Comparison of objective metrics for image sensor crosstalk characterization

Feng Li; Henrik Eliasson; Alexander Dokoutchaev

doi:10.1117/12.872494

Abstract

Image sensor crosstalk can be divided into spectral crosstalk and pixel crosstalk. This paper focuses on the pixel crosstalk and its effect on signal to noise ratio (SNR). Pixel crosstalk occurs in the spatial domain and is due to the signal leakage between adjacent pixels either by imperfect optical isolation or diffusion of electrons. This will have a negative impact on image quality mainly in two ways: spatial blurring and decreased SNR due to more aggressive color correction required. A method for modeling the spectral broadening due to the pixel crosstalk is used where a matrix is calculated from crosstalk kernels representing the spatial leakage between neighboring pixels. In order to quantify the amount of crosstalk we present a method in which ratios of integrals of the same color channel but within different wavelength intervals are calculated. This provides a metric that is more robust with respect to color channel scaling. To study the impact on SNR due to pixel crosstalk, a number of SNR metrics are compared to results from a limited psychophysical study. The studied SNR metrics are the metric used for calculating the SNR10 value in mobile imaging, the ISO 12232 noise metric and a metric where the signal is transformed into orthogonal color opponent channels, thereby enabling the analysis of the luminance noise separate from the chrominance noises. The results indicate that the ISO total noise and SNR10 metric yield very similar results and that the green channel has the largest individual impact on the crosstalk.

Citation Download Citation

Feng Li, Feng Li, Henrik Eliasson, Henrik Eliasson, Alexander Dokoutchaev, Alexander Dokoutchaev, } "Comparison of objective metrics for image sensor crosstalk characterization", Proc. SPIE 7876, Digital Photography VII, 78760L (24 January 2011); doi: 10.1117/12.872494; https://doi.org/10.1117/12.872494

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $14.40

Non-members: $18.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years