Merge vs Align with respect to components' overall accuracy


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    Ondrej Trhan CR

    Hi Jan,

    Image alignment or image registration is a process in which RealityCapture calculates camera positions, orientations and internal camera states, like camera zooming, for every input image. Once images are registered, you will be able to recognize, how you moved with your camera at the time when you were taking the input images. Before alignment you can change the settings and after alignment you can check the results.

    A component is a group of images which are aligned together. Sometimes you can get more components, for example when your photo collection contains more than one disjoint physical object, object texture is weak, there are not enough images or the change in perspective is too high, overlap among images is small and RealityCapture could not pair the images automatically.

    There are more options how to connect a scene which was split into more components.

    • Run alignment again - RealityCapture will first use special algorithms designed for merging components.
    • Use Merge Components tool - merge already created components. When using this function, no new images are added to the existing components. You can find this tool in the ALIGNMENT tab.
    • Control Points - with control points you can manually create a link between two or among more images. Provided additional links, RealityCapture can estimate transformations among images or components.
    • Ground Control Points - geo-referencing of every component to a common space.
    • Adding More Images - this is one of the faster options.
    It is better to use new alignment in your case (after adding control points). Because the image features are detected, it will be quicker than first alignment. Also, the placed control points help to merge these components quicker/better. Also, it can help, when your datasets are georeferenced.
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