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AssigneeHudson Soft Co., Ltd.
InventorsFumihiko Itagaki, Miyuki Kawashima
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The invention relates to an image encoding/decoding method, apparatus thereof and a recording medium in which a program therefor is recorded, whereby the encoding/decoding can be obtained with high image quality at high speed. In an image encoding method which comprises producing a DC image composed of each block mean value by dividing an image data per B pixel into a block, making a part of said DC image a DC nest, and where the differential vector <dj> which is obtained by separating the DC value DCJ from the pixel block <Rj> to be encoded is over an allowable value Z, calculating one or more orthogonal basis (αk<Vk>), to which the differential vector is approximated, by the adaptive orthogonal transform (AOT) using the DC nest, each of the lowest n (n=log2 B) bits of base extraction blocks <Ui> which are down-sampled from the DC nest is set to 0. Further, base extraction vectors <ui> are produced by separating a block mean value ai from the base extraction blocks <Ui>.
In an image encoding method which comprises producing a DC image composed of each block mean value by dividing an image data per B pixel into a block, making a part of said DC image a DC nest, and where the differential vector which is obtained by separating the DC value from the pixel block to be encoded is over an allowable value, calculating one or more orthogonal basis, to which the differential vector is approximated, by the adaptive orthogonal transform using the DC nest, the improvement which comprises setting the lowest n (n=log2 B) bits of the DC pixels in each sample to 0, where the base extraction blocks are down-sampled from the DC nest and the block mean value thereof is calculated using the samples.
In an image encoding apparatus which comprises producing a DC image composed of each block mean value by dividing an image data per B pixel into a block, making a part of said DC image a DC nest, and where a differential vector which is obtained by separating the DC value from the pixel block to be encoded is over an allowable value, calculating one or more orthogonal basis, to which the differential vector is approximated, by the adaptive orthogonal transform using the DC nest, the improvement comprising a memory to store the DC nest in which the lowest n (n=log2 B) bits of the DC nest pixels are set to 0.
Dependencies are inferred from the claim text.