JPH065886B2 - Image reader - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image reading apparatus for reading a film image, and more particularly to an apparatus capable of reading both negative and positive films.

<Prior Art> Conventionally, an electrophotographic copying machine was considered as an apparatus of this type. Generally, there is a significant difference in gradation between photographic film and general manuscript, especially in the case of color. Further, it is impossible to completely linearly attenuate the light quantity vs. surface potential of the photosensitive drum used in the electrophotographic system and cover the entire area with respect to the incident image light. Therefore, in general, in the case of color, the method of selecting image forming conditions with good reproducibility depending on the original image was taken, but it is difficult to fix the condition setting because the photosensitive drum exceeds the characteristic fluctuation under environmental conditions. Gradation correction and the like in the case of the above-mentioned photographic film and general manuscript could not be easily performed.

Further, due to the difference in the characteristics of the film itself, it is difficult to compensate the characteristics of the negative and positive films even when electrically read.

Further, when an image signal is obtained from such a film, the image data can be obtained at a higher speed by using a line sensor for reading. A technique for performing shading correction when using such a line sensor is known.

However, since the optical characteristics differ depending on whether the film is negative or positive, if the shading correction state is optimally set when the film is negative, the quality of the image finally obtained will deteriorate if the film is positive.

<Purpose> In view of this point, the present invention has an object to provide an apparatus capable of obtaining a good read image signal in both the negative and positive cases.

<Embodiment> (Outline of Apparatus Mechanism) FIG. 1 is a perspective view of a digital color image forming apparatus 100 according to an embodiment of the present invention, and FIG. 2 is a configuration diagram schematically showing FIG. The configuration of the present invention will be described with reference to FIGS. 1 and 2. The document table glass 1 has a document 20 placed on a flat surface. The original surface of the original 20 faces the surface of the original glass 1, and the original 20 is pressed by the pressure plate 1a. A reading head (hereinafter referred to as a reader) 3 for reading the document 20 has three colors of red, green, and blue (hereinafter referred to as R, G, B).
A reading sensor (hereinafter referred to as a CCD unit) 17 composed of a CCD array that sounds from a plurality of reading blocks in each row and an exposure lamp 19 are mounted, and the main scanning wire 8a is connected to and driven by the main scanning motor 6a. The sub-scanning table 5a supports one end of the main scanning wire 8a, and is connected to and driven by the sub-scanning motor 9a by the sub-scanning wire 10a.

The recording paper 21 is placed on the recording base 2 and a copied image is recorded by a recording head (hereinafter, printer) 4. Pudding 4 includes yellow, magenta, cyan, and black (hereinafter YM.
C. BK) A recording element (hereinafter, BJ head unit) 18 which sounds from a multi-inkjet head for four colors (hereinafter, since a bubble jet head is used in the present invention, the BJ head hereinafter) 18
Is mounted, and the main scanning motor 6 is driven by the main scanning wire 8b.
It is coupled to b and driven. The sub-scanning table 5b supports one end of the main scanning wire 8b, and is connected to and driven by the sub-scanning motor 9b by the sub-scanning wire 10b.

In the above-mentioned structure, when trying to obtain a copied image, the reader 3 moves the main scanning motor 6a through the main scanning wire 8a.
And is reciprocated in the main scanning direction. At this time, the exposure lamp 19 is turned on and the reading sensor 17 reads the document 20 from below and outputs image information as an electric signal. Based on this electric signal, the printer 4 is driven by the main scanning motor 6b via the main scanning wire 8b, and prints on the recording paper 21 while reciprocating. At this time, the main scanning directions of the reading head 3 and the recording head 4 are set to be opposite to each other in this embodiment. After one copy process in the main scanning direction is completed and the exposure lamp 19 is turned off, the reader 3
The printer 4 moves in the direction perpendicular to the main scanning, that is, in the sub-scanning direction to the position where the next main scanning is performed. At this time, the reader 3 has the sub-scanning base 5a supporting the main scanning wire 8a.
Along with the sub-scanning wire 10a, the sub-scanning motor 9
It is driven by a and moves to a predetermined position and stops. Further, the printer 4 is driven by the sub-scanning motor 9b via the sub-scanning wire 10b together with the sub-scanning table 5b supporting the main scanning wire 8b to move to a predetermined position and stop.

(Device control operation ... Pre-operation) FIG. 3 shows a block diagram of the control circuit of the above-described embodiment, FIG. 4 shows a timing chart of the entire sequence, and FIG. 5 shows a program flow chart. 4 and 5,
First, the outline of the operation of the apparatus will be described with reference to FIG. In addition, step No. on the timing chart and flow chart.
Are the same.

