StackOverflow2013

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POGeneric web camera calibration
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copied!<p>I am building a website that does cool things using computer vision techniques, with videos live recorded and uploaded by users using their webcam. For this, I need camera intrinsic and distortion parameters. I am trying to figure out what would be the best way to compute these given the user uploaded videos. We can make no assumptions about what videos user might upload - but a reasonable assumption is that a human might be present in the video. I am still in the initial stages of this, but I am interested in knowing how others have solved this problem.</p> <p>To be specific, below are the questions that I would appreciate someone experienced in the group might comment upon:</p> <ul> <li>What algorithms, libraries and techniques are available to extract intrinsic and distortion parameters of any generic webcam available in the market? [I say "extract" and not "calibrate" to include cases where intrinsic parameters are just a method call away with no calibration necessary].</li> <li>In general, how much variance have you observed in the intrinsic and distortion parameters in the webcams available in the market? Did you approximate them with a single intrinsic and distortion parameters or what approach did you follow?</li> <li>What camera self-calibration methods, if any, could be employed in these scenarios? Are there any opensource or commercial libraries available which might be of some help?</li> <li>If we aim to calibrate the webcams using the videos user record and upload, what assumptions in the parameters [like fx==fy or no distortion params] makes sense and sounds reasonable to you?</li> <li>Would a reasonable approximation of intrinsic and distortion params for all the cameras make sense? What would be a reasonable approach to validate how good particular intrinsic and distortion parameters are for a specific webcam?</li> <li>Are there any other issues that need to be considered?</li> </ul>

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