Image processing apparatus with free addrssing control
AssigneeRicoh Company, Ltd.
InventorYutaka Sato
Life of this patent
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Abstract
An image processing apparatus includes a wavelet transform unit which applies filtering to each of one or more images having a first size into which an original image is divided, thereby producing wavelet coefficients, a quantization unit which scans and quantizes the wavelet coefficients to produce quantization coefficients, and a coding unit which scans and encodes the quantization coefficients, wherein a number of pixels in one line for the filtering and a number of pixels in one line scanned for the quantization and the encoding are selectively changed, thereby encoding an image having a second size relatively small and of frequent use without division thereof into the one or more images having the first size.
Claims9
An image processing apparatus, comprising:
- a wavelet transform unit which applies filtering to each of one or more images having a first size into which an original image is divided, thereby producing wavelet coefficients;
- a quantization unit which scans and quantizes the wavelet coefficients to produce quantization coefficients;
- and
- a coding unit which scans and encodes the quantization coefficients, wherein a number of pixels in one line for said filtering and a number of pixels in one line scanned for the quantization and the encoding are selectively changed, thereby encoding an image having a second size relatively small and of frequent use without division thereof into the one or more images having the first size.
An image processing apparatus, comprising:
- an image memory of a first size;
- an address generation unit which receives information indicative of an image size, and generates addresses for accessing said image memory according to the information;
- and
- a transform unit which performs orthogonal transform on an image retrieved from said image memory at the addresses generated by said address generation unit, wherein said address generation unit generates addresses for accessing a memory area having the first size if said image memory stores therein an image having a first size, and generates addresses for accessing a memory area having a second size if said image memory stores therein an image having a second size.
A method of processing an image, comprising the steps of:
- providing an address generation unit which receives information indicative of an image size, and generates addresses for accessing an image memory according to the information;
- dividing an original image into one or more sub-regions having a predetermined size and one or more remaining regions;
- supplying the one or more sub-regions having the predetermined size to the image memory, and supplying information indicative of the predetermined size to the address generation unit;
- retrieving image data from the image memory by using addresses generated by the address generation unit in such a manner as to match the predetermined size, and performing orthogonal transform on the retrieved image data;
- supplying the one or more remaining regions to the image memory, and supplying information indicative of size of the one or more remaining regions to the address generation unit;
- and
- retrieving image data from the image memory by using addresses generated by the address generation unit in such a manner as to match the size of the one or more remaining regions, and performing orthogonal transform on the retrieved image data.
Dependencies are inferred from the claim text.