JP3127504B2 - Television camera equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CCD (Charge Coupl).
ed Device) The present invention relates to a television camera device using a solid-state image sensor, and more particularly to a television camera device having a contour correction function of a video signal.

[0002]

2. Description of the Related Art Conventionally, an out-of-green method has been mainly used as a contour correction circuit of a television camera device. The out-of-green contour compensating circuit converts a green light (G) channel signal having the highest light utilization among red light (R), green light (G), and blue light (B) from a contour correction signal. Is generated.

FIG. 3 is a block diagram showing a television camera device provided with a conventional out-of-green type contour correction circuit.

The incident light is split into red light (R), green light (G) and blue light (B) by an optical system (not shown).
These lights are respectively converted into electric signals by a CCD solid-state imaging device (not shown). These signals are applied to terminals 23a,
The signal is supplied to the contour correction circuit via 23b and 23c. In the following description, signals corresponding to red light, green light, and blue light are referred to as an R signal, a G signal, and a B signal, respectively.

A G signal output from a CCD solid-state imaging device (hereinafter, referred to as a CCD device) corresponding to green light is supplied to a delay circuit 20a, a horizontal contour signal generation circuit 21, and a vertical contour signal generation circuit 22. The delay circuit 20a delays the input G signal by one horizontal scanning period and outputs it. This delay signal (hereinafter referred to as 1H delay signal) is
0b, is supplied to the horizontal contour signal generation circuit 21 and the vertical contour signal generation circuit 22. The delay circuit 20b further delays the 1H delay signal by one horizontal scanning period and outputs it. This signal (hereinafter referred to as a 2H delay signal) is provided to a horizontal contour signal generation circuit 21 and a vertical contour signal generation circuit 22.

The horizontal contour signal generation circuit 21 generates a G signal,
A horizontal contour signal is generated based on the H delay signal and the 2H delay signal. Similarly, the vertical contour signal generation circuit 22
Generates a vertical contour signal based on the G signal, the 1H delay signal, and the 2H delay signal. These horizontal contour signals and vertical contour signals are added by an adder 24 and supplied to adders 25a, 25b and 25c.

The adders 25a and 25b are connected to terminals 23
a, an R signal or a B signal given from 23b
4 are added together. As a result, the R 'signal and the B' signal whose contours have been corrected are generated. Further, the adder 25c outputs the 1 output from the delay circuit 20a.
The H delay signal and the contour signal provided from the adder 24 are added. As a result, a G ′ signal whose contour has been corrected is generated. These R ', B' and G 'signals are
It is output via terminals 26a, 26b, 26c, respectively.

In the out-of-green contour correction circuit, only the G 'signal is supplied to the delay circuit 29.
Since it is generated based on the signal delayed by a, the R ′ signal, B ′ signal, and G ′ signal need to be synchronized.
For this reason, in a conventional television camera device provided with an out-of-green type correction circuit, as shown in FIG.
It is arranged shifted from the CD element 27 and the B-channel CCD element 29. That is, each CCD element 27, 2
8 and 29, a plurality of photosensitive units (photodiodes) 30 are arranged in a lattice pattern.
The D element 28 is arranged shifted from the R channel CCD element 27 and the B channel CCD element 29 by an amount corresponding to one horizontal scanning period.

In general, a delay circuit used in an out-of-green type contour correction circuit is provided with a glass delay line.
The signal or the 1H delay signal is delayed by a time corresponding to one horizontal scanning period.

In recent years, as in the case of the high-vision system,
In applications where higher precision and higher image quality are required, digital contour correction in which a video signal is digitized and then processing such as delay and contour correction signal generation is employed.

[0011]

However, the conventional television camera apparatus has the following problems. That is, in the contour correction circuit of the out-of-green system, a glass delay line is used as the 1H delay line, but this glass delay line has a disadvantage that unnecessary radiation (spurious) is generated. For this reason, the contour correction circuit of the out-of-green system has a drawback that the image quality is deteriorated, and the image quality is particularly remarkably deteriorated in the high vision system which requires high image quality.

Therefore, in the case of the high vision system, as described above, a digital type contour compensation circuit for digitizing a video signal and performing processing such as delay is used.
However, this digital type contour correction circuit has a disadvantage that it cannot be used in a battery-driven handy camera because of its large circuit size and large power consumption.

Therefore, an out-of-green type contour correction circuit using a glass delay line is used for outdoor use, and a digital type contour correction circuit for studio use. Conceivable. However, in the out-of-green system, as shown in FIG.
Since it is arranged with a shift corresponding to one horizontal scanning period with respect to the D element 27 and the B channel CCD element 29, there is a shift of one horizontal scanning period between the G signal, the R signal, and the B signal. Occurs, making it impossible to perform digital contour correction.

