Quantization

imquant(M, n) Returns a quantized version of matrix M containing n equally-spaced grayscale levels between 0 and 255.

imquant2(M, v) Returns a quantized version of matrix M containing the grayscale levels in vector v.

Arguments:

• M is an image matrix.
• n is an integer between 2 and 256.
• v is a vector of real numbers between 0 and 255, in ascending order.