JP2004193948A - Format conversion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To apply a format conversion device to a conversion device of a full format, which mutually converts a video signal of HDTV and a video signal of SDTV, for example, and to simplify a configuration much more than a conventional case. <P>SOLUTION: In the device, inputs/outputs of a conversion circuit for the number of pixels 25, a conversion circuit for the number of lines 26 and a color matrix conversion circuit 24 are switched and an order of a processing is switched in accordance with format conversion. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a format conversion apparatus, and can be applied to, for example, a full-format conversion apparatus that mutually converts an HDTV (High Definition Television) video signal and an SDTV (Standard Definition Television) video signal. The present invention switches the input / output of a pixel number conversion circuit, a line number conversion circuit, and a color matrix conversion circuit, and switches the order of processing according to the format conversion, thereby, for example, performing mutual format conversion between SDTV and HDTV. In this configuration, the configuration can be further simplified as compared with the conventional configuration.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a format conversion apparatus, a line number conversion process and a pixel number conversion process are executed to convert the format of a video signal, and the configuration is simplified, for example, in Japanese Patent Application Laid-Open No. 5-130572. An approach has been proposed.
[0003]
However, in practice, in a process of converting a format for converting an HDTV video signal to an SDTV video signal (so-called down-conversion), generally, a line number conversion process is executed after a pixel number conversion process. Conversely, in the process of converting a format for converting an SDTV video signal to an HDTV video signal (so-called up-conversion), a pixel number conversion process is performed after a line number conversion process. As a result, the overall configuration is simplified.
[0004]
That is, in an HDTV video signal, an effective image area is constituted by, for example, 1080 lines and 1920 pixels, and in an SDTV video signal, an effective image area is constituted by, for example, 480 lines and 720 pixels.
[0005]
Accordingly, when the HDTV video signal is converted to the SDTV video signal, if the conversion processing of the number of lines is executed first, the processing of 1920 pixels per line is required in the conversion processing of the number of lines. In a FIR (Finite Impulse Response) filter provided for processing, the capacity of the line memory is increased. Accordingly, in this case, conventionally, the overall configuration is simplified by first executing the pixel number conversion processing to reduce the number of pixels per line and then executing the line number conversion processing.
[0006]
On the other hand, when converting an SDTV video signal to an HDTV video signal, if the pixel number conversion process is performed first, similarly, the line number conversion process requires a 1920 pixel per line process. The memory capacity increases. Thus, in this case, generally, the number of lines is first converted, and then the number of pixels is converted, thereby simplifying the overall configuration.
[0007]
In addition, in a full-format converter 1 for mutually converting an HDTV video signal and an SDTV video signal, for example, as shown in FIG. 3, a line number conversion circuit 2 performs an up-converter process and a down-converter process. In the processing related to the up-converter, the pixel number converting circuit 3 is arranged after the line number converting circuit 2, and in the processing related to the down-converter, the pixel number converting circuit 4 is provided before the line number converting circuit 2. Has been made to be placed.
[0008]
That is, in the conversion device 1, the input interface (input I / F) 5 receives an SDTV video signal SD1 based on SDI (Serial Digital Interface), converts the video signal SD1 into a parallel signal, and outputs the parallel signal.
[0009]
Subsequently, the color matrix conversion circuit 6 performs a matrix operation on the video signal input from the input interface 5, thereby obtaining the color reproducibility of the video signal SD 1 based on the color matrix standardized for SDTV and the color standardized for HDTV. The output is corrected to the color reproducibility by the matrix.
[0010]
On the other hand, an input interface (input I / F) 7 receives an HDTV video signal HD1 by SDI, converts the video signal HD1 into a parallel signal, and outputs the parallel signal.
[0011]
The following pixel number conversion circuit 4 converts the number of pixels per line into the number of pixels of the SDTV video signal for the HDTV video signal HD1 input from the input interface 7, and outputs the converted signal.
[0012]
The line number conversion circuit 2 is configured by an FIR filter, switches the operation to an operator setting, and converts the SDTV video signal SD1 into the HDTV video signal HD2 and outputs the converted video signal from the color matrix conversion circuit 6. The number of lines of the signal is converted into the number of lines of a video signal in HDTV and output. Conversely, when the HDTV video signal HD1 is converted into the SDTV video signal SD2 and output, the number of video signal lines output from the pixel number conversion circuit 4 is converted into the number of video signal lines in the SDTV. And output.
