Saturation Reduction by the Control of Tiny Digital Reflective Mirrors for Digital Imaging
Date Issued
2010
Date
2010
Author(s)
Ho, Shih-Chieh
Abstract
Digital Camera has become extremely worldwide. No matter what kind of camera been used for photographing or video recording, people may get saturated pictures in bright environment. Sometimes, it is possible to take another picture and try to avoid aiming to a high reflective or luminance object such as mirrors, lamps or Sun. Or we can turn down the camera lens’s aperture a little bit to reduce the exposure. However, the previous moment may be loss already or not retrievable.
A new camera optical system control concept for saturation reduction is proposed in this thesis. This new camera optical system are assembled from Digital Mirror Device(DMD) and Charge Coupled Device(CCD) to be a closed-loop feedback system. DMD component is used to reflect the whole image from lens to CCD sensor, then a controller will identify the image content saturated pixels data in x,y coordinate. Then the corresponding saturated pixels DMD mirrors are driven to off-state. It means that the saturated pixels will be tilted to a bypass state and will not reflect those bright images to CCD sensor anymore. So, the original saturated image will not be reflected to CCD from the next picture. It is a non-saturation picture data that we would like to store into flash memory.
The advantage of this new optical design allows user to take a sharp picture without the concern of getting a saturated picture when aim to a high intensity object.
Subjects
MEMS
CCD
DMD
Type
thesis
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