JPS62260274A - Television camera - Google Patents

Abstract

PURPOSE:To photograph an object moving at high speed with high image resolution by discontinuing the writing operation of the photoelectric conversion signal to a memory means when the prescribed change is detected with said conversion signal. CONSTITUTION:The photoelectric conversion signals are obtained when the objects 2a and 2b moving at high speed are photographed by a solid-state image pickup element 11 serving as a photoelectric conversion means. These photoelectric conversion signals are stored in a memory means 6. Thus the storage contents of the means 6 are rewritten by the change of the photoelectric conversion signal. Then the writing operation is discontinued to the means 6 by the detection signal received from a detecting circuit 12 when the object 2a moves to a prescribed position within a viewfield 10a and then the photoelectric conversion signal of the means 6 has a change in a prescribed address. In such case, the picture of the object 2a shot at a prescribed position is stored in the means 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a television camera that can capture images moving at high speed with high resolution.

(Prior Art) In a solid-state image sensor constituting a conventional television camera, a large number of photoelectric conversion means arranged in a matrix are individually connected to an X-designation line in the same column via switch means. The control input terminals of are connected to the Y designation line for each row.

The photoelectric conversion signal of the photoelectric conversion means is read into the shift register for each row by a scanning pulse applied to the Y designation line, and is configured to be parallel-to-serial converted and read out as serial data. And N.T.
In an SC type television camera, serial data of photoelectric conversion signals for each row is read out during one horizontal scanning period, and the vertical scanning frequency is set to approximately 60 Hz.

Photographing a subject moving at high speed using this conventional television camera will be described with reference to FIGS. 3 and 4. FIG. 3 is a block diagram of photographing by a conventional television camera, and FIG. 4 is a flowchart for explaining the photographing operation.

In FIG. 3, objects 2a, 2b- sequentially pass through the field of view la of the television camera 1 at high speed. Then, the sensor 3 detects that one of the objects 2a2b, - has come to the center of the field of view, and drives the flash 4 in synchronization with vertical scanning, and operates the vertical synchronization signal of the television camera 1 to detect, for example, the object 2a. to photograph. Then, the photoelectric conversion signals of the solid-state image sensor included in the television camera 1 are A/D converted and sequentially read out and stored in the image storage means 5, and the data in the image storage means 5 is stored in the central processing unit (hereinafter referred to as CPU).
6, etc., and appropriate image processing is performed. As shown in FIG. 4, it takes 1/60 second, or 33 m5, from the time the sensor 3 detects the subject 2a to the time the data is stored in the image storage means 5.

(Problems to be Solved by the Invention) As mentioned above, <In the conventional television camera 1, it takes 33m5 of time to store data of one image in the image storage means 5, and additional time for image processing by the CPU 6. is necessary.

Therefore, the subjects 2a and 2b- are in the field of view l of the television camera 1.
If you pass within a at intervals of 33m5 or less, then the distance shown in Figure 5 (
Even if you photograph the subject 2a the first time as shown in A), and then try to photograph the subject 2b the second time, the subject 2b has already passed within the field of view la, as shown in Figure 5 (B), and the photograph cannot be taken completely. Can not. Therefore, as shown in FIGS. 6(A) and 6(B), the field of view 1a of the television camera 1 is enlarged so that at least the subject 2a is photographed in the first photographing, and at least the subject 2b is photographed in the second photographing. It is configured as follows. In addition, in this shooting, the subjects 2a and 2b within the field of view la
The television camera 1 performs wL shadows regardless of its position.

This enlargement of the field of view 1a of the television camera 1 is based on the object 2a.
There is a problem in that the image of 2b .

An object of the present invention was to solve the above-mentioned disadvantages of the conventional television camera, and the purpose of the present invention is to capture one image at high speed using a solid-state image sensor that is provided with storage means that individually correspond to a large number of photoelectric conversion means. To provide a television camera capable of storing data in a storage means and photographing a subject moving at high speed with high resolution.

(Means for Solving the Problems) In order to achieve the above object, the television camera of the present invention has a television camera in which photoelectric conversion signals from a large number of photoelectric conversion means arranged in a matrix are individually transmitted to bait photoelectric conversion means. a solid-state image sensor, which is written in a large number of storage means provided correspondingly to the photoelectric conversion signal, and is provided with a stop means for stopping writing of the photoelectric conversion signal to the storage means; and a preset address of the storage means. a detection circuit for detecting a predetermined change in a face-to-key nine-den conversion signal written into a, the detection signal of the detection circuit controls the stop means, and the detection signal is output. The present invention is configured to store the actual image in the storage means.

