JP2011030056A - Video signal processing apparatus, and camera system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video signal processing apparatus capable of correcting a level error that may occur, e.g., when converting a high-definition television video (HDTV) signal into a video (SDTV) signal of an NTSC level by a television system converter. <P>SOLUTION: In a video signal processing apparatus 13 which processes an HDTV signal, a conversion means 21 converts the inputted HDTV signal into an SDTV signal, a detection means 22 detects an error between channels that may occur in the conversion by the conversion means, and a correction means 23 corrects the error detected by the detection means for the SDTV signal converted by the conversion means. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a video signal processing apparatus and a camera system, and in particular, a high definition television (HDTV) signal is an NTSC (National Television System Committee) level video (SDTV: Standard Definition Television) signal by a television system converter. The present invention relates to a technique for correcting a level error that occurs when conversion is performed.

For example, in a terrestrial digital broadcasting system, a multi-standard television camera is used as a broadcasting camera.
A high-definition video (HDTV) signal from a multi-standard television camera system apparatus is converted to an NTSC level video (SDTV) signal by a television system converter.

JP-A-7-2127790

  However, it has not been conventionally done to correct the level error that occurs when converting the above HDTV signal to SDTV signal. Such a level error appears remarkably in the black balance, white balance, gamma balance, etc. of the SDTV signal, and a level error with the HDTV signal has occurred.

As a specific example, when processing with 10 bits (bits), in the conversion from HD-SDI (Serial Digital Interface) to SD-SDI, an error (color difference) between RGB channels (color difference) is caused by pixel number line conversion or matrix conversion. For example, a 10-bit bottom bit error) occurs.
For example, when an HDTV signal is converted to an SDTV signal, an error occurs because the number of scanning lines is reduced.

In matrix conversion (transmission matrix conversion), conversion is performed between Y (luminance), Pb (blue color difference), Pr (red color difference) and RGB. In general, luminance signal matrices are HDTV and SDTV. Different.
For example, the HDTV and SDTV video signal conversion matrix is Y = 0.701G + 0.087B + 0.212R for HDTV and Y = 0.588G + 0.114B + 0.299R for SDTV. Here, R corresponds to red, G corresponds to green, and B corresponds to blue.

  The present invention has been made in view of such conventional circumstances, and corrects a level error that occurs when a high-definition video (HDTV) signal is converted to an NTSC level video (SDTV) signal by a television system converter. It is an object of the present invention to provide a video signal processing apparatus and a camera system that can be used.

In order to achieve the above object, the present invention is configured as follows in a video signal processing apparatus for processing HDTV signals.
That is, the conversion means converts the input HDTV signal into an SDTV signal. The detecting means detects an error (for example, level error) between channels (for example, R, G, B) generated in the conversion by the converting means. The correcting unit corrects the error detected by the detecting unit with respect to the SDTV signal converted by the converting unit.
Therefore, for example, it is possible to correct a level error that occurs when a high-definition video (HDTV) signal is converted into an NTSC level video (SDTV) signal by a television system converter.

Here, various methods may be used as a method for converting the HDTV signal into the SDTV signal.
Error detection and correction are performed for each balance such as black balance, white balance, and gamma balance, for example.

In order to achieve the above object, the present invention is configured as follows in a camera system having a camera that acquires an HDTV signal (for example, by shooting a video) and a video signal processing device that processes the HDTV signal. .
That is, in the video signal processing device, the conversion means converts the HDTV signal input from the camera into an SDTV signal, the detection means detects an error between channels generated in the conversion by the conversion means, and the correction means The error detected by the detecting means is corrected for the SDTV signal converted by the converting means.
Therefore, for example, it is possible to correct a level error that occurs when a high-definition video (HDTV) signal is converted into an NTSC level video (SDTV) signal by a television system converter.

The camera system according to the present invention has the following configuration as a configuration example.
That is, in the video signal processing apparatus, the instruction receiving unit receives an instruction for correcting an error between channels. In addition, the instruction output means outputs the instruction received by the instruction receiving means to the camera. In addition, the control unit causes the detection unit and the correction unit to execute processing in response to the instruction received by the instruction receiving unit.
In the camera, the correction processing unit corrects the error between channels with respect to the HDTV signal acquired by the camera in response to an instruction for correcting the error between the channels input from the video signal processing device. (For example, error detection and correction processing).
Accordingly, the error correction process for the SDTV signal in the video signal processing apparatus can be executed in conjunction with the error correction process for the HDTV signal in the camera.

