JPH0245871B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-speed television camera device, and particularly to a high-speed television camera device that analyzes the behavior of a moving object.

Technical Background High-speed television camera devices are well known that photograph the movements of various moving objects using high-speed television cameras, and analyze the images of the objects to scientifically analyze the movement state of the moving objects. It is widely used for physical analysis of sports and physical education research of sports movements.

Prior Art FIG. 1 shows a schematic configuration of a conventional high-speed television camera device, in which incident light from a subject is focused by an incident lens 10 to form a subject image, and this subject image is captured and recorded in an imager 12. Ru.

At the front position of this imager 12, the imager 12
fiber coupling spring 14 optically connected to
An image intensifier 16 is provided via the image intensifier. This image intensifier 1
Reference numeral 6 performs a shutter action when a shutter drive voltage is applied from the shutter drive circuit 18.

That is, when a desired trigger signal is supplied to the shutter drive circuit 18, a shutter drive voltage is applied from the shutter drive circuit 18 to the image intensifier 16, and only at this time does the shutter effect, that is, the brightness of the subject image change. is increased approximately 20,000 times, and as a result, the image of the subject is captured and recorded on the image pickup device 12.

The image of the subject captured and stored in the image pickup device 12 is read out by an image reading circuit 20, and the image of the subject is displayed on a monitor television 22 based on the read video signal.

Therefore, by photographing a moving object at extremely short time intervals, it is possible to slowly display the movement of the moving object and analyze the behavior of the moving object.

However, in this type of device, when capturing and recording a subject image optically formed by the input lens 10 on the image pickup device 12, it takes an imaging time to scan the subject image. This method has the drawback that the next object image cannot be captured until after the imaging time has elapsed, and the instantaneous behavior of the moving object cannot be determined accurately.

In other words, in a normal television system,
Scanning time is approximately 1/60 second for one screen,
Special ultra-high-speed television cameras also require 1/200 seconds, and therefore the next subject image cannot be scanned until after this time has elapsed, i.e., 1/60 or 1/200 seconds, and ultra-high-speed movement is required. The drawback was that it was not possible to accurately analyze the behavior of the body.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is an object of the present invention to provide a high-speed television camera device that can obtain a plurality of different subject images in basic imaging scanning time units.

Structure of the Invention In order to achieve the above object, the present invention includes a branching means for branching incident light from a subject, a plurality of imagers for capturing a subject image using each of the branched incident lights, and a a plurality of image intensifiers installed at positions that increase the brightness of a subject image and perform an imaging shutter action only when a driving voltage is applied; and a plurality of image memories that store video signals from each of the imagers; It includes a monitor television that displays an image of the subject based on the video signal from the image memory, and a delay circuit that generates a signal delayed by a predetermined time in response to input of a single trigger signal, and The image intensifier is characterized by comprising a drive circuit that applies a drive voltage to each image intensifier.

Embodiment FIG. 2 shows a schematic configuration of a first embodiment of a high-speed television camera device according to the present invention, and the same members as those in the conventional device are given the same reference numerals and their explanations will be omitted.

In the first embodiment, a subject image optically formed by the entrance lens 10 is split into three directions by a splitting means 24 such as a prism. Image intensifiers 16a, 16b, 16c are provided on each output surface of this incident light branching means 24.
The image intensifiers 16a, 16b, 16c are connected to an image pickup device consisting of an image pickup tube or an image pickup element such as a CCD element via fiber couplings 14a, 14b, 14c.
In this embodiment, it is optically connected to image pickup devices 12a, 12b, and 12c configured with image pickup tubes.

Each of the image intensifiers 16a, 1
6b and 16c are corresponding shutter drive circuits 18
By applying shutter drive voltages from a, 18b, and 18c, a shutter action is performed and a subject image is captured and recorded on each image pickup device. and each imager 12
The subject images captured and recorded in a, 12b, and 12c are read out by image reading circuits 20a, 20b, and 20c.

A characteristic feature of the present invention is that shutter drive voltages that are sequentially shifted in time series by a predetermined delay amount are applied to the image intensifiers 16a to 16c provided for each of the plurality of image pickup devices 12a to 12c. This configuration enables a plurality of imaging shutters to operate within a basic scanning imaging time unit of an object image, and as a result, the shutter speed can be repeatedly increased substantially.

In this embodiment, shutter drive circuits 18a, 18 that apply shutter drive voltages to each image intensifier 16a, 16b, 16c are used.
Delay circuits 26a and 26b are provided to drive the circuits b and 18c with a predetermined time delay. That is, when the trigger signal is input, a shutter drive voltage is applied from the shutter drive circuit 18a to the image intensifier 16a, but the delay circuit 26
Due to the delay effect of the shutter drive circuit 26b, a shutter drive voltage shifted by a predetermined time is applied to the image intensifier 16b from the shutter drive circuit 18b, and due to the delay effect of the delay circuit 26c, the shutter drive voltage is applied to the shutter drive circuit 18.
A further delayed shutter drive voltage is applied from c.

In this case, from the time when the shutter drive circuit 18a outputs the shutter drive voltage, the shutter drive circuit 1
8c until the shutter drive voltage is output is set to be shorter than the basic scanning imaging time unit for capturing and recording the optically formed subject image in the imager 12a. In the example, during the scanning imaging time of the imager 12a, the image intensifier 16b and the image intensifier 16c perform an image shutter operation, and the imagers 12b, 1
2c, a subject image shifted by a predetermined time is captured and recorded.

