Compressed image information reading control method and device

Abstract

The invention discloses a compressed image information reading control method and device. According to the invention, corresponding header information is obtained and written into corresponding addresses of a buffer memory according to an image operation demand. therefore, during a decompression process, header information required can be output directly from the buffer memory, thereby avoiding time delay caused by calling and bus reading operation and improving image decompression efficiency. By adding the buffer memory outside a decompressor, a part of header information is pre-fetched and buffered through a new reading control logic, so that the reading frequency of the header information is effectively reduced, and the delay of the decompressor from sending a header information requestto returning compressed video data is reduced.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a method and device for controlling reading compressed image information. Background technique [0002] At present, video display technology has developed from standard definition, high definition (HD) to ultra high definition (4K, uHD), and the number of bits of a single color component of a single pixel has also increased from the traditional 8 bits to 10 bits or even 12 bits. For multimedia SOC, the improvement of video resolution and pixel bit count brings some side effects, such as video data storage requires more memory space, and data reading and writing to memory requires more memory bandwidth. And, since the data of each pixel may not be byte-aligned, how to store it efficiently becomes a problem. In view of these situations, video data needs to be compressed and decompressed in more and more scenarios. [0003] Video data compression is generally implemented based on...

AI Technical Summary

Problems solved by technology

[0005] However, the existing caching method has the problem of low efficiency when the video image needs to be rotated

For post-processing operations such as horizontal / vertical flip, if the header information is always cached in order from left to right and top to bottom without additional header information processing, it will cause frequent header information caches that need to be used in the decompression module. When a miss occurs, it is necessary to repeatedly cache the header information in different locations, resulting in a decrease in the reading efficiency of the compressed data header information and an increase in the delay in reading the compressed data

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