Sequence cotton roller 23, image controller 2
Both 4 have a microcomputer unit in the center,
The sequence control of the apparatus and the timing of image data formation are programmed respectively, and both microcomputers communicate data via line 39.
The sequence after the power is turned on will be described. The sequence controller 23 initializes the copying machine in step 1 according to the flowchart of FIG.
Return to home position for main scanning and sub scanning of reader and printer. Next, in step 3, the recovery operation of the inkjet head is performed. The head recovery operation is performed in order to forcibly remove the ink adherence at the ink jet nozzle tip after the apparatus has been idle for a long time, and further to remove the liquid pool near the nozzle tip after the ink ejection operation. This is an operation performed by pressing a material having good water absorbability against the tip of the head or sliding it in contact with it. Sequentially, the printer main scanning motor 6b is rotated in the backward direction and stopped by the detection output of the recovery system position sensor 22. Next, a drive mechanism such as a solenoid for pressing the porous member against the head is turned on, and the nozzle tip is pressed for a predetermined time. After completion, the printer main scanning motor 7b is rotated in the forward direction and stopped by the detection output of the printer main scanning home position sensor 12.

Next, in step 4, the head is capped for the purpose of preventing a change in the viscosity of the ink at the nozzle tip during a pause before the copying operation of the apparatus. This is achieved by turning on a drive mechanism such as a solenoid that applies a cap at the home position of the printer. Next, in step 5, the operator's input from the operation unit 25 is awaited, the input data is decoded, the copy mode is set, and in step 6, it is judged whether or not a copy start command is issued. If the process returns to step 5 and the copy is started, the process proceeds to step 7 and the cap drive of the head is released to start the copy operation. Next, the process proceeds to step 8 and the head idle discharge process is performed prior to the copy operation. The idle discharge process is a process that is performed to perform stable recording, and a copy pause time is provided to prevent uneven discharge at the start of discharge for image formation caused by a change in the viscosity of the ink remaining in the inkjet nozzles. , The temperature inside the apparatus (a temperature sensor is not shown), and the operation of ejecting and removing the ink inside the inkjet nozzle according to programmed conditions such as copying duration. Next, in step 9, the original exposure lamp 19 is turned on and shading correction processing is performed. The shading correction is to read a standard white plate serving as a reference of white data before scanning a document, and sample the correction data of the aberration of the optical system lens and the sensitivity variation of each bit of the CCD sensor.

Next, the process proceeds to step 10, and it is determined whether or not it is immediately after the start of copying. Immediately after the start, that is, before the start of the first main scanning, the process proceeds to step 11, and if it is the second or later, the process proceeds to step 12. In step 11, the head recovery operation is performed on the assumption that the apparatus will be idle for a long time. The recovery operation in this case is the same as the operation described in step 3. Next, the process proceeds to step 12 to start main scanning. (Note that each signal is shown in FIG. 6) (Device control operation-copy) In the main scanning, first, the motor driver circuit 26a of the reader via the line 40 is supplied with speed data according to the magnification and rotation start signal in the reader forward direction. To turn on the reader main scanning motor 6a. Next, after taking the delay time for synchronizing the reader and printer according to the scaling ratio,
A rotation start signal in the printer forward direction is sent to the motor driver circuit 26b of the printer via the switch to turn on the printer main scanning motor 6b. Regarding the rotational speeds of the main scanning motors 6a and 6b of the reader and printer, the pulses (FG signals) from the rotational speed detecting rotary encoders 7a and 7b (hereinafter referred to as encoders) are motor driver circuits 26a and 26b, respectively.
Is compared with the rotation speed reference pulse and locked to a predetermined rotation speed by PLL control, and the rotation speed becomes constant. Further, each encoder pulse is sent to the video data synchronizing signal generating circuit 28 and the head data synchronizing signal generating circuit 38 via the lines 42 and 43.

(Processing by Reader) Next, in step 13, a copying operation is performed. Hereinafter, description will be made with reference to FIGS. 7-e and 7-b. As shown in FIG. 3, the video data synchronization signal generation circuit 28 is position information in the reader main scanning direction in synchronization with the encoder pulse of the reader main scanning motor 6a and has a resolution l in the sub scanning direction.
A video line enable signal (hereinafter referred to as VLE) indicating the effective range of the video data is generated as shown in FIGS. 6-a and 6-b. Furthermore, the video data start signal input from the CCD drive circuit 29 indicates the data effective width of all pixels of the CCD and outputs a video data enable signal (VDE) synchronized with the encoder pulse. At the same time, the CCD driving circuit 29 has three rows of blue (B), green (G), and let (R) 3 on the CCD unit 17, respectively.
A CCD start signal for instructing an image reading to the CCD corresponding to the color is synchronized with the encoder pulse and supplied through the line 57. The analog video signals for the three colors read in the CCD unit 17 are gain-adjusted so that the sensor sensitivities of the respective colors are equal, and then output as digital values having a depth of 8 bits through the line 44. At this time, a video data start signal indicating the effective data range of all CCD pixels is also output from the CCD drive circuit 29. Digital video data of B, G, and R colors (hereinafter referred to as video data) is input to the reader synchronization circuit 30.

