SPEAKER: Sheetal B. Gupta (EE13S063)
GUIDE: A.N. Rajagopalan
The CCD cameras which typically use global shutter are being replaced by CMOS sensors which employ rolling shutter (RS) in which the sensors are exposed row-wise with a single read-out circuit for reduced power consumption. Interestingly, a similar acquisition mechanism is used by the Scanning Electron Microscope (SEM) too in the form of a raster scan mechanism with a well-focused electron beam. Because the magnification in SEM is of the order 10,000x, even small vibrations can cause severe distortions within a frame. Deriving a clean SEM image is very challenging in the presence of these intra-frame distortions and signal-dependent shot noise. We first present a scheme for aligning and fusing these distorted frames by stabilizing the variance of noise and estimating local drifts using block-wise edge features.
The latter part of our work investigates the problem of High Dynamic Range (HDR) imaging in RS cameras. Our framework accounts for RS motion in the irradiance domain by picking the correct warp for each row within a predefined search space. The RS effect is rectified and a clean frame is propagated from one exposure to another to obtain a rectified irradiance map.
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