Screen display method and apparatus, and method and apparatus for generating grayscale mapping information

Patent metadata

Field	Value
Publication number	US-11205369-B2
Application number	US-202017099960-A
Country	US
Kind code	B2
Filing date	Nov 17, 2020
Priority date	Mar 25, 2020
Publication date	Dec 21, 2021
Grant date	Dec 21, 2021

Abstract

A display method for generating grayscale mapping information can be applied to a terminal device, and include: determining an Open Pixel Ratio (OPR) corresponding to an image to be displayed; acquiring a preset corresponding relationship between an original grayscale value and a target grayscale value under the OPR; sequentially converting the original grayscale value corresponding to each pixel of the image to be displayed into the corresponding target grayscale value according to the corresponding relationship; and displaying the image to be displayed according to the target grayscale value corresponding to each pixel obtained by the conversion.

First claim

What is claimed is:

1. A screen display method, applied to a terminal device, the method comprising:
determining an Open Pixel Ratio (OPR) corresponding to an image to be displayed;
acquiring a preset corresponding relationship between an original grayscale value and a target grayscale value under the OPR;
sequentially converting the original grayscale value corresponding to each pixel of the image to be displayed into the corresponding target grayscale value according to the corresponding relationship; and
displaying the image to be displayed according to the target grayscale value corresponding to each pixel obtained by the conversion,
wherein the determining the OPR corresponding to the image to be displayed comprises:
detecting the original grayscale value of each pixel in the image to be displayed;
calculating an average grayscale value of the image to be displayed according to the original grayscale value of each pixel in the image to be displayed; and
determining the OPR corresponding to the image to be displayed according to the average grayscale value of the image to be displayed,
wherein the average grayscale value of the image to be displayed reflects the brightness change of a brightest part and a darkest part of the entire image to be displayed, and is calculated based on a sum of the original grayscale values of all pixels and a number of pixels in the image to be displayed, and the sum is calculated according to the original grayscale value of each pixel in the image to be displayed.

2. The method according to claim 1 , wherein the calculating the average grayscale value of the image to be displayed comprises:
acquiring a color histogram of the image to be displayed by using a color engine in the mobile terminal; and
calculating the average grayscale value of the image to be displayed according to a distribution of the color histogram.

3. The method according to claim 1 , wherein the acquiring the preset corresponding relationship between the original grayscale value and the target grayscale value under the OPR comprises:
acquiring the preset corresponding relationship between the original grayscale value and the target grayscale value when a display screen of the mobile terminal is under the OPR from third-party data information; or
acquiring the preset corresponding relationship between the original grayscale value and the target grayscale value when the display screen of the mobile terminal is under the OPR from a set storage location of the mobile terminal.

4. A method for generating grayscale mapping information for screen display, the method comprising:
determining first grayscale corresponding relationships of a display screen under various Open Pixel Ratios (OPRs), wherein the first grayscale corresponding relationship under the OPR represents a corresponding relationship between each original grayscale value and an original gamma value under the OPR;
converting the first grayscale corresponding relationships under various OPRs into second grayscale corresponding relationships respectively according to a preset corresponding relationship between a target gamma value and each original grayscale value, wherein the second grayscale corresponding relationship under the OPR represents a corresponding relationship between the target gamma value and a target grayscale value under the OPR; and
generating the corresponding relationships between the original grayscale value and the target grayscale value under various OPRs according to the original grayscale values in the first grayscale corresponding relationships and the target grayscale values in the second grayscale corresponding relationships under various OPRs,.
wherein the OPR corresponding to the image to be displayed is determined by following steps:
detecting the original grayscale value of each pixel in the image to be displayed;
calculating an average grayscale value of the image to be displayed according to the original grayscale value of each pixel in the image to be displayed; and
determining the OPR corresponding to the image to be displayed according to the average grayscale value of the image to be displayed,
wherein, the average grayscale value of the image to be displayed reflects the brightness change of a brightest part and a darkest part of the entire image to be displayed, and is calculated based on a sum of the original grayscale values of all pixels and a number of pixels in the image to be displayed, and the sum is calculated according to the original grayscale value of each pixel in the image to be displayed.

5. The method according to claim 4 , wherein the converting the first grayscale corresponding relationships under various OPRs into the second grayscale corresponding relationships comprises:
converting the first grayscale corresponding relationships under various OPRs into the second grayscale corresponding relationships by using a preset conversion manner; and
the preset conversion manner comprises any one of:
a manner using a preset conversion function;
a manner of converting according to a preset lookup table; and
a manner of converting using a preset matrix calculation function.

6. A display apparatus, comprising:
a processor; and
memory for storing instructions executable by the processor;
wherein the processor is configured to:
detect the original grayscale value of each pixel in the image to be displayed;
calculate an average grayscale value of the image to be displayed according to the original grayscale value of each pixel in the image to be displayed;
determine an Open Pixel Ratio (OPR) corresponding to the image to be displayed according to the average grayscale value of the image to be displayed;
acquire a preset corresponding relationship between an original grayscale value and a target grayscale value under the OPR;
sequentially convert the original grayscale value corresponding to each pixel of the image to be displayed into the corresponding target grayscale value according to the corresponding relationship; and
display the image to be displayed according to the target grayscale value corresponding to each pixel obtained by the conversion,
wherein the average grayscale value of the image to be displayed reflects the brightness change of a brightest part and a darkest part of the entire image to be displayed, and is calculated based on a sum of the original grayscale values of all pixels and a number of pixels in the image to be displayed, and the sum is calculated according to the original grayscale value of each pixel in the image to be displayed.

7. The apparatus according to claim 6 , wherein the processor is further configured to:
acquire a color histogram of the image to be displayed by using a color engine in the mobile terminal; and
calculate the average grayscale value of the image to be displayed according to a distribution of the color histogram.

8. The apparatus according to claim 6 , wherein the processor is further configured to:
acquire, from third-party data information, the preset corresponding relationship between the original grayscale value and the target grayscale value when a display screen of the mobile terminal is under the OPR; or
acquire, from a set storage location of the mobile terminal, the preset corresponding relationship between the original grayscale value and the target grayscale value when the display screen of the mobile terminal is under the OPR.

9. An apparatus for generating grayscale mapping information for screen display, comprising:
a processor; and
memory for storing instructions executable by the processor;
wherein the processor is configured to:
determine first grayscale corresponding relationships of a display screen under

Assignees

• Beijing Xiaomi Mobile Software Co Ltd

Inventors

• Yang Kai
• Zhai Dong

Classifications

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G3/2007 Primary

  Display of intermediate tones · CPC title