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2016-04-22 08:11:01 -0600	asked a question	Apply rotate angle and scale factor to a chessboard image. I got a chessboard image (C:\fakepath\calib13.png. I will project that chessboard image into a plane but I want to apply some scale factor and rotation angle in x and y in order to project the same image seen from different perspectives and heights. How can I make it using OpenCv library? Thank you in advance!
2016-04-18 04:46:15 -0600	commented answer	How can I compare an ideal projection with a real projection? Geometric errors.
2016-04-17 19:10:54 -0600	commented answer	How can I compare an ideal projection with a real projection? I think I finally got it! Thank you so much for your patience! Now, it's time to code :) Besides this, I want to apply some techniques to evaluate the projection errors. I've read papers in order to understand what has been implemented but I can't find something useful, just the usual re-projection error given by OpenCv library. Have you got some knowledge about this?
2016-04-17 10:11:18 -0600	commented answer	How can I compare an ideal projection with a real projection? But do I need to wrap the projected image to the view point of the projector? I don't understand what is the goal to make the projected image with the same size as the original image. If I don't do that, it means that the distortion coefficients won't be calculate properly as well as the reprojection errors?
2016-04-16 11:34:19 -0600	commented answer	How can I compare an ideal projection with a real projection? So, basically I need that the projected image in the flat has the same size as the original image in my computer? That's it?
2016-04-15 14:53:18 -0600	commented answer	How can I compare an ideal projection with a real projection? What's the goal of making the third step in the second approach? I'm not understanding... Sorry for asking so much!
2016-04-15 09:13:20 -0600	commented answer	How can I compare an ideal projection with a real projection? If the projector is projecting square, do I need the third step in the second approach?
2016-04-15 08:16:12 -0600	commented answer	How can I compare an ideal projection with a real projection? Thank you, I got it! :) Besides this, I'd like to apply more techniques to detect projection errors and interpret distortion coefficients and intrinsic parameters, and also understand their influence on projector accuracy. Can you give me some advice? :) Do you have some knowledge on how to do it?
2016-04-15 06:26:34 -0600	commented answer	How can I compare an ideal projection with a real projection? @Tetragramm thank you so much! I think I've understood everything. Just to be sure, the function in the link is findHomography, right? I see a lot of functions there. Also, the images you've posted and the explanations are for the the step 3 in the second approach, right? Thank you so much!
2016-04-13 10:12:05 -0600	received badge	● Supporter (source)
2016-04-13 09:44:43 -0600	commented answer	How can I compare an ideal projection with a real projection? @StevenPuttemans thank's for your answer :) How can I calculate the homography between both? I will get the image captured by the camera, but is it correct to compare it with the image projected by the projector? What do I need to take into account? What distances, and things like that...
2016-04-13 09:35:38 -0600	commented answer	How can I compare an ideal projection with a real projection? @Tetragramm Thank you a lot for your answer, it has clarified much my ideas, although I still have some doubts!
2016-04-13 09:31:34 -0600	commented answer	How can I compare an ideal projection with a real projection? @Tetragramm, can you explain me better in what consist the step 3 in the second approach? I also can't understand the third approach. Can you explain it to me in a deep way? Showing images or something... I'm new in this issues and I really have difficulties understanding this...
2016-04-13 05:30:44 -0600	commented answer	How can I compare an ideal projection with a real projection? I think I'm gonna apply the second choice. That's what I've been thinking about. But my doubts are: 1 - What techniques should I apply to measure the projection errors? 2 - Should I change the pose of the camera to acquire some images of the projected chessboard? 3 - That procedure is the projector calibration?
2016-04-12 14:41:06 -0600	asked a question	How can I compare an ideal projection with a real projection? Hi, I'm trying to evaluate the accuracy of a projector. I mean, I want to compare an image with the ideal projection with an image with the real projection. What procedure should I follow using OpenCv? Have you got some suggestions? Thank you in advance! :)
2016-03-17 13:42:34 -0600	received badge	● Enthusiast
2016-03-12 10:13:23 -0600	asked a question	I got a projector and I want to test its accuracy. How can I do it using OpenCV? In the datasheet it's given that the accuracy is +-2mm at 2m projection distance. I wanna check if the accuracy given on datasheet is valid. My idea is to project some patterns and verify it, but maybe I need some algorithm and something more. Could you please help me? I'm new at OpenCV and also on C++ programming language. Thank you in advance!