Image enhancement method and device

An image enhancement and image technology, which is applied in the field of image processing, can solve problems such as missed diagnosis, low image quality, and inconvenient diagnosis for doctors, and achieve the effects of reducing the probability of missed diagnosis or misdiagnosis, enhancing fine details and edges, and improving quality

Active Publication Date: 2016-11-16
SHANGHAI UNITED IMAGING HEALTHCARE
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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] Execute S11: Decompose the image into a pyramid through Laplace transform to obtain high-frequency images and low-frequency images of each layer of the image. For example, if the image is to be decomposed into three layers using Laplace transform, the image is firstly decomposed into the low-frequency image of the first layer and the high-frequency image of the first layer, and then the 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 to process the image. When the pyr...

Embodiment 2

[0063] In this embodiment, the image is decomposed into L layers (first layer to L layer) by Laplace transform, and the image is decomposed into L+N layers (first layer to L+th layer) by wavelet transform. N layers), similar to that in Embodiment 1, and will not be repeated here. The difference between this embodiment and Embodiment 1 is that when reconstructing the high-frequency images from the first layer to the L-th layer obtained by Laplace transform decomposition and the L-th layer low-frequency image obtained by wavelet transform decomposition, 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 decomposing the Laplace transform are respectively enhanced. Specifically, the first layer to the Lth layer can be respectively enhanced. The high-frequency images of the L layer are enhanced linearly or nonlinearly. The update of the L-th layer low-frequency image o...

Embodiment 3

[0066] In this embodiment, the image is decomposed into L layers (first layer to L layer) by Laplace transform, and the image is decomposed into L+N layers (first layer to L+th layer) by wavelet transform. N layer), update the low-frequency image of the L-th layer obtained by Laplace transform decomposition with the low-frequency image of the L-th layer decomposed by the wavelet transform, and use the updated low-frequency image of the L-th layer to sequentially update the L-1th layer to the L-th layer. The corresponding updating of the low-frequency images of the first layer is similar to that in Embodiment 1, 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 there will be oscillation artifacts when reconstructing images of various layers obtained by wavelet transform and Laplace transform decomposition. The quality of the image is affected. Therefore, in this embodiment, t...

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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 invention relates to the technical field of image processing, in particular to an image enhancement method and device. Background technique [0002] Digital Radiography (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 imaging equipment is widely used because of its low radiation dose, high image quality, high disease detection rate and diagnostic accuracy. [0003] For digital X-ray imaging equipment, the contrast of the image directly output by the detector is low, which is not conducive to doctors' observation of lesions and some subtle details. In order to enable doctors to diagnose patients' conditions more conveniently and accurately, the image post-processing algorithm of DR equipment usually uses image enhancement methods to increase the contrast of the image, making the details of the image more promin...

Claims

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Application Information

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Patent Type & Authority Applications(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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