Method and apparatus for detecting objects based upon color sign

Details Method and apparatus for detecting objects based upon color sign Method and apparatus for detecting objects based upon color sign

1987-02-17

1988-01-05

Shepperd, John W.

Image analysis

Histogram processing

For setting a threshold

358 22, 358101, G06K 900, H04N 975

Patent

active

047180897

ABSTRACT:
A chroma keying generator apparatus is disclosed having a monitor camera transmitting color signals to multipliers for separating a luminance signal from an image signal and amplifying same by selected gain levels, comparison circuits for comparing two color signals with pre-selected reference levels therefor having upper and lower limits and producing outputs denoting that the ratio of the color signal to the luminance signal for a given color falls within a pre-selected reference range, and a gate circuit which evaluates the outputs from the comparison circuits to produce pulses representing a logical "1" when the output is within the reference range and a logical "0" when the output is not within the reference range.

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