JPH0593610A - Camcorder - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a video tape recorder with a built-in camera capable of measuring a moving distance of a target object only by adding a simple circuit configuration. [Structure] A size of a target object is obtained by performing binarization processing of a video signal of a target object captured by an image memory 7 arranged in a plane corresponding to an image capturing screen and an image sensor 1 whose screen is fixed. And the binarization processing signal of the target object before the movement at each position on the image memory 7 corresponding to the position of the target object on the CCD sensor of the image sensor 1 before and after the movement. Storage control circuit 8 for performing control to store the binarized signal of the target object after movement
And a microprocessor 9 for obtaining the actual movement distance of the target object by coordinate calculation based on each binarized processing signal on the image memory 7 stored by the storage control circuit 8.
And the configuration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder integrated with a camera for photographing a subject and recording it on a recording medium.

[0002]

2. Description of the Related Art Various devices such as a radar are provided for measuring the moving distance and moving speed of an object away from the object.

For example, a Doppler measuring device is one of them.

FIG. 6 shows a schematic configuration of a Doppler measuring apparatus, which mainly includes a transmitter 51, a transmitting antenna 52,
It includes a receiving antenna 54, a receiver 55 and a phase comparator 56.

That is, the transmitter 51 to the transmitting antenna 5
Radio waves or ultrasonic waves are transmitted through 2. The transmitted radio waves hit the target object 53 and are reflected, and the reflected waves are received by the receiver 55 through the receiving antenna 54. At this time, the phase comparator 56 measures the frequency difference between the transmitted radio wave and the received radio wave, and the moving speed of the target object 53 can be known from the frequency difference. Further, the moving direction is such that, for example, when the target object 53 moves from A to A ′ in the drawing, the wavelength becomes long due to the Doppler effect, and when it moves from A ′ to A, the wavelength becomes short. It can be identified from

[0006]

As described above, there are various methods for measuring the moving distance, moving speed, etc. of a target object.
It is against the miniaturization of the camera-integrated video tape recorder to install such various measuring devices in the camera-integrated video tape recorder because the device itself is large-scale, and it is also expensive in price. There was a problem that it was disadvantageous in terms of cost.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a camera-integrated video tape recorder capable of measuring a moving distance of a target object only by adding a simple circuit configuration. is there.

[0008]

In order to solve the above problems, a camera-integrated video tape recorder of the present invention comprises an image memory arranged in a plane corresponding to an image pickup screen and an image pickup element whose screen is fixed. The size of the target object is obtained by performing binarization processing of the image signal of the target object to be photographed, and it corresponds to the position of the target object on the image pickup element surface before and after the movement. A target object storage control unit that performs control to store the binarized signal of the target object before moving and the binarized signal of the target object after moving at each position on the image memory, The target object storage control unit is provided with a distance calculation unit that calculates the actual movement distance of the target object based on the binarized processing signals on the image memory.

[0009]

In the target object storage control unit, the size of the target object is obtained by binarizing the video signal of the target object photographed by the image sensor whose screen is fixed. Further, at each position on the image memory corresponding to the position of the target object on the image pickup element surface before and after the movement, the binarized signal of the target object before the movement and the target object after the movement Control is performed to store the binarized signal and the binarized signal, respectively.

That is, on the image memory arranged in a plane corresponding to the image pickup screen, the size corresponding to each of the position of the target object before the movement and the position after the movement of the target object is obtained. Will be stored.

The distance calculating section calculates the actual moving distance of the target object by coordinate calculation based on each binarized signal stored in the image memory. That is, the actual lateral movement distance of the target object is calculated from the distance between the two points of each binarized signal on the image memory and the focal length and image forming distance of the lens at that time. Next, the moving distance in the perspective direction is calculated from the change in the size of each target object indicated by each binarized signal. Then, from these calculation results, the actual moving distance of the target object (that is, the three-dimensional moving distance) is obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the electrical construction of a camera-integrated video tape recorder of the present invention.

In the figure, the output of the image pickup device 1 for converting the subject light input through the lens system 11 into an electric signal is:
It is guided to the signal processing circuit 2. In addition, the signal processing circuit 2
The output of the luminance signal separated by the process is introduced to the VTR system processing circuit 5 and the binarization circuit 6 thereafter, and
The output of the binarization circuit 6 is guided to an image memory 7 arranged in a plane corresponding to the image pickup screen. The output of the chroma signal separated by the signal processing circuit 2 is led to the VTR processing circuit 5.

The binarization circuit 6 receives the output of the binarization level variable volume 10 for adjusting the binarization level and the output of the storage control circuit 8 as well as the storage control circuit 8. It is bidirectionally connected to the image memory 7.

