US 2014/0176596 A1 · METHOD AND SYSTEM FOR DYNAMIC BRIGHTNESS CORRECTION IN DIGITAL IMAGES

Abstract

This disclosure generally relates to digital image and video signal processing, and more particularly to methods and systems for dynamic brightness correction. In one embodiment, an electronic circuit configured to perform an image correction method is disclosed, the method comprising: obtaining a pixel value of a color space component from an image; determining whether to perform mid-tone correction for the pixel value of the color space component; calculating, via the electronic circuit, a corrected pixel value based on the determination of whether to perform the mid-tone correction for the pixel value of the color space component; and outputting the corrected pixel value. The color space component may be one of: an Intensity component from a Hue-Saturation-Intensity color space; a Value component from a Hue-Saturation-Value color space; a Lightness component from a Hue-Saturation-Lightness color space; and a Brightness component from a Hue-Saturation-Brightness color space.

Claims20

Dependent claims

A non-transitory computer-readable medium storing processor-executable image correction instructions for:

obtaining a pixel value of a color space component, and a pixel saturation value, from an image;
calculating a corrected pixel value as part of dynamic brightness correction, including a mid-tone correction for the pixel value of the color space component;
wherein the corrected pixel value is calculated as:
I
OUT
=
(
I
S
+
[
(
I
IN
-
I
S
)
γ
I
(
I
E
-
I
S
)
(
γ
I
-
1
)
]
)
-
(
m
S
+
[
(
I
IN
-
m
S
)
γ
M
(
m
E
-
m
S
)
(
γ
M
-
1
)
]
)
,
wherein IOUT is the corrected pixel value, IIN is the pixel value of the color space component, IS is an intensity correction start point, IE is an intensity correction end point, mS is a mid-tone correction start point, mE is a mid-tone correction end point, γI is an intensity gain, and γM is a mid-tone gain;
calculating a corrected pixel saturation value for saturation correction of the pixel saturation value;
wherein the corrected pixel saturation value is calculated as:
S
OUT
=
S
S
+
[
(
S
IN
-
S
S
)
γ
S
(
S
E
-
S
S
)
(
γ
S
-
1
)
]
,
wherein SOUT is the corrected pixel saturation value, SIN is the pixel saturation value, SS is a saturation correction start point, SE is a saturation correction end point, and γS is a saturation gain;
and
outputting the corrected pixel value and the corrected pixel saturation value.

100 more elements

Dependencies are inferred from the claim text.

Method and system for dynamic brightness correction in digital images

Life of this patent

Method and system for dynamic brightness correction in digital images

Life of this patent

Abstract

Claims20