Grayscale to Matrix conversion

Question

Fabio 2011-10-20

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回答： Dakshayani Virodhi 2020-11-23

Hi everybody,

is there a way to convert a grayscale map to a matrix? i'm able to realize the opposite operation but i've no idea on how to do this.

Thanks

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Image Analyst 2011-10-20

What do you mean by "map"? Do you mean image, or do you mean lieterally a map, like a photo of a road map or something? What are you starting with? A grayscale image? Well that is already a matrix so there's nothing to do.

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Answer 1

Walter Roberson 2011-10-20

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You can convert it to a grayscale truecolor matrix by using

RGB = cat(3,Grey,Grey,Grey);

If you are hoping to go from a grayscale matrix to a full-color matrix, then you cannot do that without additional information. A particular grayscale value is a projection from a whole ellipsoid of RGB color combinations.

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Answer 2

Fabio 2011-10-21

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Thank for the answer but i probably didn't explain my problem. I just wanted to get a matrix of data from the image. I solved the problem with the 'getimage' function. Now i have one other problem.. in my figure i've several axes and i want to select just some of them according to their title. i can get axes handles with

findobj(figureHandles,'type','axes');

or

findobj(figureHandles,'children');

but this way i get all the handles. I just want some of them (those with the right title). Is there a way?