Image coding apparatus, image decoding apparatus, image coding method, image decoding method, and data storage medium

An image coding apparatus which receives an interlaced image signal comprising a color signal for color display of an object and a shape signal indicating a shape of the object and corresponding to the object included in an image space as an input and is operable to perform an adaptive coding process including a frame-by-frame motion compensation coding process and a field-by-field motion compensation coding process for the image signal in macroblock units each comprising a predetermined number of pixels into which the image space is divided, said apparatus comprising:

• a color motion vector coding unit operable to code either a frame-basis color motion vector or a field-basis color motion vector of a target macroblock to be coded which is used in either the frame-by-frame motion compensation coding process or the field-by-field motion compensation coding process for an interlaced color signal, based on its prediction value;
• and
• a shape motion vector coding unit operable to code a frame-basis shape motion vector of the target macroblock which is used in the frame-by-frame motion compensation coding process for an interlaced shape signal, based on its prediction value;
• wherein
• the shape motion vector coding unit includes a shape motion predictor which is operable to generate the prediction value of the shape motion vector of the target macroblock based on a color motion vector and a shape motion vector of a coded macroblock when the color motion vector of the coded macroblock is the frame-basis motion vector, and generate the prediction value of the shape motion vector of the target macroblock based on a frame-basis shape motion vector of the coded macroblock when the color motion vector of the coded macroblock is the field-basis motion vector.

An image coding apparatus which receives either an interlaced image signal or a non-interlaced image signal comprising a color signal for color display of an object and a shape signal indicating a shape of the object and corresponding to the object included in an image space as an input and is operable to perform an adaptive coding process including a frame-by-frame motion compensation coding process and a field-by-field motion compensation coding process for the image signal in macroblock units each comprising a predetermined number of pixels into which the image space is divided, said apparatus comprising:

• a color motion vector coding unit operable to code either a frame-basis color motion vector or a field-basis color motion vector of a target macroblock to be coded which is used in either a frame-by-frame motion compensation coding process or a field-by-field motion compensation coding process for a color signal, based on its prediction value;
• and
• a shape motion vector coding unit operable to code a frame-basis shape motion vector of the target macroblock which is used in the frame-by-frame motion compensation coding process for a non-interlaced shape signal, based on its prediction value;
• wherein
• said shape motion vector coding unit includes a shape motion vector predictor operable to generate the prediction value of the shape motion vector of the target macroblock based on a color motion vector and a shape motion vector of a coded macroblock when the non-interlaced image signal is received as the image signal, and generate the prediction value of the shape motion vector of the target macroblock based on a frame-basis shape motion vector of the coded macroblock when the interlaced image signal is received as the image signal.

An image decoding apparatus which receives a coded image signal corresponding to an interlaced image signal comprising a color signal for color display of an object and a shape signal indicating a shape of the object and corresponding to the object included in an image space as an input and is operable to perform an adaptive decoding process including a frame-by-frame motion compensation decoding process and a field-by-field motion compensation decoding process for the coded image signal in macroblock units each comprising a predetermined number of pixels into which the image space is divided, said apparatus comprising:

• a color motion vector decoding unit operable to decode either a frame-basis color motion vector or a field-basis color motion vector of a target macroblock to be decoded which is used in either the frame-by-frame motion compensation decoding process or the field-by-field motion compensation decoding process for a coded signal of an interlaced color signal, based on its prediction value;
• and
• a shape motion vector decoding unit operable to decode a frame-basis shape motion vector of the target macroblock which is used in the frame-by-frame motion compensation decoding process for a coded signal of an interlaced shape signal, based on a prediction value obtained from a color motion vector and a shape motion vector of a decoded macroblock, wherein:
• said color motion vector decoding unit includes a motion vector conversion device operable to convert field-basis color motion vectors of the decoded macroblock into a frame-basis color motion vector of the decoded macroblock;
• and
• said shape motion vector decoding unit includes a shape motion vector predictor operable to generate the prediction value of the shape motion vector of the target macroblock based on the frame-basis shape motion vector of the decoded macroblock and the frame-basis color motion vector of the decoded macroblock output from said motion vector conversion device when the color motion vector of the decoded macroblock is the field-basis motion vector.

