Authors:
Stéfan van der Walt
and
Ben Herbst
Affiliation:
University of Stellenbosch, South Africa
Keyword(s):
Geometry, interpolation, registration, image-processing, astronomy, log-polar transform.
Related
Ontology
Subjects/Areas/Topics:
Computational Geometry
;
Computer Vision, Visualization and Computer Graphics
;
Feature Extraction
;
Features Extraction
;
Image and Video Analysis
;
Image Filtering
;
Image Formation and Preprocessing
;
Image Formation, Acquisition Devices and Sensors
;
Image Quality
;
Image Registration
;
Informatics in Control, Automation and Robotics
;
Multimodal and Multi-Sensor Models of Image Formation
;
Signal Processing, Sensors, Systems Modeling and Control
Abstract:
A polygon-based interpolation algorithm is presented for use in stacking RAW CCD images. The algorithm improves on linear interpolation in this scenario by closely describing the underlying geometry. 25 frames are stacked in a comparison. When stacking images, it is required that these images are accurately aligned. We present a novel implementation of the log-polar transform that overcomes its prohibitively expensive computation, resulting in fast, robust image registration. This is demonstrated by registering and stacking CCD frames of stars taken by a telescope.