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Minitype two-dimensional discrete cosine transform device

A two-dimensional discrete cosine and transformation device technology, which is applied in digital video signal modification, electrical components, image communication, etc., can solve problems such as high computational complexity, decreased correlation of video images, unfavorable rapid realization of two-dimensional discrete cosine transformation, etc.

Inactive Publication Date: 2014-03-05
JIANGSU XINRUIFENG INFORMATION TECH
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Problems solved by technology

[0004] (2) The correlation of the video image is obviously reduced, and the energy of the signal is mainly concentrated on a few transform coefficients, and the data can be effectively compressed by quantization and entropy coding
M and N are constants, according to image 3 Calculation method, one-dimensional DCT needs 4 multiplications, and the calculation complexity is high, which is not conducive to the rapid realization of two-dimensional discrete cosine transform

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  • Minitype two-dimensional discrete cosine transform device
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  • Minitype two-dimensional discrete cosine transform device

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Embodiment Construction

[0021] A miniature two-dimensional discrete cosine transform device disclosed by the present invention is divided into three parts: a first one-dimensional DCT module, a transposition buffer, and a second one-dimensional DCT module. The transposition buffer stores the results of the first one-dimensional DCT module in rows, and outputs the cached data to the second one-dimensional DCT module in columns. The hardware structure design of a miniature two-dimensional discrete cosine transform device is as follows: Figure 4 (a) shown.

[0022] The difference between the above two 1D DCT modules is the number of bits of data processed. The number of data bits processed by the second one-dimensional DCT module is higher than that of the first one-dimensional DCT module. The one-dimensional DCT module has a total of 9 additions and subtractions and 1 multiplication. Compared with addition and subtraction operations, multiplication is more complicated and more time-consuming to cal...

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Abstract

The invention discloses a minitype two-dimensional discrete cosine transform device. According to the minitype two-dimensional discrete cosine transform device, one-dimensional DCT is carried out twice, transposition operation is carried out once, a novel two-dimensional DCT intermediate transposition structure is adopted, and the cache area is small. Compared with a traditional realizing method, the minitype two-dimensional discrete cosine transform device has the advantages that time delay is shortened by 7.5%, and the area is reduced by 51%.

Description

technical field [0001] The invention belongs to the field of computer applications, in particular to the field of image processing. Background technique [0002] Discrete cosine transform (DCT) is an orthogonal transform method proposed by N.Ahmed et al. in 1974. It is often considered the best method for transforming speech and image signals. For the needs of engineering realization, many scholars at home and abroad have spent a lot of energy to find or improve the fast algorithm of discrete cosine transform. Due to the development of digital signal processing chips (DSP) in recent years, coupled with the advantages of ASIC design, this has firmly established the important position of discrete cosine transform (DCT) in the current image coding, becoming H.261, JPEG , MPEG, H.264 and other international common encoding standards. In video compression, the most commonly used transformation method is DCT. It is considered to be a quasi-optimal transform whose performance i...

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Application Information

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IPC IPC(8): H04N19/625H04N19/433
Inventor 刘迎春魏华峰吴敏
Owner JIANGSU XINRUIFENG INFORMATION TECH
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