Moving picture encoding/decoding system, moving picture encoding/decoding apparatus, moving picture encoding/decoding method, and recording medium

A moving picture encoding apparatus comprising:

• input image encoding means for encoding an input image signal including an image object;
• first storage means for storing the image signal including the image object;
• shape information encoding means for encoding shape information representing a shape of the image object to generate encoded shape information, and generating boundary information representing a boundary position of the image object;
• second storage means for storing the boundary information;
• and
• padding means for identifying an outer region of the image object in the image signal stored in said first storage means on the basis of the boundary information stored in said second storage means, calculating a pixel value to be substituted into the outer region, the calculating being performed using information from pixels at the boundary position and from no other pixels of the image object and substituting the pixel value into the outer region stored in said first storage means.

A moving picture decoding apparatus for performing padding processing comprising:

• image decoding means for referring to a reference image, and decoding encoded image data including an image object to generate a decoded image signal;
• first storage means for storing the decoded image signal and supplying the decoded image signal as a reference image in a next frame decoding processing to said image decoding means;
• shape information decoding means for decoding encoded shape information serving as encoded data of image object shape information to generate shape information, and generating boundary information representing a boundary position of the image object;
• second storage means for storing the boundary information;
• and
• padding means for identifying an outer region of the image object in the image signal stored in said first storage means on the basis of the boundary information stored in said second storage means, calculating a pixel value to be substituted into the outer region, the calculating being performed using information from pixels at the boundary position and from no other pixels of the image object and substituting the pixel value into the outer region stored in said first storage means.

A moving picture encoding/decoding method comprising:

• encoding an input image signal including an image object;
• storing the image signal including the image object in a first storage means;
• encoding shape information representing a shape of the image object to generate encoded shape information;
• generating boundary information representing a boundary position of the image object;
• storing the boundary information in a second storage means;
• and
• performing first padding processing by identifying an outer region of the image object in the image signal stored in the first storage means on the basis of the boundary information stored in the second storage means, calculating a pixel value to be substituted into the outer region the calculating being performed using information from pixels at the boundary position and from no other pixels of the image object, and substituting the pixel value into the outer region stored in the first storage means
• referring to a reference image, and decoding encoded image data including the image object to generate a decoded image signal;
• storing the decoded image signal in a third storage means;
• reading out the image signal from the third storage means as a reference image;
• decoding encoded shape information in the reference image to generate shape information;
• generating boundary information representing a boundary position of the image object;
• storing the boundary information in a fourth storage means;
• and
• performing second padding processing by identifying an outer region of the image object in the image signal stored in the third storage means on the basis of the boundary information stored in the fourth storage means, calculating a pixel value to be substituted into the outer region, the calculating being performed using information from pixels at the boundary position and from no other pixels of the image object, and substituting the pixel value into the outer region stored the third stored means.

A moving picture encoding method of performing padding processing comprising:

• encoding an input image signal including an image object;
• storing the image signal including the image object in a first storage means;
• encoding shape information representing a shape of the image object to generate encoded shape information;
• generating boundary information representing a boundary position of the image object;
• storing the boundary information in a second storage means;
• and
• performing padding processing by identifying an outer region of the image object in the image signal stored in the first storage means on the basis of the boundary information stored in the second storage means, calculating a pixel value to be substituted into the outer region, the calculating being performed using information from pixels at the boundary position and from no other pixels of the image object and substituting the pixel value into the outer region stored in the first storage means.

A moving picture decoding method of performing padding processing comprising:

• referring to a reference image, and decoding encoded image data including the image object to generate a decoded image signal;
• storing the decoded image signal in a first storage means;
• reading out the image signal stored in the first storage means as a reference image into a next frame decoding means;
• decoding encoded shape information in the reference image to generate shape information;
• generating boundary information representing a boundary position of the image object;
• storing the boundary information in a second storage means;
• and
• performing padding processing by identifying the outer region of the image object in the image signal stored in the first storage means on the basis of the boundary information stored in the second storage means, calculating a pixel value to be substituted into the outer region, the calculating being performed using information from pixels at the boundary position and from no other pixels of the image object and substituting the pixel value into the outer region stored in the first storage means.

A recording medium on which a moving picture encoding/decoding program is recorded, the program comprising:

• encoding an input image signal including an image object;
• storing the image signal including the image object in a first storage means;
• encoding shape information representing a shape of the image object to generate encoded shape information;
• generating boundary information representing a boundary position of the image object;
• storing the boundary information in second storage means;
• and
• performing first padding processing by identifying an outer region of the image object in the image signal stored in the first storage means on the basis of the boundary information stored in the second storage means, calculating a pixel value to be substituted into the outer region, the calculating being performed using information from pixels at the boundary position and from no other pixels of the image object and substituting the pixel value into the outer region stored in the first storage means;
• referring to a reference image, and decoding encoded image data including the image object to generate a decoded image signal;
• storing the decoded image signal in a third storage means;
• reading out the image signal stored in the third storage means as a reference image for a next frame decoding means;
• decoding encoded shape information in the reference image to generate shape information;
• generating boundary information representing a boundary position of the image object;
• storing the boundary information in a fourth storage means;
• and
• performing second padding processing by identifying an outer region of the image object in the image signal stored in the third storage means on the basis of the boundary information stored in the fourth storage means, calculating a pixel value to be substituted into the outer region the calculating being performed using information from pixels at the boundary position and from no other pixels of the image object, and substituting the pixel value into the outer region stored in the third storage means.

A recording medium on which a moving picture encoding program for performing padding processing is recorded, the moving picture encoding program causing a computer to perform the steps of:

• encoding an input image signal including an image object;
• storing the image signal including the image object in a first storage means;
• encoding shape information representing a shape of the image object to generate encoded shape information;
• generating boundary information representing a boundary position of the image object;
• storing the boundary information in a second storage means;
• and
• performing padding processing by identifying an outer region of the image object in the image signal stored in the first storage means on the basis of the boundary information stored in the second storage means, calculating a pixel value to be substituted into the outer region, the calculating being performed using information from pixels at the boundary position and from no other pixels of the image object and substituting the pixel value into the outer region stored in the first storage means.

A recording medium on which a moving picture decoding program for performing padding processing is recorded, the moving picture decoding program causing a computer to perform the steps of:

• referring to a reference image, and decoding encoded image data including the image object to generate a decoded image signal;
• storing the decoded image signal in a first storage means;
• reading out the image signal stored in the first storage means as a reference image in a next frame decoding means;
• decoding encoded shape information in the reference image to generate shape information;
• generating boundary information representing a boundary position of the image object;
• storing the boundary information in a second storage means;
• and
• performing padding processing by identifying the outer region of the image object in the image signal stored in the first storage means on the basis of the boundary information stored in the second storage means, calculating a pixel value to be substituted into the outer region, the calculating being performed using information from pixels at the boundary position and from no other pixels of the image object and substituting the pixel value into the outer region stored in the first storage means.