JP2591437B2 - High-definition video signal encoding / decoding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-definition moving picture signal encoding / decoding apparatus, and more particularly to a method for coding a high-definition moving picture signal and supplying recording data to a recording / reproducing apparatus. The present invention relates to a high-definition video signal encoding / decoding device for decoding and reproducing a high-definition video signal.

[0002]

2. Description of the Related Art Conventionally, when recording and reproducing a high-definition moving image signal, an input high-definition moving image signal is digitized by an AD converter to generate digital image data, and the digital image data is recorded and reproduced. To the device for recording, and the reproduction output from the recording / reproducing device is
The signal is converted back to an analog high-definition moving image signal by the A-conversion circuit.

Here, the recording / reproducing device is a digital VT.
R or a digital optical disk device, which is composed of an error correction circuit, a modulation / demodulation circuit, a high-bandwidth amplifier, a recording / reproducing head, etc., and records and reproduces digital image data on a magnetic tape or an optical disk medium. As the input high-definition moving image signal, a RGB three-primary-color signal, a component signal including a luminance signal and two types of color difference signals are generally used.

A high-definition moving image signal is a high-quality wide-band signal having 1000 or more scanning lines, and when digitized so as not to impair the quality of the original signal, its bit rate becomes 1 gigabit per second. May exceed.
To support such high-speed and large-volume data,
2. Description of the Related Art A conventional recording / reproducing apparatus for a high-definition moving image signal has a multi-channel circuit or head.

[0005]

As described above, the conventional recording / reproducing apparatus for a high-definition moving image signal has a high bit rate exceeding 1 gigabit per second, and has a large capacity. We are increasing the number of channels for circuits and heads. For this reason, there is a disadvantage that the recording / reproducing device becomes large and the recording / reproducing time is shortened. Also,
Since a recording / reproducing device for the current television system such as the NTSC system or the PAL system cannot be used, a new recording / reproducing device for a high-definition moving image signal must be prepared, which increases the cost.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the bit rate of digital image data input to a recording / reproducing device to a maximum allowable value of the recording / reproducing device, thereby reducing the size of the recording / reproducing device and extending the recording / reproducing time. It is another object of the present invention to provide an encoding / decoding device for a high-definition moving image signal, which makes it possible to utilize a recording / reproducing device for the current television system.

[0007]

An encoding / decoding apparatus for a high-definition moving image signal according to the present invention encodes a high-definition moving image signal and supplies it to a recording / reproducing device. In the high-definition video signal encoding / decoding device for decoding and reproducing the high-definition video signal, an A / D converter for digitizing the high-definition video signal and an output from the A / D converter are provided. A compression encoding section for performing data compression processing on a digital high-definition video signal using only data in a frame to generate compressed data; and a bit rate of the compressed data output from the compression encoding section is determined by the recording / reproduction. A bit rate control unit for controlling the compression / encoding unit so as to be equal to or less than a maximum recording / reproducing allowable bit rate of the device; and a digital data decoder for decoding the compressed data reproduced by the recording / reproducing device. A decompression unit for reproducing the high-quality video signal, have said digital high-definition moving image signal the decompression unit outputs is composed of a D-A converter for analog data
May be .

A high-definition video signal encoding / decoding apparatus according to a first aspect of the present invention encodes a high-definition video signal and supplies it to a recording / reproducing device, and decodes a reproduction output of the recording / reproducing device. A high-definition video signal encoding / decoding device for reproducing the high-definition video signal by digitizing the high-definition video signal;
A compression encoding unit for performing data compression processing on the digital high-definition video signal output from the D conversion unit using only data in the frame to generate compressed data, and the compressed data output by the compression encoding unit; A bit rate control unit that controls the compression encoding unit so that the bit rate of the current television signal is equal to or less than the bit rate when the effective image area is digitized, and the compressed data output by the compression encoding unit. And a format conversion unit for converting the data into a current television format data by inserting the data into an effective image area of the current television system and transmitting the data to the recording / reproducing device; and reproducing data of the current television format reproduced by the recording / reproducing device. A format inverse converter for extracting the compressed data from the effective image area of the A decompression unit for decrypting reproducing said digital high-definition moving image signal, an analog of the digital high-definition moving image signal the decompression unit outputs D-
Composed of a A converter.

