uniform_quantizer.m

%uniform_quantizer.m OCTAVE PROGRAMI ÜZERİNDE ÇALIŞABİLECEK ŞEKİLDE OLUŞTURULMUŞ OCTAVE>matlab VARİ BİR MATEMATİKSEL İŞLEM PROGRAMIDIR FAKAT ÖZGÜR BİR YAZILIMDIR
%BU PROGRAM GÖRÜNTÜ İŞLEME DERSİ İÇİN OLUŞTURULMUŞTUR.

function [] = uniform_quantizer()

x= imread ('lena512.bmp');
[height,width]= size(x);

L=input ('input a new number for new picture which Uniform-Quantization will be applied on:');
L=L-1;
	if (L < 0)
		print('input must be between 1-255')
		return
	elseif (L>256)
		print('input must be between 1-255')
		return
	elseif (L == 0)
		print('input must be between 1-255')
		return
	end
B = 256;

q = B/L;
figure(1);imshow(x) 

	for i = 1:height,
		for j= 1:width,
			y(i,j)=floor_quantize(x(i,j),q);
		end
	end
figure(2);imshow(y)

endfunction

function [new_val] = floor_quantize(EX,q)
	new_val=floor(EX/q)*q+q/2;
endfunction

lena512.bmp must be in same directory; where your octave terminal is working.
you can put any grey-level picture to see how this function working. just change the name of the picture you want to apply uniform quantization or rearrange it from the source code by changing "lena512.bmp" to yours.