted continuously and automatically, the color temperature of the light illuminating the subject is detected and the color temperature is quickly and automatically adjusted.
i11 smells! If! I 1.1l17 must do 11
2. For this reason, depending on the usage conditions of the color television camera and the 411 shadow object, 1 (pair color detection h
In addition to the value detected by ri, hM,'+ :j'i
f setting 41'l, focal length i'ii# setting value, illuminance value, outside f'' detector. It is necessary to set the weight standard for the parameter values such as color temperature, etc., by conducting an official review.

In addition, in a television camera with a small number of control parameters 17τ]
+i's most used 'JJI degree's 27. It is necessary to set the value -171 and the mulberry fire to match the attack with the attack 1.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a multi-gas lens is provided in or behind the 5LS lens of a color television camera.
By placing a color detector]・11, the color temperature of the incident light from the subject and/or multiple areas around the subject can be determined. This makes it possible to perform appropriate color temperature compensation based on the highly saturated shadow of the subject, and also to adjust the setting value for the distance from the subject to f and de. By setting the evaluation judgment to be purple when performing compensation for color temperature 111, more appropriate color temperature compensation can be performed.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a color temperature corrector for a conventional color television camera, Figure 2 is a block diagram of a color filter, and Figure 3 is a block diagram of a color temperature corrector for a conventional color television camera.
The figure shows block diagram 1 of a color temperature corrector of another conventional color television camera, Figure 4 is a spectral energy distribution curve diagram, and Figure 5 is a spectral characteristic diagram of red and blue signals according to color temperature signals.
Figure 6 shows gain correction h1' for red and blue signals depending on color temperature. The figures shown in FIG. 7(a) to FIG. 7(e) explain one embodiment of the present invention, and FIG. 7(a) is a side sectional view of a subject and main parts of a color television camera. , as shown in Figure 7(b)
is a perspective view of what is shown in 7th 1(a), FIG.
) is a diagram of the subject and its surroundings t'tll viewed from the tG tube side, 71st-1(d) is a block diagram of the color r7+a detection circuit, and Figure 7(e) is a color detection circuit for the zoom lens system. Figures 8(a) to 8(f) show the head view of the vessel with the vessels arranged.
) is for explaining another embodiment of the present invention, and FIG.
) is a side sectional view of the subject and the main parts of the color television camera, FIG. 8(b) is a perspective view of the object shown in FIG. 8(a), and FIG. 8(c) is the subject and its surroundings. Figure 8(d) is a cross-sectional view of a zoom lens system with four pairs of color detectors, and Figure 8(e) is a color temperature diagram including an evaluation judgment circuit. The block diagram of the signal detection circuit is shown in FIGS. 8(f) to 8(!), which shows the evaluation judgment flowchart for obtaining the color temperature compensation (j'i signal, and FIG. 9(a)).
9(f) show still another embodiment of the present invention. FIG. 9(,) is a side view of an embodiment in which four pairs of color detectors are arranged in a zoom lens system, and FIG. b) is a circuit block diagram that calculates color temperature and illuminance from the output from the color detector, Figure 9 (
c) is a circuit block diagram of the embodiment shown in FIG. 9(a), FIG. 9(d) is a circuit diagram where various parameters are input, and FIG. 9(e) is a circuit diagram of the embodiment shown in FIG. 9(a). Flow diagram of mode S and pitching mode C, No. 9
Figure (f) is a flow diagram for outputting a color temperature compensation signal using another method, and Figure 9 (ri) is a flow diagram for distance setting (l/I biparameter). Figure 9 (c) In, 31a and 31b, 31b and 32
b, 31c and 32c, 31d and 32d are four pairs of color detectors, 36a and 36b are external color detectors, 41 is a switching circuit, 42 is an AD conversion circuit, 43 is an arithmetic circuit,
44 is a DA conversion circuit, 45 is an evaluation judgment circuit, 48 is a distance signal generator, 49 is a focal ratio 111 [signal generator, S is strobe mode, M is manual mode M/S/
C indicates a mode changeover switch. Patent applicant: Canon Co., Ltd. Figure 7 (t2) 32'

Claims (3)

[Claims] (1) A first means for controlling the gains of at least two or more color signals using control signals for each color signal, and incidence from a subject placed in or behind the photographic lens and/or a plurality of areas around the subject. a second means consisting of a plurality of pairs of detection means for detecting the color temperature of light; a third means for detecting the distance setting value of the photographing lens; A color temperature compensation device for a color television camera, comprising a fourth means for generating the control signal for each color signal using the signal so that the gain of the color signal is optimized. (2) A color television camera according to claim 1, characterized in that the second means consisting of the plurality of pairs of detection means described above is arranged in or behind a photographing lens of a zoom lens system. Color temperature compensation device. (3) The color temperature compensating device for a color television camera according to claim 2, wherein the second means consisting of the plurality of pairs of detecting means described above consists of only four pairs of detecting means.