Next, in the present invention according to the first aspect of the present invention, when the high-definition video signal comprises a luminance signal and a color-difference signal, the compression-encoding section performs the conversion by the A / D conversion section. Sub-sampling means for performing sub-sampling on the digitized color difference signal to reduce the number of pixels in one frame; and the color difference signal subjected to pixel number reduction processing by the sub-sampling means and the A / D converter. Scan conversion means for receiving each of the digitized luminance signals, changing the temporal order and time-division multiplexing of pixels and outputting the image data in block units, and for the image data output by the scan conversion means A discrete cosine transform means for performing a discrete cosine transform and outputting transform coefficient data, according to a quantization parameter Quantizing means for quantizing the transform coefficient data output by the discrete cosine transform means, and quantizing the data by using a table created in advance in response to the quantized data and the quantization parameter output from the quantizing means. Huffman encoding means for converting data into Huffman encoded data; and fixed bit length output for rearranging the Huffman encoded data output by the Huffman encoding means to have a fixed bit length and outputting compressed data having a fixed bit length. Means, the bit rate control unit, the discrete cosine transform means, based on the transform coefficient data output, so that the sum of the code amount per frame after compression does not exceed a predetermined value. Means for calculating a quantization parameter, wherein the decompression unit performs a data rearrangement process on the input compressed data. A variable bit lengthening means for performing and restoring the variable length Huffman code data, and performing an inverse transformation of the Huffman code using a preset table for the Huffman code data restored by the variable bit lengthening means. Huffman decoding means for restoring the quantization parameter and the quantized data, respectively, and performs inverse quantization processing based on the restored quantization parameter and the quantized data by the Huffman decoding means to convert the transform coefficient data. An inverse quantization means for restoring,
An inverse discrete cosine transform unit for performing an inverse discrete cosine transform process for each block on the transform coefficient data restored by the inverse quantization unit to restore the image data; and an image restored by the inverse discrete cosine transform unit. A scan inverse conversion means for respectively restoring the color difference signal and the digital luminance signal subjected to the pixel number reduction processing from the image data restored by performing a temporal order change of the pixels of the data, and a pixel number restored by the scan inverse conversion means. and performs interpolation processing on the reduced processed the color difference signals is composed of a interpolation processing means for reconstructing the chrominance signals of a predetermined number of pixels
Is also good.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an example of the configuration of the present invention. Here, the input high-definition moving image signal S1 is A-
The D-converter 1, the compression encoder 2, and the bit rate controller 3 control the recording compressed data D6 having a bit rate equal to or less than a predetermined value.
And output to the recording / reproducing device 10. Also,
The reproduced compressed data D8 from the recording / reproducing device 10 is decoded by the decompression unit 6 and the DA conversion unit 7 into a high-definition video signal S6.

The A / D converter 1 samples an input high-definition moving image signal at a frequency of at least twice the signal band, performs quantization processing at 8 bits or more, and converts it into a digital signal. Here, the input high-definition moving image signal S1 is a component signal composed of a luminance signal and two color difference signals. Each signal is digitized and output as a digital high-definition moving image signal S2.

The compression encoding unit 2 receives the digitized high-definition video signal S2, thins out the pixels of the color difference signal, and executes a discrete cosine transform and Huffman encoding to perform data compression processing. At the same time, the quantization is performed in accordance with the quantization parameter P1 calculated by the bit rate control unit 3 to generate the compressed recording data D6 controlled to be equal to or lower than the maximum allowable bit rate of the recording / reproducing device 10. For example,
If the recording / reproducing device 10 can record / reproduce a maximum of 100 megabits of data per second, it generates the recording compression data D6 controlled to 100 megabits per second or less. The bit rate control unit 3 receives the data D2 from the compression encoding unit 2 and generates a quantization parameter P1, which will be described later.

The recording / reproducing device 10 stores the compressed compressed data D6.
After receiving the error correction code and performing modulation processing,
It is recorded on a medium such as a magnetic tape or an optical disk. Further, after performing demodulation processing, error correction processing, and the like on the signal reproduced from the medium, the signal is output as reproduced compressed data D9.

The decompression section 6 performs a decompression process on the reproduced compressed data D9 and outputs a digital high-definition moving image signal S5. This decompression process is a reverse process corresponding to the data compression process. The DA converter 7 converts the high-definition video signal S5 output from the decompression unit 6 into an analog high-definition video signal S6.

Next, the compression encoder 2 and the bit rate controller 3 will be described in detail with reference to FIG.

