Non-linear quantization and similarity matching methods for retrieving image data
US7295718B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2001 |
| Grant date | Nov 13, 2007 |
| Priority date | — |
| Expiry date | Jan 20, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/5854
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for constructing a database having image information representing a plurality of images including the steps of: a) calculating L×5 number of normalized edge histogram bins to generate L number of edge histograms of a target image, wherein each edge histogram has five normalized edge histogram bins and represents a spatial distribution of five reference edges in a sub-image and L is a positive integer, wherein the reference edges include four directional edges and a non-directional edge; b) non-linearly quantizing the L×5 number of normalized edge histogram bins to generate L×5 number of quantization index values for the target image; c) storing the L×5 number of quantization index values to the database; and d) repeating the steps a) to c) until all of the stored images are processed to thereby construct the database having the image information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.