An image decoding apparatus which receives a coded image signal corresponding to an interlaced image signal comprising a color signal for color display of an object and a shape signal indicating a shape of the object and corresponding to the object included in an image space as an input and is operable to perform an adaptive decoding process including a frame-by-frame motion compensation decoding process and a field-by-field motion compensation decoding process for the coded image signal in macroblock units each comprising a predetermined number of pixels into which the image space is divided, said apparatus comprising:

• a color motion vector decoding unit operable to decode either a frame-basis color motion vector or a field-basis color motion vector of a target macroblock to be decoded which is used in either a frame-by-frame motion compensation decoding process or a field-by-field motion compensation decoding process for a coded signal of an interlaced color signal, based on its prediction value;
• and
• a shape motion vector decoding unit operable to decode a frame-basis shape motion vector of the target macroblock which is used in the frame-by-frame motion compensation decoding process for a coded signal of an interlaced shape signal, based on its prediction value, wherein:
• said shape motion vector decoding unit includes a shape motion vector predictor operable to generate the prediction value of the shape motion vector of the target macroblock based on a color motion vector and a shape motion vector of a decoded macroblock when the color motion vector of the decoded macroblock is the frame-basis motion vector, and generate the prediction value of the shape motion vector of the target macroblock based on a frame-basis shape motion vector of the decoded macroblock when the color motion vector of the decoded macroblock is the field-basis motion vector.

An image decoding apparatus which receives a coded image signal corresponding to either an interlaced image signal or a non-interlaced image signal comprising a color signal for color display of an object and a shape signal indicating a shape of the object and corresponding to the object included in an image space as an input and is operable to perform an adaptive decoding process including a frame-by-frame motion compensation decoding process and a field-by-field motion compensation decoding process for the coded image signal in macroblock units each comprising a predetermined number of pixels into which the image space is divided, said apparatus comprising:

• a color motion vector decoding unit operable to decode either a frame-basis color motion vector or a field-basis color motion vector of a target macroblock to be decoded which is used in either a frame-by-frame motion compensation decoding process or a field-by-field motion compensation decoding process for a coded signal of the color signal, based on its prediction value;
• and
• a shape motion vector decoding unit operable to decode a frame-basis shape motion vector of the target macroblock which is used in the frame-by-frame motion compensation decoding process for a coded signal of a non-interlaced shape signal, based on its prediction value, wherein:
• said shape motion vector decoding unit includes a shape motion vector predictor operable to generate the prediction value of the shape motion vector of the target macroblock based on a color motion vector and a shape motion vector of a decoded macroblock when the coded image signal of the non-interlaced image signal is received as the coded image signal, and generate the prediction value of the shape motion vector of the target macroblock based on a frame-basis shape motion vector of the decoded macroblock when the coded image signal of the interlaced image signal is received as the coded image signal.

An image coding method for coding an interlaced image signal corresponding to an object included in an image space in macroblock units each comprising a predetermined number of pixels into which the image space is divided, by performing an adaptive coding process including a frame-by-frame motion compensation coding process and a field-by-field motion compensation coding process, said method comprising:

• a shape motion vector coding for coding a shape motion vector which is used in a frame-by-frame motion compensation coding process for an interlaced shape signal indicating a shape of an object included in the image signal in macroblock units, based on its prediction value;
• and
• a color motion vector conversion for converting field-basis color motion vectors used in a field-by-field motion compensation coding process for an interlaced color signal for color display of an object included in the image signal into a frame-basis color motion vector, wherein:
• in said shape motion vector coding, the prediction value of the shape motion vector of the target macroblock is generated with reference to a frame-basis color motion vector obtained by converting a color motion vector of a coded macroblock in said color motion vector conversion when the prediction value is generated with reference to the shape motion vector and the color motion vector of the coded macroblock and the color motion vector of the coded macroblock is the field-basis motion vector.

An image coding method for coding an interlaced image signal corresponding to an object included in an image space in macroblock units each comprising a predetermined number of pixels into which the image space is divided, by performing an adaptive coding process including a frame-by-frame motion compensation coding process and a field-by-field motion compensation coding process, said method comprising:

• a color motion vector coding for coding either a frame-basis color motion vector or a field-basis color motion vector which is used in either a frame-by-frame motion compensation coding process or a field-by-field motion compensation coding process for an interlaced color signal for color display of the object included in the image signal in macroblock units, based on its prediction value;
• and
• a shape motion vector coding for coding a shape motion vector which is used in the frame-by-frame motion compensation coding process for an interlaced shape signal indicating a shape of the object included in the image signal in macroblock units, based on its prediction value, wherein the prediction value of the shape motion vector of a target macroblock to be coded is generated with reference to a shape motion vector and a color motion vector of a coded macroblock when the color motion vector of the coded macroblock is the frame-basis motion vector, and the prediction value of the shape motion vector of the coded macroblock is generated with reference to the shape motion vector of the coded macroblock when the color motion vector of the coded macroblock is the field-basis motion vector.

