Peak detector and imaging system

Boots – shoes – and leggings

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250214DC, G06F 738, H01J 4014

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active

048191973

ABSTRACT:
A circuit for detecting the positions and intensities of peaks in a digital input signal (which may be a digitized version of a signal from a CCD forming part of a three dimensional imaging device) employs a second derivative of the input signal for validating the presence of each input peak. Each validation signal enables an interpolation circuit that determines the position of a peak by finding the location of a zero crossing point of a first derivative of the input signal. Each validation signal also enables a maximum detector for measuring the intensity of each peak. The arrangement does not require resetting after each detection of a peak and is less sensitive than prior devices to noise or DC or low frequency components.

REFERENCES:
patent: 4394683 (1983-07-01), Liptay-Wagner et al.
patent: 4645347 (1987-02-01), Rioux
patent: 4658358 (1987-04-01), Blais
Blais et al., "Real-Time Numerical Peak Detector" Signal Processing, vol. 11, No. 2, Sep. 1986, pp. 145-155.
Rioux, M. et al., "Compact Three-Dimensional Camera for Robotic Applications" J. Opt. Soc. Am. A., vol. 3, No. 9, Sep. 1986, pp. 1518-1521.
Blais, F. et al., "Optics, Illumination, and Image Sensing for Machine Vision-BIRIS: A Single 3D Sensor" Proceedings of SPIE International Society for Optical Engineering, vol. 728, 1986.

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