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Expression

Juan Felipe Monsalvo Salazar

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Hi,
I’m modeling a component from the importation of an image. As you know when you import an image, you obtained a function im1(x,y)=(R+G+B)/3 , so is easy to separate only two material. Using the following expression:
Material1*(im1(x,y)<=0.5)+Material2*( im1(x,y)>0.5)

But when i try to do an analytic function in order to distinguish 4 different materials in the image I’m not able to realize a good expression, because there are element that are between at range, but when I applied the following expression:
Material1*(im1(x,y)>=0.9)+Material2*( 0.7<=im1(x,y)<0.9)+Material3*(0.5<=im1(x,y)<0.7)+Material4(im1<0.5)

That doesn’t work and I can only supposed that the expression (0.5<=im1(x,y)<0.7) is incorrect or not supported by Comsol…So if somebody can help me or teach me at little more about the expression that you can input in Comsol I would be very grateful

2 Replies Last Post 07.07.2012, 15:46 GMT-4

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Posted: 1 decade ago 06.07.2012, 18:20 GMT-4
Either (0.5<=im1(x,y)&im1(x,y)<0.7) or (0.5<=im1(x,y)&&im1(x,y)<0.7) should work
Either (0.5

Juan Felipe Monsalvo Salazar

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Posted: 1 decade ago 07.07.2012, 15:46 GMT-4
Thank a lot
Thank a lot

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