buildDepthMaps fails with Assertion 239101010894

[wdimmit]

I have an drone flight of 218 images that I can align and build a dense cloud without issues using an interactive Metashape session. When I try to process this same set of images via a python script, buildDepthMaps fails with the following message: "Assertion 239101010894 failed. Image size mismatch: 19009f89-7f2e-42a4-90fa-f9cb8c57855b".

The alignment and depth map generation settings are as identical as I can make them between the interactive and automated processing runs.  I've attached the output of the python script starting at the buildDepthMaps step.  The full call to the method is:

            self.ms_chunk.buildDepthMaps(downscale=16,
                                         filter_mode=dict(Metashape.FilterMode.values)['AggressiveFiltering'],
                                         progress=progress_callback
                                         )

I'm using Metashape 1.8.4 in both cases.

Thanks!

[Alexey Pasumansky]

Hello wdimmit,

Usually such assertions arise when one of the source images has been replaced by the image of different dimensions or when the calibration is not properly defined, for example, if you are assigning the calibration via Python, make sure that calibration.width and calibration.height are properly assigned according to the target sensor dimensions.

[wdimmit]

In this script, the sensor dimensions are applied based on the information on the first image:

        camera = self.ms_chunk.cameras[0]   
        self.ms_chunk.addSensor()
        sensor = self.ms_chunk.sensors[0]
        sensor.width = camera.image().width
        sensor.height = camera.image().height
        sensor.type = Metashape.Sensor.Type.Frame

When I open the project after the depth map generation failure, I can see the single sensor type defined properly and all the images listed have the correct dimensions.

[Alexey Pasumansky]

Hello wdimmit,

Can you check, if using camera.photo.image() instead of camera.image() in your case does change anything in the script behavior?

[wdimmit]

No change using camera.photo.image() instead of camera.image(). The information reported in an interactive session after opening the failed project run all appears normal, and as expected.  I've attached a screenshot

[Alexey Pasumansky]

Hello wdimmit,

Maybe you can send to support@agisoft.com chunk.zip and frame.zip archives from the project.files folder structure related to the project created by the Python script (without any modification applied through Metashape GUI)?

Also please provide the code lines that you are using for setting up (or import) of the preclibrated distortion parameters.

[Alexey Pasumansky]

Hello wdimmit,

It appears that the width/height in the calibration file that you are using are flipped compared to the sensor dimensions in Metashape project:

sensor.width = 11664
sensor.height= 8750

calibration.width = 8750
calibration.width = 11664

And this causes the exception during the processing.