(Function) Since photoelectric conversion signals from a large number of photoelectric conversion means arranged in a matrix are individually written to a large number of storage means, and a solid-state image sensor is provided with a stop means for stopping the writing, 1. The time it takes for data of one image to be stored in the storage means is extremely short compared to conventional NTSC TV cameras, making it possible to take pictures more frequently, allowing you to capture fast-moving objects in your field of view. It is possible to take images with high resolution without enlarging the image. Also, the detection signal of the television camera is detected by the detection signal of the detection circuit that detects a preset change in the charge conversion signal stored in the preset address of the storage means. Since shadows are controlled, the subject can always be photographed at a fixed position within the field of view without the need for a sensor to detect the subject.

(Description of Examples) Examples of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a block diagram of photographing by the television camera of the present invention, and FIG. 2 is a flowchart for explaining the photographing operation.

First, to briefly explain the solid-state image sensor that constitutes the television camera of the present invention, a large number of photoelectric conversion means are arranged in a matrix, and a large number of storage means are provided corresponding to each of these photoelectric conversion means. , the binary photoelectric conversion signals outputted from the photoelectric conversion means are immediately written into the storage means, and the memory is rewritten. Stopping means for stopping writing of photoelectric conversion signals to the storage means is provided between the photoelectric conversion means and the storage means. When this stopping means is controlled to stop writing, the immediately preceding photoelectric conversion signal is held in the storage means. The storage means can then be accessed so that data at individual addresses can be read. Such a solid-state image sensor is commercially available from Micron Technology Co., Ltd. under the trade name Optic RAM, for example.

The television camera 10 of the present invention uses such a solid-state image sensor 11.
It further includes a detection circuit 12 that detects a preset change 1 in the photoelectric conversion signal written in a preset address of the storage means of the solid-state image sensor 11, for example, a change from a white level to a black level. . The subject 2a is moving at high speed.

2b.- are illuminated with high brightness, and the memory in the storage means is rewritten by changes in the photoelectric conversion signal from the photoelectric conversion means of the solid-state image sensor II. Here, when the subject 2a moves to a predetermined position within the field of view 10a and the photoelectric conversion signal of the preset address storage means changes, the detection circuit 12 outputs a detection signal. This detection signal controls the stopping means of the solid-state image sensor 11 to stop writing to the storage means. At this time, an image of the subject 2a captured at a predetermined position is stored in the storage means. Here, the storage means can be aged by 2 ms, which is 1 ms for exposure time and 1 ms for cression. Therefore, as shown in FIG. 2, according to the television camera of the present invention, one image requires a write time of 2 ms and a C for processing the data recorded in the storage means by this writing.
The processing can be performed by saving the image processing time of the PU6. As a result, the subject 2a can be photographed more frequently than the conventional television camera 1, and the subject 2a moves at a higher speed.

2b- to the field of view 10a without enlarging the field of view 10a.
The entire image can be used to capture images with high resolution.

(Effects of the Invention) As explained above, according to the television camera of the present invention,
Photoelectric conversion signals from a large number of photoelectric conversion means arranged in a matrix are individually written to a large number of storage means, and a solid-state image sensor is provided with a stop means for stopping the writing. The time it takes for data to be stored in the storage means is extremely short compared to conventional NTSC TV cameras, making it possible to take pictures more frequently and expanding the field of view for fast-moving subjects. You can take pictures with high resolution without any problems. In addition, since the shooting of the television camera is controlled by the detection signal of the detection circuit that detects a preset change in the photoelectric conversion signal written in the address of the preset storage means, there is no need for a sensor to detect the subject. Moreover, it has the excellent effect of being able to always photograph the subject at a fixed position within the field of view.

[Brief explanation of drawings]

FIG. 1 is a block diagram of photographing by the television camera of the present invention, FIG. 2 is a flowchart for explaining the photographing operation of FIG. 1, and FIG. 3 is a block diagram of photographing by the conventional television camera. FIG. 4 is a flowchart for explaining the photographing operation of FIG. 3;
Fig. 5 is an explanatory diagram when the subject passes within the field of view of the television camera at an interval shorter than 1/60 second, and Fig. 6 is an explanatory diagram when the field of view of the television camera is expanded so that the subject passes within the field of view at 1/60 seconds.
It is an explanatory view in which the passage takes a longer time than 60 seconds. 1.10: TV camera, ll: Solid-state image sensor, 12: Detection circuit. Figure 5

Claims (1)

[Claims] Photoelectric conversion signals from a large number of photoelectric conversion means arranged in a matrix are written into a large number of storage means provided corresponding to the photoelectric conversion means, and the photoelectric conversion signals are written to the storage means. a solid-state imaging device provided with a stop means for stopping writing; and a detection circuit for detecting a preset change in the photoelectric conversion signal written in a preset address of the storage means, A television camera characterized in that the stopping means is controlled by a detection signal of a circuit, and an image obtained when the detection signal is output is stored in the storage means.