Title :
Color enhancement of low exposure images using histogram specification and its application to multiple color filter aperture camera
Author :
Lee, Eunsung ; Kang, Wonseok ; Kim, Sangjin ; Paik, Joonki
Author_Institution :
Image Process. & Intell. Syst. Lab., Chung-Ang Univ., Seoul, South Korea
Abstract :
This paper presents color enhancement of low exposure images using histogram specification and its application to the p re-processing of a multiple color-filter aperture (MCA) camera which can estimate depth information of objects at different distances and perform multifocusing. Insufficient amount of exposure is the fundamental problem of the M CA camera because of the fixed and finite-sized apertures. The image acquired by the MCA camera cannot avoid the low-exposure and low-contrast degradation. The proposed color enhancement algorithm analyzes the low exposure phenomenon of a particular aperture, and improves the contrast and performance of the registration process in the MCA camera system. The proposed method can enhance the contrast of any low-exposure color images acquired by a conventional camera, and it can also be used to improve the image registration performance of the MCA camera. As a result, it can be incorporated into multifocusing, extended depth of field (EDoF) systems, and real-time 3D reconstruction.
Keywords :
cameras; image colour analysis; image enhancement; image resolution; EDoF systems; MCA camera system; extended depth of field system; finite-sized apertures; histogram specification; image registration; low exposure image color enhancement; low-contrast degradation; multiple color filter aperture camera; real-time 3D reconstruction; Conferences; Consumer electronics;
Conference_Titel :
Consumer Electronics (ICCE), 2011 IEEE International Conference on
Conference_Location :
Las Vegas, NV
Print_ISBN :
978-1-4244-8711-0
DOI :
10.1109/ICCE.2011.5722537