counting of pixels having same same value

how to count pixels having same value

[Adam]

sum( myImage == someValue );

in the absence of any substantive information on what you are counting them in!

[monika SINGH]

i am having a thermal image of human face ,want to count the pixels having same value (x,y).

[Manuel Schmidberger]

Depending on that you wanna count (one or more values) you can use this:

VALS=[1,2...N] % Array of values 1xN
thermIm=       % Matrix of thermal image values
noVals=sum(sum(ismember(thermIm,VALS)))

noVals is the amount of pixels in thermal image containing the values stored in array VALS

If you have just one value you can just use a combination of "length" and "find"

VAL=           % Random number 1x1
noVals=length(find(thermIm==VAL))

[Image Analyst]

Please put Answers down in the Answer section.

Answer 1

[Image Analyst]

You can take a histogram:

histObject = histogram(yourImage);

or

[counts, grayLevels] = imhist(grayImage);

[monika SINGH]

i am having a gray level image,and i want to set some range for pixel intensity like

if x[i,j]=183 to 215 ; (x[i,j]=pixel intensity )

then it would be of red color

else green

c programming of what i amasking is like this

for (i=0;i<n;i++)

{for(j=0;j<n;j++)

{

ifx[i,j]>=183||x[i,j]=215)

{

red color}

else

{green}

end}}

please give me matlab code for this