CrImage::JPEG::Reader
Inherits Reference / Object
JPEG (Joint Photographic Experts Group) image decoder
Implements JPEG decoding for baseline and progressive DCT modes. Supports grayscale and YCbCr color spaces with various subsampling ratios.
Constants
ZIGZAG = [0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63]
Zigzag order for dequantization