Method for quantization of histogram bin value of image
AssigneeLG Electronics Inc.
InventorsJi Lee, Hyeon Kim
Life of this patent
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Abstract
A method for quantization of a color histogram bin value of an image or video, and more particularly, a method for non-uniform quantization of a color histogram bin value of an image (or video) according to the frequency of color occurrence is provided. The methods effectively represent the characteristics of a color histogram of an image in comparison to conventional art, and improve the performance of image retrieval when an image (video) retrieval search is conducted.
Claims5
A method of quantizing bin values of a color histogram, the method comprising:
- normalizing bin values by a maximum bin value;
- separating the normalized bin values into a plurality of regions;
- and
- uniformly quantizing each region, wherein the intervals of each region are quantized more finely closer to zero.
A method of describing a color image by non-uniform quantization of color histogram bin values for the image, comprising:
- normalizing bin values by a maximum bin value, whereby the normalized bin values range from 0 to 1;
- and
- non-uniformly quantizing each normalized bin value to an 8-bit value by dividing the range of normalized bin values into 6 regions, each region having a specific number of uniform quantization levels, wherein the specific number of uniform quantization levels in each of the 6 regions is 1, 25, 20, 35, 35 and 140, respectively.
A method of describing a color image by non-uniform quantization of color histogram bin values for the image, comprising:
- normalizing bin values by a maximum bin value, whereby the normalized bin values range from 0 to 1;
- and
- non-uniformly quantizing each normalized bin value to an 8-bit value by dividing the range of normalized bin values into 6 regions, wherein the threshold for each of the 6 regions is 0.000000001, 0.037, 0.08, 0.195, 0.32, respectively.
A method of generating a color histogram for an image, the color histogram containing a plurality of bins, the method comprising:
- accumulating bin values;
- normalizing bin values by a maximum bin value, whereby the normalized bin values range from 0 to 1;
- and
- non-uniformly quantizing each normalized bin value to an 8-bit value by dividing the range of normalized bin values into 6 regions, and allocating a different number of quantization levels to each region.
Dependencies are inferred from the claim text.