Canvas to bitmap

thanks Dear Paru, i had seen this solutions in the internet, i need to save the canvas in a bitmap variable , and the speed is very important for me, because i'm processing the canvas picture and i want to use it in image processing and machine vision, then if i save the picture in the hard and then call it again i will lose a lot of time!

do you have another solution?

I 'll upload your answer here as well so that it will help the others also.
For any bitmap image

Please look my new post