HDR image generation method, device and mobile terminal

A technology for generating devices and images, applied in the field of image processing, can solve problems such as poor HDR image effect, and achieve the effect of increasing the generation speed and reducing the amount of calculation.

Active Publication Date: 2020-08-11
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0004] In the above HDR image generation method, the preset weight curve is used to calculate the weight coefficient, which is usually only applicable to some scenes, and in other scenes, the generated HDR image effect is poor

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  • HDR image generation method, device and mobile terminal
  • HDR image generation method, device and mobile terminal
  • HDR image generation method, device and mobile terminal

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Embodiment Construction

[0030] In the existing HDR image generation method, the weighting coefficient is generally calculated according to a preset weighting curve. This method is usually only applicable to certain scenes. When it is applied to other scenes, problems such as halo phenomenon or unnatural overall brightness of the picture are prone to occur, and the generated HDR image effect is poor.

[0031] In view of the above problems, an embodiment of the present invention provides a method for generating an HDR image. In the method, the weight coefficient of each image fusion operation is calculated based on the results of Laplacian pyramid fusion of the first image and the second image. , the weight coefficient of each fusion operation can be adaptively changed according to the difference between the first image and the second image, so it can better adapt to the change of the image scene without halo phenomenon or unnatural overall brightness of the picture etc., so the resulting HDR images ar...

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Abstract

The invention relates to a method and device for generating an HDR (High Dynamic Range) image and a mobile terminal. The method comprises the steps of obtaining N original images with different exposure time; performing (N-1) times of an image fusion operation on the N original images, wherein the m-th image fusion operation selects two images to respectively serve a first image and a second imagefor the following image fusion: calculating a weight coefficient of the m-th image fusion operation based on a Laplacian Pyramid fusion result of the first image and the second image, performing weighted averaging on pixel values of pixels at the same positions in the first image and the second image by using the weight coefficient of the m-th image fusion operation to obtain a result of the m-thimage fusion operation; and outputting a result of the (N-1)th image fusion operation to serves as an HDR image. The effect of the HDR image can be improved by adopting the scheme of the invention.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method, device and mobile terminal for generating an HDR image. Background technique [0002] Due to the limited dynamic range covered by traditional image sensors, most of the collected images are low dynamic range (Low Dynamic Range, LDR) images. In order to meet the image requirements of brightness and detail information, a high dynamic range (High Dynamic Range, HDR) image appears. [0003] Existing HDR images are usually generated by the following method: First, calculate the weight coefficient according to the preset weight curve, and then use the calculated weight coefficient to perform weighted average processing on the pixel values ​​at the same coordinate positions of the original input multi-frame LDR image, Get an HDR image. [0004] In the above method for generating an HDR image, the preset weight curve is used to calculate the weight coefficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T5/50
CPCG06T5/009G06T5/50G06T2207/20208G06T2207/20221
Inventor 蔡进王浩刘千顺王微
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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