Increasing demand of high-speed portable modules for multimedia applications has motivated the development of hardware-based solutions for image processing applications. Most of the nonrigid image registration algorithms are found to be unsuitable for hardware implementation because of their nonlinearity and computationally intensive nature. In this paper, an algorithm for nonrigid image registration based on Demons approximation is proposed. The algorithm has been simulated in MATLAB and results show a 15% improvement in peaksignal-to-noise-ratio with a 17% reduction in registration time for 256 × 256 image over the original Demons algorithm. The proposed algorithm is synthesized in Virtex6-xc6vlx760-2-ff1760 and maximum synthesized frequency is found to be 174 MHz. The proposed architecture provides the low cost, high-speed solution for the registration process, which is also helpful for making a portable system.
Index Terms-Demons algorithm, image registration, nonrigid registration.1063-8210
Image registration is the process of aligning two images of different modalities or images acquired at different times using the same modality. Minimization of the alignment error with less computation is a challenging task especially in a medical imaging system. To deform the image for alignment with reference image, the Demons deformation algorithm has been used extensively. This paper presents some modification in Demons deformation algorithm which helps to reduce alignment error as well as runtime by 25% and 33% respectively.
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