Continuous image compression method

A compression method and image technology, applied in the direction of image communication, television, electrical components, etc., can solve the problems of low algorithm complexity, no delay, high performance requirements, etc., and achieve low algorithm complexity, low performance requirements, and no delay The effect of the characteristic

Inactive Publication Date: 2009-05-20
CHUNGHWA TELECOM CO LTD
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Problems solved by technology

[0002] Most of the video streams currently used in image-based digital surveillance use dynamic JPEG (motion JPEG), and a small part use MPEG algorithm for video encoding and compression; dynamic JPEG encoding has no delay characteristics, and the algorithm complexity is low. The performance requirements are relatively low, but only each picture is encoded independently during encoding. If several consecutive pictures have the same content, the same data will be repeatedly produced or transmitted; and MPEG encoding, in addition to encoding a single picture, It will also compare the difference with the content of the adjacent picture. If there is the same or similar part with the content of the adjacent picture, a motion vector (motionvector) and a small amount of data representing the difference will be generated to save the amount of data; however, the MPEG algorithm is more complicated. Encoding requires high performance requirements, and MPEG encoding is based on a group of pictures (GOP, group of pictures), which will be delayed by the number of pictures in each group of pictures. For various image monitoring applications Inconvenient and less than optimal monitoring
[0003] This shows that the method of above-mentioned prior art still has bigger defect, needs to improve urgently

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[0015] The operation flow of the encoding end of the continuous image compression method provided by the present invention, as shown in FIG. 1 , the original picture 10 is first cut into non-overlapping 8×8 pixel blocks 11, and the encoding end uses discrete cosine transform for each block. (DCT, DiscreteCosine Transform) obtains 64 parameter values ​​12, and then compares these 64 parameter values ​​with the DCT parameter value 13 of the same position block in the previous picture. If the similarity of the two sets of DCT parameter values ​​is different If it is lower than the critical value of 14, it is considered that the two pictures before and after the 8×8 block are the same or similar, that is, the condition of motion is not established, and only the DC coefficient value is retained at this time. (the gray part in the upper left corner), the other 63 AC coefficient values ​​(ACcoefficient) are set to 0 (white part); if the similarity of these two sets of DCT parameter va...

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Abstract

This invention relates to a continuous image method, which utilizes DCT parameter values generate in JPEG encoding to carry out mobile detection judgment to decide if the high frequency part in the DCT parameter value is output in terms of the result of the mobile detection judgment to save data volume generated in coding.

Description

technical field [0001] The present invention relates to a continuous image compression method. Background technique [0002] At present, most of the video streams used in video digital surveillance use motion JPEG (motion JPEG), and a small part use MPEG algorithm for video encoding and compression; Motion JPEG encoding has no delay characteristics, and the algorithm complexity is low. The performance requirement is low, but the encoding is only for each picture independently. If the content of several consecutive pictures is the same, the same data will be repeatedly produced or transmitted; and MPEG encoding, in addition to encoding a single picture, It will also compare the difference with the content of the adjacent pictures. If there are the same or similar parts with the content of the adjacent pictures, a motion vector and a small amount of data representing the difference will be generated to save the amount of data; however, the MPEG algorithm is more complicated, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N19/124H04N19/13H04N19/184H04N19/625H04N19/91
Inventor 吴坤荣陈俊文陈育斌郑惟元
Owner CHUNGHWA TELECOM CO LTD
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