[0013]
The pixel number conversion circuit 3 receives a video signal of the number of lines by HDTV from the line number conversion circuit 2 and converts the number of pixels to output. The output interface (output I / F) 9 converts the output data of the pixel number conversion circuit 3 into serial data and outputs an HDTV video signal HD2 by SDI.
[0014]
The color matrix conversion circuit 10 receives the video signal of the number of lines by the SDTV from the number of lines conversion circuit 2 and performs a matrix operation process to obtain the color reproducibility of the video signal by the color matrix standardized for the HDTV. Corrected color reproducibility by the standardized color matrix is output. The output interface 12 converts the output data of the color matrix conversion circuit 10 into serial data and outputs an SDTV video signal SD2 based on SDI.
[0015]
[Patent Document 1]
JP-A-5-130572
[Problems to be solved by the invention]
By the way, in the format conversion apparatus for such mutual conversion, it is desired to simplify the one-stage configuration.
[0017]
The present invention has been made in view of the above points, and proposes a format conversion device that can further simplify the configuration in the configuration of, for example, mutual format conversion between SDTV and HDTV as compared with the related art. What you are trying to do.
[0018]
[Means for Solving the Problems]
In order to solve this problem, according to the first aspect of the present invention, in a format conversion device for converting a format of a video signal between a first format and a second format, the format conversion device converts the number of pixels according to the first format into a format based on the second format. The number of pixels of the input video signal is converted to the number of pixels, and the number of pixels of the input video signal is converted from the number of pixels of the second format to the number of pixels of the first format by switching operations. A number-of-pixels conversion circuit for converting the number of lines of the input video signal from the number of lines in the first format to the number of lines in the second format, and switching the operation to change the number of lines in the second format From the number to the number of lines in the first format, A line number conversion circuit for changing the color reproducibility of the input video signal from the color reproducibility of the color matrix of the first format to the color reproducibility of the color matrix of the second format; A color matrix circuit for correcting the color reproducibility of an input video signal from the color reproducibility of the color matrix of the first format to the color reproducibility of the color matrix of the first format by switching; A number conversion circuit, a line number conversion circuit, and a switching circuit for switching input / output of the color matrix conversion circuit, wherein the switching circuit converts an input video signal in the first format into a video signal in the second format. When performing the conversion, the color matrix conversion circuit and the line The input / output of the pixel number conversion circuit, the line number conversion circuit, and the color matrix conversion circuit is switched so that the input video signal is sequentially processed by the number conversion circuit and the pixel number conversion circuit. When converting a video signal into a video signal in the first format, the pixel number conversion circuit, the line number conversion circuit, the pixel number conversion circuit to sequentially process the input video signal by the color matrix conversion circuit, The input / output of the line number conversion circuit and the color matrix conversion circuit is switched.
[0019]
In the invention of claim 2, in the configuration of claim 1, the first format is an SDTV format, and the second format is an HDTV format.
[0020]
According to the configuration of claim 1, the input video signal in the first format is converted into the second format by a switching circuit that switches input and output of the pixel number conversion circuit, the line number conversion circuit, and the color matrix conversion circuit. When converting the input video signal by the color matrix conversion circuit, the line number conversion circuit, the pixel number conversion circuit, the pixel number conversion circuit, the line number conversion circuit, the color When switching input / output of a matrix conversion circuit and converting an input video signal in the second format into a video signal in the first format, the pixel number conversion circuit, the line number conversion circuit, and the color matrix conversion circuit The number of pixels so as to sequentially process the input video signal The pixel number conversion circuit, the line number conversion circuit, and the color matrix conversion circuit are commonly used in the first and second formats by switching input and output of the conversion circuit, the line number conversion circuit, and the color matrix conversion circuit. A simple line number conversion circuit and a color matrix conversion circuit corresponding to the side having a smaller number of pixels in the first and second formats by switching the processing order, and converting the video signal in the first format to the second format. Format conversion into a video signal in the second format, and conversely, a video signal in the second format can be converted into a video signal in the first format.