Here, as a method of receiving an instruction by the video signal processing device, for example, a method of receiving an instruction transmitted from a remote device (remote device) operated by a person may be used, or the video A method may be used in which a key or the like provided on the signal processing device is operated by a person (directly) to receive an instruction.
Also, the instruction received by the video signal processing apparatus and the instruction when it is sent to the camera do not necessarily have to be completely the same, and may be converted on the signal format.
The instruction for correcting the error between channels is given for each balance such as black balance, white balance, and gamma balance, for example.

  As described above, according to the present invention, for example, a level error generated when a high-definition video (HDTV) signal is converted into an NTSC level video (SDTV) signal by a television system converter can be corrected.

It is a figure which shows the structural example of the multistandard television camera system apparatus which concerns on one Example of this invention. It is a figure which shows the structural example of the camera control unit which concerns on one Example of this invention. (A), (b), (c) is a figure which shows an example of the mode of conversion from an HDTV signal to an SDTV signal, (d) shows another example of the mode of conversion from an HDTV signal to an SDTV signal. FIG. (A) is a figure which shows an example of the CH level of the HDTV signal after performing auto black balance, (b) and (c) show an example of the CH level of the SDTV signal after performing auto black balance. FIG.

Embodiments according to the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration example of a multi-standard television camera system apparatus according to an embodiment of the present invention. This configuration example is similar to a general system system.
In the system of this example, a multi-standard TV camera 11 exists in the shooting studio 1, and a camera control unit (CCU) 13, a color monitor 14, and a remote control unit (RCU) 15 exist in the auxiliary adjustment room 2. Existing. The multi-standard television camera 11 and the camera control unit 13 are connected via an optical cable 12, and the camera control unit 13 is connected to a color monitor 14 and a remote control unit 15.

An outline of operations performed in the system of this example will be described.
A high-definition video (HDTV) signal shot by the multi-standard television camera 11 installed in the shooting studio 1 is sent to the camera control unit 13 installed in the sub-adjustment room 2 through the optical cable 12.
Here, the multi-standard television camera 11 can convert a plurality of methods, and in this example, the material for the television program is photographed.
In this example, HDTV signals of Y, Pb, and Pr (luminance + color difference) are transmitted to the optical cable 12.

The HDTV signal sent to the camera control unit 13 is output to the color monitor 14 and an image related to the signal is displayed on the screen. Further, the SDTV signal obtained by converting the HDTV signal to the NTSC level by the television system converter by the camera control unit 13 is also output to the color monitor 14 and the video related to the signal is displayed on the screen.
Here, for example, a person who adjusts the black balance or the like can make adjustments by looking at the waveform displayed on the screen of the color monitor 14.

A control signal controlled by the remote control unit 15 is sent to the multi-standard television camera 11 via the camera control unit 13 and the optical cable 12, and controls the camera head according to the control signal. Thus, the video (HDTV and SDTV) signal changes according to the control item of the control signal.
Here, the remote control unit 15 can be operated by, for example, a user (person) to control the multi-standard television camera 11 and the camera control unit 13.

FIG. 2 shows a configuration example of the camera control unit 13 according to one embodiment of the present invention, and also shows the multi-standard television camera 11 and the remote control unit 15.
The camera control unit 13 of this example includes a television system converter 21 having a scan conversion circuit 31 and a matrix conversion circuit 32, a level detection circuit 22, a correction amount adjustment circuit 23, and a CPU (Central Processing Unit) 24. Yes.

An example of the operation performed in the camera control unit 13 of this example is shown.
An HDTV signal photographed by the multi-standard television camera 11 is input into the camera control unit 13 as an HDTV signal area. The input HDTV signal is divided into an HDTV signal that is output as it is and an HDTV signal that is input to the television system converter 21.
Here, in this example, the HDTV signal is represented by Y, Pb, and Pr.

