using integrated webcam of laptop for image processing in matlab

hello i m writing prog for removing salt n pepper noise from digital image, i want to capture image by integrated web cam of my lappy n use directly in matlab program of image processing to remove salt n pepper noise. plz help.

[Trong Nguyen Thanh]

Answer: https://www.mathworks.com/help/supportpkg/usbwebcams/ug/acquire-images-from-webcams.html

Video: https://www.youtube.com/watch?v=Ekl21W7by_k

Answer 1

[Image Analyst]

Do you have the Image Acquisition Toolbox? When you get that, just run imaqtool, click on your webcam in the hardware browser, and do stuff (live preview, etc.) and see what commands it executes. Then just copy and paste those commands into your own m-file.

Salt and pepper noise can be eliminated by taking a median filter, subtracting it from the original (make sure you cast the original image to floating point first), taking the absolute value, thresholding to get a "map" of where the noise is, then use this map as logical indexing to replace the bad/noisy pixels in the original with the median filtered version. It's literally about 3 lines, doing just what I said. Write back if you have trouble with it.

[Kumar Saurabh]

hello yes i have the image acquisation toolbox.i know how to use imaqtool also.but i am not able to understand how to change settings in the hardware browser and do stuff like live preview etc.plz help me.

Answer 2

[Kok Hong]

hi, can i know what do u mean see what commands it executes? where to see it?? thx in advance.

Answer 3

[Bastian]

@ Image Analyst: What to do with the "noise map", it's boolean? Waht do you mean with logical index and how to remove the nosiy pixels? Multiply it with the median filtered one? Thanks