EP1087614A2
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EP
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Apparatus and method for automatic color correction
Assignee: NEC Corp
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Filing: 2000-09-22
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Granted: —
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Expires: 2020-09-22
Abstract
Abstract In a color correction apparatus 1, a representative color extracting unit 13 reads from an object color information memory 12 a hue distributable region of an object selected by an object selecting unit 11 and the distribution frequency in each split hue region to extract a representative color. A color correction parameter determining unit 15 determines from the memory content of a color correction parameter memory 14 optimum color correction parameters adapted to the representative color extracted by the representative color extracting unit 13. A color correction processing unit 16 carries out, upon an input image, color correction acting only upon the representative color of the object and neighborhood colors therearound.
Inventors
- 👤 Masato Tsukada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 02:00
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/62; H04N1/628; H04N1/6075
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
An automatic color correction apparatus for carrying out color
correction upon a specific object in a color image, said apparatus
comprising an object color information memory for memorizing split hue
regions obtained by splitting a hue distributable region of the specific
object as well as a distribution frequency; representative color extracting
means for extracting a representative color of the specific object from a
given input image with reference to the memory content of the object color
information memory; a color correction parameter memory for memorizing
color correction parameters assigned to the split hue regions; color
correction parameter determining means for determining from the memory
content of the color correction parameter memory an optimum color
correction parameter adapted to the representative color extracted by the
representative color extracting means, and color correction processing
means for carrying out color correction conversion acting only upon a
specific hue by the use of the optimum color correction parameter
determined by the color correction parameter determining means.
Claim 2
Dependent Claim
156 words
An automatic color correction apparatus as claimed in claim 1,
further comprising: an extended object color information memory for memorizing split
regions obtained by splitting a distributable range related to a hue, the
saturation, or the brightness of the specific object or a combination thereof
obtained by analyzing a plurality of images preliminarily picked up for the
specific object under various image pickup environments as well as the
distribution frequency; said representative color extracting means obtaining a histogram
of the hue, the saturation, or the brightness of the specific object in the
input image or the combination thereof with reference to the split regions
related to the hue, the saturation, the brightness, or a combination thereof,
multiplying the distribution frequency memorized in said extended object
color information memory by the histogram, and extracting as the
representative color of the specific object a color present in a region
having a maximum value as a result of multiplication.
Claim 3
Dependent Claim
59 words
An automatic color correction apparatus as claimed in claim 1,
wherein the representative color extracting means extracts the
representative color of the specific object by the use of the variance of
coordinate positions in the image in addition to the distribution frequency
related to a hue, the saturation, or the brightness of the specific object or a
combination thereof.
Claim 4
Dependent Claim
60 words
An automatic color correction apparatus as claimed in claim 1
wherein the color correction parameter memory memorizes the color
correction parameters assigned not only to the split hue regions of the
specific object but also to spilt saturation regions and split brightness
regions obtained by splitting a saturation distributable region and a
brightness distributable region of the specific object, respectively.
Claim 5
Dependent Claim
114 words
An automatic color correction apparatus as claimed in claim 1,
further comprising an input-dependent object color information memory for
memorizing with respect to each individual input apparatus split regions
obtained by splitting a distributable range related to a hue, the saturation, or
the brightness of the specific object or a combination thereof as well as the
distribution frequency, an output-dependent color correction parameter
memory for holding the color correction parameter with respect to each
individual output apparatus, and input/output apparatus selecting means
supplied from the outside with the type of an input/output color image
processing apparatus for reading corresponding information from said
input-dependent object color information memory and said output-dependent
color correction parameter memory.
Claim 6
Dependent Claim
87 words
An automatic color correction apparatus as claimed in claim 1,
further comprising a sample image memory for memorizing a plurality of
kinds of sample color images of the specific object, manual color
correction processing means responsive to external instruction for
entering color information of said color images memorized in said sample
image memory, and color correction parameter generating means for
generating the color correction parameters to be memorized in the color
correction parameter memory with reference to the information supplied
from the manual color correction processing means.
Claim 7
Dependent Claim
106 words
An automatic color correction method for carrying out color
correction upon a specific object in a color image, said method comprising
the steps of extracting a representative color of the specific object from a
given input image, determining, with reference to the content of a color
correction parameter memory for memorizing color correction parameters
assigned to split hue regions obtained by splitting a hue distributable
region of the specific object, an optimum color correction parameter
adapted to the representative color extracted in the preceding step, and
carrying out color correction conversion acting only upon a specific hue by
the use of the optimum color correction parameter.
Claim 8
Dependent Claim
60 words
An automatic color correction method as claimed in claim 7,
wherein the color correction parameter memory memorizes the color
correction parameters assigned not only to the split hue regions of the
specific object but also to split saturation regions and split brightness
regions obtained by splitting a saturation distributable region and a
brightness distributable region of the specific object, respectively.
Claim 9
Dependent Claim
61 words
An automatic color correction method as claimed in claim 7,
wherein the step of extracting the representative color extracts the
representative color of the specific object by the use of the variance of
coordinate positions in the image in addition to the distribution frequency
related to a hue, the saturation, or the brightness of the specific object, or a
combination thereof.
Claim 10
Dependent Claim
121 words
A recording medium storing an automatic color correction
control program for controlling an automatic color correction apparatus to
carry out color correction upon a specific object in a color image, said
automatic color correction control program controlling the automatic color
correction apparatus to make the automatic color correction apparatus
carry out operations of extracting from a given input image a
representative color of the specific object, assigning color correction
parameters to split hue regions obtained by splitting a hue distributable
region of the specific object, determining an optimum color correction
parameter adapted to the representative color extracted as mentioned
above, and carrying out color correction conversion acting only upon a
specific hue by the use of the optimum color correction parameter.
References Cited (Backward Citations)
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