On the other hand, the output of the lens control circuit 4 which controls the lens system 11 is led to a microprocessor 9 which controls the operation of the entire apparatus and also calculates the moving distance of the target object. 9 and the storage control circuit 8 are bidirectionally connected.

Further, the image pickup device 1, the signal processing circuit 2, and the storage control circuit 8 are constructed so that the synchronizing signal from the SSG circuit 3 is introduced.

In the above structure, the binarization circuit 6 and the storage control circuit 8 constitute a target object storage control section, and the microprocessor 9 constitutes a distance calculation section.

FIG. 2 shows the configuration of the lens system 11 and the image pickup device 1, and the concave lens 11 arranged in the cylindrical mirror 21.
1, a focus lens 112 is arranged in front of the zoom lens 113, and a zoom lens 113 is arranged in the rear of the zoom lens 113. The focus lens 11 is provided below the cylindrical mirror 21.
Focus motor 114 for moving 2 back and forth, and zoom motor 11 for moving zoom lens 113 back and forth
5 are provided so that the drive control signal of the lens control circuit 4 is guided to each of the motors 114 and 115.

Next, the operation of calculating the moving distance of the target object in the camera-integrated video tape recorder having the above-mentioned structure will be described.

First, the image pickup screen of the image pickup device 1 is fixed, a camera-integrated video tape recorder is installed, and thereafter, image pickup of a target object is started.

As a result, the light of the target object imaged on the CCD sensor of the image pickup device 1 through the lens system 11 is converted into an electrical signal here, and the next signal processing circuit 2 produces a luminance signal and a chroma signal. After being separated into two, both signals are guided to the VTR system processing circuit 5, subjected to appropriate signal processing and recorded as a composite video signal on a recording medium (not shown).

On the other hand, the luminance signal output from the signal processing circuit 2 is also led to the binarization circuit 6. Binarization circuit 6
Is adjusted in advance by the binarization level variable volume 10 to a level at which only the target object can be distinguished. Therefore, in the luminance signal input to the binarization circuit 6, only the target object is extracted here and separated from the background.

Here, the storage control circuit 8 is the SSG circuit 3
The binarization circuit 6 and the image memory 7 based on the synchronization signal from
And the data indicating the target object distinguished from the background by the binarization circuit 6 are sequentially written in predetermined positions on the image memory 7. At this time, when the target object is moving, the image-forming position of the target object which forms an image on the CCD sensor of the image sensor 1 through the lens system 11 also changes following the movement, so that 2 The value-converted data of the target object is also rewritten on the image memory 7 at any time following its movement.

In such a state, the storage control circuit 8
Outputs a storage fixing signal to the image memory 7 immediately before the movement of the target object to fix the storage of the information of the target object written on the image memory 7 at that time. Further, the storage control circuit 8 outputs a storage fixing signal to the image memory 7 immediately after the movement of the target object to fix the storage of the information of the target object written in the image memory 7 at that time. The timing of outputting such a memory fixed signal can be set by, for example, a manual input operation by an operator operating the camera-integrated video tape recorder. However,
The input operation is not limited to the manual input operation, and it is also possible to detect the moving state and the stationary state of the target object and automatically set the output timing.

For example, when a ball is selected as the target object, the brightness (whiteness) is used to distinguish it from the background.
When the level is adjusted by the binary level variable volume 10, for example, the ball is stored as “1” and the background is stored as “0” at a predetermined position on the image memory 7.

FIG. 3 shows an example of the storage state of the binarized signal “1” indicating the ball stored in the image memory 7 in this way.

In this case, a set of "1" indicating the balls before the movement is stored in the upper left position of the drawing, and a set of "1" indicating the balls after the movement is stored in the right end position of the central portion of the drawing. The body is stored, and "0" is stored in all other areas. Further, the aggregate of “1” at this time also represents the size of the ball at that position. That is, the position and size of the ball before the movement and the position and size of the ball after the movement are stored in the image memory 7, respectively.

Thereafter, the storage control circuit 8 reads out the data stored in the image memory 7 and outputs it to the microprocessor 9. The microprocessor 9 calculates the actual moving distance L of the ball based on the data read from the image memory 7.

First, the microprocessor 9 determines the size of the ball before the movement and the size of the ball after the movement on the image memory 7, and the distance between the two points of the ball before the movement and the ball after the movement. Calculated from the memory coordinates (address). At this time, the size of each ball is C _S , C _E , and the distance between two points (that is, the moving distance in the lateral direction with respect to the image sensor 1) is l.
_Let it be _X. The focal length of the lens system 11 at this time is f. The focal length f has a unique value in the case of a single focus lens, and in the case of a zoom lens, the f value at that time can be read from the lens control circuit 4 (for example, from the rotation angle of the zoom motor 115). it can.

