Simple and effective method to quantify the optical performance of camera phones

Dong-Xue Michael Wang; Kevin Johnson

doi:10.1117/12.585966

17 January 2005 Simple and effective method to quantify the optical performance of camera phones

Dong-Xue Michael Wang, Kevin Johnson

Proceedings Volume 5668, Image Quality and System Performance II; (2005) https://doi.org/10.1117/12.585966
Event: Electronic Imaging 2005, 2005, San Jose, California, United States

Abstract

A simple method based on binary line pair patterns to evaluate the image quality of camera phones is proposed in this paper, where four different spatial resolution line pairs are located at four different quadrants respectively. The value of Modulation Transfer Function (MTF) of the camera phones can be tested at four different spatial resolutions for the entire field of view (FOV) simultaneously. In addition, other key parameters of optical imaging quality criteria, such as image distortion, relative illumination can also be characterized in the same time. Moreover, the possible color moiré due to color aliasing from RGB channels can be detected and evaluated using the same test chart. Wavelet transforms on the gray level of test images based on the Haar wavelet and the Meyer wavelet are implemented in this paper. The test image is decomposed into the space Vj, (j=-3,-2,-1). The j=-3 corresponds a lower resolution space. Using the multi-resolution wavelet analysis, the 100lp/mm region can be partially recovered at a low resolution space, for example at the space V-2. The results are shown. Some noisy ripples at the original image are also magnified in a lower resolution space.

Citation Download Citation

Dong-Xue Michael Wang and Kevin Johnson "Simple and effective method to quantify the optical performance of camera phones", Proc. SPIE 5668, Image Quality and System Performance II, (17 January 2005); https://doi.org/10.1117/12.585966

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