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Dynamic range mapping method and device

A technology of dynamic range and tone mapping, applied in brightness and chrominance signal processing circuits, image data processing, instruments, etc., can solve problems affecting user experience

Active Publication Date: 2021-11-02
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the maximum brightness of the image is close to the maximum display brightness of the display device, if the above solution is still used, it will cause an abnormal phenomenon that the pixel brightness of the display device after mapping is brighter than the original image, affecting users to experience

Method used

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Embodiment Construction

[0192] The technical solution in this application will be described below with reference to the accompanying drawings.

[0193] First, a brief introduction is given to related concepts and technologies involved in the embodiments of the present application.

[0194] 1. Dynamic range is used in many fields to represent the ratio of the maximum value to the minimum value of a variable. In digital images, dynamic range expresses the ratio between the maximum brightness value and the minimum brightness value within the displayable range of the image. The dynamic range in nature is very large. For example, the brightness of the night scene under the starry sky is about 0.001cd / m 2 , the brightness of the sun itself is as high as 1000,000,000cd / m 2 . Among them, cd / m 2 (candela per square meter) is an SI derived unit for measuring brightness. In this way, the dynamic range in nature reaches 1000,000,000 / 0.001=10 13 order of magnitude.

[0195] However, in real scenes in natu...

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Abstract

The invention provides a dynamic range mapping method and a dynamic range mapping device, which are helpful for avoiding an abnormal phenomenon that the brightness of pixels of terminal equipment after mapping is higher than that of an original image when the maximum display brightness of an image is close to the maximum display brightness of display equipment. The dynamic range mapping method comprises the following steps: acquiring display parameters of the terminal equipment; acquiring feature information of the image data; acquiring a first parameter of a first tone mapping curve of the image data; when a preset condition is satisfied, obtaining a second parameter of a second tone mapping curve according to the first parameter, a display parameter of the terminal equipment and feature information of the image data, wherein the output brightness at a first point on the second tone mapping curve is not higher than the input brightness of the first point on the second tone mapping curve; and performing dynamic range mapping on the image data according to the second parameter of the second tone mapping curve.

Description

technical field [0001] The present application relates to the field of display technology, and more particularly, to a method and device for dynamic range mapping. Background technique [0002] Dynamic range (dynamic range, DR) is used in many fields to represent the ratio of the maximum value to the minimum value of a variable. In a digital image, the dynamic range represents the ratio between the maximum brightness and the minimum brightness within the displayable range of the image, that is, the number of grayscale divisions of the image from "brightest" to "darkest", and its unit is Candela per square meter (cd / m2) can also be expressed as nits. The larger the dynamic range of an image, the richer the brightness level it can represent, and the more realistic the visual effect of the image. Since the dynamic range of natural scenes in the real world is within 10 -3 to 10 6 Between, the dynamic range is very large, so it is called high dynamic range (high dynamic range...

Claims

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Application Information

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IPC IPC(8): H04N9/68H04N9/77G06T5/00
CPCH04N9/77G06T2207/10024G06T5/90G06T2207/20208G09G2320/0626G06T5/92G06V10/60G09G3/3406
Inventor 徐巍炜余全合陈虎王弋川
Owner HUAWEI TECH CO LTD
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