Patent ID: 8938005
Filing Date: 2015-01-20
Classification: H04N

Abstract:
1. An image encoding apparatus which encodes picture data, the apparatus comprising: an encoding unit configured to encode a picture to be encoded by orthogonally transforming and quantizing the picture; a decoding unit configured to decode an encoded picture by inverse-quantizing and inverse-orthogonally transforming the encoded picture; a signal-to noise (SN) ratio calculation unit configured to calculate an SN ratio using both of picture data not yet processed by said encoding unit and picture data processed by said decoding unit; a setting unit configured to set a target SN ratio serving as an index of the SN ratio; a control unit configured to control a quality of the picture encoded by said encoding unit based on a difference between the SN ratio calculated by said SN ratio calculation unit and the target SN ratio set by said setting unit; and a motion detection unit configured to detect motion information between the picture to be encoded and another picture, wherein said control unit determines whether the picture to be encoded is a static picture and when pictures to be encoded are predetermined number of continuous static pictures, said control unit controls the quality of the encoded picture to be improved stepwise for every picture, said control unit includes a determination unit which determines the picture to be encoded as the static picture when an amount of motion indicated by the motion information is not more than a predetermined value, and said control unit controls the target SN ratio set by said setting unit to adjust the target SN ratio based on a count value representing the number of static pictures determined by said determination unit.