This function simulates the shift-variant defocus blur due to the limited depth of field of a digital camera. It works my mapping a source irrandiance (image) to a given depthmap and generates an image sequence at different focus positions using a gaussian PSF derived from geometrical optics. For a detailed description of its working principles, refer to appendix B in . This defocus model has been used in  and . For a demo, simply run 'blurdemo' at the matlab prompt.
 S. Pertuz, Modeling and applications of the focus cue in conventional digital cameras. PhD thesis. Universitat Rovira i Virgili, 2013.
 S. Pertuz, D. Puig, M. A. Garcia, Analysis of focus measure operators for shape-from-focus, Pattern Recognition, 46(5): 1415-1432, 2013.
 S. Pertuz, D. Puig, M. A. Garcia, Reliability measure for shape-from-focus, Image and Vision Computing, Volume 31(10):725–734, 2013
Said Pertuz (2020). Defocus simulation (https://www.mathworks.com/matlabcentral/fileexchange/55095-defocus-simulation), MATLAB Central File Exchange. Retrieved .
Noted that the shape 'sphere' should have its absolute value take before displaying.
Thanks a lot!!
Your code was excellent...!
I have a question:
*) I already have a defocused image, I want to make it clear. May I know, if I can use your code to remove defocus problem?
Thanking you in anticipation.
I want to ask you some questions about simulation of PSF. Could I know your email? My email is email@example.com
- Display figure has been updated
Inspired: Shape from focus