How to take maximum vector from the image? Can anyone name the function

I am trying to develop following algorithm...

The threshold value based on maximum pixel value

in the image is as follows:

Algorithm:

1.) Take maximum vector from the image.

2.) If max>0.8 then T=max*0.7

3.) Else if max<0.6 %

This means this image tends to be in dark range, so

it is not related T=0.6

4.) Else T=max*0.6

5.) If bw(x,y) is the threshold version of I(x,y)

then,1 if I(x,y)> Tbw(x,y)0 otherwise

[Jan]

What exactly is a "maximum vector of an image"? Does the explanation of the algorithm calrify the question?

This is not clear to me: " If bw(x,y) is the threshold version of I(x,y) then,1 if I(x,y)> Tbw(x,y)0 otherwise"

[Anil K]

This is the point I am not understanding (maximum vector of an image)...remaing is clear..

Answer 1

[Image Analyst]

With g1 = g at time 1, and g2 = g at time 2, try

t=0.1
bw1 = 255 / (1-t) + (1/(1-t)) * double(g1);
t=0.2
bw2 = 255 / (1-t) + (1/(1-t)) * double(g2);
deltaBw1 = bw1 == 1;
deltaBw2 = bw2 == 1;
img = sum(deltaBw1(:) - sum(deltaBw2(:));

I don't think img will be an image since you're summing up all the pixels into a single number. But if you do this for lots of different times, you can put all the img scalars into a vector, like you want.

[Anil K]

Thanks for your asnwer. I have tried but not achieved desired...actual I want...as per following requirement