How to detect target in grayscale image?
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I'm working on image-processing by MATLAB with image-processing toolbox.
What I would like to do is "Detect line mark" on grayscale image, but it is not easy for me.
Because the intensity of each pixel of mark is not stable. For example, the value of a pixel is around 70 and another is near maximum vaule(255).
So, I cannot detect all pixcel just by using threshold. (ex. more than 200)
I already implemented "imadjust" to improve histgram, however, it was not enough.
Could you give me some advice to detect all or almost all of pixels as a part of mark, that is, as white part after an image was conveted to binary image?
Thank you very much for your hep in advance.