Image alignment settings

 

Alignment ON/OFF toggle: this turn ON or OFF image alignment in the app. If this option is turned ON, you will be asked to choose an alignment method. The default method is: Oriented FAST and Rotated BRIEF (ORB)

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Oriented FAST and Rotated BRIEF (ORB) is a feature matching algorithm. It works by using a small grid to hunt for common visual features between 2 photos, and then tries to align them using these common visual features.

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• Feature matching size slider: You can specify the size of this feature sampling grid. The appropriate grid size depends on the size of the image and how busy are the images.

• Test perspective transform toggle: By default, this option is OFF, by turning OFF this option, it tells the app only to try Translate/Rotate/Scale transforming when aligning images. If this option is ON, the app also tries to perform shear and perspective transform when aligning images.

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Enhanced Correlation Coefficient (ECC) tries to align 2 images by jittering them. This is a very resource intensive method and can be very slow. If ORB method can not align the images, try this. 

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ECC Alignment transform types:

• Translation: tries to align images by shifting images along vertical and horizontal direction

• Euclidean: translation + rotation

• Affine: translation + rotation + scale + shear

• Homography: translation + rotation + scale + shear + perspective.