Hello aks. First of all, I want to thank you for taking the time to write these very detailed explanations. It's helping me a lot to get started with Hugin. I now get good results, especially after using “Fine-tune all Points”. The next step for me is to succeed in stitching multiple 'mosaic' images. Things are a bit confusing since most of the tutorials about that are 10 years old, and the software has changed since then. I'll keep studying about that, wish me luck ;)
On Thursday, December 17, 2020 at 12:35:45 AM UTC+7 aks wrote: > I also don't get the same numbers as shown in the tutorial, but the > resulting stitch looks fine. > > If you are just starting out with Hugin then this workflow for a run of > the mill stitch might be of use. > > First of all regarding control points there is a Control Points Editor > preference to enable rotation search. Enabling rotation search does not > impact the process as much as it did with older computers. So I start out > enabling it. The default setting disables it. Operate Hugin in Interface > Advanced or Interface Expert mode. > > 1. > > “Fine-tune all Points” after running the “Create control points” > process. This command is found in the Edit pulldown menu. The control > point > distances get normalized in a way to make it easier to notice the > outliers. > The fine-tune process also reports how many control points fall below the > “Correlation Threshold” set in the Control Points Editor preference. > 2. > > View the Control point table. There is a selection on the Edit menu > pulldown. On a Mac, Fn F3 also pulls it up. Sort that table by its > Correlation column by clicking on the column heading to show the smaller > control point correlation numbers at the top. Those smaller correlation > control points are the poorest control points after executing “Fine-tune > all Points". Delete at least those control points that fall below your > correlation threshold. Hugin will graphically show you what each control > point pair is when selecting a point in the table. Depending on what the > photograph image subject is you might also check the best scoring > correlating control points just to confirm there are no point matches that > fooled the point finding process. How the ranked control points distribute > reveals a lot about how well the images align. > 3. > > Now perform the geometric Optimize processes. Proceed down the list of > choices one after the other keeping an eye on the numbers reported. Apply > the changes only when the optimizing numbers are better than the previous > run. Viewing a sorted Control point table again will reveal problematic > control point pairs after the first and possibly subsequent optimization > runs. The numbers in the table will no longer be normalized like before. > Now the table shows “distance” values instead of “correlation” values”. > The > larger distance numbers correspond to the problematic points. These higher > distance points might show numbers much higher than the majority of the > control points. Delete those pairs and continue optimizing processes. The > alignment and warping process is trying to best fit all the control points > as if they all sit on the same curved surface. Removing bad matches or > matches on features not on that common surface, like matches on foreground > objects, helps the overall goal. > 4. > > Perform the photometric optimization. > 5. > > Switch to the “Fast Panorama preview”. (The control button with the > letters GL. Also found in the Window pulldown menu.) Select the > “Projection” tab and change the projection type as needed. > 6. > > Select the “Move/Drag” tab. Press the “Center” button. Press the “Fit” > button. Then hold your breath while selecting the “Straighten” button. > Perform an “Undo” if the Straighten process messed things up. Sometimes > the > Straighten process results in a > Picasso-goes-to-Superman's-Fortress-of-Solitude image. If that happens > then > selecting Hugin's original preview interface, “Panorama preview”, in the > main “Hugin – Panorama Stitcher” window can confirm how the preview really > appears. > 7. > > Select the “Crop” tab. Perform any desired cropping. > 8. > > Return to the main “Hugin – Panorama Stitcher” window and select the > “Stitcher” tab. > 9. > > Press “Calculate optimal size” and then press the “Stitch” located at > the lower right to start the final processes. > > > > On Dec 16, 2020, at 5:28 AM, Laurent E <[email protected]> wrote: > > Hello everyone, > I'm currently doing my 1st steps on Hugin (v2019.2.0 on Mac), and I'm > having a hard time trying to create Control Points. > > For example, I'm trying to reproduce this tutorial about stitching murals ( > http://hugin.sourceforge.net/tutorials/Mosaic-mode/en.shtml). I've > downloaded the 2 images linked (they have the correct EXIF data) but unlike > in the tutorial I'm having bad results after using cpfind to create control > points (the distance between the CPs go from 2035 to 2099). > After using the same Geometric optimization (y,p,r,x,y,z) I get an avg CP > distance of 5.36 with the max being at 10.9 (compared to the person in the > tutorial having a result of 0.13). > > I also tried cpfind with personal images using JPGs straight out of the > camera, and once again I'm having poor results, from 553 to 753). > > I finally did a 3rd test with pictures shot on a calibrated pano head, > results vary from 35 to 965, and the gauge (the coloured block indicating > the average quality of the control-points between the selected photos) > being always in the red. > > I'm not sure what I'm missing but I will gladly accept any help. > > Laurent > > > -- > A list of frequently asked questions is available at: > http://wiki.panotools.org/Hugin_FAQ > --- > You received this message because you are subscribed to the Google Groups > "hugin and other free panoramic software" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/hugin-ptx/adf181d2-8042-49cd-bce9-2e376413f3adn%40googlegroups.com > > <https://groups.google.com/d/msgid/hugin-ptx/adf181d2-8042-49cd-bce9-2e376413f3adn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > > -- A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ --- You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. 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