An image coding method for coding an interlaced image signal or a non-interlaced image signal corresponding to an object included in an image space in macroblock units each comprising a predetermined number of pixels into which the image space is divided, by performing an adaptive coding process including a frame-by-frame motion compensation coding process and a field-by-field motion compensation coding process, said method comprising:

• a color motion vector coding for coding either a frame-basis color motion vector or a field-basis color motion vector which is used in either a frame-by-frame motion compensation coding process or a field-by-field motion compensation coding process for a color signal for color display of the object included in the image signal in macroblock units, based on its prediction value;
• and
• a shape motion vector coding for coding a shape motion vector which is used in the frame-by-frame motion compensation coding process for a non-interlaced shape signal indicating a shape of the object included in the image signal in macroblock units, based on its prediction value, wherein:
• the prediction value of the shape motion vector of a target macroblock to be coded is generated with reference to a shape motion vector and a color motion vector of a coded macroblock when the image signal is the non-interlaced image signal;
• and
• the prediction value of the shape motion vector of the target macroblock is generated with reference to the shape motion vector of the coded macroblock when the image signal is the interlaced image signal.

An image decoding method for decoding a coded image signal of an interlaced image signal corresponding to an object included in an image space in macroblock units each comprising a predetermined number of pixels into which the image space is divided, by performing an adaptive decoding process including a frame-by-frame motion compensation decoding process and a field-by-field motion compensation decoding process, said method comprising:

• a shape motion vector decoding for decoding a shape motion vector which is used in a frame-by-frame motion compensation decoding process for a coded signal of an interlaced shape signal indicating a shape of the object included in the image signal in macroblock units, based on its prediction value;
• and
• a color motion vector conversion for converting field-basis color motion vectors used in a field-by-field motion compensation decoding process for a coded signal of an interlaced color signal for color display of the object included in the image space into a frame-basis color motion vector, wherein:
• in said shape motion vector decoding, the prediction value of the shape motion vector of a target macroblock to be decoded is generated with reference to a frame-basis color motion vector obtained by converting a color motion vector of a coded macroblock in said color motion vector conversion when the prediction value is generated with reference to the shape motion vector and the color motion vector of the coded macroblock and the color motion vector of the coded macroblock is the field-basis motion vector.

An image decoding method for decoding a coded image signal of an interlaced image signal corresponding to an object included in an image space in macroblock units each comprising a predetermined number of pixels into which the image space is divided, by performing an adaptive decoding process including a frame-by-frame motion compensation decoding process and a field-by-field motion compensation decoding process, said method comprising:

• a color motion vector decoding for decoding either a frame-basis color motion vector or a field-basis color motion vector which is used in either a frame-by-frame motion compensation decoding process or a field-by-field motion compensation decoding process for a coded signal of an interlaced color signal for color display of the object included in the image signal in macroblock units, based on its prediction value;
• and
• a shape motion vector decoding for decoding a shape motion vector which is used in the frame-by-frame motion compensation decoding process for a coded signal of an interlaced shape signal indicating a shape of the object included in the image signal in macroblock units, based on its prediction value, wherein:
• the prediction value of the shape motion vector of a target macroblock to be decoded is generated with reference to a shape motion vector and a color motion vector of a decoded macroblock when the color motion vector of the decoded macroblock is the frame-basis motion vector, and the prediction value of the shape motion vector of the target macroblock is generated with reference to the shape motion vector of the decoded macroblock when the color motion vector of the decoded macroblock is the field-basis motion vector.

An image decoding method for decoding a coded image signal of an interlaced image signal or a non-interlaced image signal corresponding to an object included in an image space in macroblock units each comprising a predetermined number of pixels into which the image space is divided, by performing an adaptive decoding process including a frame-by-frame motion compensation decoding process and a field-by-field motion compensation decoding process, said method comprising:

• a color motion vector decoding for decoding either a frame-basis color motion vector or a field-basis color motion vector which is used in either a frame-by-frame motion compensation decoding process or a field-by-field motion compensation decoding process for a coded signal of a color signal for color display of the object included in the image signal in macroblock units, based on its prediction value;
• and
• a shape motion vector decoding for decoding a shape motion vector which is used in the frame-by-frame motion compensation decoding process for a coded signal of a non-interlaced shape signal indicating a shape of the object included in the image signal in macroblock units, based on its prediction value, wherein:
• the prediction value of the shape motion vector of a target macroblock to be decoded is generated with reference to a shape motion vector and a color motion vector of a decoded macroblock when the coded image signal is the coded image signal of the non-interlaced image signal;
• and
• the prediction value of the shape motion vector of the target macroblock is generated with reference to the shape motion vector of the decoded macroblock when the coded image signal is the coded image signal of the interlaced image signal.