I. Sajid, Sotirios G. Ziavras, M. M. Ahmed


Eigen values evaluation is an integral but computation-intensive part for many image and signal processing applications. Modified Gram-Schmidt Orthogonalization (MGSO) is an efficient method for evaluating the Eigen values in face recognition algorithms. MGSO applies normalization of vectors in its iterative orthogonal process and its accuracy depends on the accuracy of normalization. Using software, floating-point data types and floating-point operations are applied to minimize rounding and truncation effects. Hardware support for floating-point operations may be very costly in execution time per operation and also may increase power consumption. In contrast, lower-cost fixed-point arithmetic reduces execution times and lowers the power consumption but reduces slightly the precision. Normalization involves square root operations in addition to other arithmetic operations. Hardware realization of the floating-point square root operation may be prohibitively expensive because of its complexity. This paper presents three architectures, namely ppc405, ppc_ip and pc_pci, that employ fixed-point hardware for the efficient implementation of normalization on an FPGA. We evaluate the suitability of these architectures based on the needed frequency of normalization. The proposed architectures produce a less than 10-3 error rate compared with their software-driven counterpart for implementing floating-point operations. Furthermore, four popular databases of faces are used to benchmark the proposed architectures.


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Paper Citation

in Harvard Style

Sajid I., G. Ziavras S. and M. Ahmed M. (2010). FPGA-BASED NORMALIZATION FOR MODIFIED GRAM-SCHMIDT ORTHOGONALIZATION . In Proceedings of the International Conference on Computer Vision Theory and Applications - Volume 2: VISAPP, (VISIGRAPP 2010) ISBN 978-989-674-029-0, pages 227-232. DOI: 10.5220/0002848702270232

in Bibtex Style

author={I. Sajid and Sotirios G. Ziavras and M. M. Ahmed},
booktitle={Proceedings of the International Conference on Computer Vision Theory and Applications - Volume 2: VISAPP, (VISIGRAPP 2010)},

in EndNote Style

JO - Proceedings of the International Conference on Computer Vision Theory and Applications - Volume 2: VISAPP, (VISIGRAPP 2010)
SN - 978-989-674-029-0
AU - Sajid I.
AU - G. Ziavras S.
AU - M. Ahmed M.
PY - 2010
SP - 227
EP - 232
DO - 10.5220/0002848702270232