I want to create barrel and pincushion distortion effect in MTK phones,and get useful helps from here and here. But i can't understand formulas used in functions of getRadialX、getRadialY and calc_shift although have achieved barrel distortion effect. I hope someone can help me to achieve pincushion effect or explain formulas used in those functions. Thank you!
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Perhaps http://stackoverflow.com/questions/6199636/formulas-for-barrel-pincushion-distortion/6227310#6227310 – Dr. belisarius Nov 07 '11 at 05:55
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Allow me to welcome you to StackOverflow and remind three things we usually do here: 1) As you receive help, try to give it too **answering questions** in your area of expertise 2) [`Read the FAQs`](http://tinyurl.com/2vycnvr) 3) When you see good Q&A, vote them up by [`using the gray triangles`](http://i.imgur.com/kygEP.png), as the credibility of the system is based on the reputation that users gain by sharing their knowledge. ALSO remember to accept the answer that better solves your problem, if any, [`by pressing the checkmark sign`](http://tinyurl.com/4srwe2t) – Dr. belisarius Nov 07 '11 at 05:56
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Thanks for you help, but the answer you mentioned is not a good solution, i still try to solve it. Maybe opencv or gimp can help me, thank you. – SimpleSu Nov 07 '11 at 15:35