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Method for implementing near-lossless image compression encoder hardware based on joint photographic experts group lossless and near-lossless compression of continuous-tone still image (JPEG-LS)

A JPEG-LS, 1. JPEG-LS technology, applied in the image compression coding technology, near lossless image compression encoder hardware implementation field, can solve the decoding difficulty, image compression performance degradation and other problems, to avoid multiplication and division operations, improve Processing speed, effect of reducing system power consumption

Inactive Publication Date: 2013-03-13
XIDIAN UNIV
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Problems solved by technology

However, the disadvantage of this method is that this method changes the content of the JPEG-LS image compression standard for the convenience of hardware implementation, which reduces the performance of image compression and brings difficulty to decoding.

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  • Method for implementing near-lossless image compression encoder hardware based on joint photographic experts group lossless and near-lossless compression of continuous-tone still image (JPEG-LS)
  • Method for implementing near-lossless image compression encoder hardware based on joint photographic experts group lossless and near-lossless compression of continuous-tone still image (JPEG-LS)
  • Method for implementing near-lossless image compression encoder hardware based on joint photographic experts group lossless and near-lossless compression of continuous-tone still image (JPEG-LS)

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[0044] Attached below figure 1 The implementation steps of the present invention are described in detail.

[0045] Step 1. Obtain the predicted reconstruction value.

[0046] In the first step, the encoder receives the pixel from the camera, and judges whether the current pixel is the first pixel of the row of images, and if so, assigns the predicted reconstruction value of the previous pixel of the current pixel to 0, and performs step 2, otherwise Execute the second step.

[0047] In the second step, since the encoder needs to use the reconstruction value of the previous pixel to process the current pixel, and the reconstruction value of the previous pixel has not been calculated at this time, the encoder uses the predicted reconstruction value of the previous pixel instead of the reconstruction value. deal with. According to the nature of the limited distortion degree of the JPEG-LS standard, that is, the difference between the reconstruction value of the pixel and the o...

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Abstract

The invention discloses a method for implementing near-lossless image compression encoder hardware based on JPEG-LS and overcomes defects of slow processing speeds and poor compression performances of encoders in the prior art. The method comprises obtaining prediction reconstruction values; predicting pixels; obtaining context index values; obtaining pixel residual errors; calculating reconstruction values; updating parameters; mapping errors and encoding Golomb. Compared with the prior art, the method has the advantages of being rapid in processing speed, good in compression performance and low in hardware implementation complexity.

Description

technical field [0001] The present invention relates to the technical field of image processing, and further relates to a JPEG_LS (Joint Photographic Experts Group Lossless and near_lossless compression of conituous_tone still image) continuous-tone still image near lossless image compression encoder hardware implementation method in the image compression field. The invention is suitable for the image compression coding technology in remote sensing satellite application. Background technique [0002] The JPEG-LS image compression standard is a lossless and near-lossless compression standard for still images. It is widely used in the field of remote sensing image compression due to its low complexity and excellent performance under lossless / near-lossless compression. However, in the near lossless compression mode, there are the following difficulties in hardware implementation: first, each pixel needs to use the reconstruction value of the previous pixel in the first clock cy...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N19/42
Inventor 雷杰张毅李云松贾超群张皓
Owner XIDIAN UNIV
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