Temporal-noise measurements of a CMOS camera used for image quality measurements

Hans Roehrig; William J. Dallas; Gary R. Redford

doi:10.1117/12.773602

18 March 2008 Temporal-noise measurements of a CMOS camera used for image quality measurements

Hans Roehrig, William J. Dallas, Gary R. Redford

Proceedings Volume 6913, Medical Imaging 2008: Physics of Medical Imaging; 69133D (2008) https://doi.org/10.1117/12.773602
Event: Medical Imaging, 2008, San Diego, California, United States

Abstract

We have used a CMOS camera as multi-purpose instrument for measuring image quality of high-resolution LCD displays for use in medical diagnosis. The camera uses a Foveon sensor so that the RGB pixels are co-located making for simplified spatial sampling. In this presentation we examine the temporal-noise characteristics of the CMOS camera. We are using one of several LED's in an integrating sphere as the light source to provide the nominally uniform illumination for each experiment. In first experiments we place the camera sensor near to the opening of the integrating sphere without introducing an imaging lens in order to initially eliminate the characteristics of the lens. The capture parameters for the camera control software are set to give us as nearly raw data as possible. We suppress the native processing because our application is much different than the usual image-reproduction function. We capture sequences of images with the same illumination and same capture parameters and write them to TIFF files. The Matlab-based software we've written first pre-processes the images then calculates the pixel-wise mean and standard deviation over the sequence of frames. The calculation is repeated for each of the three (RGB) channels of the CMOS camera. These statistics are displayed as graytone images in three windows with the maxima and minima displayed in the title-bars. The short-term goal of the experiments is to prepare the way to compare the performance of cooled and un-cooled versions of the camera.

Citation Download Citation

Hans Roehrig, William J. Dallas, and Gary R. Redford "Temporal-noise measurements of a CMOS camera used for image quality measurements", Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69133D (18 March 2008); https://doi.org/10.1117/12.773602

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

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