The subject images captured and recorded on each of these imagers 12a, 12b, 12c are
Image reading circuits 20a, 20 corresponding to b, 12c
The image memories 28a, 28 to which the read video signals correspond
b and 28c, respectively.

Each video signal recorded in the image memories 28a, 28b, and 28c is transmitted to an image analysis device 3 such as a computer by operating a selection switch 30.
2, various behaviors such as velocity and acceleration of the moving object are analyzed by the desired calculation operation of the image analysis device 32, and the analysis results are displayed on the analysis monitor television 34. Become.

Therefore, in this embodiment, it is possible to perform a shutter action for capturing images of other objects during the image capturing and recording time of one image capturing device. While the state shown in Fig. 3a is being imaged, the image of the subject at the time when ΔT ₁ has elapsed from the start of this imaging recording is recorded by the imager 12b as Fig. 3b;
In c, when Δt ₂ further passes from this FIG. 3 b, that is, from the state of FIG. 3 a, Δt ₁ +Δt ₂
The object image of the moving body after the time period has elapsed is captured and recorded.

Therefore, the behavior of the moving object can be analyzed by selectively extracting the video signals of these object images from the image memories 28a, 28b, and 28c and performing arithmetic analysis on the image analysis device 32. For example, the behavior of the moving object can be analyzed. It is possible to find the position of the center of gravity and find the speed of the moving body based on the displacement of this center of gravity.
Furthermore, it is also possible to determine the acceleration from the difference in the moving speed of the moving body. Furthermore, it becomes possible to perform various analyzes such as focusing on an arbitrary point in the subject image and determining the moving speed and acceleration of that point, or determining the correlation of a moving object with a certain reference parameter.

In the device of this embodiment, each output end of the incident light branching means 24 and the image intensifier 1
A red filter 36a, a green filter 36b, and a blue filter 36 are connected between 6a, 16b, and 16c, respectively.
c, and each imager 12a, 12b, 1
It is also possible to use this apparatus as a color monitor television by providing a television image synthesis circuit 38 for mixing the imaged and recorded video signals in 2c.

In this case, the shutter drive circuit 18
b, 18c to delay circuits 26b, 26
A changeover switch 39 is provided for switching from the output signal of the output signal C to a trigger signal, and by switching the changeover switch 39 to the trigger signal side, each imager 12
The same subject image with no time lag is captured and recorded in a, 12b, and 12c, and by performing desired synthesis processing on this video signal in the television screen synthesis circuit 38, the monitor television 22 can display a normal color display. becomes.

FIG. 4 shows a second embodiment of the high-speed television camera device according to the present invention, and the same members as those in the first embodiment are given the same reference numerals and their explanations will be omitted.

The difference between this second embodiment and the first embodiment is as follows:
The incident light branching means 24 is constructed from a half mirror.

That is, in the second embodiment, in order to accurately capture a subject image on the plurality of imagers 12a, 12b, 12c, the incident light from the subject that is focused by the input lens 10 is collimated by the auxiliary lens 40. Convert the parallel rays into light rays and pass them through the half mirror 42a
~ 42e and branch to each imager 12a, 12
The light is supplied to imaging lenses 44a, 44b, 44c, and 44d arranged opposite to each other. This image is then captured and recorded in each of the imagers 12a to 12d.

Therefore, in the second embodiment, as a result of parallel rays being incident on each of the imaging lenses 44a to 44d via the half mirror, these imaging lenses 44a to 44d
~44b to adjust the corresponding imagers 12a~12
The subject image can be accurately formed at d.

In addition, as a result of the configuration in which the incident light from the subject is split by a half mirror, it is easy to split the incident light from the subject into multiple parts as necessary. Imaging time can be apparently divided into multiple parts, and as the number of branches increases, the apparent shutter repetition speed can be further increased, making it possible to accurately analyze the behavior of a moving object. , it is possible to track temporal changes in supersonic phenomena on the microsecond order, which was impossible with conventional devices.

Effects of the Invention As explained above, according to the present invention, it is possible to perform a plurality of shutter operations within the basic scanning imaging time unit of the imager, thereby increasing the apparent shutter repetition speed. , it is possible to accurately analyze the behavior of a moving object.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a conventional high-speed television camera device, FIG. 2 is a schematic configuration diagram of a first embodiment of the high-speed television camera device according to the present invention, and FIG.
Figures a to c are explanatory diagrams showing subject images captured and recorded on each imager during the imaging scanning time in the apparatus of the present invention, and Figure 4 is a schematic diagram of a second embodiment of the high-speed television camera apparatus according to the present invention. FIG. 12, 12a to 12d...imaging device, 16, 16
a~16d...Image intensifier, 2
4... Branching means, 26b to 26d... Delay circuit,
28a-28d...image memory, 32...image analysis device, 34...analysis monitor television.

Claims (1)

[Claims] 1. Branching means for branching incident light from a subject;
A plurality of imagers capture a subject image using each branched incident light, and a plurality of imagers are provided at the incident position of each imager and perform an imaging shutter action by increasing the brightness of the subject image only when a driving voltage is applied. an image intensifier, a plurality of image memories that store video signals from each of the image pickup devices, a monitor television that displays a subject image based on the video signals from the image memories, and a single trigger signal input. A high-speed television camera device comprising: a delay circuit that generates signals shifted by a predetermined time; and a drive circuit that applies a drive voltage to each of the image intensifiers in accordance with the signals. .