By Joseph Jason Gonzales
Read or Download Complicated Business: Chicanos, Museums, and Corporate Sponsors (Phd Thesis) PDF
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Extra resources for Complicated Business: Chicanos, Museums, and Corporate Sponsors (Phd Thesis)
3. Thresholding and quantization. This step takes into account the specificities of human vision, particularly the fact that the eye does not distinguish fine details below a certain luminance level. It consists of zeroing the coefficients below a predetermined threshold, and quantizing the remaining ones with decreasing accuracy as the frequency increases. Contrary to the 63 other (AC) coefficients, the DC coefficient is DPCM coded (differential pulse code modulation) relative to the DC coefficient of the previous block, which allows a more accurate coding with a given number of bits.
M is the distance (in number of pictures) between two successive P pictures. • N is the distance between two successive I pictures, defining a “group of pictures” (GOP). 15 Mb/s. 33%), 1/4 are P pictures (25%), and 2/3 are B pictures (66%); the global compression rate is maximized by the fact that the most frequent pictures have the highest compression rate. Re-ordering of the pictures It is obvious that the sequence of the pictures after decoding has to be in the same order as the original sequence before encoding.
The 4:2:0 format This format is obtained from the 4:2:2 format by using the same chroma samples for two successive lines, in order to reduce the 21 Digitization of video signals amount of memory required in processing circuitry while at the same time giving a vertical resolution of the same order as the horizontal resolution. Luminance and horizontal chrominance resolutions are the same as for the 4:2:2 format, and thus • luminance resolution: 720 × 576 (625 lines) or 720 × 480 (525 lines); • chrominance resolution: 360 × 288 (625 lines) or 360 × 240 (525 lines).