3 August 1984 Computer-Aided Video Differential Planimetry
Author Affiliations +
Abstract
THE VIDEO DIFFERENTIAL PLANIMETER (VDP)1 is a re-mote sensing instrument that can measure minute changes in the area of any object seen by an optical scanning system. The composite video waveforms obtained by scanning the object against a contrasting back-ground are amplified and shaped to yield a sequence of constant amplitude pulses whose polarity distinguishes the studied area from its background and whose varying widths reflect the dynamics of the viewed object. These pulses are passed through a relatively long time-constant capacitor-resistor circuit and are then fed into an integrator. The net integration voltage resulting from the most recent sequence of object-background time pulses is recorded and the integrator is returned to zero at the end of each video frame. If the object's area remains constant throughout the following frame, the integrator's summation will also remain constant. However, if the object's area varies, the positive and negative time pulses entering the integrator will change, and the integrator's summation will vary proportionately. The addition of a computer interface and a video recorder enhances the versatility and the resolving power of the VDP by permitting the repeated study and analysis of selected portions of the recorded data, thereby uncovering the major sources of the object's dynamics. Among the medical and biological procedures for which COMPUTER-AIDED VIDEO DIFFERENTIAL PLANIMETRY is suitable are Ophthalmoscopy, Endoscopy, Microscopy, Plethysmography, etc. A recent research study in Ophthalmoscopy2 will be cited to suggest a useful application of Video Differential Planimetry.
© (1984) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Tobin, Ben D. Djoleto, "Computer-Aided Video Differential Planimetry", Proc. SPIE 0515, Medical Images and Icons, (3 August 1984); doi: 10.1117/12.964756; https://doi.org/10.1117/12.964756
PROCEEDINGS
4 PAGES


SHARE
RELATED CONTENT

Restoration and enhancement of earth images from a low cost...
Proceedings of SPIE (September 16 1993)
Interframe Coding Of Monochrome Television - A Review
Proceedings of SPIE (December 13 1976)
Colorization Of Schlieren Images
Proceedings of SPIE (September 14 1977)
Low cost system for real time integration of virtual and...
Proceedings of SPIE (December 27 2000)
Multi Video Sensor
Proceedings of SPIE (February 20 1973)

Back to Top