Here, FIG. 4 shows a general explanatory view of the optical system.

In this figure, the imaging distance is b (this b
Is the focus motor 11 of the lens control circuit 4.
4), the distance to the object is a, and the focal length is f.

[0033]

From 1 / a + 1 / b = 1 / f, the distance a to the object is

[0034]

## EQU2 ## It can be obtained as a = 1 / (1 / f-1 / b).

Further, the magnification M is

[0036]

## EQU3 ## M = b / a.

That is, the actual length L _X of the distance l _X between the two points of the ball obtained from the coordinates (address) of the memory is

[0038]

## EQU4 ## It can be obtained as L _X = l _X / M.

On the other hand, the actual movement distance L _Y in the perspective direction with respect to the image pickup device 1 is obtained as follows.

That is, the size or diameter of the ball at each position is the coordinate (address) of the memory as described above.
Can be obtained as C _S and C _E. Where E is the actual diameter of the ball, a ″ is the distance to the ball when the diameter of the ball is C _S (that is, before movement), and when the diameter of the ball is C _E (that is, after movement). If the distance to the ball is a ', the following equations hold.

[0041]

[Equation 5] C _S / E = b / a ″

[0042]

[Equation 6] C _E / E = b / a ′ Therefore, from the above equation 2,

[0043]

Equation 7 a ″ / a ′ = C _S / C _E holds.

Here, since both C _S and C _E are in a focused state (within the depth of field), the distance a to the object previously obtained from the relationship in FIG. Is
It can be approximated to be in the middle of a'and a ".
From the relationship shown in

[0045]

## EQU8 ## 2a = a '+ a "holds.

This equation and the equation obtained above

[0047]

Since a ′ and a ″ are obtained from a ″ / a ′ = C _S / C _E , the actual movement distance L _Y in the perspective direction can be obtained from the difference.

That is, since the actual lateral movement distance L _X and the actual perspective distance L _Y with respect to the image sensor 1 are obtained by the above-described calculations, the actual movement distance L of the ball is

[0049]

[Equation 10]

It can be obtained from

In the above embodiment, the actual moving distance of the target object is obtained by approximating the distance a to the object obtained from the relationship shown in FIG. 4 as being in the middle between a'and a ". , A
Even if it cannot be approximated that is between a ′ and a ″,

[0052]

## EQU00009 ## The actual movement distance L _Y in the perspective direction can be obtained from a "= [1-1 / 2 (1-a '/ a")] = a.

As a matter of course, it is also possible to measure the displacement before and after the movement by the processor and convert it into the moving speed.

[0054]

According to the video tape recorder integrated with a camera of the present invention, the target before moving is provided at each position on the image memory corresponding to the position before and after the moving of the target object on the image pickup element surface. Binarized signal of object and 2 of target object after moving
Since the binarization processing signal is stored respectively, and the actual moving distance of the target object is obtained by coordinate calculation based on each binarization processing signal stored in the image memory, the home camera integrated type With an inexpensive configuration in which only a few circuits are added to the video tape recorder, it is possible to easily measure the actual moving distance and moving speed of the target object, for example, the flying distance and speed of the ball.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a camera-integrated video tape recorder of the present invention.

FIG. 2 is a schematic configuration diagram of a lens system and an image sensor.

FIG. 3 is an enlarged view of an image memory.

FIG. 4 is a general explanatory diagram of an optical system.

FIG. 5 is a diagram showing the relationship between the position and size of the ball stored in the image memory and the actual position and size of the ball.

FIG. 6 is a schematic configuration diagram of a Doppler measuring device showing an example of a conventional measuring device that measures a moving distance and a moving speed of an object.

[Explanation of symbols]

 1 Image Sensor 6 Binarization Circuit 7 Image Memory 8 Storage Control Circuit 9 Microprocessor

Claims (1)

[Claims] 1. A camera-integrated video tape recorder for photographing a subject and recording the same on a recording medium, wherein the image is photographed by an image memory arranged in a plane corresponding to an image pickup screen and an image pickup device whose screen is fixed. The size of the target object is obtained by performing binarization processing of the video signal of the target object, and the image corresponding to the position of the target object on the image pickup device surface before the movement and the position after the movement. At each position on the memory, the target object before movement 2
A target object storage control unit that performs control to store the binarization processing signal and the binarization processing signal of the target object after movement, and each binary value on the image memory stored by the target object storage control unit A video tape recorder with a built-in camera, comprising: a distance calculation unit that calculates an actual moving distance of a target object by coordinate calculation based on a digitization processing signal.