DJI MAVIC 2 EA thermal sdk misalignment

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Carl

• 2024年06月21日 05:40

Trying to calibration my IR camera and I found the following results. The first image is the checkerboard corners we found in a .jpg image. The second is the corresponding results in the .raw image using dji_thermal_sdk_v1.4_20220929. It is not a common issue. Can anyone kindly tell me why this happens?

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  DJI Developer Support

  • 2024年06月21日 12:10

  Could you upload the original image to this address for us to analyze? https://pan-sec.djicorp.com/s/ZSq7RE9CeF49GBc password：dji123

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  Carl

  • 2024年06月24日 03:03

  Thanks. I have uploaded the IR image and .raw file. I am using dji_thermal_sdk_v1.4_20220929 for extracting the temperature field.

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  DJI Developer Support

  • 2024年06月24日 09:04

  Thank you for your cooperation. I have reproduced this issue, and we are currently investigating the cause. Please wait for some time.

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  DJI Developer Support

  • 2024年07月02日 12:32

  I apologize for keeping you waiting for so long. The situation shown in the photo is normal. This can happen when there is high-speed movement of the aircraft or camera, causing a discrepancy between the colors corresponding to the infrared sensor data and the original photo.

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  Carl

  • 2024年07月03日 02:40

  Thanks for your feedback. I am not sure I follow your meaning. Does it mean the two photos coming from two sensors? I understand there is a discrepancy between visual and infrared images. And we have observed this phenomenon. But the second image was generated using the infrared image. So I don't think it is caused by high-speed movement. Or can you give me more details about how your SDK works? For now I think the infrared camera records the temperature field, and display it in fig 1, but in fig 1 there is only relative values. By using your sdk, we can get the temperature field. So there shouldn't be a discrepancy here.

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  DJI Developer Support

  • 2024年07月03日 14:06

  You can understand it as two different sensors because temperature data must be obtained by the infrared sensor, while the original photo not only uses the infrared sensor.

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  Carl

  • 2024年07月03日 14:40

  Still hard to understand it. I see this phenomenon might be caused by the two different sensors. But why there are two different sensors? The temperature data is extracted from the original photo. So no matter how many sensors here, the temperature data and photo should use the same group of sensors, does it?

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  DJI Developer Support

  • 2024年07月04日 13:40

  The issue with M2EA on the thermal camera is indeed a design problem, so it cannot be resolved through software.

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  Carl

  • 2024年07月05日 04:14

  Thanks very much for your explanation. We are using it for research purpose. If possible, may I ask what exactly this design problem it is?

  In addition, we are considering an upgradation. Has it been solved in the M3T?

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  DJI Developer Support

  • 2024年07月05日 12:09

  I believe there won't be this issue on M3T. I am verifying this with the engineers, and I will reply here again after receiving confirmation.

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  DJI Developer Support

  • 2024年07月09日 12:10

  Thank you for your patience. We have confirmed with the engineers that the M3T will not encounter this issue. The M3T and M2EA use different infrared lenses.

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  Carl

  • 2024年07月09日 15:21

  Many thanks for feedback. It is very useful.

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  DJI Developer Support

  • 2024年07月10日 07:10

  I am happy to help you.

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