JPEG_LS (Joint Pho-tographic Experts Group-Lossless Standard) bit rate control method under high bit rate
A code rate control and high code rate technology, applied in the field of JPEG_LS code rate control under high code rate, can solve the problems of poor restored image quality, poor compression performance, large difference in restored image quality, etc., and achieve good code rate control accuracy , the effect of good compression performance
Inactive Publication Date: 2014-09-17
XIDIAN UNIV
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However, the shortcomings of these two methods are that the compression performance depends on the empirical value, and the better the empirical value, the better compression performance can be obtained, and the poorer the empirical value, the poorer the compression performance.
And these two methods also have another shortcoming, the quality of the restored image in each area is quite different, the restored image quality of some areas is better, and the restored image quality of some areas is poor
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[0031] Attached below figure 1 The implementation steps of the present invention are described in detail.
[0032] Step 1. Divide the input original image into N strips, the width of each strip is the same as the width of the original image, the height can take the same value or different values, and N is a positive integer greater than or equal to 1.
[0033] Step 2. For all strips, use JPEG_LS lossless compression method to obtain a lossless compressed code stream and a lossless compressed code rate. The JPEG_LS lossless compression method uses the standard JPEG_LS algorithm to compress the image, and the residual coefficients after prediction are not quantized.
[0034] Step 3. Determine whether the code rate after lossless compression reaches the total target code rate set by the user, and the total target code rate is a fixed value set by the user according to the actual application requirements. When the code rate of lossless compression is less than or equal to the to...
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The invention discloses a JPEG_LS (Joint Pho-tographic Experts Group-Lossless Standard) bit rate control method under the high bit rate, which comprises the following implementing steps of: (1) dividing an original image into a plurality of strips; (2) processing all the strips by adopting a JPEG_LS lossless compression mode to obtain a bit stream subjected to lossless compression and a bit rate subjected to lossless compression; (3) judging whether to reach a total target bit rate; (4) carrying out processing in a bit rate control JPEG_LS lossy compression mode; and (5) outputting a final bit stream formed by combining the compressed bit stream with auxiliary information. According to the JPEG_LS (Joint Pho-tographic Experts Group-Lossless Standard) bit rate control method under high bit rate provided by the invention, the relation between the optimal quantization steps and the relation between target bit rates in the strips are searched by utilizing the rate-distortion characteristic of a residual error in each strip under the high bit rate in a JPEG_LS algorithm; by the utilization of the two relations, the time of searching the optimal quantization steps in a bit rate control algorithm is greatly simplified; and the JPEG_LS bit rate control method under the high bit rate is very suitable for high bit rate compression of a remote sensing image.
Description
technical field [0001] The 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) code rate control method under high code rate. characteristics, find the relationship between the target code rates in different regions of the image and the relationship between the optimal quantization step size, and then use the Lagrange multiplier method to find the optimal quantization step size in this region from the target code rate of a local area, It is quantized as a global quantization step size based on the relationship of the quantization step size. The present invention can be used for image compression coding of various digital devices. Background technique [0002] The JPEG_LS algorithm is a lossless and near-lossless compression standard for still images. It is widely used in remote sensing image compression due to its good performanc...
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IPC IPC(8): H04N19/19H04N19/567H04N19/146
Inventor 张静李云松王柯俨刘凯郭杰雷杰
Owner XIDIAN UNIV