Patent ID: 8345765

Claim:
A moving image coding distortion reduction apparatus comprising: a decoder configured to decode a coded moving image signal to obtain a decoded moving image signal, and output, as coding characteristic information, quantization information of a field or frame of the decoded moving image signal, that is obtained when the coded moving image signal is decoded; a motion detector configured to obtain a motion detection output indicating an inter-field or inter-frame motion of a field or frame of the decoded moving image signal; a coding distortion reduction module configured to receive the decoded moving image signal, the coding distortion reduction module having a ringing distortion reduction module that reduces a ringing distortion in the decoded moving image signal, and a block distortion reduction module that reduces a block distortion in the decoded moving image signal; and a coding distortion reduction controller configured to control the ringing distortion reduction module and the block distortion reduction module, wherein the coding distortion reduction controller increases an effect of the block distortion reduction module when the motion detection output indicates an increase in the inter-field or inter-frame motion of the field or frame of the decoded moving image signal or when the quantization information indicates an increase in a setting quantization step of the field or frame of the decoded moving image signal, and the coding distortion reduction controller increases an effect of the ringing distortion reduction module when the motion detection output indicates a decrease in the inter-field or inter-frame motion of the field or frame of the decoded moving image signal or when the quantization information indicates an increase in a setting quantization step of the field or frame of the decoded moving image signal.