Adding a filter to only white regions of image.

Hello, i have grayscale image and black and white image of the grayscale image. I want to add laplace filter to grayscale image pixels where the pixel's values are 1 in black and white image. How can i do this.

Answer 1

[KALYAN ACHARJYA]

result_image=gray_image.*bw_image;
%Now you can apply the filter on result_image

[voidspecialist]

thank you very much

[voidspecialist]

How can i add filter to only 0 ?

[KALYAN ACHARJYA]

You may apply the filter on whole image, and later discard its effect on those 0 pixels??

[voidspecialist]

Is there any way to select the only zeros and apply a filter to that pixels ?

Answer 2

[Image Analyst]

Looks like you've already accepted an answer so I guess you got it figured out. But here is where I'd refer you:

locallapfilt

Fast local Laplacian filtering of images

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Syntax

B = locallapfilt(I,sigma,alpha)

B = locallapfilt(I,sigma,alpha,beta)

B = locallapfilt(___,Name,Value)

Description

example

B = locallapfilt(I,sigma,alpha) filters the grayscale or RGB image I with an edge-aware, fast local Laplacian filter. sigma characterizes the amplitude of edges in I. alpha controls smoothing of details.

B = locallapfilt(I,sigma,alpha,beta) filters the image using beta to control the dynamic range of A.

example

B = locallapfilt(___,Name,Value) uses name-value pairs to control advanced aspects of the filter.

[voidspecialist]

Thank you very much.