CHAIR: automatic image registration based on correlation and Hough transform

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Goncalves, H (Author) FCUP; Goncalves, JA (Author) FCUP; Corte Real, L (Author) FEUP; Teodoro, AC (Author) FCUP

Journal

Title: International Journal of Remote Sensing

Vol. 33 No. 24

Pages: 7936-7968

ISSN: 0143-1161

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 23 Citations

ISI Web of Science

Scopus - 26 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

Other information

Authenticus ID: P-002-FHV

DOI: 10.1080/01431161.2012.701345

Abstract (EN): Automatic image registration is a process related to several application fields: remote sensing, medicine and computer vision, among others. Particularly in the field of remote sensing, the ever-increasing number of available satellite images requires automatic image registration methods, capable of correctly aligning a new image. An automatic image registration method - CHAIR (correlation-and Hough transform-based method of automatic image registration) - is proposed, the key concept of which relies on the 'correlation image' produced in both the horizontal and vertical directions. In particular, the computation of the distance of an identified diagonal brighter strip in the correlation image (through the Hough transform) to an offset (the main diagonal) allows for the determination of translational shifts and consequently control points. The set of obtained control points allows for the correction of several types of distortions. The geometric correction quality achieved by CHAIR was objectively evaluated through measures recently proposed, which allow for a more complete assessment of the obtained results. The CHAIR performance was evaluated on both synthetic and real data, with different spatial resolutions and spectral contents. CHAIR has been shown to be able to correctly align two images with a subpixel accuracy, having a priori a 'gold standard' image covering a considerable part of the image to be registered, and has also been shown to work for images of different sensors and/or different spectral bands, situations where traditional correlation methods often yield low and smooth peaks on the correlation surface. It is also able to account for elevation differences and to some extent for rotation and scale effects. Furthermore, it has been shown to have potential for registering synthetic aperture radar (SAR) with optical images.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 33