This paper describes a procedure useful for registering images generated by second generation FLIR sensors with images produced by existing low resolution sensors. The method is particularly applicable to the problem of aligning the seeker of a precision guided munition, such as a missile, to a narrow field of view targeting FUR. A robust image processing technique for measuring the residual registration error from sensors with dissimilar resolutions was developed and tested. The specific development presented in this paper concerns the alignment of an image generated by a second generation targeting FLIR with a field of view of 2 x 2.75 degrees sampled by a pixel matrix of 480 x 640 elements to another sensor's image with a field of view of 1.5 x 1.5 degrees sampled by a pixel matrix of 128 x 128 elements. Although the method addresses sensor offsets, it can be extended to determine scale as well as rotational differences. The algorithms were developed using video imagery collected with a second generation FUR prototype built by Westinghouse. Algorithms were developed and tested using state of the art image processing software running in a graphics workstation environment.
John G. Romanski,
"Method for registering low resolution IR sensor images with second generation FLIR sensors", Proc. SPIE 2075, Passive Sensors, 207505 (29 January 1992); doi: 10.1117/12.2300233; https://doi.org/10.1117/12.2300233