Calibrate camera in Petiole not working – how to fix this?

We get many questions about fixing a problem of camera calibration at Petiole, a mobile application for specific leaf area measurement. That’s why we decided to suggest two general solutions for this issue.

Why I cannot calibrate camera in Petiole mobile application?

There are many reasons for this question. After some research, we have clarified three of them. These aspects tell us why people cannot use Petiole mobile application properly.

Our plant scientists face the problem with camera calibration in Petiole. This may be a result of:

  • An old version of Petiole mobile application or
  • A specific operating system of the smartphone or
  • Problem with the same height and fixed position for measurement.

Solution 1 – Software Updates

Actually, this is one of the most popular solution to the problem of how to calibrate camera in Petiole. You must go to the Petiole mobile application page at Google Play Market and check for any updates.

Honestly, we do our best to fix different problems.

Traditionally, they appear in the mobile application after every new release of OS Android or any its library. That’s why – try to update your mobile application manually if it is not automatic.

Solution 2 – Follow our step-by-step video instruction

We have produced a range of videos about calibration and the next steps of measurements. Hopefully, these materials will be helpful for you:

Step #1. Setup Calibration pad

Step #2. Then, setup Camera with Calibration pad

Step #3. Afterwards, place a leaf on the measuring stand


Step #4. Finally, measure leaf area in square centimetres. Just in one tap!

We hope these solutions will help you. If not – let us know, we will do our best to help you.

We know that there is a range of mobile phones with average productivity. As a result, this creates extra problems. It seems that Petiole does not work properly. We try to fix these problems too.

Please, stay calm. Hopefully, in the next release, we will solve the unique problem that you have.

Anyway, you can always ask an Android phone of your friend. Just to install this app.

Probability is higher that it will work on your friend’s phone.

Good luck with your work and research!

Petiole Plants

Evaluation Methods Of Estimation of Young Apple Trees Leaf Area

The analysis of the three measurement methods of leaf blade area of young bi-axis apple trees on rootstock 54-118 was made. High accuracy of the measurement results by a method of area calculation within a leaf contour on millimeter graph paper (31, 21 ) and with help of a method of computer sight using application “Petiole” on Smartphone with operational system Android (31, 28 ) was established. The gravimetric method and the use of mobile application “Petiole” appeared to be the most productive as to time consumption to carry out the operation.

Key words: leaf blade area, definition methods, computer sight, millimeter graph paper method, gravimetric method, “Petiole” application, bi-axis apple tree.

Authors: O. V. Polunina, Post-graduate Student, Uman National University of Horticulture (Uman), Ukraine
V. P. Maiboroda, PhD in Agricultural Sciences, Associate Professor, Uman National University of Horticulture (Uman), Ukraine
A. Y. Seleznov, Chief Technology Officer at Petiole LTD, Ukraine


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