The video synchronizing signal generating circuit 58 will be described below. To the video synchronizing signal generating circuit 28, the signal PHREGP line 45 from the leader registration position sensor 15 is sent.
V. L. E. V. signals are counted from line 46 and image controller 24 according to the copy magnification. L.
E. The signal values are input via line 47, respectively, and the leader registration position for image registration is CC-registered.
After passing through the D unit, the time delay until reaching the leading edge of the document, that is, the reading start position is V.D. L. E. This is done by counting the signals. Further, a signal video enable signal (hereinafter referred to as VE signal) indicating the reading width in the main scanning direction according to the copy size is output and input to the reader synchronization circuit 30 via the line 48.

In the reader synchronization circuit 30, as shown in FIG.
When the same portion of the original document of the CCD corresponding to each of G and R colors is read, the alignment operation in the main scanning direction is performed. That is, assuming that the intervals of the CCDs corresponding to B, G, and R colors are L1, respectively, the image at the position S1 of the document is input to the CCD corresponding to each color when the main scanning speed is V and the time is L1 / V, respectively. I have a gap. Therefore, until the image of point S1 is input to the CCD of R that is input after the time, the C of B and G is input.
The video data from the CD is temporarily stored in the buffer memory in the reader synchronization circuit 30 respectively, and the B, G, and
The R3 color video data is collected and output from the reader synchronization circuit 30. In addition, V. E. A signal is input, that is, a video data area (VDA) signal indicating a state in which video data of B, G, and R three colors are gathered after the video data of the original is input is output. The vertical direction in FIG. 6-c is the time axis, not the sub-scanning direction.

The video data color-matched by the reader synchronization circuit is then input to the scaling buffer memory 31 and scaled.

(Scaling Process) Here, the scaling process will be described with reference to FIG. The scaling processing in the main scanning direction is performed by changing the scanning speed V1 of the printer to V1 / n while keeping the scanning speed V1 of the printer constant (n is a scaling ratio). This is because the upper limit of the drive frequency of the inkjet head that is the image forming means of the printer is lower than the upper limit of the drive frequency of the CCD. Therefore, at the time of normal copying, the maximum ink jet drive frequency is used at the same magnification in order to increase the copying speed. At this time, line 4 in FIG. 3
9, a scaling mode signal is sent from the image controller 24 to the video data synchronizing signal generating circuit 28, and the V.V.
L. E. The frequency division ratio of the motor encoder pulse of the reader is set so that the signal has a common frequency at the time of equal magnification and at the time of magnification change (Figs. 7-a and 7-b).

That is, as shown in FIG. 7-a, the motor encoder pulse φ _M
Is 1/6, and is divided into 1/6 as shown in φ _M1
When it is doubled, it is divided into 1/12 as shown by φ _M 1/2, when it is doubled, it is divided into 1/3 as shown by φ _M2 , and when it is tripled, it is 1/2 Divide into. The motor encode pulse φ _M is 2 when the frequency is 1/2 times the same size.
Since it is twice as much as 1/2 and twice as much as 1/3, the frequencies of φ _M1 , φ _M2 , φ _M3 , and φ _M 1/2 are actually the same frequency.

FIG. 7-b shows the reading position on the original, and shows the moving distance of the CCD during a fixed time t (= V.LE section). When it is reduced to 1/2, it has a movement distance twice as large as the normal size, and when it is doubled, it is 1/2 as large as the normal size.
Moving.

Further, the scaling processing in the sub-scanning direction is performed by the video clock φ (CL
R8 transmitted from the reader synchronization circuit 30 in synchronization with K8). G. This is performed by controlling the address step of the scaling buffer memory 31 when each pixel of the B video signal is stored in the scaling buffer memory 31 (FIG. 7-c).

This is achieved by increasing or decreasing the number of clock pulses of the address counter when the scaling mode signal is input from the image controller 24 to the memory control circuit 32 through the line 50 and written in the scaling buffer memory 31 according to the scaling ratio. (Fig. 7-d). As a result, the data of the same pixel is written to n addresses in the memory 59b in the write mode (W) of the double buffer memories 59a and 59b in the variable-magnification buffer memory 31 when enlarged by n times.
In the case of / n reduction, one pixel out of n pixels is written in one address, and when in the read mode, if the address is stepped up by the video clock φ-CLK8, pixel data is interpolated and thinned out. Will be achieved. Although the motor speed on the reading side is changed in this embodiment, the motor speed on the recording side may be changed.

