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Image enhancement method and device

An image enhancement and image technology, applied in the field of image processing, can solve the problems of missed diagnosis, misdiagnosis, and inconvenient diagnosis by doctors, and achieve the effect of enhancing subtle details and edges, reducing the probability of missed diagnosis or misdiagnosis, and improving quality.

Active Publication Date: 2020-03-31
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after using the current enhancement method to process the collected image, the quality of the enhanced image is not high, which does not meet the actual clinical needs, which brings inconvenience to the doctor's diagnosis and may also lead to missed or misdiagnosed situations.

Method used

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Embodiment 1

[0051] Perform S11: Pyramid decomposition of the image is performed through Laplace transform to obtain high-frequency images and low-frequency images of each layer of the image. For example, if the image is decomposed into three layers using the Laplace transform, the image is first decomposed into the low-frequency image of the first layer and the high-frequency image of the first layer, and then the first layer The low-frequency image is decomposed into the low-frequency image of the second layer and the high-frequency image of the second layer, and then the low-frequency image of the second layer is decomposed into the low-frequency image of the third layer and the high-frequency image of the third layer. In this embodiment, the image is decomposed into several layers through the Laplace transform, which can be determined according to the actual size of the image and the actual needs in the processing process. Generally speaking, the Laplace transform is used for the image. ...

Embodiment 2

[0063] In this embodiment, the image is decomposed into L layers (the first layer to the Lth layer) by Laplace transform, and the image is decomposed into L+N layers (the first layer to the Lth layer) by wavelet transform. N layer), similar to that in the first embodiment, and will not be repeated here. The difference between this embodiment and the first embodiment is that when reconstructing the high-frequency image from the first layer to the L-th layer decomposed by the Laplace transform and the low-frequency image from the Lth layer decomposed by the wavelet transform, In order to further enhance the contrast of the reconstructed image, in this embodiment, the high-frequency images from the first layer to the Lth layer obtained by the decomposition of the Laplace transform are respectively enhanced. Specifically, the first layer to the Lth layer can be separately enhanced. The high-frequency image of the L-th layer is linearly enhanced or nonlinearly enhanced. The update ...

Embodiment 3

[0066] In this embodiment, the image is decomposed into L layers (the first layer to the Lth layer) by Laplace transform, and the image is decomposed into L+N layers (the first layer to the Lth layer) by wavelet transform. N layer), the low-frequency image of the L-th layer obtained by the wavelet transform decomposition is used to update the low-frequency image of the L-th layer obtained by the Laplace transform decomposition, and the updated low-frequency image of the Lth layer is used to sequentially compare the L-1 to The corresponding update of the low-frequency image of the first layer is similar to that in the first embodiment, and will not be repeated here. The difference between this embodiment and Embodiment 1 and Embodiment 2 is that in this embodiment, it is considered that when the images of each layer obtained by wavelet transform and Laplace transform decomposition are reconstructed, there will be oscillation artifacts. The quality of the image is affected. There...

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Abstract

The invention provides an image enhancement method and device. The image enhancement method comprises the steps that an image is decomposed into L layers based on first transformation; the image is decomposed into L+N layers based on second transformation, and N>=1; and the Lth layer low-frequency image obtained through decomposition based on second transformation and the first to the Lth layers of high-frequency images obtained through decomposition based on first transformation are reconstructed. According to the technical scheme, the contrast of the image is enhanced to a large extent so that the quality of the image is enhanced.

Description

Technical field [0001] The present invention relates to the field of image processing technology, in particular to an image enhancement method and device. Background technique [0002] Digital X-ray photography (DR, Digital Radiography) equipment is an advanced medical equipment formed by the combination of computer digital image processing technology and X-ray radiation technology. Digital X-ray photography equipment is widely used because of its low radiation dose, high image quality, high disease detection rate and high diagnostic accuracy. [0003] For digital X-ray photography equipment, the contrast of the image directly output by the detector is low, which is not conducive to the doctor to observe the lesion and some subtle details. In order for doctors to diagnose the patient's condition more conveniently and accurately, image enhancement methods are usually used in the image post-processing algorithm of DR equipment to increase the contrast of the image, making the detail...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/40
CPCG06T5/00G06T5/002G06T7/40G06T2207/10116G06T2207/20016G06T2207/20064G06T2207/20192
Inventor 边钺岩周海华江春花闫晶
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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