Device and method of image information coding, and also device and method of image information decoding

FIELD: information technologies.

SUBSTANCE: invention concerns systems of coding/decoding of the squeezed image with the use of orthogonal transformation and forecasting/neutralisation of a motion on the basis of resolving ability of builders of colour and colour space of an input picture signal. The device (10) codings of the information of the image the forecastings (23) block with interior coding is offered is intended for an adaptive dimensional change of the block at generating of the predicted image, on the basis of the signal of a format of chromaticity specifying, whether is resolving ability of builders of colour one of the format 4:2:0, a format 4:2:2 and a format 4:4:4, and a signal of the colour space specifying, whether the colour space one of YCbCr, RGB and XYZ is. The block (14) orthogonal transformations and the quantization block (15) are intended for change of a procedure of orthogonal transformation and quantization procedure according to a signal of a format of chromaticity and a signal of colour space. The block (16) of return coding codes a signal of a format of chromaticity and a signal of colour space for insert of the coded signals gained, thus, in the squeezed information of the image.

EFFECT: increase of image coding and decoding efficiency.

125 cl, 12 dwg, 1 tbl

 

The text descriptions are given in facsimile form.

1. Device for encoding information of the image intended for the separation of the blocks of the input image signal to run against him orthogonal transformation on the basis of the unit to perform the quantization, the device coding of image information contains

forecasting encoded within the image intended for the adaptive chunk size based on the signal format color indicating the resolution of the color signal, and the signal of the color space that specifies the color space to generate the projected image when performing the encoding of the color signal with the prediction within the image;

the conversion tool designed to do, based on the predetermined block size, integral transform of the difference signal between the predicted image generated by means of predictive coding within the image and the source image;

the quantization means, intended for the adaptive modification of the method of quantization in accordance with the conversion processing performed by the tool transformation is, for quantization of the transform coefficients generated by the conversion tool; and

a means of encoding used to encode the transform coefficients, qualified by means of quantization, signal format color and signal color space.

2. Device for encoding information image according to claim 1, in which the conversion tool additionally performs integral transformation blocks, the resulting collection only DC components after carrying out the integral transforms based on the specified block size.

3. Device for encoding information image according to claim 2, in which the signal of the color format includes at least the format 4:2:0, 4:2:2 and 4:4:4, and the signal color space includes at least YCbCr, RGB and XYZ.

4. Device for encoding information image according to claim 3, in which when the signal of the color format is a format of 4:2:0, and the signal color space is a YCbCr, forecasting encoded within the image generates a predicted image on the basis of 8×8 pixels.

5. Device for encoding information image according to claim 3, in which when the signal of the color format is a format of 4:2:2, and the signal color space PR is dstanley the YCbCr signal, forecasting encoded within the image generates a predicted image on the basis of 8×16 pixel blocks of size 8×8 pixels are arranged in the longitudinal direction.

6. Device for encoding information image according to claim 3, in which when the signal of the color format is a format of 4:4:4, and the signal color space is a YCbCr, RGB or XYZ, forecasting encoded within the image generates a predicted image on the basis of 16×16 pixel blocks of size 8×8 pixels are arranged in longitudinal and transverse directions.

7. Device for encoding information image according to claim 4, in which when the signal of the color format is a format of 4:2:0, and the signal color space is a YCbCr conversion tool performs the integral transformation of the differential signal based on 4×4 pixels for the further implementation of the integral transform block size of 2×2 modules pixels, compiled by collecting the converted DC components.

8. Device for encoding information image according to claim 7, in which, when the corresponding coefficients of blocks of size 2×2 modules pixels expressed as fdc2×2, the corresponding coefficients fdc'2×2 p is after the integral transforms of the respective blocks can be represented by the following formula:

where

9. Device for encoding information image according to claim 5, in which when the signal format chrominance format is 4:2:2, and the signal of the color space is YCbCr conversion tool performs the integral transformation of the differential signal based on 4×4 pixels, for further implementation of integral transforms blocks of size 2×4 modules of pixels that are compiled by collecting the converted DC components.

10. Device for encoding information image according to claim 9, in which, when the corresponding coefficients of blocks of size 2×4 modules pixels expressed as fdc2×4, the corresponding coefficients fdc'2×4 after carrying out the integral transforms of the respective blocks can be represented by the following formula:

where

11. Device for encoding the image information of claim 10, in which the relationship between fdc2×4 and fdc'2×4 can be approximated by the following formula:

12. Device for encoding information image according to claim 6, in which when the signal format color you submitted the format 4:4:4, and the signal of the color space is YCbCr, RGB or XYZ conversion tool performs the integral transformation of the differential signal based on 4×4 pixels, for the further implementation of integral transforms blocks of size 4×4 modules pixels, compiled by collecting the converted DC components.

