Method and device for integer transform of image residual matrix, and method and device for inverse transform of image residual matrix

Abstract

The invention discloses a method and a device for integer transform of an image residual matrix, and a method and a device for inverse transform of the image residual matrix. The method for the integer transform of the image residual matrix comprises the following steps of: performing the integer transform on the image residual matrix, when the bit of acquired memory space needed by each matrix element in the matrixes during integer transform is judged to be more than the parallel processible bit of a processor, determining a difference value between the bit of the memory space needed by eachmatrix element and the parallel processible bit of the processor, and moving the bit of the memory space needed by each matrix element to the right according to a shift length not less than the difference value. According to the method and the device for the integer transform of the image residual matrix of the invention, the problem of data overflow caused when the image residual matrix of whichthe bit of the memory space needed by each matrix element is more than 9 is subjected to the integer transform in the prior art can be solved.

Description

technical field [0001] The invention relates to the technical field of computer and communication, in particular to a method and a device for performing integer transformation on an image residual matrix, and a method and a device for performing integer inverse transformation on an image residual matrix. Background technique [0002] In the prior art, the formula for integer transformation of the image residual matrix by the adopted 8×8 integer transformation matrix is ​​shown in the following formula (1): [0003] Y=CXC T (1) [0004] Where X is an 8×8 image residual matrix corresponding to the input image information matrix (the image information matrix may include image brightness information matrix and image chrominance information matrix, etc.), if the storage space required by each matrix element in the image information matrix is If the number of bits is n, then the number of bits of storage space required by each element in the image residual matrix ...

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Problems solved by technology

[0026] Embodiments of the present invention provide a method and device for performing integer transformation on an image residual matrix, which is used to solve the problem of performing integer transformation on an image residual matrix whose storage space required by each matrix element is greater than 9 bits in the prior art. data overflow problem

[0027] Embodiments of the present invention provide a method and device for performing integer inverse transformation on an image residual matrix, which is used to solve the problem of performing integer inverse transformation on an image residual matrix whose storage space required by each matrix element is greater than 9 bits in the prior art When processing, the problem of data overflow occurs

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