JPH07177434A - Television camera device - Google Patents

Abstract

PURPOSE:To improve vertical resolution by taking out the electric charge of a CCD in a frame cycle in the case of an object without motion and to improve motion resolution by taking it out in a field cycle in the case of the object with the motion. CONSTITUTION:While the object does not move, the storage electric charge of the CCD 1 is taken out in the frame cycle, noise is cancelled in an S/H circuit 2 and it is processed to a required video signal in a signal processing part 3 and outputted. A picture from the S/H circuit is recorded in a picture memory 4, the motion is detected by comparing the picture with the next picture from the S/H circuit in a motion detection part 5, and the presence of the motion is judged in a judgement part 7 by comparing the picture with a motion judgement reference from a storage part 6. Based on the judgement, the CCD is switched to field cycle storage through a signal take-out control part 8.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a CCD (charge coupled)
The present invention relates to a television camera (hereinafter abbreviated as "camera") device in which a device is used as an image pickup device, and a device for switching a cycle of taking out charge accumulated in a CCD according to a movement of a subject.

[0002]

2. Description of the Related Art A camera device using a CCD as an image sensor includes a frame period accumulation type device for extracting charge accumulated in the CCD at a frame period (1/30 second period) and a field period (1/60 second period). There is a field period accumulation type. The frame cycle accumulation type is C
It takes out the accumulated charge of CD while skipping it one row at a time. Since the accumulation time is 1/30 second, which is longer than the field cycle accumulation method, the resolution of a moving subject, that is, the dynamic resolution is higher than that of the field cycle accumulation method. Worse, on the other hand,
In the field period accumulation type, the charges of the CCD are stored in two columns, for example, two columns adjacent to each other from the upper end of the screen, for example, the first column and the second column, and then the third column and the fourth column. The charges are sequentially taken out at the same time, added and output, returned from the bottom of the screen to the top again, the combination of columns is shifted, and two columns are taken out, such as the second and third columns, and then the fourth and fifth columns. It outputs by adding, and the storage time of each element is 1 / 60th of a second, which is shorter than the frame period accumulation type, so the dynamic resolution is superior to that of the frame period accumulation type, but on the other hand, two rows Since the electric charges of are taken out at the same time, there is a problem that the vertical resolution is poor.

[0003]

A frame cycle accumulation type is used when the camera is used to image only a stationary subject, and a field cycle accumulation type is used when the subject to be imaged is a moving object. If you use, you can make use of the characteristics of each method. However, in the case of both mixed subjects, either one must be sacrificed. In view of such a point, the present invention detects the movement of the subject, takes out and transfers the accumulated charge of the CCD in the frame period when the subject does not move, and when the subject moves, accumulates the charge of the CCD in the field period. It is to provide an automatic switch to retrieve and transfer.

[0004]

In order to solve the above problems, the present invention removes noise from a signal from an image sensor,
In a camera that processes and outputs a required video signal in a signal processing unit, an image memory that stores an image based on a signal from the image sensor and an image read from the image memory are compared with a next image from the image sensor to perform a motion. A motion detection section for detecting a motion, a storage section for storing a motion determination reference, a determination section for comparing a signal from the motion detection section with a signal from the storage section to determine whether there is motion, and taking out a signal from the image sensor. And a control unit for controlling the image memory, the motion detection unit, the storage unit, the determination unit, and the signal extraction control unit. Based on the signal from the unit, the extraction of the signal of the image pickup device is switched from the frame cycle to the field cycle through the signal extraction control unit, and the signal processing unit performs processing based on the extracted signal. There is provided a camera apparatus adapted to.

[0005]

With the above-described structure, in the camera device according to the present invention, when the subject does not move, the charge accumulated in the CCD is taken out at a frame period, and the S / H circuit removes clock noise, etc. It is processed into a video signal and output. At the same time, the image from the S / H circuit is recorded in the image memory, and when the next image is input from the S / H circuit, the motion is detected by comparing this image with the image read from the image memory. When the detected signal is larger than the motion determination standard, the charge accumulated in the CCD is extracted in the field cycle.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a camera device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of essential parts of an embodiment of a camera device according to the present invention. In the figure, reference numeral 1 denotes a CCD, which takes out and outputs the electric charge accumulated by the incident light through the image pickup lens based on a signal from the signal extraction control unit 8. A S / H circuit 2 removes clock noise and the like contained in the signal from the CCD 1. A signal processing unit 3 processes the signal from the S / H circuit 2 into a desired video signal and outputs it.

