Accessing Function Parameters Information

[boulder1998]

Dear all

I am currently working on a Metashape python workflow to analyse what are the best parameters to use for my project. I've noticed that many functions, such as the following, will put out a summary of the parameters used when finished running. I would like to log this information in a log file.

Example:

Code: [Select]

chunk.matchPhotos(keypoint_limit = 40000, tiepoint_limit = 10000, generic_preselection = True, reference_preselection = True)
doc.save()

This will give me following information that I want to log:
MatchPhotos: accuracy = High, preselection = generic, reference, keypoint limit = 40000, keypoint limit per mpx = 1000, tiepoint limit = 10000, apply masks = 0, filter tie points = 1, filter stationary points = 1, guided matching = 0

How do I access/extract this information to eventually get a list of all the parameters used for the individual functions in my python script?

Thank you!

[Alexey Pasumansky]

Hello boulder1998,

Looks like it is similar to the question from another thread:
https://www.agisoft.com/forum/index.php?topic=13650.msg60316#msg60316

You can check, if the corresponding assets exist in the chunk:
chunk.point_cloud, chunk.depth_maps, chunk.dense_cloud, chunk.model, chunk.elevation, chunk.orthomosaic, chunk.tiled_model.
then access it's meta information:
chunk.meta, chunk.point_cloud.meta, chunk.dense_cloud.meta and etc. it contains the information about the processing parameters used and time spent on the corresponding processing stage.

Is that what you would like to get?

[Paulo]

Hi boulder,

you would look at the meta attribute of Metashape.app.document.chunk.tie_points class as in:

Code: [Select]

chunk.tie_points.meta
Out[5]: 2023-06-28 03:37:22 {'Info/LastSavedDateTime': '2023:06:12 13:51:36', 'Info/LastSavedSoftwareVersion': '1.8.5.15520', 'Info/OriginalDateTime': '2023:06:10 19:06:37', 'Info/OriginalSoftwareVersion': '2.0.2.16334', 'MatchPhotos/descriptor_type': 'binary', 'MatchPhotos/descriptor_version': '1.1.0', 'MatchPhotos/downscale': '1', 'MatchPhotos/duration': '2143.105', 'MatchPhotos/filter_stationary_points': 'false', 'MatchPhotos/generic_preselection': 'true', 'MatchPhotos/guided_matching': 'false', 'MatchPhotos/keep_keypoints': 'false', 'MatchPhotos/keypoint_limit': '50000', 'MatchPhotos/keypoint_limit_per_mpx': '1000', 'MatchPhotos/max_workgroup_size': '100', 'MatchPhotos/ram_used': '1681215488', 'MatchPhotos/reference_preselection': 'true', 'MatchPhotos/reference_preselection_mode': '0', 'MatchPhotos/reset_matches': 'false', 'MatchPhotos/subdivide_task': 'true', 'MatchPhotos/tiepoint_limit': '10000', 'MatchPhotos/workitem_size_cameras': '20', 'MatchPhotos/workitem_size_pairs': '80'}
all keys() that begin with 'MatchPhotos/' will give you what you are looking for:

Code: [Select]