The luminance signal S2a and the two color difference signals S2b and S2c digitized by the AD converter 1 are input to the compression encoding unit 2, and the color difference signals S2b and S2c are input to the compression encoding unit 2.
2c is supplied to the sub-sampling circuit 21 and the luminance signal S
2a is input to the scan conversion circuit 22.

The subsampling circuit 21 has a function of reducing the number of pixels in one frame by performing subsampling and thinning out pixels. Generally, the color difference signal has a low frequency component with respect to the luminance signal, and is less noticeable even if the high frequency component of the color difference signal is deteriorated. Sub-sampling is performed in any of the horizontal direction, vertical direction, diagonal direction, or a combination thereof,
This is performed after passing through a low-pass filter in order to reduce aliasing distortion. The color difference signal S3 thus thinned out
b and S3c are sent to the scan conversion circuit 22.

The scan conversion circuit 22 converts an interlaced scan (interlaced scan) into a progressive scan (sequential scan), and also converts a line-based scan into a block-based scan. In this case, for example, 8
A small area of about 8 pixels × 8 lines is configured as one block. Further, the luminance signal S2a and the color difference signals S3b, S3
c is time-division multiplexed, converted into one-system recording image data D 1, and output to a DCT (discrete cosine transform) circuit 23.

The DCT circuit 23 receives the recording image data D1 and executes a discrete cosine transform process in block units.
It generates transform coefficient data D2 and outputs it to bit rate control section 3 and delay circuit 24. The delay circuit 24 gives a delay time corresponding to the time when the quantization parameter P1 is calculated in the bit rate control unit 3, and sends the result to the quantization circuit 25 as transform coefficient data D3. The quantization circuit 25 quantizes the transform coefficient data D3 according to the quantization parameter P1, and generates the Huffman encoding circuit 26 as the quantization data D4.
Output to

Incidentally, the bit rate control unit 3 converts the transform coefficient data D2 based on a preset quantization parameter.
Is quantized, the code amount of the quantized data is accumulated in units of one frame, and a quantization parameter P1 for controlling the accumulated value so as not to exceed a predetermined code amount is calculated. Here, the preset code amount is set to be equal to or less than the maximum allowable bit rate of the recording / reproducing device. By controlling the encoding with the quantization parameter P1 in this manner, it is possible to generate the compressed recording data D6 of the recording / reproducing apparatus 10 having a maximum bit rate that is equal to or less than the maximum bit rate.

The Huffman encoding circuit 26 performs a variable length encoding process using a table created in advance according to the quantization parameter P1 and the quantized data D4, and converts the quantized data D4 into Huffman encoded data D5. This table is a code table that assigns one code according to the frequency of occurrence of quantized data and the number of consecutive zero values. For example, for quantized data that becomes a non-zero value after consecutive zeros, , One code having a length determined according to the number of consecutive zeros and a non-zero value thereafter. When values other than zero continue, each value is converted to a code defined in the table. If the remaining quantized data in the same block is all zero, the code data indicating that the coding for this block has been completed is output.

The fixed bit length converting circuit 27 rearranges the Huffman code data D5 of which code length changes so as to have a fixed bit length, and outputs it to the format conversion section 3 as fixed bit length recording compressed data D6. Generally, Huffman code data is a variable length code and contains many invalid bits. For example, if the longest code is 16 bits,
Although a 16-bit bus is provided as a circuit, the effective bits of the Huffman code data may be about 1 to 2 bits, and most of them are invalid bits. Further, when zero or continuous, no valid code is output, so that the data amount cannot be substantially reduced. Therefore, the code length is equalized to, for example, 8 bits, the data is rearranged, and only effective bits are taken out as the recording compression data D6.

The compression encoder 2 performs a compression process using only the pixels in one frame of the digitized high-definition video signal S2. As such a compression processing method, a sub-sampling method in which the number of pixels is reduced by performing pixel thinning after limiting a spatial frequency band, or a coded pixel is predicted by calculation from adjacent pixels in a frame, and the prediction is performed. The prediction encoding method that encodes the difference between the pixel value and the actual pixel value, the screen within one frame is divided into small-area blocks, and orthogonal transform such as discrete cosine transform or Hadamard transform is performed for each block. Orthogonal transform coding method for coding orthogonal transform coefficients, or subband coding method for dividing an image in a frame into a plurality of bands in terms of spatial frequency, thinning out pixels, and coding pixels of each band image. Or a combination of these methods, but any of these methods may be used.