As described above, the conventional television camera apparatus has a problem that it cannot cope with both the out-of-green scheme and the digital scheme.

By changing the position of the G-channel CCD element, it is conceivable to support both the out-of-green method and the digital type of contour correction method. It is extremely difficult to change the position of the CCD element because it is screwed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-described problems, and is capable of coping with both the out-of-green and digital contour correction methods without changing the position of a CCD element. It is an object to provide a camera device.

[0017]

A television camera device according to the present invention comprises a plurality of CCD solid-state image pickup devices for inputting light separated by an optical system and outputting video signals corresponding to respective colors, and includes an out-of-out device. It corresponds to the green method
One CCD solid-state image sensor is
Offset by one horizontal scanning period
In the television camera device, there is provided a control circuit for generating a control signal by inputting a determination signal for determining that an external digital contour correction circuit is connected, and a delay line for delaying the signal by one horizontal scanning period. A contour signal generating circuit for generating a contour signal for contour correction based on a video signal output from a specific one of the plurality of CCD solid-state imaging devices; and A bypass circuit for transmitting a video signal output from the CCD solid-state imaging device by bypassing the contour signal generation circuit; and outputting the specific C signal when the control signal is output.
A 1H shift circuit for invalidating the vertical transfer pulse applied to the CD solid-state imaging device only once in one effective video period.

[0018]

According to the present invention, a control circuit for generating a control signal based on a discrimination signal is provided, and a bypass circuit converts a video signal output from a specific CCD solid-state imaging device by this control signal into a contour signal. The signal is transmitted by bypassing the generation circuit. The 1H shift circuit invalidates the vertical transfer pulse given to the specific CCD solid-state imaging device by the control signal only once in one valid video period. That is, when the control signal is output from the control circuit,
A video signal is output from the specific CCD solid-state imaging device with a delay corresponding to one horizontal scanning period. This video signal is transmitted via a bypass circuit. Therefore, for example, 1
When one CCD solid-state imaging device is disposed with respect to another CCD solid-state imaging device by a distance corresponding to one horizontal scanning period, the video signals output from these solid-state imaging devices are synchronized. be able to.

On the other hand, when the control signal is not output from the control circuit, the contour signal generation circuit generates a contour correction signal based on the video signal output from the specific CCD solid-state imaging device. In this case, the specific C
The video signal output from the CD solid-state imaging device is delayed by an amount corresponding to one horizontal scanning period. However, since the operation of the 1H shift circuit is disabled and all the vertical transfer pulses are enabled, the contour correction is performed. Video signals can be synchronized.

Incidentally, the specific CCD solid-state imaging device includes:
Preferably, it corresponds to green light. As a result, contour correction using green light having high light use efficiency (that is,
Out-of-green contour correction) becomes possible.

[0021]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

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

The light incident on the optical system 1 is split into red light, green light and blue light by the optical system 1. In the optical system 1, CCD elements 2, 3, and 4 are fixed at predetermined positions, and red light, green light, and blue light are respectively applied to the CCD elements 2, 3, and 4.
In 3 and 4, it is converted into an electric signal. And CCD
An R signal, a G signal, and a B signal are output from the elements 2, 3, and 4, respectively. A drive signal is directly supplied to the CCD elements 2 and 4 from the CCD drive circuit 9, and 1H
A drive signal is supplied from the CCD drive circuit 9 via the shift circuit 18.

The R, G, and B signals output from the CCD elements 2, 3, and 4 are output to video processing circuits 5a and 5a, respectively.
b, 5c. The outputs of the video processing circuits 5a and 5c are directly applied to the video processing circuits 6a and 6c, respectively.
The output of the video processing circuit 5b is supplied directly to the video processing circuit 6b via the bypass circuit 11, or to the contour signal generation circuit 7 having a glass delay line. This switching is performed based on whether a control signal is output from the control circuit 8 or not.

When the output of the video processing circuit 5b is given to the contour signal generating circuit 7, the contour signal generating circuit 7 generates an out-of-green contour correction signal. The contour correction signal is supplied to the video processing circuit 6
a, 6b, 6c.

The 1H shift circuit 18 is a circuit for correcting that the G signal is advanced by one horizontal scanning period as compared with the R signal and the B signal, and is driven by the output of the control circuit 8. That is, when a control signal is given from the control circuit 8, 1
The H shift circuit 18 operates the vertical transfer pulse output from the CCD drive circuit 9 to operate the G channel CCD element 3.
The first vertical transfer in one effective video period is prohibited.

