is_light_blue = imbinarize​(rescale(L​_blue));

in color based segmentation i have written above line but error occurred after execution is Undefined function 'rescale' for input arguments of type 'double'.

[jayamala pakhare]

which function can be used for rescale

[Stephen23]

Just do it yourself: scaling values to the range [0,1] is not very hard.

Answer 1

[Walter Roberson]

mat2gray() can be used to rescale. The name would tend to suggest that it takes RGB and makes it into grayscale but really it does not do that: it maps input into the range [0 1].