Here, another function of the scaling buffer memory 31 will be described with reference to FIG. 7-d. Scale buffer memory 3
The double buffer memories 59a and 59b in 1 switch the address stepping clock between writing and reading. L. E. Since the signal is generated from the encoder pulse of the reader main scanning motor 6a, when the rotation unevenness of the motor occurs, the accuracy as position information between the main scannings in the entire sub-scanning is obtained, but the frequency becomes uneven.
V. L. E. In order to synchronize with the signal and not to change the accumulation time of the CCD, the image reading cycle by the CCD is set to V. L. E. Since the shift clock φ-CLK4 of the CCD 17 has a frequency more than twice as high as the video clock φ-CLK8, the shift clock φ-CLK4 of the CCD 17 is set to ½ or less of the minimum value of the signal cycle. The shift clock φ-CLK4 of the CCD 17 is used as the address clock of the video clock φ, which is a synchronizing signal of pixel data in the reader / printer at the time of reading.
-CLK8 is used.

As described above, the scaling buffer memory 31 and the memory control circuit 32 interpolate pixel data in the sub-scanning direction in the scaling mode.
In addition to the thinning-out operation, the CCD reading time is fixed and the pixel reading operation is performed in synchronization with the encoder pulse of the reader main scanning motor 6a.

(Image signal processing) In the scaling buffer memory 31, the B, G, and R three-color video data subjected to the scaling processing described above is next processed by the image processing circuit 3.
3 and the processing shown in the block of FIG. 8 is performed. First, the R, G, and B color video data are corrected by the shading correction unit 60 based on the data of the standard white plate read in step 9. In this embodiment, CC
Since the image light is read within the range in which the D exposure amount E and the light output voltage V maintain the linearity, the correction of the following equation is added.

However, Vs: output after shading correction V: output from CCD Vmax: output when a white plate is read Vsmax: set output The video data with shading correction added is input to the next logarithmic conversion unit 61 from the light amount value. At the same time as conversion to ink density values, complementary color conversion is performed, and B, G, and R video data are converted to y, m, and c density data, respectively. The conversion formula is expressed by the following formula, where D is the ink density, Ep is the standard white plate reflection light amount, and E is the image light amount.

The three-color density data after conversion is next subjected to the black extraction / UCR unit 62.
And the edge extraction unit 63. What is black extraction?
That is, the amount of black ink hit is calculated from the density data of three colors M and C. This is because if you try to express black (hereinafter Bk) with Y, M, and C color inks, it will be difficult to express perfect black, and the amount of ink ejected will increase, causing "bleeding" and excess paper on the copy paper. This is to prevent the expansion of. UCR (removal of undercolor) is a method of reducing the ink amount of each color of Y, M, and C in relation to the black ink amount when black ink is used by black extraction. In the present embodiment, the calculation of the following equation is performed. .

_{Bk = {min (Y, M} , C) -a 1} a 2 Yout = (Y-a 3 Bk) a 4 Mout = (M-a 5 Bk) a 6 Cour = (C-a 7 Bk) a 8 However, a _{1 to} a ₈ are arbitrary coefficients. Edge extraction enhances the contour of an image by adding the edge amount extracted by extracting edges and lines of the image to the original image data with a specific relationship. This is to try. In this embodiment, edges are extracted using a 5 × 5 convolution mask in the main scanning and sub scanning directions. In order to remove the noise component from the extracted edge amount, an arbitrary threshold is selected so that the low-level detected value is not added to the image data. Further, the edge extraction unit outputs a video data valid signal (hereinafter, V.D.V. signal) indicating a region where the edge can be extracted by the Laplacian mask in the video enabled state. This means that when using a 5 × 5 Laplacian mask, V.
E. After the signal becomes active, the third V.
L. E. Signal to V. D. V. Indicates that a signal is output.

Concentration data after UCR Y. M. C is input to the masking section 64 and masked. For masking, the following calculation is performed by a matrix calculation process for correcting turbidity when ink is superposed due to unnecessary absorption of ink.

_However, a 11 _{~a 33} is the number of any system.

Next, the masked Y, M, C three colors and the Bk density data are input to the output gradation correction circuit 65, and the data of the latter 2
Correction can be added to flatten the gradation in the pseudo halftone expression by the dither method used in the binarization circuit. The correction formula is shown below.

Yout = {a ₅₁ (Y−a ₅₂ )} a ₅₃ Mout = {a ₅₄ (M−a ₅₅ )} a ₅₆ Cout = {a ₅₇ (C−a ₅₈ )} a ₅₉ However, a _{51 to} a ₅₉ are optional. Is the coefficient of.

Next, output tone-corrected density data, Y, M, C, B
The k and the edge amount ED are input to the binarization unit 66 and binarized.

In the binarization process, the image data is first binarized uniformly using the systematic dither method in this embodiment, and then the target pixel is corrected by the edge data ED. That is, 8-b
When correction is performed based on the truth table shown in the figure, the image in which blurring has occurred at the edge portion by the systematic dither method becomes a pseudo halftone expression image in which the contour is strengthened.

