Patent ID: 7860159
Filing Date: 2010-12-28
Classification: H04N

Abstract:
1. A method of generating a quantization matrix that is used in inverse quantization, the method comprising: receiving a bitstream including a coded truncated quantization matrix obtained by truncating and coding a quantization matrix, wherein the quantization matrix includes a predetermined number of quantization elements comprising a transmitting part and a non-transmitting part, and wherein the coded truncated quantization matrix has first coded bits and second coded bits, the first coded bits comprising bits obtained by coding the transmitting part of quantization elements and the second coded bits comprising bits obtained by coding an end code; decoding the coded truncated quantization matrix until the second coded bits corresponding to the end code are read out, to obtain the transmitting part of quantization elements; obtaining at least one additional quantization element; and generating a complete quantization matrix by using the transmitting part of quantization elements and at least one additional quantization element; wherein the complete quantization matrix is generated by ordering the transmitting part of quantization elements and at least one additional quantization element in a zig-zag scan.