JPH0937128A - Image input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image input device with which a high-definition still picture can be provided by eliminating timewise difference between fields in one frame while using plural interlace system electronic cameras. SOLUTION: The image of an object is optically separated by a beam splitter 2 and a video at the same time is made incident to plural interlace system electronic cameras 5 and 6. At a frame memory 13A, this video at the same time is fetched into mutually different fields and synthesized into one pieces of frame image data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input device, and more particularly, to an image input device capable of capturing a high-quality high-speed shutter image with little blur even when a still image is taken by using a conventional electronic camera or the like. It relates to the device.

[0002]

2. Description of the Related Art FIG. 10 is a block diagram showing a conventional image input device using an interlaced electronic camera. In the figure, 5 is an interlace type electronic camera, and the image signal output from the electronic camera 5 is an analog signal of an image together with a synchronizing signal. Reference numeral 9 denotes an A / D that converts image information of an analog signal from the electronic camera 5 into digital image data (field image data)
A conversion circuit 22 is a field discrimination circuit for discriminating a field or a frame of an image signal by a synchronization signal, and 13 is a digital image data from the A / D conversion circuit 9 which is synchronized with a field discrimination signal from the field discrimination circuit 22. A frame memory for storing as an image, 17 a D / A conversion circuit for converting digital data image information read from the frame memory 13 into analog data, and 23 other constituent elements than the electronic camera 5 among the above constituent elements. It is a still image input device including.

An interlaced electronic camera 5 is usually used.
Was originally adopted in response to the interlace display method of the monitor for the purpose of preventing flicker when displaying an image on a video device. Then, the still image input device 30 reads the digital data image information from the frame memory 13 and uses it for image processing and the like, and uses the analog data from the D / A conversion circuit 17 as image information for analog video equipment. can do.

Next, the operation will be described with reference to the time chart of FIG. In the interlace type electronic camera 5, the image signal is taken in every 1/60 second in the field, and in the 2: 1 interlace type, the image signal 5a of the two fields, the odd field and the even field, is A / D converted. After being converted into digital image data 9a and 9b respectively, the frame memory 13 synthesizes them in synchronization with the field discrimination signal 22a from the field discrimination circuit 22 and outputs one frame image data 13a every 1/30 seconds. For example, a subject image at a certain time is captured in an odd field, and then a subject image 1/60 seconds after this time is captured in an even field. Then, the image of the odd field and the image of the even field are combined and output as frame image data 13a. Further, the frame image data 13a is converted into an analog frame image signal 17a by the D / A conversion circuit 17 and output to the outside.

Therefore, when a fast-moving subject is photographed as a still image, a time shift of 1/60 seconds occurs between the odd field and the even field, and the finally synthesized frame image data is obtained. Since two pieces of image data having a time difference of 1/60 seconds are combined, a moving part is blurred as a dynamic part image, and an image with an unclear contour is formed.

[0006]

Since the conventional image input device is constructed as described above, it has the following problems. That is, in order to capture a still image with little blurring using an interlaced electronic camera, an image is captured in a field mode in which only one field signal is captured as an image, or a strobe flash having a light emission speed of 1/60 second or less is emitted. It is necessary to use a method of emitting light every 1/30 seconds for shooting, but in both cases, the outline of the shooting subject becomes blurred, so in order to analyze this image data,
There is a problem that processing such as data correction and sampling must be performed.

The present invention has been made in order to solve the above problems, and uses a plurality of interlace type electronic cameras and the like to provide a high-quality high-speed shutter with little blur even when a still image is taken. An object of the present invention is to provide an image input device that can directly store and process image data by capturing video.

[0008]

According to a first aspect of the present invention, there is provided an image input device, wherein optical means for separating an image of a subject and a plurality of interlace type photographing means for photographing the images separated by the optical means. And image forming means for synthesizing two different field information from the plurality of photographing means on the same time axis to form one frame image.

An image input device according to a second aspect of the present invention is the image input device according to the first aspect, wherein a plurality of optical means are provided.
A plurality of photographing means forming a pair corresponding to the plurality of optical means are provided.

Further, in the image input apparatus according to the invention of claim 3, in the invention of claim 1 or 2, the image forming means includes an A / D converting means for converting the field information from the photographing means into digital image data. A frame memory for synthesizing and storing digital image data at the same time from the A / D conversion means for different fields, and a synchronization signal generation means for generating a synchronization signal to the photographing means and the frame memory. It is a thing.

