Method, device and electronic equipment for obtaining spatial frequency response curve

A technology of spatial frequency response and acquisition method, which is applied in the field of image processing, can solve problems such as edge signal fitting interference, edge signal difference, etc., and achieve the effect of suppressing pixel value fluctuations and good edge protection

Active Publication Date: 2020-12-18
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0004] Usually the edge sharpness of the image can be calculated by the spatial frequency response, but because the image itself will cause differences between the edge signal in the final image and the actual edge signal in the process of signal processing such as optical imaging, sampling, interpolation, etc., often in the edge The noise at the signal is likely to cause great interference to the edge signal fitting

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  • Method, device and electronic equipment for obtaining spatial frequency response curve
  • Method, device and electronic equipment for obtaining spatial frequency response curve
  • Method, device and electronic equipment for obtaining spatial frequency response curve

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[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] An embodiment of the present invention provides a schematic flowchart of a method for obtaining a spatial frequency response curve, as shown in figure 1 As shown, the method includes the following steps:

[0047] 101. Obtain a region of interest in an input image;

[0048] The region of interest (Region Of Interest, referred to as RO...

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Abstract

The present invention provides a method, device and electronic equipment for obtaining a spatial frequency response curve. The method for obtaining the spatial frequency response curve includes: obtaining a region of interest in an input image; filtering the region of interest to obtain edge sub-pixels information; obtain an edge spread function according to the edge sub-pixel information; obtain a spatial frequency response curve according to the edge spread function. In the embodiment of the present invention, edge protection filtering is performed on the original edge data of the region of interest before obtaining the edge spread function, so as to better suppress pixel value fluctuations caused by random noise. Compared with other filtering methods, this method has a better edge protection effect, and can reflect the real information of the edge more effectively in the process of edge extraction.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method, device and electronic equipment for acquiring a spatial frequency response curve. Background technique [0002] With the increasing update of mobile phone camera-related technologies, consumers have higher and higher demands on the quality of mobile phone cameras. Modules such as lens, CMOS sensor, and ISP are all key factors that affect the final image quality. The quality of the lens has a great impact on its subsequent processing, such as the strength of the light signal received by the pixel, noise shape, sharpness, etc. The optical system has physical constraints on the imaging process, and the optical transfer function attenuates gradually with the increase of the spatial frequency. Therefore, how to measure the quality of the lens, CMOS sensor and even the entire optical imaging system has become an important topic, among which sharpness is an ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232H04N5/217
CPCH04N23/81H04N23/80
Inventor 蒋彬张玉光朱洪波彭晓峰
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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