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Image sharpening algorithm based on HPF (Highest Possible Frequency)

A technology of image sharpening and algorithm, applied in image enhancement, image analysis, image data processing, etc., can solve the problems of magnifying noise, inability to distinguish object edges and white noise, etc., achieve good image sharpening, speed up computing speed, suppress noise effect

Active Publication Date: 2018-03-09
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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  • Image sharpening algorithm based on HPF (Highest Possible Frequency)
  • Image sharpening algorithm based on HPF (Highest Possible Frequency)
  • Image sharpening algorithm based on HPF (Highest Possible Frequency)

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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 invention provides an image sharpening algorithm based on HPF (Highest Possible Frequency). The image sharpening algorithm comprises the following steps: (1) preprocessing images; (2) performing HPF convolution and processing on the images; (3) confirming Conv convolution image parameters TH, G, SHF and MAX; and (4) overlapping the images. By adopting the image sharpening algorithm, images after HPF convolution are subjected to self-adaptive noise filtration and edge enhancement by using image gray information sufficiently, original images and convolution images are overlapped, and furthermore, sharpened images can be acquired; in addition, all integer calculation is adopted as a calculation mode of the algorithm, so that the calculation speed of the algorithm is increased, the methodis applicable to a platform which can only have integer calculation, the universality of the algorithm is improved, and the algorithm has relatively good portability and a relatively rapid calculationspeed.

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 Applications(China)
IPC IPC(8): G06T5/00
CPCG06T2207/20024G06T5/73
Inventor 刘琰瞿关明朱健立张龙龙
Owner TIANJIN TIANDY DIGITAL TECH
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