OmapL138-chip-based Jpeg compression algorithm

A compression algorithm and chip technology, applied in the fields of digital video signal modification, electrical components, image communication, etc., can solve the problems of the Jpeg algorithm due to the large amount of data, slow processing speed, unable to meet the actual needs of society, etc., and achieve memory and peripheral resources. Rich, improve the realization efficiency, cost-effective effect

Active Publication Date: 2015-10-28
深圳市哈工交通电子有限公司
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Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of Jpeg compression algorithm based on OmapL138 chip, solve the problem that the Jpeg algorithm in the prior art can't meet the actual needs of the current society because of the large amount of data and the slow processing speed

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  • OmapL138-chip-based Jpeg compression algorithm

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Embodiment

[0035] like Figure 2 to Figure 4 As shown, the Jpeg compression algorithm based on the OmapL138 chip disclosed by the present invention includes the following steps:

[0036] (1) Read the image YUV420 data through the ARM core of the OmapL138 chip, and save the data to the DDR2 memory;

[0037] (2) The ARM core reads image data from DDR2 in batches, and linearly arranges the image data in the L2 memory of the DSP core of the OmapL138 chip;

[0038] (3) DSP extracts image data from the L2 memory, performs DCT transformation and quantizes the transformation results, and sends the calculated results back to the L2 memory;

[0039] (4) ARM extracts the processed results from the L2 memory and performs entropy encoding;

[0040] (5) Repeat steps (2) to (4) until all image data processing is completed and Jpeg compression is completed.

[0041] Specifically, when performing step (1), ARM first fills the mark of the Jpeg format specification, and fills in the width and height inf...

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Abstract

Disclosed in the invention is an OmapL138-chip-based Jpeg compression algorithm. The method comprises the following steps: (1), image YUV420 data are read by an ARM kernel of an OmapL138 chip and are stored into a DDR2 internal memory; (2), the image data are read in batches from the DDR2 by the ARM kernel and are arranged in an L2 internal memory of a DSP kernel of the OmapL138 chip linearly; (3), the image data are extracted from the L2 internal memory by the DSP, DCT conversion is carried out and the conversion result is quantized, and a result after calculation is returned to the L2 internal memory; (4), the result being processed is extracted from the L2 internal memory by the ARM and entropy coding is carried out; and (5), the steps from (2) to (4) are repeated until processing of all image data is completed, and Jpeg compression is completed. On the basis of the technical scheme, the performance of the OmapL138 chip can be utilized to the greatest extent; a phenomenon that the Jpeg compression algorithm can not be realized quickly can be substantially improved; and thus the practical value of the Jpeg compression algorithm can be substantially enhanced.

Description

technical field [0001] The invention relates to a Jpeg compression algorithm, in particular to a Jpeg compression algorithm based on an OmapL138 chip. Background technique [0002] The standard image file format in the Windows operating system is BMP. If the number of real-time processing points is relatively large, the amount of processed data is still very large. Such a large amount of data may not be able to meet real-time transmission. Therefore, it is hoped that the image data will be transmitted in A certain amount of compression can be performed before the image quality is not lost, and the amount of data can be reduced, and the data can be transmitted in a more timely manner. [0003] JPEG (Joint Photographic Expert Group, the Joint Photographic Expert Group) was established at the end of 1986 to formulate an international standard for the encoding and decoding process and the compressed image data format for the compression algorithm of continuous-tone still images....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/42H04N19/156
Inventor 曹泉郭强艾通
Owner 深圳市哈工交通电子有限公司
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