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Inverse discrete cosine transformation (IDCT) method and apparatus

An inverse transform device and discrete cosine technology, applied in digital video signal modification, electrical components, image communication, etc., can solve problems such as being acceptable without being noticed by human eyes, and achieve improved processing speed, improved performance, and improved processing speed Effect

Inactive Publication Date: 2014-07-02
LEADCORE TECH
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Problems solved by technology

Although there will be some distortion in doing so (that is to say, this compression method is lossy), but in most cases, the compressed image is not required to be exactly the same as the original image, and a small amount of distortion is allowed, as long as these Distortion is acceptable without being noticed by the human eye

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  • Inverse discrete cosine transformation (IDCT) method and apparatus
  • Inverse discrete cosine transformation (IDCT) method and apparatus
  • Inverse discrete cosine transformation (IDCT) method and apparatus

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0043] The first embodiment of the present invention relates to an inverse discrete cosine transform method, which calculates the number of non-zero coefficients in the matrix before the inverse discrete cosine transform IDCT, and performs variable coefficients according to the number of non-zero coefficients IDCT processing...

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Abstract

The invention relates to the field of development of a video multimedia technology, and discloses an inverse discrete cosine transformation (IDCT) method and apparatus. In the method, through counting the number of nonzero coefficients before IDCT, according to the number of the nonzero coefficients, IDCT processing can be carried out on variable coefficients, and different IDCT processes rather than full-coefficient IDCT processing are employed for discrete cosine transformation (DCT) nonzero coefficients of different blocks, so that the IDCT processing speed can be improved, and the performance of a multimedia decoder is enhanced.

Description

technical field [0001] The invention relates to the field of video multimedia technology development, in particular to a discrete cosine inverse transform method and device in video and image codecs. Background technique [0002] Two-dimensional discrete cosine transform (hereinafter referred to as DCT) and discrete cosine inverse transform (hereinafter referred to as IDCT) play a key role in many image and video data compression applications. , H.263, H.264, Motion Picture Experts Group MPEG series protocol) is an important part of the codec algorithm. DCT converts the time sequence of an orthogonal matrix into a frequency signal, and is an orthogonal transform similar to Fourier transform. This transformation has the characteristic that the power (sum of squares) of the input sequence is equal to the power of the transformed sequence. That is to say, if power is concentrated due to conversion in a certain place, the power in other parts will become smaller. The image si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/625
Inventor 付宝玲
Owner LEADCORE TECH
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