Optical filtering methods and structures for incremental scanning systems
Abstract
Abstract THIS DISCLOSURE DEPICTS A METHOD FOR PRODUCING ISOPHOTE RECORDS FROM A PHOTOGRAPHIC TRANSPARENCY RECORD OR THE LIKE. THE DISCLOSURE FURTHER DEPICTS NOVEL APPARATUS FOR ASSISTING IN PRACTICING THE DESCRIBED METHOD, COMPRISING A MICRODENSITOMETER FOR OPTICALLY SCANNING A SPECIMEN CARRYING INFORMATION IN TERMS OF DENSITY DIFFERENCES COMBINED WITH A WRITE-OUT DEVICE RESPONSIVE TO THE MICRODENSITOMETER FOR FORMING AN ISOPHOTE RECORD CHARACTERIZING THE DENSITY VARIATIONS IN THE SCANNED SPECIMEN. THE DISCLOSURE EMPHASIZES LINEAR FILTERING METHODS AND STRUCTURES FOR USE IN MOCRODENSITOMETRY WITH PARTICULAR ATTENTION TO SCANNING APERTURE FILTERS HAVING TRANSMITTANCE FUNCTIONS OPTIMIZED TO ACCOMPLISH DESIRED FILTERING OPERATIONS. AN EXEMPLARY FILTER FOR SUPPRESSING GRAIN NOISE IS SHOWN.
Inventors
- 👤 Richard J Becherer
- 👤 George B Parrent Jr
- 👤 Thomas J Skinner
Bibliographic Details
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