Apparatus for encoding/decoding video signals to improve quality of a specific region

An image encoding apparatus for encoding input image signals which correspond to a movable image having a specific region and are sequentially input for every frame, comprising:

• region detecting means for detecting the specific region from said input image signals and outputting a region specifying signal for discriminating specific region from other regions;
• low-pass filter means for filtering in the space direction image signals so that image signals of regions other than said specific region will be filtered more strongly than the image signal of said specific region according to said region specifying signal;
• and
• coding means for orthogonal transformation coding of image signals output from said low-pass filter means.

An image encoding apparatus for encoding input image signals, comprising:

• region specifying means for outputting a region specifying signal to discriminate any specific region from other regions in said input image signals;
• low-pass filter means for selectively filtering in the space direction image signals of regions other than said specific region in said image signals;
• and
• coding means for orthogonal transformation coding of image signals output from said low-pass filter means.

An image encoding/decoding apparatus for encoding and transmitting input image signals at a transmitting side and decoding an encoded image signals at a receiving side, comprising:

• region specifying means for specifying a specific region in said input image signal and outputting a region specifying signal for discriminating the specific region from other regions in said input image signals;
• transmitting means for transmitting the region specifying signal output from said receiving side to said transmitting side;
• low-pass filter means for selectively filtering in the space direction image signals of regions other than the specific region, which are included said input image signals, according to said region specifying signal from the receiving side;
• and
• coding means for orthogonal transformation coding of image signal output from said low-pass filter means.

An image encoding apparatus for encoding input image signals, comprising:

• region specifying means for specifying a specific region in said input image signals and outputting a region specifying signal for discriminating the specific region from other regions in said image input signals;
• low-pass filter means for selectively filtering in the space direction image signals of said specific region, which are included in said input image signals, according to said region specifying signal;
• and
• coding means for orthogonal transformation coding of image signals output from said low-pass filter means.

An image encoding apparatus for encoding input image signals which correspond to a movable image having a specific region and are sequentially input for every frame, comprising:

• region detecting means for detecting the specific region from said input image signals and outputting a region specifying signal for discriminating said specific region from other regions;
• low-pass filter means for selectively filtering in the spatial direction and the temporal direction image signals of regions other than said specific region, which are included in said input image signals, according to said region specifying signal;
• subtractor means for producing interframe difference signals according to image signals output from said low-pass filter means;
• and
• coding means for orthogonal transformation coding of the interframe signals output from said subtractor means.