Cylindrical to rectangular correction in image processing
2 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Dear All;
if have an image for cylindrical object ( say pipe). when take the image of the pipe it will project as rectangular image ,which may lead to projection error, how i can compensate for that.\
Best Regards;
0 Commenti
Risposte (1)
Adam Wyatt
il 31 Mar 2015
Modificato: Adam Wyatt
il 31 Mar 2015
Create projected co-ordinates of original image
[Ny, Nx] = size(Img);
x = (1:Nx).';
y = (1:Ny).';
Create original co-ordinates of orignal image (you need to know the transfer function - you probably want to look up Mercator projection
[x1, y1] = MyCoordinateTransferFunction(x, y);
Create new co-ordinates on uniform grid
x2 = linspace(min(x1), max(x1), Nx).';
y2 = linspace(min(y1), max(y1), Ny).';
Interpolate image on new uniform grid
Img2 = interp2(x1.', y1, Img, x2.', y2, 'spline');
Note that I've defined the vectors as columns, so had to transpose the x-coordinates. Also, I've used spline interpolation - you could use linear or nearest if your want better speed but lower accuracy. Check the documentation.
Vedere anche
Categorie
Scopri di più su Read, Write, and Modify Image in Help Center e File Exchange
Prodotti
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!