An image memory 4 stores an image from the S / H circuit 2. A motion detection unit 5 compares the image read from the image memory 4 with the image input next, and detects the difference between the two images, that is, the motion of the subject. A storage unit 6 stores a reference value for motion determination. A determination unit 7 compares the signal from the motion detection unit 5 with the signal from the storage unit 6 to determine that the subject has motion. Based on the signal from the determination unit 7, the signal extraction control unit 8 switches from the field cycle accumulation formula for taking out and transferring the accumulated charges in the CCD 1 in the field period to the frame period accumulation formula for extracting and transferring the accumulated charges in the frame period. Reference numeral 9 denotes a setting unit, which arbitrarily sets a motion determination reference stored in the storage unit 6. Reference numeral 10 is a reference signal generator, which generates a required reference clock signal. A control unit 11 controls each unit.

Next, the operation of the camera device according to the present invention will be described. For example, near the line of the image in FIG.
In a portion where the subject does not move, the signal extraction control unit 8 controls the CCD 1 to perform a frame cycle operation, and the charges of the CCD 1 are taken out one by one in an interlaced manner. Take out to. That is, the accumulated charge of each element of the CCD 1 is
The signal is taken out once every 30ths of a second, input to the S / H circuit 2, the clock noise and the like are removed, and the signal processing unit 3 processes it into a desired video signal and outputs it.

The signal from the S / H circuit 2 is also input to the image memory 4 to record one screen. And S / H
When the next image is input from the circuit 2, the motion detection unit 5 compares this image with the previous image read from the image memory 4. As a result, for example, a signal is output when there is a motion in the subject such as in the range "B" of the line and a difference occurs between the two images. This signal is input to the determination unit 7 via the control unit 11 and compared with the reference level for motion determination read from the storage unit 6. By this comparison, when the signal from the motion detection unit 5 is higher than the reference level of the motion determination, it is determined that there is motion, and the signal extraction control unit 8 causes the CC through the control unit 11.
D1 is switched to the field cycle operation. This allows
The charge stored in the CCD 1 is extracted once every field period, that is, every 1/60 second, and the charge extraction interval of each element of the CCD 1 is shortened, so that the dynamic resolution is excellent.

As described above, there is no difference between the two images in the vicinity of the line in which the object does not move and in the periods "a" and "c" of the line, and the accumulated charge of the CCD 1 is taken out in the frame period and the vertical An image with good resolution is output, and the subject is moving during the period of “b”.
The accumulated charge of 1 is taken out in the field cycle and is output as an image with good dynamic resolution. When changing the standard for switching between the field cycle accumulation type and the frame cycle accumulation type, that is, the criterion for judging the movement, depending on the use of the camera, the setting section 9 sets the criteria. The signal from the setting unit 9 is input to the storage unit 7 via the control unit 11 and is stored in the storage area for the motion determination reference.

[0011]

As described above, according to the camera device of the present invention, when the subject moves, the charge accumulated in the CCD is automatically switched so as to be taken out in the field cycle, so that the dynamic resolution is good. When the subject does not move, it is automatically switched at the frame period, so that the vertical resolution is good, and the advantages of the field period accumulation type and the frame period accumulation type can be combined.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of a television camera device according to the present invention.

FIG. 2 is a conceptual diagram for explaining the operation of the television camera device according to the present invention.

[Explanation of symbols]

 1 CCD (charge coupled device) 2 S / H (sample and hold) circuit 3 signal processing unit 4 image memory 5 motion detection unit 6 storage unit 7 judgment unit 8 signal extraction control unit 9 setting unit 10 reference signal generation unit 11 control unit

Claims (2)

[Claims] 1. A television camera that removes noise from a signal from an image sensor, processes a signal into a required video signal in a signal processing unit, and outputs the image signal, the image memory storing an image of the signal from the image sensor. A motion detection unit that compares the image read from the image memory with the next image from the image sensor to detect motion, a storage unit that stores the motion determination criteria, and a signal from the motion detection unit that is a signal from the storage unit. A comparing unit that determines whether there is motion, a signal extraction control unit that controls whether the signal of the image sensor is extracted in a frame cycle or in a field cycle, the image memory,
A motion control unit, a storage unit, a determination unit, and a control unit that controls the signal extraction control unit. Based on a signal from the determination unit, the signal extraction control unit extracts the signal of the image sensor from the frame cycle to the field cycle. And a television camera device in which the signal processing unit performs processing based on the extracted signal. 2. The television camera device according to claim 1, further comprising a setting unit for setting a criterion for determining whether or not there is a motion, and the criterion for determining the motion stored in the storage unit is arbitrarily set.