search for: jp4

Hi, just a small follow up of recent discussions about Elphel's JP4 format. I'm working with Andrey and fellows from Elphel to improve support for JP4 format in the context of Elphel's Apertus project (http://www.apert.us). As posted by Basil, on http://wiki.elphel.com/index.php?title=JP4 there is plenty of information about the format and how to post proc...

...ears ago I implemented limited functionality Theora in our cameras FPGA (it took me 6 month of hard labor), and then gave up - it is a very crowded space and it is difficult to compete with more advanced codecs. And for our other work we anyway need almost raw image data, so we are using JPEG-based JP4 format (https://community.elphel.com/jp4) that we originally developed for Google Books to compress raw Bayer mosaic images. Last few years we work with the thermal images that need 16 bit, so far uncompressed TIFF files. We need lossless 2:1 compression (current recording bandwidth is about half o...

Hi Andrey, Thank you for your answer.Actually, NHW is very low-power so I think it could be geared toward any hardware.But actually I don't have hardware skills, so NHW is not a real hardware project for now maybe? I agree with you that it is extremely difficult (for me) to build a community around NHW, I'm certainly very bad/underskilled at it.Any help is welcome! Cheers, Raphael Le

In the discussion of having a freedom-friendly camcorder or other video device, we discussed the idea of using intra-only Theora video to make post-recording editing a much easier process, allowing things like frame-by-frame editing without the need to decode and reencode the video again, thus incurring loss. I was quite skeptical of the efficiency of intra-only Theora, and I had speculated that