The video signal processed by the image processing circuit 33 as described above and converted into a binary signal of Y, M, C, Bk and four colors (hereinafter referred to as density data) for the inkjet head is read by the reader / reader.
Input to the printer synchronization memory 34 via line 51.

(Processing on Printer Side) Here, the head data synchronizing signal generating circuit 37 will be described before the operation of the reader / printer synchronizing memory 34 is described. In the head data synchronization signal generation circuit 37, the sixth
-D, 6-e as shown in the printer main scanning motor 6
In synchronization with the encoder pulse of b, a nozzle line enable signal (hereinafter referred to as NLE), which is position information in the main scanning direction of the reader and which indicates the effective range of head data of resolution 1 in the sub scanning direction, is generated. N. L. E. The signal is sent to the head synchronizing signal generating circuit 38 through the line 52.
A signal from the printer register position sensor 16 is input to the head synchronizing signal generating circuit 38 through a line 53, and the time delay until the copy position is reached after the BJ head unit 18 passes the registration position by N.P. L.
E. A signal indicating the copy width in the main scanning direction according to the copy paper size, that is, a nozzle enable signal (hereinafter NE) for each color is output to the reader / printer synchronous memory 34 via the line 54 by counting the signals. To do.

The reader / printer synchronization memory 34 buffers the speed difference between the reader main scanning motor 6a and the printer main scanning motor 6b, and synchronizes the density data input from the reader unit with the speed of the printer, that is, N.M. L. E. Output in synchronization with the signal. From the image processing circuit 33 to the V. D. V. When a signal is input, that is, only the effective part of the video data is V. L. E. The data is sequentially written in synchronization with the head synchronizing signal generating circuit 38. E. When a signal is input, that is, when an ink jet head is present in the copy area, the density data written in the memory is used as head data. L.
E. Are sequentially read out in synchronization with. The data of each recording head read from the reader / printer synchronization memory 34 is output to the printer synchronization circuit 35 through the line 55.

In the printer synchronizing circuit 35, head data of four colors Y, M, C, and Bk, which are color-separated from the image of the original S′1 point, are input simultaneously through the line 55, but the head data of these four colors are input. Positioning processing is performed by the distance in the main scanning direction between the heads corresponding to the respective colors.

That is, as shown in FIG. 6-f, if the distance between the inkjet heads corresponding to the respective colors of Y, M, C, and Bk is L ₂ , then the document x
Dot Y. M. In order that the images of the inks of C and Bk are overlapped and printed at the same point in the main scanning direction of the inkjet head, the speed of main scanning is set to V and L ₂ / V is applied to each color head.
You can hit it with a time delay. That is, the printer synchronization circuit 35 receives the color head data of M, C, and Bk up to the position of the Y head where the image is first printed in the forward direction of the main scanning.
This is achieved by temporarily storing the data in the internal buffer memory, sequentially outputting it from the printer synchronization circuit 35, and inputting it to the printer head drive circuit 36. The vertical direction in FIG. 6-f is the time axis, not the sub-scanning direction.

In addition, the printer synchronization circuit 35 has an N.S. E. The signal is input, and the NE signal is a signal indicating the copy area of the Y head,
From this NE signal, a head drive enable signal (hereinafter referred to as H.D.E.
Signal) and input to the printer head drive circuit 36 through the line 56. In the printer head drive circuit 36, the N. E. Signal, N.N. L. E. Signal, H. D. E. From the signal and the clock φ, the drive signal of the ink jet head in the printer head unit 18 and the head data corresponding to each color are output to the printer head unit 18.

The image of the original is read by the reader 3 according to the above flow and is formed by the printer 4. The image controller is a V. 3 generated by the reader 3 and the printer 4. E. Signal and N.P. E. When the end of the signal is detected, the end of one-line copying in the main scanning is judged (step 14) and the process proceeds to step 15.

(Post-Processing) In step 15, the sequence controller 23 first turns off the exposure lamp 19 and turns off the motors to the respective motor driver circuits 26a and 26b of the reader and the printer.
Signal is input, and then the speed data in the reverse direction and the rotation start signal are sent to turn on the respective motors 6a and 6b.
Then, reverse movement is started and each main scanning home position 1
Stop at 1,12. At the same time, in step 16, the reader sub-scanning stepping motor 9a (hereinafter referred to as the leader sub-scanning motor) is fed a predetermined number of pulses in accordance with the copy magnification in the sub-scanning forward rotation mode to feed the reader for one sub-scanning. Similarly, the printer sub-scan stepping motor 9b (hereinafter referred to as printer sub-scan motor) also feeds one sub-scan. Next, in step 17, the sub-scanning counter is incremented, and in step 18, it is determined whether or not the sub-scanning counter is advanced by the copy width in the sub-scanning direction. If the count is not advanced, the process returns to step 8 and main scanning is performed. Is repeated until the sub-scanning counter is incremented.
When the sub-scanning counter is incremented, the process proceeds to step 2, and a predetermined pulse number is sent to each sub-scanning motor of the reader printer in the sub-scanning backward rotation mode to restore the home position. Next, in step 3, a head recovery operation for cleaning the inkjet nozzle head after the copying is completed is performed, and in step 4, the head is capped, and in step 5, the input of the next copying command is waited. The above is the outline of the operation of the apparatus.

