US20140010442A1
Active / In Force
US
⏱️ 6.6 years remaining
Apparatus, method of controlling the same and storage medium
Assignee: Canon Inc
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Filing: 2013-06-19
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Granted: —
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Expires: 2033-06-19
Abstract
Abstract The present invention provides an apparatus for processing image data obtained by reading a document and a background image outside the document, and method of controlling the apparatus. The apparatus determines a degree of similarity between a color of the background image and a color of a marginal region of the document from the image data, sets a region extraction parameter based on the determined degree of similarity, and determines a document region by using the region extraction parameter from the image data.
Inventors
- 👤 Minako Kato
- 👤 Tetsuya Suwa
- 👤 Takashi Nakamura
- 👤 Yugo Mochizuki
- 👤 Masao Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:07
CPC Classifications
G06K9/6202; G; G06; G06V; G06V30/00; G06V30/40; G06V10/00; G06V10/20; G06V10/25; H; H04; H04N; H04N1/00; H04N1/00795; H04N1/00798; H04N1/00816; H04N1/04; H04N1/10; H04N1/1013; H04N1/19; H04N1/191; H04N1/192; H04N1/193; H04N2201/00; H04N2201/0077; H04N2201/0081; H04N2201/0091; H04N2201/0094
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
98 words
1 . An apparatus for processing image data obtained by reading a document and a background image outside the document, the apparatus comprising: a similarity determination unit configured to determine a degree of similarity between a color of the background image and a color of a marginal region of the document from the image data; a setting unit configured to set a region extraction parameter based on the degree of similarity determined by the similarity determination unit; and a document determination unit configured to determine a document region by using the region extraction parameter from the image data.
Claim 2
Dependent Claim
98 words
1 . An apparatus for processing image data obtained by reading a document and a background image outside the document, the apparatus comprising: a similarity determination unit configured to determine a degree of similarity between a color of the background image and a color of a marginal region of the document from the image data; a setting unit configured to set a region extraction parameter based on the degree of similarity determined by the similarity determination unit; and a document determination unit configured to determine a document region by using the region extraction parameter from the image data.
Claim 3
Dependent Claim
46 words
2 . The apparatus according to claim 1 , wherein the document determination unit determines the document region by quantizing filtered image data by using the region extraction parameter set by the setting unit after execution of filtering of the image data by a predetermined filter.
Claim 4
Dependent Claim
56 words
3 . The apparatus according to claim 2 , further comprising a decision unit configured to decide one of a plurality of filters in accordance with the degree of similarity determined by the similarity determination unit, wherein the document determination unit performs filtering for the image data by using a filter decided by the decision unit.
Claim 5
Dependent Claim
39 words
4 . The apparatus according to claim 1 , wherein the document determination unit determines the degree of similarity based on spectral reflectance spectra of a white portion of the background image and a white portion of the document.
Claim 6
Dependent Claim
37 words
5 . The apparatus according to claim 4 , wherein the similarity determination unit determines the degree of similarity depending on magnitudes of differences between R, G, and B output values based on the spectral reflectance spectra.
Claim 7
Dependent Claim
39 words
6 . The apparatus according to claim 1 , wherein the setting unit sets the region extraction parameter in a case in which the degree of similarity is higher as a parameter for extracting image data with low luminance.
Claim 8
Dependent Claim
36 words
7 . The apparatus according to claim 1 , wherein the document determination unit determines a document region based on image data obtained by executing filtering for the image data by using an edge enhancement filter.
Claim 9
Dependent Claim
27 words
8 . The apparatus according to claim 1 , wherein the document determination unit determines the document region based on luminance and/or chroma of the image data.
Claim 10
Dependent Claim
76 words
9 . A method of processing image data obtained by reading a document and a background image outside the document, the method comprising: determining a degree of similarity between a color of the background image and a color of a marginal region of the document from the image data; setting a region extraction parameter based on the determined degree of similarity; and determining the document region by using the region extraction parameter from the image data.
Claim 11
Dependent Claim
76 words
9 . A method of processing image data obtained by reading a document and a background image outside the document, the method comprising: determining a degree of similarity between a color of the background image and a color of a marginal region of the document from the image data; setting a region extraction parameter based on the determined degree of similarity; and determining the document region by using the region extraction parameter from the image data.
Claim 12
Dependent Claim
39 words
10 . The method according to claim 9 , wherein a document region is determined by quantizing filtered image data by using the set region extraction parameter after execution of filtering of the image data by a predetermined filter.
Claim 13
Dependent Claim
44 words
11 . The method according to claim 10 , wherein one of a plurality of filters is decided in accordance with the set degree of similarity, and a document region is determined by performing filtering for the image data by using a decided filter.
Claim 14
Dependent Claim
36 words
12 . The method according to claim 9 , wherein a degree of similarity is determined based on spectral reflectance spectra of a white portion of the background image and a white portion of the document.
Claim 15
Dependent Claim
34 words
13 . The method according to claim 12 , wherein a degree of similarity is determined depending on magnitudes of differences between R, G, and B output values based on the spectral reflectance spectra.
Claim 16
Dependent Claim
54 words
14 . The method according to claim 9 , wherein the region extraction parameter in a case in which the degree of similarity is high is set as a parameter for extracting image data with low luminance instead of the region extraction parameter in a case in which the degree of similarity is low.
Claim 17
Dependent Claim
33 words
15 . The method according to claim 9 , wherein a document region is determined based on image data obtained by executing filtering for the image data by using an edge enhancement filter.
Claim 18
Dependent Claim
24 words
16 . The method according to claim 9 , wherein the document region is determined based on luminance and/or chroma of the image data.
Claim 19
Dependent Claim
23 words
17 . A non-transitory computer-readable storage medium storing a program for causing a computer to execute a method defined in claim 9 .
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