Method and system for obtaining noise horizontal curve of image sensor

A sensor noise and image acquisition technology, applied in the field of image processing, can solve problems such as the effect is easily affected by segmentation, complex calculation, small noise overestimation, etc., and achieve the effect of fast computing speed and less computing resources

Active Publication Date: 2015-04-08
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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  • Method and system for obtaining noise horizontal curve of image sensor

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Embodiment Construction

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

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

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

[0037] Step 1: Perform single-channel grayscale image decomposition on the color image. Used to represent the grayscale image of each channel. In a specific embodiment, the entire color image is decomposed 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 gray level of the corresponding pixel in the R color channel graysca...

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Abstract

The invention discloses a method and a system for obtaining a noise horizontal curve of an image sensor, and relates to the technical field of image processing. The invention aims at providing the noise horizontal curve estimation method and system with the advantages that the calculation is simple, and the accuracy degree is high. The method is characterized in that a color image is subjected to single-channel grayscale image decomposition to obtain grayscale images with different color channels; the three grayscale images are sequentially processed to obtain the sensor noise horizontal curve of each grayscale image; the grey level histogram statistics are carried out; the trusted grayscale interval proportion factor of the Trusted gray is calculated; the trusted grayscale interval is calibrated; the grayscale images are blocked; the variance and the mean value of the trusted image block are obtained; the mean value and the variance of an end point are obtained; each mean value and each variance are used as points on the curve, and the noise horizontal curve of the grayscale image sensor is obtained by a segmented three-time 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 an image sensor noise level curve. Background technique [0002] In recent years, with the popularization of digital cameras and mobile phones with cameras, mankind has entered the era of national photography. The image sensors commonly used in cameras, such as CCD (Charge-Coupled Device) and CMOS (Complementary Metal-Oxide-Semiconductor) sensors, generate a lot of random noise during operation. This kind of noise is not simple Gaussian white noise AWGN (Additive White Gaussian Noise), but a kind of random noise (Signal Dependent Noise) that depends heavily on signal strength. [0003] At present, methods for estimating the noise curve of a sensor using any single image obtained include two types: noise estimation methods based on smooth image blocks and estimation methods based on Bayesian inference. [0004] Among them, the noise estimation...

Claims

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Application Information

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