Digital image coding device and method
AssigneeNEC Corporation
InventorHayato Hagihara
Life of this patent
Estimating the term…
Abstract
A digital image coding device based on wavelet transform technology includes a lower-bitplane replacement section which is provided after a coefficient modeling section and before an arithmetic coding section. The coefficient modeling section converts wavelet coefficients into binary data composed of a plurality of bitplanes for each code-block. The lower-bitplane replacement section replaces a designated number of lower-order bitplanes of the plurality of bitplanes with zero to produce modified binary data. The designated number of low-order bitplanes is designated depending on a noise characteristic of the image capturing device. The arithmetic coding section codes bitplanes of the modified binary data.
Claims9
A device for coding a digital image signal inputted from an image capturing device based on wavelet transform, comprising:
- a coefficient modeling section for converting wavelet coefficients into binary data composed of a plurality of bitplanes for each code-block;
- a replacement section for replacing a designated number of lower-order bitplanes of the plurality of bitplanes with zero to produce modified binary data, wherein the designated number of low-order bitplanes is designated depending on a noise characteristic of the image capturing device;
- and
- an arithmetic coding section for coding bitplanes of the modified binary data.
A method for coding a digital image signal inputted from an image capturing device based on wavelet transform, comprising the steps of:
- converting wavelet coefficients into binary data composed of a plurality of bitplanes for each code-block;
- designating a number of low-order bitplanes of the plurality of bitplanes depending on a noise characteristic of the image capturing device;
- replacing a designated number of lower-order bitplanes with zero to produce modified binary data;
- and
- coding bitplanes of the modified binary data by arithmetic coding.
A computer program instructing a computer to coding a digital image signal inputted from an image capturing device based on wavelet transform, the computer program comprising the steps of:
- converting wavelet coefficients into binary data composed of a plurality of bitplanes for each code-block;
- designating a number of low-order bitplanes of the plurality of bitplanes depending on a noise characteristic of the image capturing device;
- replacing a designated number of lower-order bitplanes with zero to produce modified binary data;
- and
- coding bitplanes of the modified binary data by arithmetic coding.
Dependencies are inferred from the claim text.