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JPEG image compression acceleration method

An image compression and image technology, applied in the field of image processing, can solve the problems of slow calculation speed and high CPU usage, and achieve the effect of improving efficiency, improving work efficiency and releasing CPU performance.

Pending Publication Date: 2022-01-25
上海济物光电技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects in the prior art, the object of the present invention is to provide a JPEG image compression acceleration method to solve the problems of high CPU usage and slow calculation speed when the embedded development board directly utilizes the JPEG algorithm for data compression

Method used

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0029] The JPEG algorithm can not only compress color images, but also compress grayscale images. The compression principles are the same. In the embodiments of the present invention, grayscale images are compressed for illustration. Specifically, figure 1 Shown is a flow chart of the JPEG image compression acceleration method provided by the embodiment of the present invention, as figure 1 As shown, the method includes the following steps:

[0030] S1: Set the quantization table according to the image...

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Abstract

The invention provides a JPEG image compression acceleration method, which comprises the following steps of: setting a quantization table according to image quality, and compiling a JPEG image file header; dividing the image into a plurality of small image blocks, and storing each small image block into a memory; performing two-dimensional DCT on each small image block by adopting an FFT accelerator, and quantizing data subjected to DCT according to the quantization table; and carrying out entropy coding on the quantized data, writing in a file end identifier, storing the data, and completing image compression. According to the JPEG image compression acceleration method, the problems of high CPU occupancy rate and low calculation speed when an existing embedded development board directly utilizes a JPEG algorithm to carry out data compression can be solved.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a JPEG image compression acceleration method. Background technique [0002] In embedded development, the utilization efficiency of CPU has always been concerned by people. If the CPU is directly used for data calculation, it will take up a lot of CPU time, which may cause the inability to respond to CPU interrupts in time, and seriously reduce the use of embedded development boards. Performance, even unable to meet the needs of rapid response. [0003] JPEG file is a very common picture format file, and it is also a picture format file with very advanced compression technology. Compared with picture files in other formats, it can achieve high compression ratio and high image quality. If the DCT (discrete cosine transform) in the JPEG algorithm is directly calculated using the discrete cosine formula, the CPU occupancy rate is high and the time-consuming is relatively la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/122H04N19/124H04N19/13H04N19/423
CPCH04N19/124H04N19/122H04N19/13H04N19/423
Inventor 李博翰
Owner 上海济物光电技术有限公司
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