Image real-time decoding display method

Abstract

The present invention discloses an image real-time decoding display method. The method comprises an adaptive decoding method of using an open source FFMpeg video decoding base to design the H.264 compression data of different resolution ratios, and is suitable for automatically switching and displaying the H.264 image compression data of different resolution ratios coming from different channels in a spaceflight engineering in the same display area and by the same decoding method. In allusion to that the downloading frame frequencies of the H.264 image compression data of different channels in an actual moon exploration project are different, and the downloading frame frequencies of the H.264 image compression data of the same channel under different test requirements are different, a corresponding relationship of the frame frequency and the timing cycle of a timer is established according to the image refresh frequency requirements, and the automatic switching work under the different frame frequencies is realized by a plurality of high precision timers, thereby realizing the different image decoding display frequencies under the different frame frequencies, and improving the real-time performance of the image display.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an image real-time decoding and display method applied to aerospace engineering. Background technique [0002] H.264 video compression technology is a complex set of standards, so far there are only a few open-source decoding algorithm libraries, among which FFMpeg is one of the few open-source tools, and its decoding library has a relatively low The computational complexity is widely used. H.264 image compression technology has a very high data compression ratio. Under the same image quality conditions, the compression ratio of H.264 is more than 2 times that of MPEG-2 and 1.5 to 2 times that of MPEG-4. At the same time, H.264 has high-quality and smooth images while having a high compression ratio, so the image compression data technology of the image equipment of the Lunar Exploration Project adopts H.264 image compression technology. Therefore, the image decoding a...

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Problems solved by technology

[0003] In the existing technology, the image decoding and display of the lunar exploration project uses a professional image decoding card to decode H.264 image compression data with a fixed channel and fixed resolution, which cannot meet the needs of multiple channels and multiple resolutions in actual projects. Decoding and display requirements; at the same time, in actual projects, it is often necessary to temporarily switch the frame frequency of the image data frame download, and the image decoding card can only play according to the preset playback frequency, and cannot dynamically adjust the playback frequency, so it cannot be effective in real time Decoding and displaying images accurately brings a lot of inconvenience to the testing work of image equipment

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