Patent ID: 6987811
Filing Date: 2006-01-17
Classification: H03M,H04N

Abstract:
1. An image processor for decoding variable-length coded image data, comprising: a variable-length decoding unit for variable-length decoding said image data and outputting a pair of a run length of zero coefficients and a non-zero coefficient; an inverse quantization unit for subjecting said non-zero coefficient to inverse quantization to obtain inverse quantized data and outputting said inverse quantized data; a data storage unit for storing said inverse quantized data in a specified address; an address setting unit for conducting inverse scanning, obtaining said address for storing said inverse quantized data on the basis of the run length of zero coefficients and specifying said address in said data storage unit; a write information storage unit for setting a write flag in an address thereof corresponding to said address specified by said address setting unit; and a data reading unit for reading data from said data storage unit, and on the basis of information stored in said write information storage unit, directly outputting data from said address specified by said address setting unit while substituting a predetermined value for data from an address other than said address specified by said address setting unit to output the substituted value.