On Selecting Images from An Unaimed Video Stream for Photogrammetric Modelling

P. Rönnholm*, M. T. Vaaja, H. Kauhanen, T. Klockars

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

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Abstract

In this paper, we illustrate how convolutional neural networks and voxel-based processing together with voxel visualizations can be utilized for the selection of unaimed images for a photogrammetric image block. Our research included the detection of an ear from images with a convolutional neural network, computation of image orientations with a structure-from-motion algorithm, visualization of camera locations in a voxel representation to detect the goodness of the imaging geometry, rejection of unnecessary images with an XYZ buffer, the creation of 3D models in two different example cases, and the comparison of resulting 3D models. Two test data sets were taken of an ear with the video recorder of a mobile phone. In the first test case, a special emphasis was taken to ensure good imaging geometry. On the contrary, in the second test case the trajectory was limited to approximately horizontal movement, leading to poor imaging geometry. A convolutional neural network together with an XYZ buffer managed to select a useful set of images for the photogrammetric 3D measuring phase. The voxel representation well illustrated the imaging geometry and has potential for early detection where data is suitable for photogrammetric modelling. The comparison of 3D models revealed that the model from poor imaging geometry was noisy and flattened. The results emphasize the importance of good imaging geometry.

Original languageEnglish
Pages (from-to)389-394
Number of pages6
JournalISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Volume5
Issue number2
DOIs
Publication statusPublished - 3 Aug 2020
MoE publication typeA4 Article in a conference publication
EventISPRS Congress - Technical Commission I - Virtual, Nice, France
Duration: 31 Aug 20202 Sep 2020
Conference number: 24

Keywords

  • convolutional neural network
  • imaging geometry
  • object detection
  • structure-from-motion
  • unaimed video
  • voxel

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