Patent ID: 9071846
Filing Date: 2015-06-30
Classification: H04N

Abstract:
1. A moving picture encoding method executed by using an encoder for performing a multi-frame motion prediction with reference to a plurality of picture frames, comprising: selecting reference frames from a plurality of reference frames which are used for the multi-frame motion prediction of a subject frame to be encoded, the subject frame to be encoded and the plurality of reference frames having a same picture frame type; encoding by said encoder the selected reference frames in a higher picture quality than others of the plurality of reference frames of the same picture type; and arranging the frames encoded in the higher picture quality at constant frame intervals, wherein said selecting comprises: calculating differential information and motion information between each respective subject frame to be encoded and each corresponding one of the plurality of reference frames; calculating a linear sum of the differential information and the motion information to determine an inter-frame cost for each subject frame to be encoded between the each subject frame to be encoded and a reference frame which is used for encoding the each subject frame to be encoded; and selecting reference frames to be encoded in the higher picture quality based on the linear sum.