The television system converter 21 converts the HDTV signal into an NTSC level SDTV signal.
Specifically, the HDTV signal (FIG. 3A) input to the TV system converter 21 is converted in the horizontal (H) direction by the scan conversion circuit 31, and the 16: 9 video is displayed on the screen. Both sides are cut and processed to output 4: 3 video on a 16: 9 monitor (FIG. 3 (b)), and vertical (V) direction conversion is also performed, resulting in a 4: 3 monitor. Is converted to output 4: 3 video (FIG. 3C). Alternatively, conversion is performed so that a 4: 3 monitor outputs 16: 9 video (FIG. 3D). The converted signal is input to the matrix conversion circuit 32.

Here, FIG. 3A shows an example of an image based on the HDTV signal input to the television system converter 21. FIG. 3B shows an example of the video shown in FIG. 3A in which both sides are cut by side cropping. FIG. 3C shows an example of 4: 3 video (SDTV signal) on a 4: 3 monitor.
FIG. 3D shows an example of 16: 9 video (SDTV signal) on a 4: 3 monitor (letter box).

The matrix conversion circuit 32 performs transmission matrix conversion on the signal input from the scan conversion circuit 31 in the SDTV signal area, and outputs the result to the level detection circuit 22 and the correction amount adjustment circuit 23.
Here, in this example, in the conversion of the transmission matrix, conversion from Y, Pb, Pr for HDTV signals to Y, Pb, Pr for SDTV signals is performed.
Such processing in the television system converter 21 causes an error due to conversion in the SDTV signal as compared with the HDTV signal.

With reference to FIGS. 4A, 4 </ b> B, and 4 </ b> C, an example of the error is shown by taking the auto black balance as an example.
FIG. 4A shows an example of the CH (channel) level of the HDTV signal after performing the auto black balance. There are R channel, G channel, and B channel as channels.
FIG. 4 (b) shows an example of the CH level of the SDTV signal after executing the auto black balance, and FIG. 4 (c) shows an example of an enlarged version thereof.

As shown in FIGS. 4A, 4B, and 4C, in this example, there is no error in the black balance of the HDTV signal, and there is an error in the black balance of the SDTV signal. The reason for this is that, since the auto black balance processing itself performed in the multi-standard TV camera 11 is performed on the HDTV signal, an error does not occur in the HDTV signal, but an error due to the TV system conversion in the SDTV signal. This is because of this.
Here, black balance has been described as an example, but the same applies to white balance, gamma balance, and the like.

In this example, a level detection circuit 22 and a correction amount adjustment circuit 23 are provided to correct this error, and these are controlled by the CPU 24 in the camera control unit 13.
The CPU 24 detects the level by the level detection circuit 22 to detect the level error between the channels of the SDTV signal input from the television system converter 21, and the television system converter by the correction amount adjustment circuit 23. The detected level error is corrected with respect to the SDTV signal input from 21, and the SDTV signal is output.

  In this example, for each balance such as black balance, white balance, and gamma balance, the level (error) level is detected by the level detection circuit 22, and the presence of the error is detected (recognized) by the CPU 24. For example, Pb and Pr are adjusted by the amount adjusting circuit 23 so that the error is balanced (the error is reduced).

At this time, in this example, a control signal such as auto black balance is input from the remote control unit 15 to the multi-standard television camera 11 via the CPU 24. This control signal is an instruction for causing the multi-standard TV camera 11 to execute auto black balance or the like on the HDTV signal, and the camera control unit 13 detects a level error such as black balance in conjunction with this control signal. And the process which correct | amends is performed. As described above, the level error can be corrected in conjunction with auto control such as auto black balance, auto white balance, and auto gamma balance.
Note that the error correction instruction (control signal) from the remote control unit 15 for each balance and the error detection and error correction for each balance are, for example, one by one (arbitrary or predetermined order). To be done.

  Here, in this example, the configuration example including the level detection circuit 22 is shown. However, as another configuration example, it is understood that the error amount (detected by the level detection circuit 22) is a fixed value. In such a case, the level detection circuit 22 may not be provided, and the SDTV signal may be output by setting the fixed value in the correction amount adjustment circuit 23 without providing the level detection circuit 22. Is possible.

As described above, in the multi-standard television camera system apparatus of this example, the level error generated when the high-definition video (HDTV) signal is converted into the NTSC-level video (SDTV) signal by the television system converter 21 is corrected, so It is possible to prevent level errors such as black balance, white balance, and gamma balance between the video (HDTV) signal and the NTSC level video (SDTV) signal.
Specifically, the camera control unit 13 inputs an HDTV signal and converts it into an SDTV signal, detects an error between channels (R, G, B) generated at the time of the conversion, and detects between the detected channels. The error is corrected for the SDTV signal (for example, the color difference of the SDTV signal is corrected).

