Image information encoding device and method and image information decoding device and method
Image information encoding device and method and image information decoding device and method
 CN 101,646,085 B
 Filed: 07/20/2004
 Issued: 08/10/2016
 Est. Priority Date: 07/18/2003
 Status: Active Grant
First Claim
1. the code device that picture signal is encoded, it is characterised in that possess:
 Predicting unit in image, the chroma format signal of the resolution notationally stating the colour difference signal of picture signal is 4;
2;
2In the case of form, color space signal designation YCbCr, in 8 ×
16 pixels of the block to be arranged 8 ×
8 pixels at longitudinal directionWhen block unit carries out image intraprediction encoding by DC prediction mode to abovementioned colour difference signal, it is divided into 8 ×
8 block of pixels to use topWith the meansigma methods that the pixel of left side adjacent block calculates them, thus generate prognostic chart picture；
Converter unit, only gather with 4 ×
4 block of pixels units to by abovementioned image predicting unit generate prognostic chart picture and artworkThe DC coefficient of the differential signal of picture carry out integer precision discrete cosine transform and obtain 4 ×
4 pieces and constitute the colourity of 2 ×
4 piecesDC block, carries out Discrete Hadamard transfer with 2 ×
4 block units to the colourity DC block constituted；
Quantifying unit, the conversion carried out according to abovementioned converter unit adaptively changes quantization method, to abovementioned converter unit instituteThe conversion coefficient produced quantifies；
AndCoding unit, the abovementioned conversion coefficient that abovementioned quantifying unit is quantified, abovementioned chroma format signal and abovementioned colored skyBetween signal encode.
Chinese PRB Reexamination
Abstract
The present invention relates to image information encoding device and method and image information decoding device and method.A kind of chromatic component resolution based on received image signal and color space is provided to carry out the image information encoding device of image intraprediction encoding.In this image information encoding device (10), one intraprediction unit (23) resolution based on its indication color component of chroma format signal is 4:2:0 form, which and its indication color space of color space signal in 4:2:2 form and 4:4:4 form etc. are YCbCr, which in RGB and XYZ etc. adaptively changes block size, produces a prognostic chart picture.Additionally, orthogonal transform unit (14) and quantifying unit (15) are also according to chroma format signal and color space signal change orthogonal transformation method and quantization method.Colourity format signal and color space signal are encoded by reversible encoding unit (16), are included in compressed image information by the coded signal obtained.
4 Claims

1. the code device that picture signal is encoded, it is characterised in that possess:

Predicting unit in image, the chroma format signal of the resolution notationally stating the colour difference signal of picture signal is 4;
2;
2In the case of form, color space signal designation YCbCr, in 8 ×
16 pixels of the block to be arranged 8 ×
8 pixels at longitudinal directionWhen block unit carries out image intraprediction encoding by DC prediction mode to abovementioned colour difference signal, it is divided into 8 ×
8 block of pixels to use topWith the meansigma methods that the pixel of left side adjacent block calculates them, thus generate prognostic chart picture；Converter unit, only gather with 4 ×
4 block of pixels units to by abovementioned image predicting unit generate prognostic chart picture and artworkThe DC coefficient of the differential signal of picture carry out integer precision discrete cosine transform and obtain 4 ×
4 pieces and constitute the colourity of 2 ×
4 piecesDC block, carries out Discrete Hadamard transfer with 2 ×
4 block units to the colourity DC block constituted；Quantifying unit, the conversion carried out according to abovementioned converter unit adaptively changes quantization method, to abovementioned converter unit instituteThe conversion coefficient produced quantifies；
AndCoding unit, the abovementioned conversion coefficient that abovementioned quantifying unit is quantified, abovementioned chroma format signal and abovementioned colored skyBetween signal encode.


