US 2018/0295356 A1Published application

Device for determining residual image of display device and method for determining residual image of display device

AssigneeSamsung Display Co., Ltd.

InventorsHYUNKOO LEE, Sooyoung KIM, Mintak LEE, Kyuseok KIM

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Abstract

A method for determining residual images of a display device includes: dividing an image into a plurality of unit blocks; calculating a chroma, a hue, and a lightness of each unit block; applying a filter to the plurality of unit blocks to calculate a chroma difference, a hue difference, and a lightness difference; calculating a plurality of color difference based on the chroma, hue and lightness differences between the unit block and unit blocks adjacent to the unit block, a chroma weight constant, a hue weight constant, and a lightness weight constant; and calculating residual image indices for each unit block, where a residual image index is a maximum value of the plurality of color differences between the unit block and unit blocks adjacent to the unit block. The lightness weight constant is less than the chroma weight constant and the hue weight constant.

Claims20

Dependent claims

A method for determining residual images of a display device, the method comprising:

capturing an image displayed by a display device;
dividing the image into a plurality of unit blocks;
measuring CIE XYZ chromatic coordinates for each unit block;
transforming the CIE XYZ chromatic coordinates of each unit block into CIE Lab chromatic coordinates;
calculating a chroma, a hue, and a lightness of each unit block from the CIE Lab chromatic coordinates of each unit block;
applying a filter to the plurality of unit blocks to calculate a chroma difference, a hue difference, and a lightness difference, wherein the filter includes a filter center unit block and a plurality of filter adjacent unit blocks adjacent to the filter center unit block;
calculating a plurality of color differences based on the chroma difference, the hue difference, the lightness difference between the unit block and unit blocks adjacent to the unit block, a chroma weight constant, a hue weight constant, and a lightness weight constant;
calculating residual image indices for each unit block, wherein a residual image index is a maximum value of the plurality of color differences between the unit block and unit blocks adjacent to the unit block;
and
storing the residual image indices in a database,
wherein the lightness weight constant is less than the chroma weight constant and the hue weight constant.

8 more elements

A device for determining residual images of a display device comprising:

an imaging portion that captures an image displayed by a display device;
an image dividing portion that divides the image into a plurality of unit blocks;
a chromatic coordinate measuring portion that measures CIE XYZ chromatic coordinates for each unit block;
a chromatic coordinate transforming portion that transforms the CIE XYZ chromatic coordinates into CIE Lab chromatic coordinates and transforms the CIE Lab chromatic coordinates into a chroma, a hue, and a lightness;
a filter portion that calculates a chroma difference, a hue difference, and a lightness difference using the filter, wherein the filter portion includes a filter center unit block and filter adjacent unit blocks adjacent to the filter center unit block;
a color difference calculating portion that calculates a plurality of color differences based on the chroma difference, the hue difference, and the lightness difference between the unit block and unit blocks adjacent to the unit block, using a chroma weight constant, a hue weight constant, and a lightness weight constant;
a residual index calculating portion that calculates residual image indices for each unit block, wherein a residual image index is a maximum value of the plurality of color differences between the unit block and unit blocks adjacent to the unit block;
and
a database that stores the residual image indices,
wherein the lightness weight constant has a value less than a value of the chroma weight constant and a value of the hue weight constant.

7 more elements

A method for determining residual images of a display device, the method comprising:

dividing a digital image into a plurality of unit blocks;
applying a filter to the plurality of unit blocks to calculate a chroma difference between a unit block and unit blocks adjacent to the unit block, a hue difference between a unit block and unit blocks adjacent to the unit block, and a lightness difference between a unit block and unit blocks adjacent to the unit block, wherein the filter includes a filter center unit block and a plurality of filter adjacent unit blocks adjacent to the filter center unit block;
calculating a plurality of color differences based on a following equation:
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wherein ΔL′ denotes the lightness difference, ΔC′ denotes the chroma difference, ΔH′ denotes the hue difference, SL denotes a lightness compensation constant, SC denotes a chroma compensation constant, SH denotes a hue compensation constant, KL denotes a lightness weight constant, KC denotes a chroma weight constant, KH denotes a hue weight constant, and Rt denotes a chroma rotation variable;
and
calculating residual image indices for each unit block, wherein a residual image index is a maximum value of the plurality of color differences between the unit block and unit blocks adjacent to the unit block,
wherein the lightness weight constant is less than the chroma weight constant and the hue weight constant.

81 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/950,419Filed 11 Apr 2018
Priority: KR 10-2017-004677811 Apr 2017
Published: 11 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H04N 17/02
Diagnosis, testing or measuring for television systems or their details: for colour television signals
G09G 3/20
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes: for presentation of an…
G09G 3/3208
Semiconductive, e.g. using light-emitting diodes [LED]: organic, e.g. using organic light-emitting diodes [OLED]
H04N 17/004
Diagnosis, testing or measuring for television systems or their details: for digital television systems