CODEWITHSUNDEEP
matlabimage-processing
user7401447
user7401447

Reputation: 35

MATLAB Error: Input image may not contain NaNs

I am making a traffic sign detection and recognition program in MATLAB for my semester project. By now I have been successful in doing every step correct.

Image >> Normalized Image >> Scaling & Intensifying Image >> Thresholding >> Morphological Operations

I have normalized the image by using this formula:
NORM_COLOR = COLOR/sqrt(RED^2 + GREEN^2 + BLUE^2);

I have scaled my image by the factor of sqrt(3) and intensified by element-wise multiplication to the normalized image.

In thresholing, I have zeroed all three channels (RGB) where this condition is true:

RED < 0.34 OR GREEN > 0.2621

This all gives me an image where all colors (excluding red) are blacked. This is the image I get: Image

Now, when I do morphological operations like imerode it gives me this error:

Error using morphmex
Input image may not contain NaNs.

Error in morphop (line 69)
B = morphmex(mex_method, B, double(getnhood(se(k))), getheight(se(k)), unpacked_M);

Error in imerode (line 123)
B = morphop(A,se,'erode',mfilename,varargin{:});

Error in anas (line 64)
img_seg = imerode(img,se);

This is the code I have written for erosion:

se = strel('disk', 2);
img_seg = imerode(img,se);
imshow(img_seg);

Any one could help me with this problem? Thankyou :)

Upvotes: 2

Views: 74

Answers (1)

Ander Biguri
Ander Biguri

Reputation: 35525

Try avoiding division by zero:

NORM_COLOR = COLOR/sqrt(RED^2 + GREEN^2 + BLUE^2+0.0000001);

Upvotes: 1

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