2. the coded method that picture signal is encoded, it is characterised in that have:

Prediction steps in image, the chroma format signal of the resolution notationally stating the colour difference signal of picture signal is 4;
2;
2In the case of form, color space signal designation YCbCr, at 8 ×
16 pictures of the block to be arranged 8 ×
8 pixels on longitudinal directionWhen element block unit carries out image intraprediction encoding by DC prediction mode to abovementioned colour difference signal, it is divided into 8 ×
8 block of pixels to useThe pixel of limit and left side adjacent block calculates their meansigma methods, thus generates prognostic chart picture；Shift step, only gather with 4 ×
4 block of pixels units in prediction steps in abovementioned image generate prognostic chart picture with formerThe DC coefficient of the differential signal of image carry out integer precision discrete cosine transform and obtain 4 ×
4 pieces constitutes the color of 2 ×
4 piecesDegree DC block, carries out Discrete Hadamard transfer with 2 ×
4 block units to the colourity DC block constituted；Quantization step, the conversion carried out according to abovementioned shift step adaptively changes quantization method, to abovementioned shift step instituteThe conversion coefficient produced quantifies；
AndCoding step, the abovementioned conversion coefficient that abovementioned quantization step is quantified, abovementioned chroma format signal and abovementioned colored skyBetween signal encode.


3. a decoding apparatus, it is characterised in that possess:

Decoding unit, to the conversion coefficient, the chroma format signal of indication color signal resolution and the instruction that quantify and after codingThe color space signal of color space is decoded； Inverse quantization unit, changes inverse quantization method according to chroma format signal and color space signal adaptation, for 2 ×
4The block unit DC coefficient to only gathering 4 ×
4 pieces obtained so that 4 ×
4 block of pixels units carry out integer precision discrete cosine transformAnd the conversion coefficient that the colourity DC block of constitute 2 ×
4 pieces carries out Discrete Hadamard transfer and obtains carries out requantization；Inverse transformation block, the chroma format signal in the resolution of the colour difference signal representing picture signal is 4;
2;
2 forms, colourIn the case of spacing wave instruction YCbCr, the conversion coefficient after abovementioned requantization is carried out inverse discrete with 2 ×
4 block unitsHadamard converts, using coefficient after inverse Discrete Hadamard transfer as with the block being arranged 8 ×
8 pixels on longitudinal directionEach DC coefficient of 8 ×
16 block of pixels corresponding 84 ×
4 pieces and carry out integer precision inverse discrete cosine transform；
AndPredicting unit in image, uses the coefficient after being converted by abovementioned inverse transformation block, to be arranged 8 ×
8 pictures on longitudinal directionWhen 8 ×
16 block of pixels units of the block of element carry out prediction decoding in image to abovementioned colour difference signal by DC prediction mode, it is divided into 8×
8 block of pixels use the pixel of top and left side adjacent block to calculate their meansigma methods, thus generate prognostic chart picture.


4. a coding/decoding method, it is characterised in that have:

Decoding step, to the conversion coefficient, the chroma format signal of indication color signal resolution and the instruction that quantify and after codingThe color space signal of color space is decoded； Inverse quantization step, changes inverse quantization method according to chroma format signal and color space signal adaptation, for 2 ×
4The block unit DC coefficient to only gathering 4 ×
4 pieces obtained so that 4 ×
4 block of pixels units carry out integer precision discrete cosine transformAnd the conversion coefficient that the colourity DC block of constitute 2 ×
4 pieces carries out Discrete Hadamard transfer and obtains carries out requantization；Inverse transformation step, the chroma format signal in the resolution of the colour difference signal representing picture signal is 4;
2;
2 forms, colourIn the case of spacing wave instruction YCbCr, the conversion coefficient after abovementioned requantization is carried out inverse discrete with 2 ×
4 block unitsHadamard converts, using coefficient after inverse Discrete Hadamard transfer as with the block being arranged 8 ×
8 pixels on longitudinal directionEach DC coefficient of 8 ×
16 block of pixels corresponding 84 ×
4 pieces and carry out integer precision inverse discrete cosine transform；
AndPrediction steps in image, uses the coefficient after being converted by abovementioned inverse transformation step, to be arranged 8 ×
8 on longitudinal directionWhen 8 ×
16 block of pixels units of the block of pixel carry out prediction decoding in image to abovementioned colour difference signal by DC prediction mode, pointIt is that 8 ×
8 block of pixels use the pixel of top and left side adjacent block to calculate their meansigma methods, thus generates prognostic chart picture.

Specification(s)