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Discrete cosine inverse transformation method and its device

A discrete cosine and inverse transform technology, applied in the field of communication, can solve the problem of consuming system processing resources and so on

Inactive Publication Date: 2007-10-03
HUAWEI TECH CO LTD
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Problems solved by technology

[0010] To sum up, although the AAN algorithm belongs to the IDCT fast algorithm technology, when performing IDCT transformation processing on a one-dimensional 8-point image signal based on the AAN algorithm, it still needs to perform 5 cosine function value floating-point multiplication operations, because the two-dimensional 8×8 When performing DCT and IDCT transform codec processing on the point image signal, the two-dimensional image signal is usually decomposed into row-one-dimensional and column-one-dimensional situations to be processed separately. In this way, an 8×8-point two-dimensional image 80 floating-point multiplication operations are required when the signal is processed by DCT and IDCT. Because the floating-point multiplication operation process consumes a lot of system processing resources, the resources consumed include the consumption of computing time and the consumption of system hardware and software resources. etc. Therefore, it is necessary to further optimize the IDCT transformation process based on the AAN algorithm to speed up the transformation processing speed of IDCT and better meet the needs of modern real-time communication services

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no. 1 example

[0112] First embodiment: as shown in Figure 4, after applying the principle of the method of the present invention, the AAN-based IDCT transformation process update flowchart in the above-mentioned prior art Figure 2, it is assumed here that in the AAN-based IDCT transformation process, use The 32-bit shift register and accumulator perform shift-accumulation operation processing.

[0113] (1) wherein in Fig. 4, the leftmost represents the product of 8 image signal values ​​of the input and the corresponding coefficient scaling factors, and the rightmost end is 8 image signal output values ​​of completing the IDCT transformation of the output, applying the method principle of the present invention to two-dimensional When an 8×8 image signal is processed by AAN IDCT, it is first necessary to preprocess the 64 transformation matrix coefficients of the two-dimensional 8×8 image signal. The principle process of the preprocessing is as follows:

[0114] 1. Preset two amplification p...

no. 2 example

[0156] The second embodiment: as shown in Figure 5, after applying the principle of the method of the present invention, the AAN-based IDCT transformation process update flow chart in the above-mentioned prior art Figure 1, wherein in this second embodiment, no matter in the AAN-based In the process of IDCT transform processing, use 32-bit shift register and accumulator for shift-accumulation operation processing, or use 24-bit shift register and accumulator for shift-accumulation operation processing, which is used for 8×8-point image signal The process of performing IDCT transformation processing is similar to the implementation process described in the above-mentioned first embodiment. For the specific implementation process, please refer to the relevant description in the above-mentioned first embodiment.

[0157] Corresponding to the principle of the method proposed above in the present invention, the present invention also proposes a discrete cosine inverse transform devi...

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Abstract

This invention discloses a scattered cosine inverse transformation method including: carrying out amplifying, correcting and rounding process to the transformed coefficients input initially in the process of scattered cosine inverse transformation to digital signals based on AAN algorithm to substitute corresponded floating-point multiplication operation appearing in the transforming process based on a fixed-point shift accumulation operation and carrying out corresponding reduction process to the final inverse transformation results. This invention also discloses a device.

Description

technical field [0001] The present invention relates to discrete cosine transform (DCT, Discrete Cosine Transform) technology and discrete cosine transform (IDCT, Inverse Discrete Cosine Transform) technology in the field of communication technology, in particular to an inverse discrete cosine transform method and device thereof. Background technique [0002] Since Ahmed and Rao proposed the definition of discrete cosine transform (DCT, Discrete CosineTransform) in 1974, discrete cosine transform and inverse discrete cosine transform (IDCT, Inverse DiscreteCosine Transform) have become widely used in signal processing and image processing in the field of communication. , especially for voice compression and image compression codec processing, so DCT technology and IDCT technology has always been a research hotspot in the international academic circles and high-tech industries. [0003] Due to the requirement of real-time communication characteristics, in the Still Picture Ex...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/24G06F17/14H04N19/48H04N19/625
Inventor 刘建国汪国有戴声奎叶登攀祝平平孟新建郑建铧
Owner HUAWEI TECH CO LTD
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