(Film Projection System) The digital color image forming apparatus 100 of this embodiment can be equipped with projection exposure means for film projection. Both the negative film and the positive film are exposed by this projection exposure means, read by the same reading sensor unit 17 and recorded by the same recording head unit 18.

FIG. 9A is a perspective view when the projector is attached to the main body of the apparatus 100.

103 is a projector for projecting negative and positive films. 104 is an arm for supporting the projector 103.
5 is a level for moving the projector 103 up and down. FIG. 9b shows a connecting portion between the rail 105 and the main body 100, and 106 is a micro switch for issuing a signal indicating that the projector 103 is mounted on the main body 100. When the projector 103 is moved along the rail 105, the projection surface of the projector 103 is brought into close contact with the platen glass 1.

The reading and recording operations are executed by moving the reading sensor unit 17 and the recording head unit 18 as in the case of the reflection exposure described above.

FIG. 10 shows the internal structure of the projector 103. Direct light emitted by the projection system illumination lamp 115 and reflected light reflected by the reflector 114 are condensing lens 11
It is collected by 6 and reaches the window of the film carrier 117. The film carrier 117 includes a negative film on the top and bottom,
It has a window slightly larger than one frame of the positive slide, and the film 18 or the positive slide can be mounted inside.

The projection light reaching the upper window of the film carrier 117 projects the film 118 to obtain an image, and then the negative color correction filter 120 or the positive color correction filter 1 from the lower window.
Color correction is performed by 19. Generally, a color correction filter depends on the type of film in the case of a negative film, but an orange base is usually used, and a filter called an orange mask is used to remove this. In the case of a positive film, it is a filter used to correct the optical system such as a light source, a lens, a reading sensor and the like. In the case of a negative, an orange mask and a positive filter may be used together. Further, the filter may not be used when positive. The positive filter 119 and the negative filter 120 are a file driving motor 123 and a positive filter position sensor 1
21, by the negative filter position sensor 122,
You can move it to either position. The filter position sensors 121 and 122 are photo interrupters in this embodiment, and output a high level when light is blocked by the shutter. The image color-corrected by the filter is optically magnified by the magnifying lens 124, and then converted into a parallel light image by the Fresnel lens 125. After this, a video signal can be obtained from the reading unit 17 inside the main body 100. FIG. 11 shows a film carrier 117
The inside of the carrier has a groove in the width of the negative film from one end to the other as shown in the figure, and a groove in the size of the slide frame near the lower window in the center. 127 allows automatic switching between positive and negative. Generally, a negative film is used in the state of a film which has been continued for several frames, and a positive slide is used by separating it frame by frame and attaching a fixed slide frame made of cardboard or the like. Therefore, in FIG. 11, when the negative film is mounted, the mounting switch 127 is not pressed, and the output signal is low level. When the positive film is mounted, the mounting switch 127 is pressed and a high level mounting signal is output. To be done. Further, image area slits 128a and 128b are provided on the front, rear, upper and lower sides of the lower window,
It is used to automatically recognize the effective image area, remove the black frame appearing in the invalid area, and record only the effective image. That is, the image projected by the projector 103 is read by the sensor unit 1
When the video signal is obtained by 7, the video signal represents black in the portion where the projected image does not come, that is, the invalid image processing area, and when it is output as it is, black is printed in the area other than the effective image area.

Therefore, in order to prevent this, the image area start slit 1
The projection light that has passed through 28a is detected, and the detection signal is used as the start of the effective image area, and the reading and recording of the projection image are started. Next, when the projection light passing through the image area end slit 128b is detected, the effective image area is ended with this signal, and the reading and recording of the projected image are ended. Further, the upper and lower slits are provided to select an element to which an effective image of the reading sensor array having a plurality of elements is given, and these four slits enable accurate recording of only the effective image.

FIG. 12 is a block diagram of a sequence control device and an image control device inside the main body 100. Block in the figure
II is an image control block, and block I is a sequence control block. In block I, 129 is a microcomputer for controlling the system, 130, 131,
Reference numeral 132 denotes a drive device for a reflection system illumination lamp, a projection system illumination lamp, and a color correction filter switching motor, respectively.
Further, 133 is an illumination lamp power supply, which can control the voltage by a signal from the microcomputer 129 to change the lamp light amount between negative and positive. In the case of the present embodiment, a larger amount of light is required in the case of the negative than in the case of the positive, so the lamp power supply voltage for the negative is higher than that for the positive, and this is controlled by the lamp light amount conversion signal. In this case, the lamp light amount conversion signal is set to high level for positive and low level for negative. In block II, 134 is an image control circuit that performs image processing of a video signal.

