Image analysis – Applications – Biomedical applications
Patent
1998-11-19
2000-09-12
Mehta, Bhavesh
Image analysis
Applications
Biomedical applications
382168, 382172, G06K 900
Patent
active
061188921
ABSTRACT:
A method for automatically forming a filtered subset of digital values from a first set of digital values corresponding to a plurality of picture elements representing a radiographic exposure of a subject for use in displaying a radiograph of said subject, the method comprising: (1) generating a first histogram of the first set of digital values; (2) generating an integral curve representing an integral of the first histogram; (3) identifying an inflection point and corresponding digital value V.sub.peak1 on the first histogram integral where the integral curve first changes slope in a direction decreasing from the highest digital value; (4) calculating a parameter V.sub.test =V.sub.peak1 -AR wherein AR represents an anatomical range of the subject; (5) spatially dividing the first set of digital values into multiple block subsets of digital values, each block subset comprising digital values from a neighborhood of pixels consisting of a predetermined number of picture elements; (6) constructing a subset histogram representing the frequency of occurrence of digital values within each block subset; (7) determining a low point of each block subset, BV.sub.low, corresponding to a predetermined low point of the subset histogram; (8) comparing each BV.sub.low to V.sub.test ; and (9) forming the filtered subset of digital values from the digital values of all the block subsets having BV.sub.low greater than V.sub.test.
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"Automatic Setting Functions for Image Density and Range in the FCR System." by N. Nakajima, H. Takeo, M. Ishida, and T. Nagate. Fuji Computed Radiography Technical Review No. 3, pp. 1-23, No Date.
Direct Radiography Corp.
Mehta Bhavesh
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