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ROLLINGSHUTTER is a brand new plug-in tool for After Effects and Nuke which tackles image-distortion problems often experienced by users of CMOS cameras. Rolling shutter effects are commonly found with video cameras employing CMOS image sensors, which record every frame line-by-line from top to bottom of the image, rather than as a single snapshot of a point in time. As parts of the image are recorded at different times, fast-moving objects, or objects that pass quickly through frame during camera whip-pans, become distorted with diagonal skews. Other typical distortions include image wobbles created when cameras are hand-held, and exposure problems with flashing or strobing lights. Along with being ungainly and unwanted, these image distortions also increase the difficulty of 3D tracking during VFX post production, as the tracking points themselves can be equally affected or not deliver accurate results. Using Local Motion Estimation technology, we can individually correct parts of the image that are moving relative to the camera, even if they are moving in different directions or at different speeds.
Rolling Shutter, usually found in CMOS sensors is a method of capturing image that does not expose the entire sensor simultaneously, but rather exposes different parts of the sensor in different points in time. Total Shutter act as we intuitively think about shutters. No light is hitting the sensor, then light is hitting the entire sensor array for a brief amount of time (say 1/10th of a second), then the senor is blocked again. The entire sensor captures the same moment in time. Rolling Shutter acts a bit differently. Imagine a slit traveling across the sensor, from top to bottom, exposing each part of the sensor for that same brief amount of time (1/10th of a second). But, since the slit is traveling, the top part of the sensor and the bottom part of the sensor are capturing different moments in time. Now, this is not an actual physical shutter that is moving across the frame, but rather the sensor telling different parts of it to collect light. Here is a short demonstration of how rolling shutter works in a simplified 10x10 CMOS sensor.
You get the most noticeable Rolling Shutter effect when the camera and the object you photograph change in relations to one another with the "roll" of the shutter. In most cameras the shutter rolls for about 1/30 of a second and during that time any movement is hardly noticeable. But you get a distinct Rolling shutter effect when you shoot a fast moving object like an airplane propeller. But this is not the only case, imagine shooting a still image from the window of a fast moving car. Say you are shooting a person. Since the sensor is moving in relation to the subject the same rolling shutter effect will happen. Here is a simplified graphical explanation taken with our 10x10 CMOS sensor. It is a bit exasperated with such a small sensor and a fast moving man, but the idea is the same for every picture you take through a window of a moving vehicle.
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