Lossy + lossless = lossy. Lossy formats like JPEG and MPEG have a lossy stage where they extract the features visible to the human eye, followed by lossless compression of those features. Decompression consists of decompressing the features followed by finding an image or video that reproduces the same features.
A simple example is dropping the least significant pixel bits by rounding and replacing them with 0 bits. JPEG and the I frames of MPEG do this with DCT coefficients of color transformed pixel blocks because sensitivity to detail depends on spatial frequency and color. A more complex example would be replacing a movie with a compressed script, and creating a new movie from this script. On Mon, Nov 15, 2021, 9:36 AM John Rose <[email protected]> wrote: > What about this James, you're receiving a video stream over TCP, no sound, > 30 frames per second. Even frames are lossless PNG, odd frames are lossy > but visually lossless JPG. How is that overloading lossy and lossless? It's > a hybrid stream. You could say there is a strict demarcation between frame > packets. OK, modify the frames such that the lossy frames analog blend into > and out of the PNG frames by adjusting the lossyness up to bit boundaries > and by adding regions of increasing losslessness at the boundaries. You’d > have to the modify the JPG code… Does that break any rules? > *Artificial General Intelligence List <https://agi.topicbox.com/latest>* > / AGI / see discussions <https://agi.topicbox.com/groups/agi> + > participants <https://agi.topicbox.com/groups/agi/members> + > delivery options <https://agi.topicbox.com/groups/agi/subscription> > Permalink > <https://agi.topicbox.com/groups/agi/T5ff6237e11d945fb-M52acfbe8bfbf014b8535f893> > ------------------------------------------ Artificial General Intelligence List: AGI Permalink: https://agi.topicbox.com/groups/agi/T5ff6237e11d945fb-M0d1e0ea24cc882b334f7346d Delivery options: https://agi.topicbox.com/groups/agi/subscription