[0021]
According to the configuration of claim 2, in the configuration of claim 1, the first format is an SDTV format, and the second format is an HDTV format. And the HDTV format, the overall configuration can be simplified.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
[0023]
(1) Embodiment FIG. 1 is a block diagram showing a format conversion apparatus according to an embodiment of the present invention. In this format conversion device 21, the same components as those of the format conversion device 1 described above with reference to FIG. 3 are denoted by the corresponding reference numerals, and redundant description will be omitted.
[0024]
The format converter 21 converts the format of the SDTV video signal SD1 in the first format into the HDTV video signal HD2 in the second format and outputs the converted signal, and conversely, the format of the HDTV video signal in the second format. The signal HD1 is converted into an SDTV video signal SD2 in the first format and output.
[0025]
Therefore, the format conversion apparatus 1 inputs the SDTV video signal SD1 by SDI via the input interface 5 and inputs the HDTV video signal HD1 via the input interface 7. It also outputs an SDI SDTV video signal SD2 via the output interface 9, and outputs an SDI HDTV video signal HD2 via the output interface 12.
[0026]
The switching circuits 22 and 23 switch the input and output of the color matrix conversion circuit 24, the pixel number conversion circuit 25, and the line number conversion circuit 26, and convert the SDTV video signal SD1 to the HDTV video signal HD2 and output the converted signal. The input / output of the pixel number conversion circuit 25, the line number conversion circuit 26, and the color matrix conversion circuit 24 are switched so that the input video signal SD1 is sequentially processed by the color matrix conversion circuit 24, the line number conversion circuit 26, and the pixel number conversion circuit 25. When the HDTV video signal HD1 is converted to the SDTV video signal HD2 and output, the pixel number conversion circuit 25, the line number conversion circuit 26, and the color matrix conversion circuit 24 sequentially process the input video signal HD1. Conversion circuit 25, line number conversion circuit 26, Switching the output of the over the matrix conversion circuit 24.
[0027]
Accordingly, in this embodiment, the pixel number conversion circuit 25, the line number conversion circuit 26, and the color matrix conversion circuit 24 are shared by the SDTV to HDTV format conversion and the HDTV to SDTV format conversion, and The configuration of the conversion circuit 26 and the color matrix conversion circuit 24 can be simplified.
[0028]
Therefore, in this embodiment, the color matrix conversion circuit 24 corrects the color reproducibility of the input video signal from the color reproducibility by the SDTV color matrix to the color reproducibility by the HDTV color matrix, and switches the operation. Accordingly, the color reproducibility of the input video signal is corrected and output from the color reproducibility of the HDTV color matrix to the color reproducibility of the SDTV color matrix.
[0029]
The pixel number conversion circuit 25 converts the number of pixels of the input video signal from the number of pixels per line by SDTV to the number of pixels per line by HDTV, and switches the number of pixels per line by HDTV by switching the operation. The number of pixels of the input video signal is converted into the number of pixels per line by SDTV and output.
[0030]
The line number conversion circuit 26 converts the number of lines of the input video signal from the number of lines according to SDTV to the number of lines according to HDTV, and inputs the number of lines according to SDTV from the number of lines according to HDTV by switching the operation. The number of lines of the video signal is converted and output.
[0031]
The switching circuit 22 inputs the video signal SD1 output from the input interface 5 and the video signal output from the line number conversion circuit 26 to the selection circuit 22A, and the selection circuit 22A converts the SDTV video signal SD1 into HDTV video. When the signal is converted into a signal HD2 and output, the video signal SD1 output from the input interface 5 is selected and output to the subsequent color matrix conversion circuit 24, whereas the HDTV video signal HD1 is converted to an SDTV video signal SD2. In the case of format conversion and output, the video signal output from the line number conversion circuit 26 is selected and output to the subsequent color matrix conversion circuit 24.
[0032]
The switching circuit 22 also inputs the video signal HD1 output from the input interface 7 and the video signal output from the line number conversion circuit 26 to the selection circuit 22B, and the selection circuit 22B converts the SDTV video signal SD1 to the HDTV signal. When the video signal HD2 is format-converted and output, the video signal output from the line number conversion circuit 26 is selected and output to the subsequent pixel number conversion circuit 25, whereas the HDTV video signal HD1 is converted to an SDTV video signal. In the case of converting the format to SD2 and outputting, the video signal HD1 output from the input interface 7 is selected and output to the subsequent pixel number conversion circuit 25.