When the shading correction circuit 60 performs shading correction, a RAM 137 that stores data obtained by reading the standard white plate, and a table ROM1 that performs shading correction conversion of the video signal based on the read data of the standard white plate.
38. When a shading signal is input from the microcomputer 129 to the image control circuit 134, the image control circuit 134 sequentially stores the reference data obtained by reading the standard white plate data in response to the address data and the write signal ▲ ▼. The reference data and the video signal of the input image are input to the address input of the ROM 138, and the video signal after the shading correction is output from the output data line. At this time, the light quantity of the projector illumination lamp and the color correction filter change, and the optical characteristics change in the case of negative and positive.Therefore, the reference data is switched by the negative / hosi conversion signal, and the shading correction is changed in the case of negative and positive. Alternatively, the shading correction is not performed in either case. In this embodiment, as shown in FIG. 12, when the film mounted on the projector is negative, 0 is entered in all the portions of the ROM 138 where the reference data is input. Therefore, if the correction data for the negative is written in the address corresponding to 0, the shading correction for the negative filter is not performed, and if the data in which the input video signal is output as it is is written, the shading correction is not performed.

In the present embodiment, the logarithmic conversion circuit 61 performs the input system gradation correction using the table ROM as in the shading correction, and changes the correction by the negative / positive conversion signal. (The above corresponds to the control means of the present invention in this embodiment.) Reference numerals 140a and 140b are a passing buffer and an inversion buffer, respectively. The negative / positive conversion signal inverts the video signal in the negative case, and the normal rotation in the positive case. So that a regular image can be obtained. The normal or inverted signal is input to the black extraction circuit 62 and the edge extraction circuit 63 described with reference to FIG. Finally, a binarized signal is obtained, input to the gate circuit 144, and sent to the printer side.

FIG. 13 is a flowchart of the sequence of this device. The operation will be described below with reference to FIG. First, in step 1, after the power is turned on, it is checked whether or not the projector mounting switch 106 is turned on. If it is off, the process moves to step 2 and the reflection system mode is set, and the reflection system illumination lamp 110
Enable, turn off the illumination lamp 115 of the projector 3,
The fan motor 126 is turned off, and the process proceeds to step 6.

When the projector mounting switch 106 is off, the process proceeds to step 3 and the projector mode is set. At this time, the reflection system illumination lamp 110 is prohibited, the projection system illumination lamp 115 is enabled, and the fan motor 126 is turned on to start blowing air. After this, the positive film mounting switch 127 is turned on.
Check off.

(I) When the switch 127 is turned on The process proceeds to step 4 and the positive film loading mode is set. Thereafter, the signal from the positive color correction filter position sensor 121 is checked to see if the positive color correction filter 119 is installed. If not, the filter drive motor drive signal is turned on to turn on the filter drive motor. Drive 123 and mount the positive filter 119. After this, the negative / positive conversion signal is turned on and input to the image control circuit 134 so that the shading correction circuit 136 performs positive correction, and the pass buffer 140 is also used.
Enable a to pass data. Next, the light quantity conversion signal is turned on to lower the lamp voltage as compared with the case of a negative film to prepare for a positive film, and the process proceeds to step 6.

(II) When the switch 127 is off: Move to step 5 and enter the negative film loading mode. After that, the signal of the negative color correction filter position sensor 122 is checked, and if it is not mounted, the drive motor 12
Drive 3 to check the installation. After that, the negative / positive signal is turned off and the shading correction is cut by the shading correction circuit 60, or the correction data different from the negative is selected, and the inversion buffer is enabled to output the output video of the logarithmic conversion circuit 61 for the input gradation correction. Invert the signal and send it to the next stage. After that, the light amount conversion signal is set to low to increase the light amount of the lamp and the process proceeds to step 6 in preparation for the negative film.

In step 6, data such as the size of the recording paper and the scaling factor are input from the operation panel, the area to be scanned for reading or recording an image is determined by this data, and the copy start key is input. wait. If there is no input, the procedure moves to step 1 to prepare for resetting due to mode change, input data change, or the like. If there is a copy start key input, the process proceeds to step 7 to determine whether the currently set mode is the photographing system mode or the reflection system mode. If there is, go to step 9. The case of the reflection system mode has already been described.

FIG. 14 shows the detailed flow of step 8.

In FIG. 14, first, the illumination lamp of the projector is turned on, and after confirming that the lamp light amount becomes constant, main scanning of the reader is started. At this time, first, the image data gate signal is turned off to disable the image data gate, and the slit 1
The counter for counting from 28 to the effective image area is cleared. Next, while determining the output BK signal of the black extraction circuit 62 of FIG. 12 in step 13, the image data gate is turned on / off to extract only the effective image area and send it to the next stage. This determination will be described with reference to FIG. Incidentally, CC
The arrangement direction of the D elements is parallel to the longitudinal direction of the slit 128ab. FIG. 15 SBK shows the black signal level.