Next, the extension section 6 will be described with reference to FIG.

The variable bit length circuit 31 receives the compressed reproduction data D9 having a fixed bit length, rearranges the data and adds invalid bits, returns the Huffman code, and outputs it as Huffman code data D10. The Huffman decoding circuit 32 inversely converts the Huffman code into a continuous zero and one non-zero value using a table created in advance,
It outputs the quantization parameter P2 and the quantization data D11. The inverse quantization circuit 33 inversely quantizes the quantized data D11 according to the quantization parameter P2, and outputs the result as transform coefficient data D12. The inverse DCT circuit 34 performs a discrete cosine inverse transform process on the transform coefficient data D12 output from the inverse quantization circuit 33 for each block, and outputs reproduced image data D13 in which a luminance signal and a color difference signal are time-division multiplexed. .

The scan inverse conversion circuit 35 separates the luminance signal and the color difference signal from the reproduced image data D13, returns the scan in block units to the scan in line units,
Processing for returning from progressive scan to interlaced scan is performed, and a luminance signal S5a and two color difference signals S4b and S4c are output. By the way, in the sub-sampling circuit 21 of the compression encoding unit 2, since the pixels of the color difference signals S2b and S2c are thinned out, the number of pixels of the color difference signals S4b and S4c is small. For this reason, the interpolation circuit 36 is provided to interpolate the thinned-out pixels with respect to the color difference signals S4b and S4c, and to provide the color difference signals S5b and S5c.
Output as

FIG. 2 is a block diagram showing an embodiment of the first invention of the present invention.

Here, the same components as those of the embodiment of the present invention shown in FIG. 1 are denoted by the same reference numerals. In addition, the above-mentioned
The difference from the example of the configuration of the present invention is that a format conversion unit 4 and a format inverse conversion unit 5 are added.

The input high-definition moving image signal S1 is encoded by the AD converter 1, the compression encoder 2 and the bit rate controller 3 into recording compressed data D6 having a bit rate equal to or less than a predetermined value. Here, the bit rate of the recorded compressed data D6 output from the compression encoding unit 2 is controlled by the bit rate control unit 3 so as to be equal to or less than the bit rate when the effective image area of the current television signal is digitized. ing.

After that, the compressed recording data D6 is converted into the current television format by the format converter 4, and is output to the recording / reproducing device 10 as the compressed recording data D7. Further, after the playback compression data D8 from the recording / playback device 10 is converted into playback compression data D9 having the same format as the recording compression data D6 by the format inverse conversion unit 5, the expansion compression unit 6 and the DA conversion unit 7 output the compressed compression data D8. The decoded video signal S6 is decoded. The format conversion unit 4 has a scanning line number of 525 such as the NTSC system or the PAL system.
The recorded compressed data D6 is inserted into the effective image area of the current television signal, which is a book or 625 lines, and is output as recorded compressed data D7 of the current television format.

FIG. 5 is a block diagram showing an example of the format converter 4. Here, the clock conversion circuit 41
The data clock of the recording compression data D6 is converted to the data clock of the current television signal. For example, if the current television signal is an NTSC color television signal having 525 scanning lines used for broadcasting in Japan, the frequency is four times the color subcarrier frequency of the NTSC signal (about 14.3 MHz). ) Is often used as the data clock, and the data clock of the recording compression data D6 is set to about 1
A process of converting to 4.3 MHz is performed. The recording compression data Dc thus clock-converted is sent to the selection circuit 44.

On the other hand, the current TV synchronization generation circuit 42 generates a horizontal synchronization signal HD, a vertical synchronization signal VD, and a color burst signal BS of the current television signal according to the timing signal C1 generated by the format conversion control circuit 43. To the selection circuit 44. The format conversion control circuit 43 generates the timing signal C1 and also generates the conversion control signal C2 and outputs it to the selection circuit 44. The selection circuit 44 selects input data according to the conversion control signal C2, and outputs the recording compression data D7 of the current television format.