When the digital contour correction circuit 10 is connected to the television camera apparatus according to the present embodiment, the outputs of the video processing circuits 6a, 6b and 6c are supplied to the digital contour correction circuit 10 and the digital contour correction circuit 10 is used. A determination signal is input from the circuit 10. The control circuit 8 outputs a control signal when the determination signal is given, and operates the bypass circuit 11 and the 1H shift circuit 18.

FIG. 2 is a timing chart showing the operation of the present embodiment. Reference numeral A is a timing chart when the out-of-green method is selected, and reference numeral B is a timing chart when the digital method is selected.

When the digital contour correction circuit 10 is not connected, no control signal is given to the control circuit 8, so that no control signal is output from the control circuit 8. Therefore, the 1H shift circuit 18 transmits all the vertical transfer pulses output from the CCD drive circuit 9 to the CCD element 3. Therefore, the transfer pulse given to the CCD element 3 is C
This is the same as the transfer pulse applied to the CD elements 2 and 4.

The G channel signal output from the CCD element 3 is input to a contour signal generation circuit 7 having a glass delay line via a video processing circuit 5b, and a contour signal is output from the contour signal generation circuit 7. You. As a result, signals subjected to contour correction by the out-of-green method are output from the signal processing circuits 6a, 6b, 6c.

On the other hand, when the digital contour correction circuit 10 is connected to the television camera apparatus of the present embodiment, a discrimination signal is given from the digital contour correction circuit 10,
A control signal is output from the control circuit 8. This gives 1
The H shift circuit 18 operates, and the first one pulse of one valid video period becomes invalid as the vertical transfer pulse applied to the CCD element 3. Further, the bypass circuit 11 operates, and the G signal output from the CCD element 3 is transmitted from the video processing circuit 5b to the video processing circuit 6b via the bypass circuit 11 (that is, bypassing the contour signal generation circuit 7). You. As a result, the R signal, the G signal, and the B signal, which have not been contour-corrected and are in phase, are supplied to the digital contour corrector 10 from the video processing circuits 6a, 6b, and 6c.

In this embodiment, as described above, the CCD
It is possible to cope with both the out-of-green method and the digital method of contour correction without changing the positional relationship of the elements. Therefore, in the outdoors, it is possible to obtain an image subjected to contour correction by the out-of-green method built in the camera, and in the studio, it is possible to obtain a high-quality image using a digital method of contour correction. .

[0033]

As described above, in the television camera device according to the present invention, a vertical pulse given to a specific CCD solid-state imaging device based on a control signal output from a control circuit is output once per effective video period. 1H to disable only
Since the shift circuit and the bypass circuit for transmitting the video signal output from the specific CCD solid-state imaging device by bypassing the contour signal generation circuit are provided, the position of the CCD solid-state imaging device can be changed without changing the position of the CCD solid-state imaging device. It is possible to support both the green method and the digital method of contour correction.

[Brief description of the drawings]

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

FIG. 2 is a timing chart showing the same operation.

FIG. 3 is a block diagram showing a television camera device provided with a conventional out-of-green type contour correction circuit.

FIG. 4 is a schematic diagram showing the arrangement of the CCD elements.

[Explanation of symbols]

 Reference Signs List 1; optical system 2, 3, 4, 27, 28, 29; CCD elements 5a to 5c, 6a to 6c; video processing device 7; contour signal generation circuit 8; control circuit 9; drive circuit 10; Bypass circuit 18; 1H shift circuit 20a, 20b; delay circuit 21; horizontal contour signal generation circuit 22; vertical contour signal generation circuit

Claims (2)

(57) [Claims] 1. A plurality of CCD solid-state imaging devices each of which receives light separated by an optical system and outputs a video signal corresponding to each color, so as to support an out-of-green system.
One CCD solid-state image sensor is replaced by another CCD solid-state image sensor
Are shifted from each other by an amount equivalent to one horizontal scanning period.
In the television camera device, a control circuit for generating a control signal by inputting a determination signal for determining that an external digital contour correction circuit is connected, and a delay line for delaying the signal by one horizontal scanning period are provided. A contour signal generating circuit for generating a contour signal for contour correction based on a video signal output from a specific one of the plurality of CCD solid-state imaging devices; and A bypass circuit for transmitting a video signal output from the CCD solid-state imaging device by bypassing the contour signal generation circuit, and the specific CC when the control signal is output.
A television camera device, comprising: a 1H shift circuit that invalidates a vertical transfer pulse applied to a D solid-state imaging device only once in one effective video period. 2. The method according to claim 1, wherein the specific CCD solid-state image pickup device inputs a green light among red light, green light and blue light separated by the optical system and converts the green light into an electric signal. The television camera device according to claim 1, wherein