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EP0806733A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method and apparatus for multi-resolution image searching

Assignee: NEC Corp
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Filing: 1997-04-29
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Granted: —
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Expires: 2017-04-29
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Abstract

Abstract A multiresolution method and apparatus for searching of a database of images where the search is performed on compressed images, without first decompressing them. The method searches the database of compressed images first at a low resolution to obtain the relative quality of a match between a search template and a candidate image. If the match is below a particular threshold, the search is terminated without committing any further computational resources to the search. Conversely, if the match is above a particular threshold, the method enhances the resolution of the candidate image and then performs another match. As long as the relative quality of the match is above the particular threshold, the resolution of the candidate image is successively enhanced, until a match determination is made at a full resolution of the candidate image.

Inventors

  • 👤 Harold S. Stone

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 18:47
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/40; G06T3/4084; G06F; G06F16/00; G06F16/50; G06F16/58; G06F16/583; G06V; G06V10/00; G06V10/40; G06V10/42; G06V10/431; G06V30/00; G06V30/10; G06V30/24; G06V30/248; G06V30/2504

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 51 words
A content-based image search method comprising the steps of: transforming a pattern-template such that the transformed pattern template may be correlated with a wavelet candidate image; coarse-correlating said candidate image in the Fourier domain; and comparing said coarse-correlated candidate image with said pattern-template to determine if their exists a suitable match.
Claim 2
Dependent Claim 33 words
The method according to claim 1 further comprising the step of: medium-correlating said coarse-correlated candidate image; and comparing said medium-correlated candidate image with said pattern-template to determine if their exists a suitable match.
Claim 3
Dependent Claim 35 words
The method according to claim 1 or 2, further comprising the step of: fine-correlating said medium-correlated candidate image; and comparing said fine-correlated candidate image with said pattern-template to determine if their exists a suitable match.
Claim 4
Dependent Claim 36 words
The method according to claim 1, 2 or 3, further comprising the step of: fully-correlating said fine-correlated candidate image; and comparing said fully-correlated candidate image with said pattern-template to determine if their exists a suitable match.
Claim 5
Independent Claim 72 words
An apparatus for performing a content-based image search comprising: means for transforming a pattern template into a transformed pattern template such that said transformed pattern template may be correlated with a wavelet candidate image; means for coarse-correlating said candidate image in a Fourier domain; and means for comparing said coarse-correlated candidate image with said transformed pattern-template to determine if there exists a suitable match between the candidate image and the pattern template.
Claim 6
Dependent Claim 49 words
An apparatus for performing a content-based image search according to claim 5 further comprising: means for medium-correlating said coarse-correlated candidate image; and means for comparing said medium-correlated candidate image with said transformed pattern-template to determine if there exists a suitable match between the candidate image and the pattern template.
Claim 7
Dependent Claim 45 words
An apparatus according to claim 5 or 6, further comprising: means for fine-correlating said medium-correlated candidate image; and means for comparing said fine-correlated candidate image with said transformed pattern-template to determine if there exists a suitable match between the candidate image and the pattern template.
Claim 8
Dependent Claim 47 words
An apparatus according to claim 5, 6 or 7, further comprising : means for fully-correlating said fine-correlated candidate image; and means for comparing said fully-correlated candidate image with said transformed pattern-template to determine if there exists a suitable match between the candidate image and the pattern template.

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