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Messages - mfrancia

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General / Re: Holes in point cloud and distortion around trees
« on: October 09, 2023, 07:38:22 PM »
Oh I see, I was hoping that the problem was mine haha
Thank you very much for your help, I've learned a lot! I'll start searching other datasets now, but when I started this project I didn't find any. Hope that there were published more now.

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General / Re: Holes in point cloud and distortion around trees
« on: October 09, 2023, 07:04:59 AM »
I agree that adjusting the overlap and camera angle could be a great solution. However, I'm not the creator of the dataset and I have no control over the image acquisition process, so I'm trying to improve tthe result with just the images that I have.
I've put the photos as attachments in this reply, but the full dataset is on this link of ScienceDirect: https://www.sciencedirect.com/science/article/pii/S2352340922009428

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General / Re: Holes in point cloud and distortion around trees
« on: October 09, 2023, 04:35:07 AM »
The orthomosaic that I'm creating is for training a neural network for object segmentation.
The overlap of the images is 75%.

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General / Holes in point cloud and distortion around trees
« on: October 09, 2023, 01:07:19 AM »
Hi everyone,
I'm currently working on a dataset of UAV images of avocado trees and I want to generate an orthomosaic, but I'm getting some problems when building it. The main problem is that there're holes in the point cloud around the trees, that leads to some distortion in the DEM, Mesh and orthomosaics. I've already tried some solutions such as classify ground points, build the orthomosaic based on a mesh, use a lower quality in the alignment of the images (that generates more points around the trees, but not enough and reduces significantly the orthomosaic quality) and use more quantity of tie points, but none of them has worked as expected.

I believe the problem might be due to the movement of the trees caused by the wind, the complexity of the branches, and the angle of the camera, but I'm not sure how to solve it.

I've put the images of tie points, point cloud, 3d model and orthomosaic in the attachments. Hope it helps to understand the problem.
Thank you in advance!

By the way, the photos that I'm using have this characteristics:

Type of data:   RGB Bird-view images
Unmanned Aerial Vehicle DJI Phantom Pro 4:
Max H-Speed:72 Km/h
Max V-speed:35 km/h
Weight 1.5 Kg
Action radius 500 m
Autonomy 20-30 Min
Radio control Frequency 2.4 GHz

RGB Camera:
Sensor CMOS
Lens: 8.8 mm/24 mm
FOV: 84°
Resolution: 5472 × 3648
Supported formats: JPG, PNG and RAW
Operating Temperature Range: 0° to 40°C

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