[0033]
On the other hand, the switching circuit 23 inputs the video signal output from the color matrix conversion circuit 24 and the video signal output from the pixel number conversion circuit 25 to the selection circuit 23A, and the selection circuit 23A outputs the video signal of the SDTV. When the SD1 is converted into an HDTV video signal HD2 and output, the video signal output from the color matrix conversion circuit 24 is selected and output to the line number conversion circuit 26, whereas the HDTV video signal HD1 is converted to an SDTV signal. When the format is converted to the video signal SD2 and output, the video signal output from the pixel number conversion circuit 25 is selected and output to the line number conversion circuit 26.
[0034]
The switching circuit 23 inputs the video signal output from the color matrix conversion circuit 24 and the video signal output from the pixel number conversion circuit 25 to the switch circuits 23B and 23C, respectively, and converts the SDTV video signal SD1 into the HDTV video signal. When format-converted and output to HD2, the switch circuits 23B and 23C are set to an off state and an on state, respectively, and the video signal output from the pixel number conversion circuit 25 is output to the output interface 9 on the HDTV side. Conversely, when the HDTV video signal HD1 is converted into the SDTV video signal SD2 and output, the switch circuits 23B and 23C are set to the ON state and the OFF state, respectively, and the output from the color matrix conversion circuit 24 is performed. The output video signal is output to the output interface 12 on the SDTV side.
[0035]
As a result, as shown in FIG. 2 in comparison with FIG. 1, the format converter 21 converts the format of the SDTV video signal SD1 into the HDTV video signal HD2 (FIG. 2A), and outputs the HDTV video signal HD1. Is converted into an SDTV video signal SD2 (FIG. 2B), and the video signals are sequentially processed in the same processing order as described above with reference to FIG.
[0036]
(2) Operation of the Embodiment In the above configuration, when the format converter 21 converts the format of the SDTV video signal SD1 into the HDTV video signal HD2, the SDTV video signal SD1 based on SDI is parallelized by the input interface 5. After being converted into a signal, the signal is input to the color matrix conversion circuit 24 via the selection circuit 22A of the switching circuit 22. This video signal is subjected to a matrix operation in the color matrix conversion circuit 24 so that the color reproducibility of the SDTV color matrix is corrected to the color reproducibility of the HDTV color matrix. The data is input to the conversion circuit 26, where the number of lines is converted to the number of HDTV lines. Further, the pixel number is input to the pixel number conversion circuit 25 via the selection circuit 22B of the subsequent switching circuit 22, where the number of pixels per line is converted into the number of HDTV pixels, thereby finally converting the video signal into the HDTV format video signal. The signal is converted and output through the switch circuit 23C of the switching circuit 23 and the output interface 9.
[0037]
On the other hand, when the format conversion of the HDTV video signal HD1 into the SDTV video signal SD2 is performed, the HDTV video signal HD1 based on SDI is converted into a parallel signal by the input interface 5 and then passed through the selection circuit 22B of the switching circuit 22. Is input to the pixel number conversion circuit 25, where the number of pixels per line is converted to the number of SDTV pixels. This video signal is subsequently input to the line number conversion circuit 26 via the selection circuit 23A of the switching circuit 23, where the line number is converted to the SDTV line number. Subsequently, the data is input to the color matrix conversion circuit 24 via the selection circuit 22A of the switching circuit 22, and the color reproducibility by the HDTV color matrix is corrected to the color reproducibility by the SDTV color matrix. The signal is finally converted to a signal and output via the switch circuit 23B of the switching circuit 23 and the output interface 12.
[0038]
In these series of processes, in the format conversion device 21, the SDTV is switched by switching between the input and output of the switching circuits 22 and 23, and by switching the operation of the pixel number conversion circuit 25, the line number conversion circuit 26, and the color matrix conversion circuit 24. The number-of-pixels conversion circuit 25, the number-of-lines conversion circuit 26, and the color-matrix conversion circuit 24 used for format conversion from HDTV to HDTV are used for format conversion from HDTV to SDTV. By sharing the circuit 26 and the color matrix conversion circuit 24, the overall configuration can be simplified.
