Method and device for compressing film thumbnails

Abstract

The embodiment of the invention discloses a method for compressing film thumbnails, comprising the following steps: carrying out loss compression on the film thumbnails to acquire film thumbnails with specific digits; carrying out run coding on the film thumbnails with the specific digits; and carrying out lossless compression on the film thumbnails which are subjected to the run coding to acquire compressed pictures. The embodiment of the invention also provides a device for compressing film thumbnails. In the invention, the loss compression, the run coding and the lossless compression are combined effectively to compress the film thumbnails, thus having the advantages of higher compression ratio, high compression efficiency, low degree of distortion and fast decoding speed.

Description

technical field [0001] The invention relates to the technical field of video thumbnail processing, in particular to a method and device for compressing video thumbnails. Background technique [0002] Lossy compression utilizes the insensitivity of human beings to certain frequency components in images or sound waves, allowing certain information to be lost during the compression process. Although the original data cannot be completely restored, the lost part has a greater impact on understanding the original image. Small and high compression ratio. Lossy compression is widely used in the compression of speech, image and video data. Generally, the compression of movie thumbnails usually adopts lossy compression based on floating-point operations. [0003] Run-length coding, also known as "run-length coding" or "run-length coding", its basic principle is: use a symbol value or string length to replace consecutive symbols with the same value (continuous symbols constitute a c...

AI Technical Summary

Problems solved by technology

[0006] 1. The algorithm based on floating-point arithmetic performs lossy compression on movie thumbnails, and its compression rate is relatively high. However, due to the complexity of the algorithm of floating-point arithmetic, the compression rate of this scheme is low, easy to be distorted, and the decoding speed is slow. Fully restore the original image;

[0007] 2. The compression rate of run-length coding is low, especially when the color of the video thumbnail is relatively rich, the compression effect of this scheme is not high, and the practicability is low;

[0008] 3. The lossless compression scheme based on LZ77 or LZ78 encoding compression has fast compression speed and is not easy to be distorted, but the compression rate of this scheme is low and the compression effect is not high

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