Further, in this example, an error such as black balance can be corrected for the SDTV signal in conjunction with the control signal for the HDTV signal from the remote control unit 15.
Specifically, the camera control unit 13 receives an instruction for correcting an inter-channel error from the remote control unit 15 (or directly from a user or the like as another configuration example), and receives the instruction as a multi-standard. The multi-standard television camera 11 corrects the inter-channel error of the HDTV signal (captured video signal) in response to receiving the instruction, and the camera control unit 13 also sends the HDTV signal. Is converted into an SDTV signal, the error between channels is corrected.

  In this way, in this example, after the black balance, white balance, gamma balance, etc. of the HDTV signal are respectively adjusted by the multi-standard TV camera 11, the camera control unit 13 converts the HDTV signal to the SDTV by the TV system converter 21. The level error that occurs when converted to a signal is corrected. As a result, the level error of the HDTV signal and the SDTV signal converted to the NTSC level by the television system converter 21 is eliminated by correction.

In the camera control unit 13 (an example of the video signal processing apparatus) of this example, a conversion means for converting an HDTV signal into an SDTV signal is configured by the function of the television system converter 21 having the scan conversion circuit 31 and the matrix conversion circuit 32. The error detection means for the SDTV signal is configured by the function of the level detection circuit 22, the error correction means for the SDTV signal is configured by the function of the correction amount adjustment circuit 23, and the CPU 24 is connected to the remote control unit 15. The instruction receiving means is configured by the function of receiving an instruction for balance adjustment from the CPU 24. The instruction output means is configured by the function of the CPU 24 outputting the instruction to the multi-standard television camera 11, and the CPU 24 responds to the reception of the instruction. Process according to the instructions. Control means is constituted by the function of controlling so as to be executed by Le detecting circuit 22 and the correction amount adjusting circuit 23.
In addition, in the multi-standard camera 11 (an example of the camera) of this example, in response to the input of the above-described instruction, a balance adjustment process (for example, error detection and correction process) related to the HDTV signal according to the instruction. The correction processing means is configured by the function to execute ().

Here, the configuration of the system and apparatus according to the present invention is not necessarily limited to the configuration described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various systems and devices.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
In addition, as various processes performed in the system and apparatus according to the present invention, for example, the processor executes a control program stored in a ROM (Read Only Memory) in hardware resources including a processor and a memory. A controlled configuration may be used, and for example, each functional unit for executing the processing may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM storing the control program, and the program (itself). The processing according to the present invention can be performed by inputting the program from the recording medium to the computer and causing the processor to execute the program.

  1 .... Shooting studio, 2 .... Sub-adjustment room, 11 .... Multi-standard TV camera, 12 .... Optical cable, 13 .... Camera control unit (CCU), 14 .... Color monitor, 15 .... Remote control unit (RCU) ) 21 .. TV system converter 22.. Level detection circuit 23.. Correction amount adjustment circuit 24... CPU 31.. Scan conversion circuit 32.

Claims (3)

In a video signal processing apparatus for processing HDTV signals,
Conversion means for converting an input HDTV signal into an SDTV signal;
Detecting means for detecting an error between channels generated in the conversion by the converting means;
Correction means for correcting the error detected by the detection means with respect to the SDTV signal converted by the conversion means;
A video signal processing apparatus comprising: In a camera system having a camera that acquires an HDTV signal and a video signal processing device that processes the HDTV signal,
The video signal processing device includes: a conversion unit that converts an HDTV signal input from the camera into an SDTV signal;
Detecting means for detecting an error between channels generated in the conversion by the converting means;
Correction means for correcting the error detected by the detection means with respect to the SDTV signal converted by the conversion means,
A camera system characterized by that. The camera system according to claim 2,
The video signal processing apparatus includes an instruction receiving unit that receives an instruction to correct an error between channels;
Instruction output means for outputting the instruction received by the instruction receiving means to the camera;
Control means for executing processing by the detecting means and the correcting means in response to the instruction being accepted by the instruction accepting means,
The camera executes a process of correcting an error between channels on the HDTV signal acquired by the camera in response to an instruction for correcting the error between the channels input from the video signal processing device. With correction processing means,
A camera system characterized by that.

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