How to convert pixel values of an image array to white or black only?-CodePudding

I would like to convert the image below to only black and white (no gray areas).

So, if I have the variable "image_array" (shape 12288x1 double, values ranging from 0 to 1), how can I convert all the values in this array so that they are either 0 or 1 only? The threshold could be if a value is <0.5, then its new value=0. Otherwise, its new value=1.

I was thinking of just doing this: create a for loop to iterate through each value in "image_array" and, with an if statement, to compare the current value against the threshold & assign its new value? Or, is there a simpler way, more efficent way to do this?

CodePudding user response：

If you have the Image Processing and Computer Vision Toolbox, you can simply use imbinarize. It does global thresholding according to Otsu's method or adaptive thresholding.

CodePudding user response：

Let A be the image mentioned in the question:

th1=.5;
A(A>th1)=1;
A(A<=th1)=0;