June 2014
Intermediate to advanced
576 pages
16h 43m
English
book
Image Analysis, Classification and Change Detection in Remote Sensing, 3rd Edition
by Morton J. Canty
Content preview from Image Analysis, Classification and Change Detection in Remote Sensing, 3rd Edition
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214 Image Enhancement and Correction
Listing 5.12 : Image matching by phase correlation.
1 PRO e x5_5
2
3 ; read a JPEG image , cut out two 512 x512 pixel arrays
4 file name = Dialog_Pi ckfile ( Fi lter = ’*. jpg ’ ,/ READ )
5
6 IF filen ame EQ ’’ THEN RETU RN ELSE BEGIN
7 Read_JPeG , filename , image
8 g1 = image [0 ,10:521 ,10:521 ]
9 g2 = image [0 ,0: 511 ,0:51 1]
10
11 ; perf orm Fou rier trans forms
12 f1 = fft (g1 , / double )
13 f2 = fft (g2 , / double )
14
15 ; Dete rmine the offs et
16 g = fft ( f2 * conj ( f1 )/ abs ( f1 * conj ( f1 )) , $
17 / inverse ,/ dou ble )
18 pos = whe re (g EQ max ( g ))
19 PRINT , ’O ffset = ’+ st rtrim ( pos MOD 512) $
20
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