remove salt and pepper from an image then convert to binary

How can I convert the first image to the second image? I used the code below but it didn't help, and I didn't convert it to binary because it makes it look worse due to the salt and pepper. Also, using medfilt2 making my image blurry.

RGB = imread('center.png');

imshow(RGB);

I=im2gray(RGB);

k=medfilt2(I,[22,22]);

imshow(k)

Answer 1

[Image Analyst]

See my attached demos. You might be able to adapt them.

But you don't have what is called classical salt and pepper noise. I suggest you call adapthisteq then threshold to get blobs brighter and darker than the mean gray level. You also need to fix your horrible lighting situation. Try to avoid the reflection of the overhead light. If you can't arrange the geometry, then use polarizers.