Here, the selection operation performed by the selection circuit 44 will be described. FIG. 7 shows an example of the image format of one frame of the current television signal. An area A1 indicates the effective image area of the first field, and an area A2 indicates the second image area.
The effective image area of the field is shown. In addition, area A
3, A4 and A5 indicate vertical synchronization areas, and areas A6 and A7
Indicates a horizontal synchronization area, and areas A8 and A9 indicate color burst areas. The selection circuit 44 controls the first field effective image area A1 or the second field effective image area A
At time 2, the recording compression data Dc is selected. When any of the vertical synchronization areas A3, A4, and A5 is selected, the vertical synchronization signal VD of the current television signal is selected. Further, when the time is in one of the horizontal synchronization areas A6 and A7, the horizontal synchronization signal HD of the current television signal is selected. Further, at any time of the color burst areas A8 and A9, the color burst signal BS of the current television signal is selected.

The recorded compressed data of the same frame is set in the effective image area of the current television signal of the same frame, and the data amount of one frame of the recorded compressed data is reduced by the effective amount of one frame of the current television signal. When the data amount is less than the data amount of the image area, dummy data is added to the recording compression data, and control is performed so as to match the data amount of the effective image area of the current television signal.

As described above, by inserting the recording compression data D6 into the effective image area of the current television signal, the recording compression data D7 satisfying the data standard of the current television system can be generated. Can use the existing digital recording / reproducing equipment for television as it is.

The format inverse converter 5 shown in FIG. 2 extracts compressed data embedded in the effective image area from the reproduced compressed data D8 of the current television format reproduced by the recording / reproducing device 10 and outputs the original data clock. Is output.

For this reason, as shown in FIG. 6, for example, the format reverse conversion unit 5 includes an effective area extraction circuit 51 for extracting data in an effective image area from the reproduction compression data D8 of the current television format, and a reproduction compression data A format inverse conversion control circuit 52 for temporally determining the effective image area of D8 and outputting the extraction control signal Cs, and a clock inverse conversion circuit 53 for converting the data clock of the extracted compressed data to the original data clock. doing.

The effective area extraction circuit 51 responds to the extraction control signal Cs output by the format inverse conversion control circuit 52 to reproduce the compressed data D of the current television format.
8, compressed data embedded in the effective image area is extracted. Since the data clock of the extracted compressed data has been converted to that of the current television signal, the data clock is converted to the original data clock of the compressed data by the clock reverse conversion circuit 53 and is output as reproduced compressed data D9.

As described above, the recording compression data is inserted into the effective area of the current television format to generate the recording compression data of the current television format.
By extracting valid compressed data from the reproduced compressed data of the current television format and producing the reproduced compressed data, it is possible to use the recording / reproducing equipment for the current television system as it is, and to use the recording / reproducing device for the high-definition video signal. Since it is not necessary to newly prepare a recording / reproducing device, the cost can be significantly reduced. Of course, it may be newly prepared the recording and reproducing equipment, in that case, small of the recording and reproducing equipment
The effect of easily performing molding and long-time recording is obtained.

The format conversion unit 4 and the format inverse conversion unit 5 need not be limited to the configurations shown in FIGS. 5 and 6, and may have any configuration as long as the same format conversion and inverse conversion can be performed. Good.

[0042]

As described above, according to the present invention, the data amount of a digitized high-definition moving image signal is reduced by compression processing, and the bit rate is set to be below the maximum allowable value of the recording / reproducing apparatus. By encoding, the recording / reproducing device does not need to handle high-speed, large-capacity data, and does not require a multi-channel circuit or a high-speed device. Therefore, the recording / reproducing device can be reduced in size and cost. And reliability can be improved. Also, long-time recording and reproduction can be performed.

Further, by converting the data compressed and encoded to the predetermined bit rate into the current television format, it is possible to use the recording / reproducing equipment for the current television system as it is, thereby achieving high definition. It is not necessary to newly prepare a recording / reproducing device for a moving image signal, and the cost can be significantly reduced. Further, it is possible to switch between the recording and reproducing device for the current television and the recording and reproducing device for the high-definition moving image signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of the configuration of the present invention.

FIG. 2 is a block diagram showing one embodiment of the configuration of the first invention of the present invention.

FIG. 3 is a block diagram illustrating an example of a compression encoding unit 2 illustrated in FIGS. 1 and 2;

FIG. 4 is a block diagram illustrating an example of an extension unit 6 illustrated in FIGS. 1 and 2;

FIG. 5 is a block diagram showing an example of a format conversion unit 4 shown in FIG.

