Integrity verification method, device and medium for a webp picture

Abstract

The application discloses a method, device and medium for verifying the integrity of a WebP picture, and relates to the field of computer technology. The method includes: reading the file bytes of the WebP picture file, dividing the file bytes into multiple byte groups according to the order of the file bytes and a preset integrity judgment template; determining the verification type of each byte group , determine whether to convert the byte group into a positive integer according to the check type; if not, then according to the position of the byte group in the file byte, compare the byte group with the byte at the corresponding position in the integrity judgment template If necessary, convert the byte group into a positive integer, and according to the position of the byte group in the file byte, compare the positive integer with the verification parameters of the WebP image file to determine the byte group integrity. Before decoding the WebP picture file, this application first judges its integrity, and only actually decodes the complete WebP picture file, so as to improve the decoding efficiency.

Description

technical field [0001] The present application relates to the field of computer technology, and in particular to a method, device and medium for verifying the integrity of a WebP image. Background technique [0002] WebP is an image file format that provides both lossy and lossless compression (reversible compression). It uses VP8 encoder for image compression, uses predictive coding technology to predict the color value of its adjacent blocks through the color of some pixel blocks, and only records the difference between the two, thereby greatly improving the image compression ratio and generating storage Image files with small space and good image quality. In the case of the same image quality, the WebP format is 40% smaller than the JPEG image file. [0003] For pictures in WebP format, under the condition of lossy compression, the content of the pictures in WebP format may be damaged during network transmission or storage. These damaged WebP pictures can only rely on ...

AI Technical Summary

Problems solved by technology

These damaged WebP pictures can only rely on the decoder for fault-tolerant processing, and when the fault-tolerant processing is not perfect, it may even cause abnormal decoders

The problem with the file was discovered only during the decoding stage of WebP. Since the decoding of the file consumes a lot of resources and takes a long time, this is a huge waste of computing resources.

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