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How Auto Align in Dermi Atlas matches the same anatomy across the photographs in a comparison so the images line up, and what happens when an image cannot be aligned.
Auto Align lines up the photographs in a split or overlay comparison. It matches the same anatomy across the photographs and moves, scales, and turns each one so it lines up with the alignment reference, so change across visits is read from one frame. The photographs themselves are never modified; the alignment is saved with the comparison and restored when it is reopened.
While the images are being aligned, an "Aligning images" indicator with a Cancel button is shown over the canvas. Closing the comparison or switching between the Split and Overlay tabs also cancels the alignment.
The images then move into place together. Each run is one step in the comparison history, so Undo reverses it, and Reset Transforms returns every image to its original position, clearing manual adjustments as well.
In the split view, each image is moved and scaled within its own section so the same anatomy sits in the same place in every section, in all three layouts. The panes keep moving and zooming together in View mode afterwards.
Illustrative demo with synthetic data. Learn more
In the overlay, the layers are moved so the same anatomy overlaps, and the view returns to fit the canvas. Lowering the opacity of an upper layer then shows the difference between visits directly.
Illustrative demo with synthetic data. Learn more
Photographs taken at different distances, such as an overview and a close-up of the same site, are scaled so the shared anatomy appears at a comparable size.
Illustrative demo with synthetic data. Learn more
Alignment works best when visits are photographed alike:
Alignment moves, scales, and turns the images; it does not correct a difference in camera angle. It accepts up to a four-fold difference in scale and 95 degrees of rotation. Skin with little visible detail, such as a large uniform area, and anatomy hidden or cropped differently between photographs give alignment the least to match and are the causes of the notices below.
The following notices report an alignment that did not complete:
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All demonstrations, screenshots, and media on this page use synthetic data only. No real patient information is shown.
The following are synthetic and do not correspond to real patients:
Media is provided solely to illustrate platform functionality and workflows.