QCIF (Quarter Common source Intermediate Format)
1/4 CIF, i.e., luminance information is coded at 144 lines and 176 pixels per line. The
uncompressed bit rates for transmitting QCIF at 29.97 frames/sec is 9.115 Mbps. Quantization matrix
A set of 64 8-bit values used by a dequantizer.
Quantize
A step in the process of converting an analog signal into a digital signal. Quantization
measures a sample to determine a representative numerical value that is then encoded. The
three steps in analog-to-digital conversion are sampling, quantizing, and encoding.
Quantized
DCT coefficients
DCT coefficients before dequantization. A variable-length-coded representation of
quantized DCT coefficients is stored as part of a compressed video bitstream.
Quantizer
scale
A scale factor coded in a bitstream and used by the decoding process to scale the
dequantization. See scaling.
|
