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gstreamer_video_compression [2020/04/16 01:50] wf68spef created |
gstreamer_video_compression [2020/04/17 10:49] (current) wf68spef |
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| To be able to efficiently send the image data over a wireless datalink, one option is to compress the video data using h264/h265 encoders. Those two are often implemented in a hardware-accelerated way on the onboard computers like RPI and Jetson Nano. We can use these encoders to compress the video data to about 1000kBit/s and keep some kind of acceptable quality in the images to be processed by the image analysis algorithms ( to be tested! ) on a basestation computer. | To be able to efficiently send the image data over a wireless datalink, one option is to compress the video data using h264/h265 encoders. Those two are often implemented in a hardware-accelerated way on the onboard computers like RPI and Jetson Nano. We can use these encoders to compress the video data to about 1000kBit/s and keep some kind of acceptable quality in the images to be processed by the image analysis algorithms ( to be tested! ) on a basestation computer. | ||
| + | These kind of compression is also used in existing solutions mentioned in https://www.hs-augsburg.de/homes/beckmanf/dokuwiki/doku.php?id=searchwing-wifibroadcast. | ||
| ====== Tests ====== | ====== Tests ====== | ||
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| Images are still looking okay for a human beeing. If the algorithms are also okay with that reduced quality need to be tested. | Images are still looking okay for a human beeing. If the algorithms are also okay with that reduced quality need to be tested. | ||
| + | {{ :comparison.png?1000 |}} | ||
| - | H264s filesize is in line with to the specified bitrate. H265 somehow is ~4x bigger that the specified bitrate, there is still some error to find. | + | H264s filesize is in line with to the specified bitrate. H265 somehow is ~4x bigger that the specified bitrate and also the quality is not really better than H264, so there are still some errors to find. Ìý |
| + | Ìý | ||
| + | Testimages and results can be found here: https://cloud.hs-augsburg.de/s/sm6taLQCAyWMY6FÌý | ||
| + | Ìý | ||
| + | ====== Image compression in general ======Ìý | ||
| + | Ìý | ||
| + | * [[https://ieeexplore.ieee.org/document/818515|Comparison of lossless image compression algorithms]] | ||