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A method and system for obtaining image sensor noise level curve

A technology for sensor noise and image acquisition, applied in the field of image processing, can solve the problems that the effect is easily affected by segmentation, complex calculation, over-estimation of small noise, etc., and achieves the effect of fast computing speed and less computing resources.

Active Publication Date: 2017-12-26
CHENDU PINGUO TECH CO LTD
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Problems solved by technology

This method has high precision, but the calculation is complicated, and a large set of noise curves is required. The effect is easily affected by segmentation, and the phenomenon of overestimation will appear for small noise.

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  • A method and system for obtaining image sensor noise level curve

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Embodiment Construction

[0034] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0035] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0036] Such as figure 1 , the method for obtaining the image sensor noise level curve provided by the present invention includes:

[0037] Step 1: Perform single-channel grayscale image decomposition on the color image. Use , to represent the grayscale image for each channel. In a specific embodiment, the entire color image is decomposed into a grayscale image according to the R, G, and B values ​​of the image pixels. The specific method is to use the R value of the pixel as the grayscale of the pi...

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Abstract

The invention discloses a method and system for obtaining a noise level curve of an image sensor, relates to the technical field of image processing, and aims to provide a method and system for estimating a noise level curve of an image sensor with simple calculation and high accuracy. Technical gist of the present invention: decompose the color image into a single-channel grayscale image to obtain grayscale images of different color channels; sequentially process the three grayscale images to obtain the sensor noise level curve of each grayscale image: Gray histogram statistics; calculate the credible gray interval scale factor of the histogram; calibrate the credible gray interval; divide the gray image into blocks; get the variance and mean of the credible image block; get the mean and variance of the endpoints; The mean and variance pairs are points on the curve, and the noise level curve of the grayscale image sensor is obtained by using the segmented cubic Hermite interpolation algorithm.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an acquisition method for acquiring a noise level curve of an image sensor. Background technique [0002] In recent years, with the popularization of digital cameras and mobile phones with cameras, human beings have entered the era of photography for all. The image sensors commonly used in cameras, such as CCD (Charge-Coupled Device) and CMOS (Complementary Metal-Oxide-Semiconductor) sensors, will generate a large amount of random noise during operation. This noise is not simple Gaussian white noise AWGN (Additive White Gaussian Noise), but a random noise (Signal Dependent Noise) that depends heavily on signal strength. [0003] Currently, there are two types of methods for estimating sensor noise curves using any single image obtained: noise estimation methods based on smooth image blocks and estimation methods based on Bayesian inference. [0004] Among them, the noi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/44
Inventor 陈帅
Owner CHENDU PINGUO TECH CO LTD
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