The problem is that Hugin does not offer undistorted projection, suitable 
for scanned documents. 
Thy this: 
00. Before all, note down the dimensions in pixels of each partial image.
01. Load all images to Hugin
02. Set the projection to rectilinear 
03. Go to Panorama Editor, Control Points tab
04. Open the same images in both view panels
05. Add two horizontal and two vertical lines. Click near the top left in 
the first panel and near the top right in the 2nd panel. 
06. Now you have the first horizontal line. Correct the numeric values to 
x=0, y=0 and x=0, y=image width.
07. Do the same for the 2nd horizontal line at the bottom and two vertical 
lines. Then repeat the steps for all images.
08. Go to Photos tab, create control points using the Hugin CPFind.
09. Go back to the main window, save the project. This is important is 
something goes wrong, you can always go back (you can use Undo too, but 
saving is safer)
10. Back to the Editor. There are several metods of optimizing the 
geometrics. Try the first one (positions, incremental). If it looks not 
perfectly, undo and try another method. 
11. You can save every method as a panorama, then compare the images. I 
recommend this to compare the images in full screen viewer.
11. Optimizing photometrics is optional, usable only when the images were 
scanned with auto exposition, auto fix, auto contrast etc. 

This way I stitched some maps, but it took a lot of time and work. Easier 
to go to a printing service, they have A0 scanners there. 

On Saturday, August 5, 2017 at 8:00:58 AM UTC+2, wrote:
> Hi, 
> I have downloaded Hugin cause I try to find an equivalent of the Photoshop 
> Automate --> Automerge option to stitch several scanned images together, 
> but when I am doing it with Hugin, the final image is deformed (as it was 
> flatten see the comparison with Photoshop below), I searched a little but I 
> didn't find how to correct that (sorry I am also a beginner). If someone 
> has an idea, suggestion or the answer that would help me a lot thank you! 
> Here are the final images created with Hugin (first one) and Photoshop 
> (second one) to see the point: 
> <>
> <>

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