Image encoding device and method therefor, image decoding apparatus and method therefor, and computer-readable recorded medium on which image encoding program and image decoding program are recorded

An image coding apparatus comprising:

• a bit plane generator (303) dividing unitary image data into a plurality of bit planes determined according to the number of bits forming each pixel,
• an image preprocessor (305) connected to said bit plane generator (303) to combine said plurality of bit planes into a single bit plane so that pixels of high correlation belonging to different bit planes are pixels positioned in close proximity, and
• a data compressor (306) connected to said image preprocessor (305) to compress an image of said single bit plane according to a compression method taking advantage of a high correlation between pixels positioned in close proximity.

An image coding apparatus comprising:

• an image preprocessor (1503) arranging bit data of the same position forming a plurality of image data input continuously in close proximity to combine said plurality of image data into unitary image data, and
• a data compressor (1504) connected to said image preprocessor (1503) to compress an image of said unitary image data.

An image coding method comprising the steps of:

• dividing unitary image data into a plurality of bit planes determined depending on the number of bits forming each pixel (S1002),
• arranging bit data of the same position forming said plurality of bit planes in close proximity to combine said plurality of bit planes into a single bit plane (S1003), and
• compressing an image of said single bit plane (S1004).

An image coding method comprising the steps of:

• dividing unitary image data into a plurality of bit planes determined depending on the number of bits forming each pixel (S1002),
• combining said plurality of bit planes into a single bit plane so that pixels of high correlation belonging to different bit planes are pixels positioned in close proximity (S1003), and
• compressing an image of said single bit plane by a compression method taking advantage of a correlation between pixels positioned in close proximity (S1004).

An image coding method comprising the steps of:

• arranging bit data of the same position forming a plurality of image data input continuously in close proximity to combine said plurality of image data into unitary image data (S1702), and
• compressing an image of said unitary image data (S1703).

A computer-readable recording medium recorded with an image coding program causing a computer to execute the steps of:

• dividing unitary image data into a plurality of bit planes determined depending on the number of bits forming each pixel (S1002),
• arranging bit data of the same position forming said plurality of bit planes in close proximity to combine into a single bit plane (S1003), and
• compressing an image of said single bit plane (S1004).

A computer-readable recording medium recorded with an image coding program causing a computer to execute the steps of:

• dividing unitary image data into a plurality of bit planes determined depending on the number of bits forming each pixel (S1002),
• combining said plurality of bit planes into a single bit plane so that pixels of high correlation belonging to different bit planes are pixels positioned in close proximity (S1003) and
• compressing an image of said single bit plane by a compression method taking advantage of a correlation between pixels positioned in close proximity (S1004).

A computer-readable recording medium recorded with an image coding program causing a computer to execute the steps of:

• arranging bit data of the same position forming a plurality of image data input continuously in close proximity to combine said plurality of image data into unitary image data (S1702), and
• compressing an image of said unitary image data (S1703).