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Lens shading correction method and device

A technology of lens shading and correction method, which is applied in the direction of TV, solid image signal generator, parts of color TV, etc.

Active Publication Date: 2017-08-18
湖南兴芯微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method is only applicable to the situation where the lens is installed horizontally and the light source is at the center of the image, and cannot perform accurate shadow correction when the lens is not installed horizontally

Method used

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  • Lens shading correction method and device
  • Lens shading correction method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] figure 1 It is a flow chart of the lens shading correction method provided by Embodiment 1 of the present invention. This embodiment is applicable to the situation where lens shading correction is realized adaptively in different lens device states. This method can be implemented by the lens shading correction device provided by the embodiment of the present invention To execute, the device may be implemented in software and / or hardware. The method specifically includes:

[0072] S110. Obtain a white field image by shooting with a camera under the condition of a set light source, and extract pixel grayscale data of the white field image.

[0073] Wherein, the white field image refers to an image whose image content or image background is white. Exemplarily, the white field image may be a picture obtained by shooting white paper or frosted glass through a camera. Specifically, in a closed dark room, by setting The light source is irradiated, the white field image is ac...

Embodiment 2

[0094] figure 2 It is a flow chart of the lens shading correction method provided by Embodiment 2 of the present invention. On the basis of the above embodiment, before determining the pixel point of the maximum grayscale data according to the pixel grayscale data, further adding the pixel grayscale data Smoothing, correspondingly, the method may specifically include:

[0095] S210. Obtain a white field image by shooting with a camera under the condition of a set light source, and extract pixel grayscale data of the white field image.

[0096] S220. Perform smoothing processing on the pixel grayscale data.

[0097] Wherein, in the process of extracting pixel grayscale data, noise will inevitably be generated, and the effect of noise reduction can be achieved by smoothing the pixel grayscale data. Exemplarily, the pixel grayscale data can be smoothed by a smoothing filter deal with.

[0098] Preferably, step S220 can also be:

[0099] Determine the current pixel point one ...

Embodiment 3

[0110] Figure 3A It is a flow chart of the lens shading correction method provided in Embodiment 3 of the present invention. On the basis of the above embodiment, further, before smoothing the pixel grayscale data, the pixel grayscale data is converted into Bayer format data; Determine the current pixel point and the associated pixel point of the current pixel point one by one from each pixel point; merge the pixel grayscale data of the Bayer format data of the current pixel point and the associated pixel point as the pixel grayscale data of the current pixel point, And delete the associated pixels. Correspondingly, the method may specifically include:

[0111] S310. Obtain a white field image by shooting with a camera under the condition of setting a light source, and extract pixel grayscale data of the white field image.

[0112] S320. Convert the pixel grayscale data into Bayer format data.

[0113] Bayer format data is a data arrangement format of specific three-channe...

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Abstract

The embodiment of the invention discloses a lens shading correction method and device. The method comprises the following steps: enabling a camera to shoot under a set light source to capture a white field image, and extracting pixel grayscale data of the white field image; determining a pixel point with the maximum grayscale data according to the pixel grayscale data; and determining correction coefficients of each pixel point according to the pixel grayscale data of each pixel point and the maximum grayscale data, and correspondingly recording the correction coefficients and the situation of the set light source, wherein the correction coefficients are used for performing correction when the camera shoots images under the set light source. By adopting the lens shading correction method and device disclosed by the embodiment of the invention, the problem that image correction cannot be accurately performed when a lens is not horizontally mounted in the prior art can be solved, and the image correction can be adaptively performed in various mounting states of the lens.

Description

technical field [0001] Embodiments of the present invention relate to digital imaging calibration technology, in particular to a method and device for correcting lens shading. Background technique [0002] At present, image sensors are widely used in various fields, such as robots, machine vision, drones or VR (Virtual Reality, virtual reality) products, and many image sensors integrate image processing and other modules on chip circuits. [0003] CMOS (Complementary Metal Oxide Semiconductor, Complementary Metal Oxide Semiconductor) is a commonly used civilian image sensor, the main principle is to receive light to form a pixel array. Lens shading is one of the important factors that affect high-quality images. Lens shading is due to the combination of lens and image sensor parameters, resulting in lens vignetting and pixel vignetting. The combination will produce flat long amplitude or low frequency Changes, etc., lead to the limitation of the amount of incoming light, an...

Claims

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Application Information

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IPC IPC(8): H04N5/217H04N5/357H04N9/04H04N9/64H04N9/73
CPCH04N9/646H04N23/81H04N25/61H04N23/10H04N23/88
Inventor 江巍
Owner 湖南兴芯微电子科技有限公司
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