[0039]
Further, in a series of these processes, in the color matrix conversion circuit 24 and the line number conversion circuit 26, in any of the format conversion processes, the SDTV, which is the format on the side where the number of pixels per line is smaller, per line, is used. A matrix operation process and a line number conversion process are executed based on the number of pixels, whereby the configuration of the color matrix conversion circuit 24 and the line number conversion circuit 26 in the format conversion device 21 can be simplified.
[0040]
(3) Effects of the Embodiment According to the configuration described above, the input / output of the pixel number conversion circuit, the line number conversion circuit, and the color matrix conversion circuit is switched, and the processing order is switched according to the format conversion. In the configuration of the mutual format conversion between the SDTV and the HDTV, the configuration can be further simplified as compared with the related art.
[0041]
In particular, in the format conversion related to the mutual conversion between the SDTV and the HDTV as in this embodiment, the order of the processing is such that the color matrix conversion and the line number conversion processing are performed when the number of pixels per line is small. In the case of processing a high-quality video signal having an extremely large number of pixels per line, it is possible to effectively avoid an increase in circuit scale.
[0042]
(4) Other Embodiments In the above-described embodiment, the case where the format conversion of the SDI video signal is described. However, the present invention is not limited to this. For example, the case where the format conversion of a video signal based on an analog signal is performed. For example, the present invention can be widely applied to format conversion of various video signals.
[0043]
Further, in the above-described embodiment, the case where the present invention is applied to the format conversion related to the mutual conversion between SDTV and HDTV has been described. However, the present invention is not limited to this, and the Can be widely applied to conversion.
[0044]
Further, in the above-described embodiment, the case where the number of pixels, the number of lines, and the color matrix are simply converted has been described. However, the present invention is not limited to this, and is widely applied to the case where the number of fields and the number of frames are also converted. can do.
[0045]
【The invention's effect】
As described above, according to the present invention, the input and output of the pixel number conversion circuit, the line number conversion circuit, and the color matrix conversion circuit are switched, and the order of processing is switched according to the format conversion. In the configuration of the mutual format conversion between the two, the configuration can be further simplified as compared with the related art.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a format conversion device according to an embodiment of the present invention.
FIG. 2 is a block diagram for explaining format conversion in the format conversion apparatus of FIG. 1;
FIG. 3 is a block diagram showing a conventional format conversion device.
[Explanation of symbols]
1, 21, a format converter, 2, 26, a line number converter, 3, 4, 25, a pixel number converter, 5, 7, an input interface, 6, 10, 24, a color matrix converter , 9, 12 ... output interface, 22, 23 ... switching circuit

Claims (2)

In a format converter for converting a format of a video signal between a first format and a second format,
The number of pixels of the input video signal is converted from the number of pixels in the first format to the number of pixels in the second format, and the operation is switched to convert the number of pixels in the second format into the first format. A pixel number conversion circuit that converts the number of pixels of the input video signal into the number of pixels according to
The number of lines of the input video signal is converted from the number of lines in the first format to the number of lines in the second format, and the operation is switched to convert the number of lines in the second format into the first format. A line number conversion circuit that converts the number of lines of the input video signal into the number of lines according to
The color reproducibility of the input video signal is corrected from the color reproducibility of the color matrix of the first format to the color reproducibility of the color matrix of the second format. A color matrix circuit for correcting the color reproducibility of the input video signal from the color reproducibility of the color matrix of the first format to the color reproducibility of the color matrix of the first format;
A switching circuit that switches input and output of the pixel number conversion circuit, the line number conversion circuit, and the color matrix conversion circuit,
The switching circuit includes:
When converting the input video signal in the first format into the video signal in the second format, the input video signal is sequentially processed by the color matrix conversion circuit, the line number conversion circuit, and the pixel number conversion circuit. Switching the input and output of the pixel number conversion circuit, the line number conversion circuit, the color matrix conversion circuit,
When converting the input video signal in the second format into a video signal in the first format, the input video signal is sequentially processed by the pixel number conversion circuit, the line number conversion circuit, and the color matrix conversion circuit. A format conversion device for switching between input and output of the pixel number conversion circuit, the line number conversion circuit, and the color matrix conversion circuit. The first format is an SDTV format,
The format conversion device according to claim 1, wherein the second format is an HDTV format.

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