Study on enhancing dynamic range of CCD image based on digital micro-mirror device

A method based on digital micro-mirror device (DMD) as a SLM modulates an area array CCD is proposed. It is used to solve the information cossing caused by over exposed or under exposed, when shooting high-contrast sences by general CCD camera. A CCD is mapped as multi-districts and is destined for multi-times exposed through a pre-image. A CCD is able to be exposed partly as using a DMD. A data structure is designed for enhancing dynamic range of image from CCD. Experiments show that this method improves the photo quality, and shows information in high lights or shadows clearly. It also enhances the dynamic range of image data. The high quality photo and its high dynamic range data are obtained real-time without the software fuse many different exposure images.