FIG. 6 is a block diagram illustrating an example of a format inverse conversion unit 5 illustrated in FIG. 2;

FIG. 7 is a diagram illustrating an example of a format of one frame of a current television signal.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 A / D conversion unit 2 Compression encoding unit 3 Bit rate control unit 4 Format conversion unit 5 Format reverse conversion unit 6 Decompression unit 7 D / A conversion unit 10 Recording / reproducing device 21 Subsampling circuit 22 Scan conversion circuit 23 DCT circuit 25 Quantization circuit 26 Huffman coding circuit 27 Fixed bit length circuit 31 Variable bit length circuit 32 Huffman decoding circuit 33 Inverse quantization circuit 34 Inverse DCT circuit 35 Scan inverse transformation circuit 36 Interpolation processing circuit S1a to S6a Luminance signal S1b to S6b, S1c to S6c Color difference signal D1 Recorded image data D2, D3, D12 Conversion coefficient data D4, D11 Quantized data D5, D10 Huffman code data D6, D7 Recorded compressed data D8, D9 Reconstructed compressed data D13 Reconstructed image data P1, P2 Quantization parameters

Claims (2)

(57) [Claims] A recording / reproducing apparatus for encoding a high-definition moving image signal.
And the playback output of the recording and playback device is restored.
High-definition moving image for decoding and reproducing the high-definition moving image signal
An A / D converter for digitizing the high-definition video signal in the signal encoding / decoding device
And a digital high-definition video signal output by the A / D converter.
Data compression processing using only the data in the frame
And compression coding unit for generating compressed data subjected to physical, this
Bit rate of the compressed data output by the compression encoding unit
Digitizes effective image area of current television signal
The compression code so that the bit rate is
A bit rate control unit for controlling an encoding unit, and the compressed data output from the compression encoding unit.
It is now possible to fit it in the effective image area of the vision system.
Converted to television format data and recorded
A format conversion unit for transmitting to the playback device, and the current television format for playback by the recording and playback device.
Format from the effective image area of the reproduced data
A format inverse conversion unit for extracting data, and a digital high-definition video by decoding the compressed data.
An expansion unit for reproducing an image signal; and the digital high-definition moving image signal output by the expansion unit.
And characterized in that it comprises a D-A converter for analog the
High-definition video signal encoding / decoding device. 2. The compression encoding section according to claim 1 , wherein said high-definition moving image signal comprises a luminance signal and a color difference signal.
The digitalization by the A / D converter.
Sub-sampling is performed on the color difference signal to
Sub-sampling means for reducing the number of pixels in the
The color difference signal and the A / D conversion unit.
Pixel time after receiving each of the tallyed luminance signals
By changing the dynamic order and time-division multiplexing
And scan conversion means for outputting as an image data, to said image data output from the scan conversion means
Performs discrete cosine transform and outputs transform coefficient data
Discrete cosine transform means, and said discrete cosine transform means according to a quantization parameter.
Quantizing means for quantizing the transform coefficient data to be output
And the quantized data output by the quantizing means and the
Using a table created in advance that receives quantization parameters
Converting the quantized data into Huffman code data
Huffman encoding means and the Huffman code data output by the Huffman encoding means.
The data is rearranged to have a fixed bit length and the fixed bit
Fixed bit length output means for outputting compressed data
And the bit rate control unit outputs the transform coefficient data output by the discrete cosine transform unit.
Sum of the code amount per frame after compression based on the
The quantization parameter is set so as not to exceed a predetermined value.
Means for calculating the data , wherein the decompression unit performs
Of the variable length Huffman code data
A variable bit Nagaka means for restoring the data, Huffman code data the variable bit Nagaka means is restored
Huffman code using a preset table for
By performing an inverse transformation of the quantization parameter and the quantum
Huffman decoding means for respectively restoring the quantized data, and the quantization parameter restored by the Huffman decoding means.
Data and an inverse quantization process based on the quantized data.
It said inverse quantization means for restoring the transformation coefficient data with respect to the transform coefficient data the inverse quantization means is restored Te
Inverse discrete cosine transform for each block
And inverse discrete cosine transform means for restoring the image data, the
Image of the image data restored by the inverse discrete cosine transform means.
From the image data restored by changing the temporal order of the elements
The color difference signal and the digital signal subjected to the pixel number reduction processing
Inverse scan means for restoring the luminance signal respectively, and the scan inverse transform means restores and performs a pixel number reduction process.
Interpolation processing is performed on the color difference signal before a predetermined number of pixels.
Interpolation processing means for restoring the color difference signal
2. The high-definition video signal encoding according to claim 1, wherein
Decryption device.