Patent ID: 8340182
Filing Date: 2012-12-25
Classification: H04N

Abstract:
1. A video decoding apparatus decoding a video stream which has been compressed and encoded, comprising: a prediction decoding unit which selectively generates one of an intra prediction image and an inter prediction image based on an encoding mode of a decoding object from the video stream and decoded images thereof; a residual decoding unit which generates a residual decoded image based on a quantization parameter of a decoding object from the video stream; an adding unit which generates a decoded image by adding an intra prediction image and an inter prediction image selectively generated by the prediction decoding unit, and a residual decoded image generated by the residual decoding unit; a filter process unit which applies deblocking filter process for reducing a block distortion onto a decoded image generated by the adding unit; a determining unit which determines whether or not a current processing load is high and which, if it is determined that the current processing load is high, extracts at least one of information on a quantization parameter and information on an encoding mode of a decoding object from the video stream, and which determines whether or not the filter process is skipped, based on extracted information thereof; and a skip processing unit which selectively omits the filter process based on a determined result of the determining unit wherein the determining unit specifies a central value of quantization parameters of the decoding object to be compared with a threshold value serving as a reference for determination, and carries out the skip determination based on a comparison result thereof, and as the threshold value serving as a reference of determination, an average value of the central values of quantization parameters in decoded past pictures or slices, or a value in which an offset value is added to the average value is used.