chunk.tie_points.meta.keys()
Out[6]: 2023-06-28 03:44:15
2023-06-28 03:44:15 ['Info/LastSavedDateTime',
2023-06-28 03:44:15  'Info/LastSavedSoftwareVersion',
2023-06-28 03:44:15  'Info/OriginalDateTime',
2023-06-28 03:44:15  'Info/OriginalSoftwareVersion',
2023-06-28 03:44:15  'MatchPhotos/descriptor_type',
2023-06-28 03:44:15  'MatchPhotos/descriptor_version',
2023-06-28 03:44:15  'MatchPhotos/downscale',
2023-06-28 03:44:15  'MatchPhotos/duration',
2023-06-28 03:44:15  'MatchPhotos/filter_stationary_points',
2023-06-28 03:44:15  'MatchPhotos/generic_preselection',
2023-06-28 03:44:15  'MatchPhotos/guided_matching',
2023-06-28 03:44:15  'MatchPhotos/keep_keypoints',
2023-06-28 03:44:15  'MatchPhotos/keypoint_limit',
2023-06-28 03:44:15  'MatchPhotos/keypoint_limit_per_mpx',
2023-06-28 03:44:15  'MatchPhotos/max_workgroup_size',
2023-06-28 03:44:15  'MatchPhotos/ram_used',
2023-06-28 03:44:15  'MatchPhotos/reference_preselection',
2023-06-28 03:44:15  'MatchPhotos/reference_preselection_mode',
2023-06-28 03:44:15  'MatchPhotos/reset_matches',
2023-06-28 03:44:15  'MatchPhotos/subdivide_task',
2023-06-28 03:44:15  'MatchPhotos/tiepoint_limit',
2023-06-28 03:44:15  'MatchPhotos/workitem_size_cameras',
2023-06-28 03:44:15  'MatchPhotos/workitem_size_pairs']

[boulder1998]

Hi Alexey and Paolo

Thanks for your responses.

For the suggestion of Alexey: This goes in the right direction.
it is unfortunately not working for me. Maybe I've missed something additionally. Do I have to consider some further specifications/classes/functions that meta works? And would .meta apply for everything that is related to chunks => e.g. chunk.buildDEM.meta, chunk.point_cloud.meta?

Further, my interest lies also in the "translation" of for example downscale = 1, that would give a certain accuracy =high. I want to extract this translation information. So, the functions do this but I cannot extract it into a log file. So maybe for that there is even a better solution?

For the suggestion of Paolo: similar thing... key() gives me errors.

Thanks.

[Paulo]

Hi Alexey and Paolo

For the suggestion of Paolo: similar thing... key() gives me errors.

Thanks.

If you are using version prior to 2 (1.8.or less) then use chunk.point_cloud.meta.keys()

Code: [Select]

ps.app.version
Out[6]: 2023-06-29 12:53:29 '1.8.5'

chunk.point_cloud.meta.keys()
Out[7]: 2023-06-29 12:53:33
2023-06-29 12:53:33 ['Info/LastSavedDateTime',
2023-06-29 12:53:33  'Info/LastSavedSoftwareVersion',
2023-06-29 12:53:33  'Info/OriginalDateTime',
2023-06-29 12:53:33  'Info/OriginalSoftwareVersion',
2023-06-29 12:53:33  'MatchPhotos/descriptor_type',
2023-06-29 12:53:33  'MatchPhotos/descriptor_version',
2023-06-29 12:53:33  'MatchPhotos/downscale',
2023-06-29 12:53:33  'MatchPhotos/duration',
2023-06-29 12:53:33  'MatchPhotos/filter_stationary_points',
2023-06-29 12:53:33  'MatchPhotos/generic_preselection',
2023-06-29 12:53:33  'MatchPhotos/guided_matching',
2023-06-29 12:53:33  'MatchPhotos/keep_keypoints',
2023-06-29 12:53:33  'MatchPhotos/keypoint_limit',
2023-06-29 12:53:33  'MatchPhotos/keypoint_limit_per_mpx',
2023-06-29 12:53:33  'MatchPhotos/max_workgroup_size',
2023-06-29 12:53:33  'MatchPhotos/ram_used',
2023-06-29 12:53:33  'MatchPhotos/reference_preselection',
2023-06-29 12:53:33  'MatchPhotos/reference_preselection_mode',
2023-06-29 12:53:33  'MatchPhotos/reset_matches',
2023-06-29 12:53:33  'MatchPhotos/subdivide_task',
2023-06-29 12:53:33  'MatchPhotos/tiepoint_limit',
2023-06-29 12:53:33  'MatchPhotos/workitem_size_cameras',
2023-06-29 12:53:33  'MatchPhotos/workitem_size_pairs']