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modifying pixel value

asked 2013-04-26 17:08:42 -0500

hayden gravatar image

Hello every body, after loading picture, i would like to modify the pixel values and write it back i.e. the modified image. Could any one give me some hint how can that be done. Thanks.

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answered 2013-04-26 22:04:57 -0500

wuling gravatar image

updated 2013-04-27 01:47:15 -0500

Hi,I use Mat format. If you have a gray picture & change a pixel. like:<uchar>(i,j)=valve// where i is image row & j is image cols & 0<=value<=255

if you want to change all picture value:

for(int y = 0; y < image.row; y++)
    for(int x = 0 < image.col; x++)
         //where operator is image processing algorithm

& please ref Mat::isContinuous and other Mat operator :

If you want lower cost time. I think you should ref opencv code:SSE & AVX or CUDA

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how can i modify pixel value from 0 to 0.01 ?

Deepak Kumar gravatar imageDeepak Kumar ( 2014-11-14 05:48:03 -0500 )edit

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Asked: 2013-04-26 17:08:42 -0500

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Last updated: Apr 27 '13