Raymond J Dennison

Title: Innovations of Raymond J Dennison

Introduction

Raymond J Dennison is a notable inventor based in West Seneca, NY (US). He has made significant contributions to the field of fingerprint identification technology, holding a total of three patents. His work focuses on enhancing the accuracy and efficiency of fingerprint recognition systems.

Latest Patents

One of Dennison's latest patents is a sophisticated fingerprint identification system. This system utilizes a gray scale image of the fingerprint, converting it into a digitized format. The process involves enhancing the gray scale to ensure uniform contrast across the entire fingerprint image. It also includes down-sampling the enhanced image to limit the number of pixels analyzed. A gradient map of the fingerprint image is generated, and a calculation kernel is defined to determine ridge angles by referencing the gradient map. The kernel traverses the gradient map in predetermined increments, smoothing the ridge angle map through Fourier filtering. Additionally, the image quality map is smoothed using erosion and dilation techniques. The frequency of ridges in the fingerprint image is determined by establishing lines perpendicular to ridge flow and sampling pixels along these lines.

Another aspect of his fingerprint identification system involves comparing one fingerprint to another. For each fingerprint, the location and angle of minutiae are recorded, along with a quality measure for each minutiae. The core and delta locations, as well as the local average image, are also documented. An image state map is created to define high-quality image areas with and without minutiae. In the matching process, ridge angle maps align fingerprint images, followed by a comparison of state maps and minutiae locations. The fingerprints are scored based on the closeness of the match using a dual hypothesis technique.

Career Highlights

Raymond J Dennison is currently employed at Calspan Corporation, where he continues to innovate in the field of fingerprint technology. His work has significantly advanced the capabilities of biometric identification systems.

Collaborations

Dennison has collaborated with notable colleagues, including James R Ort and Douglas L Lange, contributing to the development of cutting-edge technologies in his field.

Conclusion

Raymond J Dennison's contributions to fingerprint identification technology demonstrate his expertise and commitment to innovation. His patents reflect a deep understanding of biometric systems and their applications in security and identification.