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Published on Apr 14, 2016
Although event cameras are totally different from conventional ones, as they use the same optic, a calibration step is required especially to compensate the radial lens distortion. The clear difficult is that event-based cameras only respond to scene changes caused by camera motion itself, moving objects or lighting changes, as a consequence, a special calibration method is required.
Therefore, we first create a calibration pattern consisting of a grid of dots in the GIF image format, and display it on a computer screen while the target is blinking continuously using the image file format's animation support. The blinking target stimulates the event-based camera's pixels frequently enough enabling us to construct a sequence of image-like event frames by accumulating events within a time interval. We then apply the polynomial power series calibration model to the event video stream. The output of this event-based camera calibration process is the camera intrinsic matrix and the lens radial distortion parameters.