Search results
Results from the WOW.Com Content Network
The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.
Lossless codecs use curve fitting or linear prediction as a basis for estimating the signal. Parameters describing the estimation and the difference between the estimation and the actual signal are coded separately. [50] A number of lossless audio compression formats exist. See list of lossless codecs for a listing.
In data compression and psychoacoustics, transparency is the result of lossy data compression accurate enough that the compressed result is perceptually indistinguishable from the uncompressed input, i.e. perceptually lossless. A transparency threshold is a given value at which transparency is reached. It is commonly used to describe compressed ...
Lossless compression algorithms and their implementations are routinely tested in head-to-head benchmarks. There are a number of better-known compression benchmarks. Some benchmarks cover only the data compression ratio, so winners in these benchmarks may be unsuitable for everyday use due to the slow speed of the top performers. Another ...
Lossy or lossless: June 2013 Patent encumbered [52] Yes [II] Yes Yes [55] Yes Yes Yes [56] Yes Yes MPEG-4 AVC (H.264) Lossy or lossless: August 2004 Patent encumbered [57] Yes Yes Yes Yes Yes [III] Yes Yes [58] Yes AV1: Lossy or lossless: March 2018 Patent claims Yes [59] [60] Yes No No No No Planned No VP9: Lossy or lossless: June 2013 Patent ...
Lossy (and partly lossless), DCT, RLE, and Huffman predictive nearest neighbor Raster 8 bpc No No Yes Yes No No No Yes No No (see unofficial JPEG-HDR) Yes JPEG 2000: Lossy and lossless Raster 38 bpc No Yes Yes Yes No No No Yes — No Yes JPEG XL: Lossy and lossless (VarDCT mode, Modular mode) Raster 32 bpc Yes Yes Yes Yes Yes Yes Yes Yes Yes ...
ISO 29170 more specifically defines an algorithm as visually lossless "when all the observers fail to correctly identify the reference image more than 75% of the trials". [4]: 18 However, the standard allows for images that "exhibit particularly strong artifacts" to be disregarded or excluded from testing, such as engineered test images.
JPEG XS favors visually lossless quality in combination with low latency and low complexity, over date reduction through compression. It is not a direct competitor to alternative image codecs like JPEG 2000 and JPEG XL or video codecs like AV1, AVC/H.264 and HEVC/H.265 which tend to focus on compression efficiency. Other important features are: