Image encoding apparatus
AssigneeFujitsu Limited
InventorsKenichiro Sakai, Tsugio Noda
Life of this patent
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Abstract
An image encoding apparatus includes an extracting unit and a replacing unit. An image is subjected to quantized orthogonal transformation and quantization, and quantized orthogonal transform coefficients are grouped and encoded group-wise. The extracting unit extracts, from among a group of quantized orthogonal transform coefficients, those quantized orthogonal transform coefficients that are within a designated range starting from boundary values of the next lower group. The replacing unit replaces values of the quantized orthogonal transform coefficients extracted, with values of the quantized orthogonal transform coefficients of the next lower group.
Claims13
An image encoding apparatus that subjects an image to orthogonal transformation and quantization to obtain quantized orthogonal transform coefficients, groups the quantized orthogonal transform coefficients according to a predetermined size, and encodes the quantized orthogonal transform coefficients group by group, the image encoding apparatus comprising:
- an extracting unit that extracts from a group, the quantized orthogonal transform coefficients that fall within a designated range starting from boundary values of a next lower group;
- and
- a replacing unit that replaces values of the quantized orthogonal transform coefficients extracted, with values of the quantized orthogonal transform coefficients of a lower group.
An image encoding method comprising:
- subjecting an image to orthogonal transformation and quantization to obtain quantized orthogonal transform coefficients;
- grouping the quantized orthogonal transform coefficients according to a predetermined size;
- encoding the quantized orthogonal transform coefficients group by group;
- extracting from a group, the quantized orthogonal transform coefficients that fall within a designated range starting from boundary values of a next lower group;
- and
- replacing values of the quantized orthogonal transform coefficients extracted, with values of the quantized orthogonal transform coefficients of a lower group.
A computer-readable recording medium that records thereon a computer program for image encoding that includes subjecting an image to orthogonal transformation and quantization to obtain quantized orthogonal transform coefficients, grouping the quantized orthogonal transform coefficients according to a predetermined size, and encoding the quantized orthogonal transform coefficients group by group, the computer program including instructions, which when executed, cause a computer to execute:
- extracting from a group, the quantized orthogonal transform coefficients that fall within a designated range starting from boundary values of a next lower group;
- and
- replacing values of the quantized orthogonal transform coefficients extracted, with values of the quantized orthogonal transform coefficients of a lower group.
Dependencies are inferred from the claim text.