The image input device according to the invention of claim 4 is the image input device according to any one of claims 1 to 3, wherein the optical means separates a lens for collecting an image of a subject and an image from this lens. It consists of a spectroscope.

An image input device according to a fifth aspect of the present invention is the image input device according to the first aspect, wherein a still image input device for inputting an image signal from a photographing means as a still image is used instead of the image forming means. Is.

The image input device according to a sixth aspect of the present invention is the image input device according to any one of the first to fifth aspects, wherein the photographing means is an electronic camera. An image input device according to a seventh aspect of the present invention is the image input device according to any one of the first to fifth aspects, wherein the image capturing means is a solid-state image sensor.

Further, in the image input device according to the invention of claim 8, in the invention of claim 5, the photographing means is an electronic camera which outputs an image signal at a high speed by a non-interlace system. An image input apparatus according to a ninth aspect of the present invention is the image input apparatus according to any one of the sixth to eighth aspects, including an electronic computer system that reads a still image captured by the still image input apparatus and processes the image data. It is a thing.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Embodiment 1. 1 is a block diagram showing a first embodiment of an image input apparatus according to the present invention. In FIG.
The same reference numerals are given to the portions corresponding to and the detailed description will be omitted. In the figure, 1 is a camera lens to which an image of a subject to be captured is supplied, 2 is an image that has passed through the camera lens 1 and is separated into two images, one of which is used as an electronic camera 5 as a photographing means. Another is a spectroscope which is incident on the electronic camera 6 as a photographing means, 10 is an A / D conversion circuit for converting image information of an analog signal from the electronic camera 6 into digital image data (field image data), and 13A is described later. This is a frame memory for storing the digital image data from the A / D conversion circuits 9 and 10 as a still image in synchronization with the field synchronization signal from the field synchronization circuit.

Further, 14 is a field synchronizing circuit for generating a field synchronizing signal for controlling storage and reading with respect to the frame memory 13A and for synchronizing the electronic cameras 5 and 6, and 15 is a field synchronizing circuit 1.
4 is a field phase conversion circuit which inverts the field synchronization signal from 4 and supplies it to the electronic camera 5. The camera lens 1 and the spectroscope 2 constitute an optical means, the A / D conversion circuits 9 and 10 and the frame memory 13A constitute an image forming means, and the field synchronization circuit 14 and the field phase conversion circuit 15 generate a synchronization signal. Constitutes a means.

Next, the operation will be described. An image 1a of a subject to be photographed passes through a camera lens 1 and is separated into two images 3a and 3b by a spectroscope 2. One is incident on an electronic camera 5 and the other is incident on an electronic camera 6. . The output signal from the electronic camera 5 is an analog field image signal 5a, which is converted into digital image data 9a by the A / D conversion circuit 9 and written in the frame memory 13A. Similarly, the analog field image signal 6a from the electronic camera 6 is converted into digital image data 10a by the A / D conversion circuit 10, and the frame memory 13A is converted.
Written in. These two field image data are stored and read out by the field synchronization circuit 14 in the frame memory 13A, and finally read out as the frame image data 13a.

The electronic camera 5 and the electronic camera 6 are synchronized with each other by using the field phase conversion signal 15a from the field phase conversion circuit 15 and the field synchronization signal 14a from the field synchronization circuit 14 so that the subject images captured by the respective cameras at the same time are obtained. The fields are controlled so that they are different from each other. When the electronic camera 5 outputs the odd field image signal 5a, the electronic camera 6 outputs the even field image signal 6a, and conversely, the electronic camera 5 outputs the even field image. When the signal 5a is output, the electronic camera 6 outputs the image signal 6a of the odd field. The frame image data 13a from the frame memory 13A is converted into an analog frame image signal 17a by the D / A conversion circuit 17 and output to the outside. Further, the frame image data 13a from the frame memory 13A is D / A.
It is also possible to output directly to the outside without passing through the conversion circuit 17.

