Question

                                                           

1. Prove that intensity transformation function using the cumulative histogram of input image (L-1) * Integral of upper limit r and lower limit 0 p(r)dr  will have a flat histogram in the transformed image.       

2. Assume that an input image im1 (128x128) is zoomed by a factor of 4 to obtain an out image im2 (512x512). Using the bilinear interpolation, estimate the intensity of im2 at location (row=247, col=153). Given the intensities   im1(61,38) = 18, im1(61, 39) = 26, im1(62, 38) = 22, im1(62, 39) = 30. In     im1 (r,c) the first subscript is row no., and the second is column no.

3. What is contrast stretching? Using python, Write a method “public Image contrastStretching (int noBand)” by intensity transformation:        z1-> z2 = (0->0, 40->30, 140->255)

Answer 1

1. Prove that intensity transformation function using the cumulative histogram of input image (L-1) * Integral of upper limit r and lower limit 0 p(r)dr  will have a flat histogram in the transformed image.       

2. Assume that an input image im1 (128x128) is zoomed by a factor of 4 to obtain an out image im2 (512x512). Using the bilinear interpolation, estimate the intensity of im2 at location (row=247, col=153). Given the intensities   im1(61,38) = 18, im1(61, 39) = 26, im1(62, 38) = 22, im1(62, 39) = 30. In     im1 (r,c) the first subscript is row no., and the second is column no.

1. What is contrast stretching? Using python, Write a method “public Image contrastStretching (int noBand)” by intensity transformation:        z1-> z2 = (0->0, 40->30, 140->255)