13. Device for encoding the image information indicated in paragraph 12, where the corresponding coefficients of blocks of size 4×4 modules pixels expressed as fdc4×4, the corresponding coefficients fdc'4×4 after carrying out the integral transforms of the respective blocks can be represented by the following formula.

where

14. A method of coding information of the image, consisting in the separation of the blocks of the input image signal and perform its orthogonal transformation on the basis of the unit intended for quantization and encoding of image information includes

step prediction encoded within the image, consisting in the adaptive change of block size on the basis of the signal format color indicating the resolution of the color signal, and the signal of the color space that specifies the color space to generate prognoziruemaja image when performing predictive coding signal color within the image;

the transformation phase, consisting in the performance, based on the predetermined block size, processing integral transform of the difference signal between the predicted image generated at step prediction encoded within the image and the source image;

phase quantization, consisting in adaptive change methods of quantization, in accordance with the conversion processing performed on the stage of conversion, quantization of transform coefficients generated by the conversion step; and

the coding stage, consisting in the coding of transform coefficients, qualified at the stage of quantization, signal format color and signal color space.

15. A method of coding information of the image 14, in which the conversion step is additionally performed by the integral transform blocks, composed by collecting only the DC components after carrying out the integral transforms based on the specified block size.

16. A method of coding information of the image 14 in which the signal of the color format includes at least the format 4:2:0, 4:2:2 and 4:4:4, and the signal color space includes at least YCbCr, RGB and XYZ.

17. The decoding device information of the image used on the I decoding information, obtained by performing inverse quantization and inverse orthogonal transformation in terms of the compressed image information in which the input image signal is divided into blocks to run against him orthogonal transformation on the basis of the unit so that it performs quantization and decoding device information of the image contains

the a decoder designed to decode qualified and coded transform coefficients, signal format color indicating the resolution of the color signal, and the signal of the color space that specifies the color space;

the means of the inverse quantization intended for adaptive changes in the methods of inverse quantization, in accordance with the signal format chrominance signal of a color space, for inverse quantization of the transform coefficients decoded by using the decoding;

means of inverse transformation, designed to perform integral transforms back qualified units; and

forecasting encoded within the image that is intended to generate a projected image when performing decoding signal color is predictive inside the image block size, corresponding to the signal format color and the color signal space, using the output means of the inverse transform.

18. The decoding device information of the image 17 in which the tool performs inverse transformation of the integral transform back qualified units to perform further integral transforms of the corresponding coefficients based on the predetermined block size, as of the respective DC components of the blocks with the specified block size.

19. The decoding device information of the image p, in which the signal of the color format includes at least the format 4:2:0, 4:2:2 and 4:4:4, and the signal color space includes at least YCbCr, RGB and XYZ.

20. The device decoding of image information according to claim 19, in which when the signal format chrominance format is 4:2:0, and the signal of the color space is YCbCr, the tool performs inverse transformation of the integral transform back qualified blocks of size 2×2 modules pixels for the further implementation of integral transforms converted the relevant factors, as appropriate DC coefficients of the four blocks of size 4×4 modules of pixels that make up BC is to size 8× 8 pixels.

21. The device decoding of image information according to claim 19, in which when the signal format chrominance format is 4:2:2, and the signal of the color space is YCbCr, the tool performs inverse transformation of the integral transform back qualified blocks of size 2×4 modules pixels, for the further implementation of integral transforms converted the relevant index as of the respective DC coefficients of the eight blocks of size 4×4 modules of pixels that make up the blocks of size 8×16 pixels.

22. The device decoding of image information according to claim 19, in which when the signal format chrominance format is 4:4:4, and the signal of the color space is YCbCr, RGB or XYZ conversion tool performs integral transformation back qualified blocks of size 4×4 modules pixels, for the further implementation of integral transforms converted the relevant index as of the respective DC coefficients 16 blocks of size 4×4 modules of pixels that make up the blocks of size 16×16 pixels.

23. The method of decoding of image information, comprising decoding information obtained by performing inverse quantization and brachnogo orthogonal transformation in terms of the compressed picture information, in which the input image signal is divided into blocks to run against him orthogonal transformation on the basis of the unit so that it performs quantization, the method of decoding of image information, including

stage decoding, comprising decoding qualified and coded transform coefficients, signal format color indicating the resolution of the color signal, and the signal of the color space that specifies the color space;

phase inverse quantization, consisting in adaptive changes in the methods of inverse quantization, in accordance with the signal format chrominance signal of a color space, for inverse quantization of the transform coefficients decoded during decoding;

the runtime inverse transformation consisting in the implementation of integral transforms back qualified units for further processing based on the predetermined block size, integral transforms of the corresponding coefficients as the corresponding components DC with the specified block size; and

step prediction encoded within the image, consisting in generating a predicted image when performing decoding of the color signal with prognozi what Finance within the image block size, corresponding to the signal format color and the color signal space, using the output signal of the reverse phase transformation.

24. The method of decoding of image information in item 23, which, during the inverse transform is performed by the integral transform back qualified units to perform further integral transforms of the corresponding coefficients, based on the predetermined block size, as of the respective DC components of the blocks with the specified block size.

25. The method of decoding information of the image point 24, in which the signal of the color format includes at least the format 4:2:0, 4:2:2 and 4:4:4, and the signal color space includes at least YCbCr, RGB and XYZ.



 

Same patents:

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23 dwg

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