The electronic camera 5 and the electronic camera 6 are of a 2: 1 interlace system, and the image signal from the electronic camera 5 outputs an odd field signal and an even field signal every 1/60 seconds, and the electronic camera 6 outputs the odd field signal and the even field signal. As for the image signal of, the even field signal and the odd field signal are output every 1/60 seconds. At this time, two electronic cameras 5
The operation timings of 6 and 6 are controlled by the external synchronization signal so that the odd field signal is output from one electronic camera and the even field signal is output from the other electronic camera. The external synchronizing signal is controlled by the field synchronizing circuit 14 so that the output signal from each electronic camera has the output timing of the field image signal in which the odd field and the even field conflict with each other. Therefore, when the electronic camera 5 outputs the odd field image signal 5a, the electronic camera 6 outputs the even field image signal 6a at the same time, and when the electronic camera 5 outputs the even field image signal 5a. The electronic camera 6 outputs an image signal 6a of an odd field.

As a result, the odd field image signal 5a from the electronic camera 5 and the even field image signal 6a from the electronic camera 6, and the even field image signal 5a from the electronic camera 5 and the odd number from the electronic camera 6 are further provided. One frame image data is generated on the frame memory 13A in synchronization with the field image signal 6a. At this time, the A / D conversion circuits 9 and 10 are output from the electronic camera 5 and the electronic camera 6, respectively.
The field image data converted by is written in the frame memory 13A at a rate of 30 frames / second, and the read speed from the frame memory 13A is a frame obtained by combining the odd field image data and the even field image data. Image data is recorded at a speed of 60 frames / second.

Next, the state of the above operation will be described with reference to the time chart of FIG. Note that in FIG. 2, each signal is at a low level (hereinafter referred to as "L") in a steady state, and the operating state of each signal is superior at a high level (hereinafter referred to as "H"). Indicates that. The image signal 5a from the NTSC interlaced electronic camera 5 is
Image signal of odd field (A ₁₁ ,
A _21, ...) and even-numbered field image signals (A _12, A _22, is outputted as a ...). Similarly, the image signal 6a from the electronic camera 6 is even field image signals (B ₁₁ , B ₂₁ , ...) And odd field image signals (B ₁₂ , B ₂₂ ,. ) Is output. At this time, the operation timings of the two electronic cameras 5 and 6 are controlled by an external synchronizing signal when the field synchronizing signal 14a is "L", that is, when the field phase conversion signal 15a is "H". A signal is output, and the electronic camera 6 outputs an image signal of an even field. Similarly, when the field synchronization signal 14a is "H", that is, when the field synchronization signal 15a is "L", the electronic camera 5 outputs an even field image signal and the electronic camera 6 outputs an odd field image. The signal is output.

The field image signals (image signals at the time of "H") from the electronic cameras 5 and 6 output in this manner are A / D converted into the field image data 9a and 9b, and then the frame memory 13A. In the above, the frames are combined into one frame image data 13a, and thus the frame image data 13a can be generated every 1/60 seconds. For example, focusing on the first frame in FIG. 2, the field image data 9a (a ₁₁ ) corresponding to the image signal 5a (A ₁₁ ) of the odd field from the electronic camera 5 and the even number from the electronic camera 6 are taken. The first frame image data 13a (a ₁₁ , b ₁₂ ) is generated in 1/60 seconds by combining the field image data 10a (b ₁₂ ) corresponding to the field image signal 6a (B ₁₂ ). From this, it can be seen that the frame image data is generated at a high speed as compared with the conventional case where one frame image data is generated every 1/30 seconds.

As described above, in the first embodiment, since the image data of the odd field and the even field forming each frame image data outputs the image at the same time every 1/60 seconds, one image data is output. It is possible to realize a high-speed electronic camera system that is one of image input devices that outputs frame image data that does not have a temporal difference between the field image data in the frame image data.

In addition, in the first embodiment, as shown in FIG. 3, the frame image data 1 is read from the frame memory 13A.
It is needless to say that it is possible to easily output the frame image data every 1/30 second by thinning out and reading out the data 3a every 1/30 second, and in this case, there is a temporal difference between the fields. Even though there is no frame image data, the output of the frame image data can be handled in the same manner as the output of the frame image data from a normal interlaced electronic camera. Furthermore, in the above description, the output time of the image signal of each field is 1/6.
0 seconds, and the output time of frame image data is 1/3
Although it is set to 0 second or 1/60 second, it is obvious that the same function can be achieved even when the output is performed at a different time.

