Im currently using sitk and using conversions to numpy, I am able to perform few operations. I want to know the metrics that are available to compare two image. Is there any direct metric to find correlation between two images?
If you want to compare two images there are multiple similarity metrics that are part of the registration framework, including correlation which assumes a linear relationship (mathematically this is affine but most people refer to it as linear).
Please see the registration overview and the set of registration notebooks in our notebook repository (6* series). The
ImageRegistrationMethod.MetricEvaluate function allows you to compare two images. Please also see this related discussion.