7 terms
Banding in video quality is the visible stepping of smooth gradients into distinct bands, caused by too few tonal levels or heavy compression.
Blocking artifacts are visible square edges in compressed video, caused when a codec quantizes each block too coarsely at low bitrates.
Chroma subsampling reduces the resolution of color information in video while keeping full brightness detail, saving bandwidth with little visible loss.
Compression artifacts are visible distortions such as blocking, ringing and banding that lossy video codecs introduce when they discard image information.
PSNR (peak signal-to-noise ratio) is a video quality metric, in decibels, that measures pixel error between a compressed frame and its reference.
SSIM is a full-reference video quality metric that compares luminance, contrast and structure between a distorted image and its original.
VMAF is a full-reference video quality metric that fuses several image features with machine learning to predict perceived quality on a 0-100 scale.