Subpixel real-time jitter detection algorithm and implementation for polarimetric and helioseismic imager

David Roma, Manuel Carmona, Jose Bosch, Albert Casas, Atila Herms, Manel Lopez, Oscar Ruiz, Josep Sabater, Thomas Berkefeld, Thorsten Maue, Eiji Nakai, Wolfgang Schmidt (+3 others)
2019 Journal of Astronomical Telescopes Instruments and Systems  
Subpixel real-time jitter detection algorithm and implementation for polarimetric and helioseismic imager," Abstract. The polarimetric and helioseismic imager instrument for the Solar Orbiter mission from the European Space Agency requires a high stability while capturing images, specially for the polarimetric ones. For this reason, an image stabilization system has been included in the instrument. It uses global motion estimation techniques to estimate the jitter in real time with subpixel
more » ... lution. Due to instrument requirements, the algorithm has to be implemented in a Xilinx Virtex-4QV field programmable gate array. The algorithm includes a 2-D paraboloid interpolation algorithm based on 2-D bisection. We describe the algorithm implementation and the tests that have been made to verify its performance. The jitter estimation has a mean error of 1 25 pixel of the correlation tracking camera. The paraboloid interpolation algorithm provides also better results in terms of resources and time required for the calculation (at least a 20% improvement in both cases) than those based on direct calculation.
doi:10.1117/1.jatis.5.3.039003 fatcat:stesgcgtovdj3foog5jti5hzvq