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Image was not calibrated Properly. What is the reason?


 

Could you share the quality report? It seems that the overlap isn’t sufficient

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I have just finished my Initial Processing… I Couldn’t identify the reason for Uncalibration…  I thought that it may due to vegetation area or Coordinate Zone Changing place… The place(Uncalibrated Strip) was locate between two zones.

Hey Rohini,

Are all those uncalibrated images trees? If so you could try using Alternative calibration, and 0.5 image scale. Alternatively you could add some MTP’s.

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Hey Selim,

I’m a beginner to Pix4D. So please explain briefly about the alternative calibration.

Hey Rohini,

Image scale is under Processing Options/General  tab and the Calibration method is under Calibration tab, make sure the Advanced tab is checked. 

Take a look at the following link:

https://support.pix4d.com/hc/en-us/articles/205327965-Menu-Process-Processing-Options-1-Initial-Processing-Calibration

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Even thought 93% of photos were calibrated pix4d created 7 blocks which is not a good sign. I’m pretty sure that there are more some kind of shifts

You can see those blocks here. Different color means different block.

Hey Selim,

I have used Alternative Calibration & 0.25 Image scale for that single strip. Eventhough there were some images which are uncalibrated. Take a look at the image…

Hey Jaakko,

Would You please explain what kind of shift it is? how to rectify the problem?

The projects I’ve done and had similar results using “All prior” in camera optimization settings have solved the problem. You should try that.

 

The shift is usually some kind of vertical shift between blocks. Something like this:

Hey Jaakko,

I have processed initial step for that uncalibrated single strip using all priors in camera optimization but the problem doesn’t solved.

Could you share the data set? I could take a look at it

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Hey Jaakko,

Here I have attached the uncalibrated dataset… take a look at it.

http://www.fileconvoy.com/dfl.php?id=g1302e8a6b89903cc1000075704d770fb595071b4d0

I’ve checked the images and I’m pretty sure that the overlap isn’t sufficient.

Hey Jaakko,

Is there any other possible ways to calibrate images?

You could try to get them manually calibrated 

https://support.pix4d.com/hc/en-us/articles/202560189-How-to-manually-calibrate-uncalibrated-Cameras-in-the-rayCloud

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I will try about the Manual Calibration and then let u know.

Hey Rohini, 

You have mentioned that you tried 0.25 image scale have you also tried 0.5 image scale?

Hey Jaakko,

Thanks for your Instructions. I will try about the Manual Calibration and let you know.

Hey Selim,

I have also tried 0.5 image scale… still there was an error in an image.