Embodiment 2 FIG. 4 is a block diagram showing the second embodiment of the image input device according to the present invention. Components corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the figure, 3 is placed on one side surface of the spectroscope 2, and electronic images 5 and 6 arranged on one side of the spectroscope 2 are arranged so that their optical axes are orthogonal to each other. The spectroscope 4 which is incident on the other side of the spectroscope 2 is placed on the other side surface of the spectroscope 2, and the other image separated into two by the spectroscope 2 is arranged, for example, so that their optical axes are orthogonal to each other. As incident light on the electronic cameras 7 and 8 and 11 and 12 are A / D conversion circuits for converting image information of analog signals from the electronic cameras 7 and 8 into digital image data (field image data), respectively.
Reference numeral 13B is a frame memory which stores digital image data from the A / D conversion circuits 9, 10, 11 and 12 as a still image in synchronization with a field synchronization signal from a field synchronization circuit described later.

A field sync circuit 14A generates a field sync signal for controlling storage and reading of the frame memory 13B and for synchronizing the electronic cameras 5 and 6 and the electronic cameras 7 and 8, respectively. , 16 are field phase conversion circuits which invert the field synchronization signal 14b from the field synchronization circuit 14A and supply it to the electronic camera 7. Other configurations are the same as those in FIG. The camera lens 1 and the spectroscopes 2 to 4 constitute optical means, the A / D conversion circuits 9 to 12 and the frame memory 13B constitute image forming means, and the field synchronization circuit 14A and the field phase conversion circuits 15 and 16 are provided. Constitutes a synchronizing signal generating means.

Next, the operation will be described. The image 1a of the subject to be photographed passes through the camera lens 1 and is separated into two images by the spectroscope 2. Further, these images are separated into two images by the spectroscopes 3 and 4, respectively, and finally. Are separated into four images 3a, 3b, 4a, 4b. The first image is sent to the electronic camera 5, the second image is sent to the electronic camera 6, the third image is sent to the electronic camera 7, and the fourth image is sent. The image is incident on each of the electronic cameras 8. The output signals (image signals) from each camera are A / D
It is converted into digital image data through the conversion circuits 9, 10, 11 and 12 and written in the frame memory 13B. At this time, the operation timings of the output signals of the electronic cameras 5 and 6 are controlled by the field phase conversion signal 15a and the field synchronization signal 14a, and the electronic cameras 7 and 8 are controlled by the field phase conversion signal 16a and the field synchronization signal 14b.
The operation timing of the output signal is controlled by.

Next, the manner of the above operation will be described with reference to the time chart shown in FIG. The image signal 5a from the electronic camera 5 is output as an image signal of an odd field and an image signal of an even field every 1/60 second, and the image signal 6a from the electronic camera 6 is also an image of an even field every 1/60 second. It is output as a signal and an image signal of an odd field. Where the field sync signal 1
4b is for the field synchronization signal 14a, and the field phase conversion signal 16a is for the field phase conversion signal 1
Each has a time difference of 1/120 seconds with respect to 5a,
The output timings of the electronic cameras 5 and 6 and the electronic cameras 7 and 8 are controlled. As a result, the field image data 9a and 10a and 11a and 12a passed through the A / D conversion circuits 9 and 10 and the A / D conversion circuits 11 and 12, respectively.
Is written as image data in the frame memory 13B every 1/120 second, and is read out from the frame memory 13B as frame image data 13a every 1/120 second. As a result, it is possible to realize a high-speed electronic camera system, which is one of the image input devices with a higher frame shutter output.

Even in this case, since there is no time difference between the corresponding fields in each combination of the odd field and the even field, even if the frame image data is read as a still image, the two field images to be combined are combined. A still image with no temporal blur between data can be obtained. Note that, here, for convenience of explanation, the electronic cameras 5 to 5 are used.
Although the description has been made using four of eight, the number of electronic cameras is not limited to four or more without limiting the number of electronic cameras by further configuring the spectroscope for the image of the subject passing through the camera lens 1. Obviously, it can be configured. Further, in this case, the reading speed of the frame image data from the frame memory 13B can be further increased by setting the reading speed of the frame image data to two, which is a multiple of the configuration in which one pair of electronic cameras is set.