Immediately after the scanning is started, the image data in the area A in FIG. 15 and the invalid image area are sampled. In the area A, light does not come in, so the BK signal is black. When the sampled image data is black, the image data gate circuit 144 is turned off so that the data does not go to the printer side. Next, when the reading sensor 17 enters the area B, the image data shows white due to the direct light from the slit. When this is discriminated, the image data counter is incremented and counted up, that is, the slit 1
When the number of image data corresponding to the distance from 28 to the effective image area has been counted, the reading sensor 17 determines that the area has entered the area C and turns on the image data gate circuit 144 to start the image data transmission to the next stage. Here, in step 13, the gate is turned off until the image data becomes white, and when the image data becomes white, the process proceeds to step 14. Sweep 14-1
In 6, it is determined that the sampled image data is white, and at the same time, a counter is used to perform a plurality of readings in the area B to take measures against disturbance such as noise. That is, if the image data changes from black to white and the counter counts up, that point is set as an effective image area, and if there is data other than white before the counter counts up, it is judged to be a disturbance and the process proceeds to step 12. I will return. In step 17, it is judged that the reading sensor 17 has entered the effective image area C, the data is sent to the next stage and the necessary image processing is performed, and then the process returns to step 10 in FIG. 13 to record the processed data. Print on paper. When copying of one main scanning line is completed, the process returns to step 7, the above-described processing is performed for the next main scanning, and reading is performed one after another, and when the number of sub-scanning reaches a number that covers the effective image area, it is determined that copying is completed. The process moves to 1 to prepare for the next copying operation.

<Effect> As described above, according to the present invention, since the film is read using the line sensor, the film can be read at high speed. Furthermore, according to the present invention, since the correction characteristic of the gradation correction means is changed depending on whether the film is negative or positive, it is possible to compensate for the change in the image signal level due to the difference in the film. Depending on whether the film is negative or positive, the correction characteristics of the shading correction means are controlled so as to be suitable in each case, so that high-gradation image signals can be obtained for both films.

It should be noted that in the present embodiment, the determination of negative or positive is automatically performed, but it may be selected by manual input.

[Brief description of drawings]

FIG. 1 is a perspective view of an apparatus according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of an apparatus according to an embodiment of the present invention, FIG. 3 is a block diagram of a control circuit according to an embodiment of the present invention, and FIG. Timing chart, FIG. 5 is a flow chart of the sequence,
FIG. 6-a is a diagram showing the relationship between the original document of the reader and the reading synchronization signal, FIG. 6-b is an enlarged view of the portion A of FIG. 6-a, and FIG. 6-c is an explanation accompanying the displacement of each color reading CCD. FIG. 6-d is a diagram showing the relationship between the copy paper and the recording synchronization signal, FIG. 6-e is an enlarged view of part B of FIG. 6-d, and FIG. 6-f is for the misalignment of the ink jet head of each color. FIG. 7-a is a diagram showing the frequency division timing according to the scaling factor of the encoder pulse of the reader main scanning motor, and FIG. 7-b shows the read pixel interval in the main scanning direction according to the scaling factor. FIG. 7-c is an explanatory diagram of the interpolation and thinning-out operation according to the scaling ratio, FIG. 7-d is a detailed circuit diagram of the scaling buffer memory 31 of FIG. 3, and 7-e.
FIG. 7 is a detailed circuit diagram of the video data synchronization signal generation circuit 28, FIG. 7-f is a timing chart diagram of the video data synchronization signal, FIG. 8-a is a detailed circuit diagram of the image processing circuit 33, and FIG. 8B is a diagram showing the input / output relationship of the edge extraction circuit 63 of FIG. 8-A, FIG. 9A is a perspective view of the projector 103 and the main body 100, and FIG. 9B is a diagram of the projector 103. Partially cutaway view, FIG. 10 is a block diagram of the inside of the projector 103, FIG. 11 is a perspective view of the film carrier 117, FIG. 12 is a control block diagram, and FIGS. 13 and 14 are control flowchart diagrams.
FIG. 15 is an explanatory diagram of the effective image area.

Claims (1)

[Claims] 1. A line sensor for reading an image and generating an image signal, a light emitting means for exposing an image on a film at the time of reading by the line sensor, and a shading correction for the image signal generated by the line sensor. Shading correction means for performing, gradation correction means for performing gradation correction on the image signal subjected to shading correction by the shading correction means, generation means for generating a signal indicating whether the film is negative or positive, generated by the generation means And a control unit that controls so as to change the correction characteristics of the shading correction unit and the gradation correction unit based on the received signal.