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An image sharpening algorithm based on hpf

An image sharpening and image technology, applied in image enhancement, image analysis, image data processing and other directions, can solve problems such as inability to distinguish between object edges and white noise, amplifying noise, etc.

Active Publication Date: 2021-08-20
TIANJIN TIANDY DIGITAL TECH
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Problems solved by technology

Traditional image edge sharpening algorithms (such as the sharpening algorithm implemented by ordinary HPF filters) cannot effectively distinguish object edges from white noise, resulting in amplified noise while improving the sharpening effect

Method used

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  • An image sharpening algorithm based on hpf
  • An image sharpening algorithm based on hpf
  • An image sharpening algorithm based on hpf

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Embodiment Construction

[0030] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0032] A kind of image sharpening algorithm based on HPF, its process is as follows:

[0033] (1) Preprocessing the image

[0034] In the process of image acquisition, image noise will be introduced due to the relationship between device circuit noise and other image processing algorithms. The noise will interfere with the sharpening algorithm during edge extraction. In order to ensure the effect of sharpening, simple preprocessing can be performed first. , such as 2D noise reduction processing (such as median filtering)

[0035] (2) Perform HPF convolution and processing on the image

[0036] HPF (High Pass Filter, high pass filter) is designed as a 5*5 high pass filter S:

[0037] ...

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Abstract

The present invention provides a kind of image sharpening algorithm based on HPF, and its process is as follows: (1) carry out pretreatment to image; (2) carry out HPF convolution and processing to image; (3) determine Conv convolution image parameter TH, G , SHF, MAX. (4) Overlay the images. This algorithm can make full use of image grayscale information to perform adaptive noise removal and edge enhancement on the image after HPF convolution, superimpose the original image and the convolution image, and then obtain the sharpened image, and the calculation of this algorithm The method adopts full integer calculation, which speeds up the calculation speed of the algorithm, and also adapts to some platforms that can only perform integer calculations, improves the versatility of the algorithm, and enables the algorithm to have better portability and faster calculation. speed.

Description

technical field [0001] The invention belongs to the field of image effect processing, in particular to an HPF-based image sharpening algorithm. Background technique [0002] In the technical field of image processing, the operation of image sharpening is used to make the edges or textures in the image look more obvious. Traditional image edge sharpening algorithms (such as the sharpening algorithm implemented by ordinary HPF filters) cannot effectively distinguish object edges from white noise, resulting in amplified noise while improving the sharpening effect. In the process of image sharpening, the suppression of white noise is where a breakthrough is needed. Contents of the invention [0003] In view of this, the present invention aims to propose an image sharpening algorithm based on HPF, which can suppress white noise while highlighting the edge of the object, so as to achieve the purpose of sharpening the image. [0004] In order to achieve the above object, techni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T5/003G06T2207/20024
Inventor 刘琰瞿关明朱健立张龙龙
Owner TIANJIN TIANDY DIGITAL TECH
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