Image-encoding method, image-encoding device, and computer-readable recording medium storing image-encoding program

An image-encoding device that encodes an image having a resolution that is not a multiple of a size of a block to be encoded, comprising:

• a generator that adds an extension image to the image to generate an image to be encoded, the extension image being an image to be added to the image and being an image in which a boundary pixel that is present at a boundary between the extension image and the image, and an adjacent pixel that is adjacent to the boundary pixel have a difference in pixel value therebetween that has an absolute value that is equal to or greater than a certain value;
• and
• a deblocking filter unit that disables a deblocking filter process at the boundary between the extension image and the image in a locally decoded image that corresponds to the image to be encoded.

A computer-readable storage medium storing an image-encoding program that encodes an image having a resolution that is not a multiple of a size of a block to be encoded, the image-encoding program causing a computer to execute a process comprising:

• adding an extension image to the image to generate an image to be encoded, the extension image being an image to be added to the image and being an image in which a boundary pixel that is present at a boundary between the extension image and the image, and an adjacent pixel that is adjacent to the boundary pixel have a difference in pixel value therebetween that has an absolute value that is equal to or greater than a certain value;
• and
• disabling a deblocking filter process at the boundary between the extension image and the image in a locally decoded image that corresponds to the image to be encoded.