Embodiment 3 6 is a block diagram showing Embodiment 3 of the image input apparatus according to the present invention. Components corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the figure, reference numerals 18 and 19 are charge-coupled devices (hereinafter, referred to as CCDs) as photographing means which are one of solid-state image pickup devices used as image devices of electronic cameras.
Other configurations are the same as those in FIG.

Next, the operation will be described with reference to FIG. An image 1a of a subject to be photographed passes through a camera lens 1 and is separated into two images 3a and 3b by a spectroscope 2, one of which is incident on a CCD 18 and the other of which is incident on a CCD 19. The output signal from the CCD 18 is a field-stored image signal 18a, which is written in the frame memory 13A as field image data 9a through the A / D conversion circuit 9 for each field. Similarly, CCD19
The field-accumulated image signal 19a is also written into the frame memory 13A as field image data 10a through the A / D conversion circuit 10 for each field. The two field image data are controlled by the field synchronization circuit 14 for writing and reading in the frame memory 13A.
The field synchronization signal 14a is used to finally read the frame image data 13a. This frame image data 13a is the D / A conversion circuit 1
It is converted into an analog frame image signal 17a by 7 and output.

Alternatively, the digital frame image data 13a can be directly output without passing through the D / A conversion circuit 17. Note that, here, for convenience of explanation, the CCD 1
Although the description has been made using two of 8 and 19, the spectroscope 2 has a multi-stage configuration for the image of the subject that has passed through the camera lens 1, so that the number of the two or more configurations is not limited. It is obvious that That is,
For example, in FIG. 4, C is used instead of the electronic cameras 5-8.
A CD may be used. Further, in this case, the reading speed of the frame image data from the frame memory 13A can be further increased by setting the reading speed to two, which is a multiple of the configuration in which one pair of CCDs is set.

Embodiment 4 FIG. 8 is a block diagram showing Embodiment 4 of the image input apparatus according to the present invention. Components corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the figure, reference numeral 20 denotes a still image input device, and this still image input device 20 includes the above-mentioned A / D conversion circuits 9 and 1.
0, frame memory 13A, field synchronization circuit 14,
Field phase conversion circuit 15 and D / A conversion circuit 17
including. The operation is the same as in the first embodiment.
Here, the interlaced image signal outputs from the electronic camera 6 and the electronic camera 5 are controlled by the field synchronization signal 14a from the field synchronization circuit 14 and the field phase conversion signal 15a obtained by inverting this signal in the field phase conversion circuit 15, respectively. The image signal is input to the still image input device 20.

Thus, an inexpensive electronic camera of the interlace system can be used to configure a device that performs the same function as the image input device shown in the first embodiment. In addition, although the case where the circuit configuration of FIG. 1 is used as the still image input device 20 has been described in this embodiment, the circuit configuration of FIG. 4, that is, the A / D conversion circuits 9 to 12, the frame memory 13B, and the field. Synchronization circuit 14A, field phase conversion circuits 15 and 16 and D / A conversion circuit 1
7 may be included, and the same effect can be obtained.

Embodiment 5 FIG. FIG. 9 is a configuration diagram showing a fifth embodiment of the image input apparatus according to the present invention. The parts corresponding to those in FIG. 8 are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, 21 is an electronic computer system,
The electronic computer system 21 is connected to the frame memory 13A of the still image input device 20. Then, by incorporating the frame image data 13a, which is the output signal from the frame memory 13A, into the electronic computer system 21, a system for accumulating and analyzing the image data can be configured.

Further, the image data can be taken into the electronic computer system 21 by using the analog frame image signal 17a through the D / A conversion circuit 17 to form a similar system. In addition, the still image data obtained by taking moving image data into the computer system 21 as a subject realizes a pseudo moving image by recording and storing and reproducing and displaying continuous still images, or supports for image analysis such as stop motion. The function can be easily realized. In addition, by drawing a still image by using the printing function of the electronic computer system 21, by further storing known data in the image data in advance, or by obtaining prediction data, the actually captured image data is acquired. It is possible to perform an image data analysis process and an automatic diagram by comparing and estimating the correlation with.

