Patent ID: 8711950
Filing Date: 2014-04-29
Classification: H04N

Abstract:
1. A picture processing apparatus for carrying out decoding processing to produce picture data from a MPEG-2 bit stream generated previously in processing performed typically by a coding apparatus to code said picture data by selection of setting of picture types from a frame structure of said picture data and from a field structure of said picture data and by execution of an orthogonal transform process for each orthogonal transform process unit of said picture data on a prediction error, which is a difference between a predicted value generated for each predicted-value generation unit of said picture data and the true value of said picture data, said picture processing apparatus comprising: an inverse orthogonal transform section configured to carry out an inverse orthogonal transform process as a part of said decoding processing in order to generate said prediction error; a predicted-value generation section configured to generate said predicted value; an addition section configured to carry out an addition operation as a part of said decoding processing so as to add said predicted value generated by said predicted-value generation section to said prediction error generated by said inverse orthogonal transform section as a result of said inverse orthogonal transform process in order to generate said picture data; a deblocking filter configured to carry out a filtering process of removing block noises from said picture data output by said addition section for the MPEG-2 bit stream as a result of said addition operation on the basis of filtering-location identifying information used for indicating the position of a subject of said filtering process, boundary-strength determination information used for indicating the strength of said fettering process and a quantization parameter; and a control section configured to set (a) said filtering-location identifying information, (b) said boundary-strength determination information and (c) said quantization parameter from said MPEG-2 bit stream and supplying said filtering-location identifying information, said boundary-strength determination information as well as said quantization parameter to said deblocking filter, wherein, when said control section determines a macroblock has a field structure, said control section set said boundary-strength determination information for vertical-direction inter-center-line gap filter processing by said deblocking filter, wherein said control section sets said boundary-strength determination information in accordance with whether an intra coding process or an inter-coding process has been carried out on adjacent predicted-value generation units and in accordance with whether or not a boundary between adjacent orthogonal transform process units coincides with a boundary between said predicted-value generation units and, wherein if prediction modes for generating said predicted values in adjacent orthogonal transform process units are different from each other, said control section sets said boundary-strength determination information so that said strength of said filtering process becomes large in comparison with a case in which said adjacent orthogonal transform process units have the same prediction mode.