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| 2015-12-17 11:47:59 -0600 | commented answer | How to add gaussian noise in all channels of an image with randn? Yes, this solved it. Thank you. |
| 2015-12-17 11:15:30 -0600 | commented question | How to add gaussian noise in all channels of an image with randn? Currently mean is 0, and sigma somwhere around 0.3... But there is no difference for R and G channels if I set mean to 0 or 255, or if I set sigma to 0.01 or 127 or whatever... |
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| 2015-12-17 10:22:04 -0600 | asked a question | How to add gaussian noise in all channels of an image with randn? I'm not sure if I'm doing something wrong, but I have a strange kind of "misunderstanding" with opencv function (in python) for random number generation - randn() http://docs.opencv.org/2.4/modules/co... When I try to add gaussian noise to RGB image (adding normally distributed random numbers in "dst" matrix that has 3 channels), those random numbers get only distributed through one channel (the first one... blue). Other channels stay unchanged. I am implementing simple peace of code which with shows that I haven't changed anything in gg and rg. Am I doing something wrong? |