[0037]

As described above, according to the present invention, an image obtained through a camera lens is separated into a plurality of same images by a spectroscope, and the plurality of same images are respectively applied to a plurality of electronic cameras or solid-state image pickup devices. Since two field image data, that is, an odd field and an even field, are generated from the images captured at the same time and are combined to form one frame image data, the conventional still image can be used to capture a moving subject. There is an effect that blurring in one frame image data due to a temporal shift between fields at the time of shooting is eliminated, and a high-definition still image signal can be obtained.

Further, according to the present invention, it is possible to obtain a still image input device capable of obtaining a high-definition still image video signal in the same manner as described above, even when a conventional interlace type inexpensive electronic camera is used. The effect is that you can do it. Further, according to the present invention, a video signal from a CCD or the like, which is a solid-state image pickup device of an electronic camera, is rapidly captured in a field unit on a plurality of same time axes and is combined as one frame to output a high-speed frame video. There is an effect that it is possible to realize a high-speed frame shutter camera that obtains.

Further, according to the present invention, a system for accumulating and analyzing the image data can be constructed by incorporating the frame image data from the still image input device into the electronic computer system, and to the electronic computer system. The same system can be used for capturing image data by using an analog frame image signal through a D / A conversion circuit. Furthermore, still image data obtained by capturing moving image data as a subject into an electronic computer system. Has an effect that it is possible to easily realize a pseudo moving image by recording and storing and reproducing and displaying continuous still images, or to easily realize a support function for image analysis such as stop motion. Furthermore, by plotting a still image using the printing function of the electronic computer system, storing known data etc. in the image data in advance, and obtaining prediction data, the correlation with the actually captured image data is obtained. There is an effect that it is possible to perform an image data analysis process and an automatic diagram by comparing the relationships and estimating the correlation.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of an image input apparatus according to the present invention.

FIG. 2 is a time chart used for explaining the operation of the first embodiment of the image input apparatus according to the present invention.

FIG. 3 is a time chart used for explaining another operation of the first embodiment of the image input apparatus according to the present invention.

FIG. 4 is a configuration diagram showing a second embodiment of an image input device according to the present invention.

FIG. 5 is a time chart used to explain the operation of the second embodiment of the image input apparatus according to the present invention.

FIG. 6 is a configuration diagram showing an image input device according to a third embodiment of the invention.

FIG. 7 is a time chart used to explain the operation of the third embodiment of the image input apparatus according to the present invention.

FIG. 8 is a configuration diagram showing a fourth embodiment of an image input device according to the present invention.

FIG. 9 is a configuration diagram showing a fifth embodiment of an image input apparatus according to the present invention.

FIG. 10 is a configuration diagram showing a conventional image input device.

FIG. 11 is a time chart for explaining the operation of the conventional image input device.

[Explanation of symbols]

 1 camera lens 2,3,4 spectroscope 5,6,7,8 electronic camera 9,10,11,12 A / D conversion circuit 13A, 13B frame memory 14,14A field synchronization circuit 15 field phase conversion circuit 17 D / A conversion circuit 18, 19 Charge coupled device (CCD) 20 Still image input device 21 Electronic computer system

Claims (9)

[Claims] 1. An optical unit for separating an image of a subject, a plurality of interlaced image capturing units for capturing the image separated by the optical unit, and two different field information from the plurality of image capturing units. An image input device comprising: an image forming unit that forms one frame image by combining them on the same time axis. 2. The image input device according to claim 1, wherein there are a plurality of optical means, and a plurality of pair of photographing means are provided corresponding to the plurality of optical means. 3. The image forming means converts the field information from the photographing means into digital image data and the digital image data at the same time from the A / D conversion means for different fields. 3. The image input device according to claim 1, further comprising a frame memory for combining and storing the image data, and a synchronizing signal generating unit for generating a synchronizing signal to the photographing unit and the frame memory. 4. The image input device according to claim 1, wherein the optical means includes a lens that collects an image of a subject and a spectroscope that separates an image from the lens. 5. The image input device according to claim 1, wherein instead of the image forming device, a still image input device for inputting an image signal from the photographing device as a still image is used. 6. The image input device according to claim 1, wherein the photographing means is an electronic camera. 7. The image input device according to claim 1, wherein the photographing means is a solid-state image sensor. 8. The image input device according to claim 5, wherein the photographing means is an electronic camera which outputs an image signal at a high speed by a non-interlaced method. 9. The image input device according to claim 6, further comprising an electronic computer system that reads a still image captured by the still image input device and processes the image data.