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Device and method for high dynamic range image display

A high dynamic range, image display technology, applied in the field of image processing, can solve problems such as poor LDR image display effect, achieve the effect of good display effect and simple operation method

Active Publication Date: 2013-04-03
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a high dynamic range image display method and device, aiming to solve the problem of poor display effect of LDR images due to the use of existing technologies to compress HDR images into LDR images

Method used

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  • Device and method for high dynamic range image display

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Embodiment 1

[0025] figure 1 The implementation flow of the high dynamic range image display method provided by the first embodiment of the present invention is shown, and the details are as follows:

[0026] In step S101, the high dynamic range image is segmented according to a preset image segmentation algorithm to obtain multiple image sub-blocks.

[0027] In the specific implementation process, in order to pursue better local display effect and better performance of the algorithm, the embodiment of the present invention mainly solves the problem of high dynamic range image mapping effect from these two aspects, and adopts the local mapping method of region segmentation , to solve local high / low brightness, dizziness and other problems in the image, and adjusting local parameters during the operation will not affect the display effect of other areas. Specifically, the existing image segmentation algorithm based on graph theory can be used. The image segmentation algorithm based on grap...

Embodiment 2

[0036] figure 2 The implementation flow of the high dynamic range image display method provided by the second embodiment of the present invention is shown, and the details are as follows:

[0037] In step S201, the high dynamic range image is compressed to obtain a low dynamic range image that can be displayed by a display device.

[0038] In step S202, the low dynamic range image is segmented according to a preset image segmentation algorithm to obtain multiple image sub-blocks.

[0039]In the specific implementation process, for high-pixel high dynamic range images or HDR images, direct processing is time-consuming. In order to reduce processing time, it can be down-sampled first to obtain lower-pixel or low dynamic range images. Relevant processing will be carried out later. For example, to map the HDR image to the LDR image first, you can use a global mapping method, such as a linear mapping method or an S-curve global mapping method, to compress the HDR image data to t...

Embodiment 3

[0059] Figure 4 The structure of the high dynamic range image display device provided by the third embodiment of the present invention is shown, and for the convenience of description, only the parts related to the embodiment of the present invention are shown.

[0060] The high dynamic range image display device includes a processor 41 and a display 42, wherein:

[0061] The processor 41 is configured to segment the high dynamic range image according to a preset image segmentation algorithm to obtain a plurality of image sub-blocks, and according to the attribute information of each image sub-block in the plurality of image sub-blocks, each The brightness value of any pixel in the image sub-block at the corresponding position of the high dynamic range image and the preset image linear mapping relationship, adjust the brightness value of the any pixel in the each image sub-block, according to the adjusted The luminance value of each pixel in each image sub-block, generate an...

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Abstract

The invention is applicable to the technical field of image processing and provides a device and a method for high dynamic range image display. The method includes: segmenting a high dynamic range image according to preset image segmentation algorithm to acquire a plurality of image subblocks; adjusting the brightness value of any pixel point in each image subblock according to attribute information of each image subblock, the brightness value of the pixel point at the corresponding position of each image subblock and the preset image linear mapping relation; and generating and displaying a low dynamic range image according to the adjusted brightness value of each pixel point in each image subblock. Displaying effects of the generated low dynamic range image are greatly improved by adjusting the brightness value of any pixel point in each image subblock according to attribute information of each image subblock, the brightness value of the pixel point at the corresponding position of the high dynamic range image and the preset image linear mapping relation.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a high dynamic range image display method and device. Background technique [0002] With the continuous development of CMOS technology, most of the cameras and network cameras in mobile phones have built-in ISP (Image Signal Processing, Image Signal Processing) CMOS sensor single-chip module, all autofocus, autoexposure, autowhite balance And basic image processing algorithms such as backlight compensation are embedded in the ISP. As we all know, the image of the analog signal output by the image sensor after analog-to-digital conversion A / D is an HDR (High Dynamic Range, high dynamic range) image of more than 10 bits, but the existing display devices, such as PC monitors, digital TV monitors 1. The display screen of the mobile phone can only display the image dynamic range of 8bits LDR (Low Dynamic Range, low dynamic range) image, so the image information w...

Claims

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Application Information

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IPC IPC(8): H04N5/351H04N5/355
Inventor 毛旦生李海峰黄文标陈海郑成林
Owner HUAWEI TECH CO LTD
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