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US 7,609,899 B2Granted
Image processing apparatus, image processing method, and recording medium thereof to smooth tile boundaries
AssigneeRicoh Company, Ltd.
InventorTooru Suino
Life of this patent
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Abstract
An image processing apparatus is disclosed. The image processing apparatus includes a coefficient correction unit for correcting only a high frequency coefficient situated adjacent to a tile boundary of an encoded image data divided into non-overlapping tiles. The high frequency coefficient is corrected during a process of decoding the encoded image data.
Claims4
An image processing apparatus comprising:
- a coefficient correction unit to correct a first high frequency coefficient situated adjacent to a tile boundary of an encoded image data divided into non-overlapping tiles, and a second high frequency coefficient situated in the vicinity of but not adjacent to the tile boundary;
- wherein the first and second high frequency coefficients are corrected during a process of decoding the encoded image data;
- wherein the coefficient correction unit is operable to adaptively exclude the second high frequency coefficient from the correction according to the number of quantization steps of the second high frequency coefficient.
An image processing method comprising:
- using a processor to perform:
- correcting a first high frequency coefficient situated adjacent to a tile boundary of an encoded image data divided into non-overlapping tiles, and a second high frequency coefficient situated in the vicinity of but not adjacent to the tile boundary;
- wherein the first and second high frequency coefficients are corrected during a process of decoding the encoded image data;
- wherein the second high frequency coefficient is adaptively excluded from correction, when correcting the first and second frequency coefficients, according to at least one of the number of quantization steps of the second high frequency coefficient and the value of the second high frequency coefficient.
1 more element
A computer readable medium storing a program for causing a computer to execute an image processing method, the image processing method comprising:
- correcting a first high frequency coefficient situated adjacent to a tile boundary of an encoded image data divided into non-overlapping tiles, and a second high frequency coefficient situated in the vicinity of but not adjacent to the tile boundary;
- wherein the first and second high frequency coefficients are corrected during a process of decoding the encoded image data;
- wherein the second high frequency coefficient is adaptively excluded from correction, when correcting the first and second frequency coefficients, according to at least one of the number of quantization steps of the second high frequency coefficient and the value of the second high frequency coefficient.
Dependencies are inferred from the claim text.