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image bands in matlab

Started by nourhan_breem April 17, 2007
hello

if anyone can help me in specify image bands using matlab, plzzz replay
as soon as possible

this is my image registration algorithm in which step 8 is related to
image band

1. Apply FFT to images I1 and I2 F1(x, h) and F2(x, h);

2. Compute the absolute values of F1(x, h) and F2(x, h);

3. Apply a high pass filter to the absolute values to remove low
frequency noise;

4. Transform the resulting values from rectangular coordinates to
log-polar coordinates;

5. Apply the FFT to log-polar images I1 and I2 Flp1(x, h) and
Flp2(x, h);

6. Compute the ratio R1 of Flp1(x, h) and Flp2(x, h) using equation
(2);

7. Compute the inverse FFT IR1 of the ratio R1;

8. Find the location of the maximum of abs(IR1) and obtain the
values of scale, and rotation angle ;

maxn = MAX(abs(inv-R), position)

scale = b^(position MOD rows)

angle = 180.0 * (position / rows) / cols

position is : the band position (is a long integer with a value from
zero to number-of-bands minus one) of the image.

how can i specify this position in matlab ??

thanxxxxxx alot