Image processing method and device

An image processing and image technology, applied in image data processing, image enhancement, image analysis, etc., can solve problems such as low image contrast, unclear image details, halo phenomenon, etc., to achieve prominent image details, remove halo phenomenon, Enhance the effect of detail

Active Publication Date: 2017-05-31
ZHEJIANG DAHUA TECH
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Problems solved by technology

[0005] The present invention provides an image processing method and device, which are used to solve the problem of relatively low image contrast, unclear image details and easy occurrence of "halo phenomenon" caused by the way of image detail processing in the prior art. question

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Embodiment Construction

[0081] The image processing method and device provided by the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

[0082] An embodiment of the present invention provides an image processing method, such as figure 1 As shown, the method includes:

[0083] Step 101, using wavelet transform to perform N-order decomposition on the original brightness image of the original image, where N is an integer not less than 1.

[0084] Specifically, wavelet transform can be used to perform N-order decomposition on the original brightness image of the original image. For example, orthogonal wavelet transform or stationary wavelet transform can be used. Preferably, stationary wavelet transform is used to perform N-order decomposition on the original brightness image of the original image.

[0085] Among them, after the N-order decomposition of the original brightness image of the original image by using the stationary wavelet...

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Abstract

The invention provides an image processing method and device. The method comprises the steps that an original brightness image of an original image is decomposed into N orders by wavelet transform; for each decomposed image, the corresponding frequency of each pixel in the decomposed image is adjusted according to a frequency adjustment threshold corresponding to the decomposed image, wherein the frequency higher than the frequency adjustment threshold is adjusted lower, and the frequency lower than the frequency adjustment threshold is adjusted higher; according to each decomposed image obtained after frequency adjustment, an adjusted brightness image corresponding to the original image is reconstructed; according to the original image, the original brightness image and the adjusted brightness image, a processed image corresponding to the original image is determined. The image processing method and device can reproduce image details and enhance details in areas with less prominent details, and can enhance the details of the dark region image of the original image and reproduce the details of the highlighted region image.

Description

technical field [0001] The invention relates to the technical field of digital image processing, in particular to an image processing method and device. Background technique [0002] In the field of image display, usually the display can display the pixel values ​​with brightness values ​​of R, G, and B components between [0, 255], but 256 different brightness levels obviously cannot fully reflect the brightness of light in nature. For example, the brightness of the sun may be thousands of times the brightness of an incandescent lamp, hundreds of thousands of times the brightness of a desktop illuminated by an incandescent lamp, which is far beyond the brightness range that the monitor can display. The displayed image may be overexposed in bright areas and underexposed in dark areas, making it impossible to distinguish image details. Therefore, how to display such a wide brightness range within a limited brightness range is exactly the problem to be solved by image processi...

Claims

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T2207/20024G06T2207/20064G06T5/70
Inventor 杨长久
Owner ZHEJIANG DAHUA TECH
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