Video signal mixing device for infrared/visible integrated imaging
First Claim
1. A video signal mixing device for superimposing a visible video signal output from a visible camera and an infrared video signal output from an infrared camera, both said cameras being focused on a common object, said video signal mixing device comprising:
- a black level discriminating circuit for discriminating a first part of said infrared video signal lower than a predetermined black level from a second part of said infrared video signal higher than said predetermined black level;
a visible video selecting circuit for enabling output of said visible video signal during the presence of said first part of said infrared video signal lower than said predetermined black level, and selectively disabling output of said visible video signal during the presence of said second part of said infrared video signal higher than said predetermined black level; and
a mixing circuit for superimposing said visible video signal, output from said visible video selecting circuit, and said infrared video signal.
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Accused Products
Abstract
A infrared/visible integrated imaging apparatus having a video signal mixing device for superimposing a visible video signal upon an infrared video signal. The mixing device has a discriminating circuit setting electrical discrimination between an infrared video signal having a level higher than a predetermined black level and having a lower than the predetermined black level. The visible video signal simultaneously output with the infrared video signal having the level higher than a predetermined black level is practically cut off with a visible video signal selecting circuit. The partially cut off video signal is then superimposed on the thermal video signal for display. The level of each of the two video signals is independently controllable.
95 Citations
13 Claims
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1. A video signal mixing device for superimposing a visible video signal output from a visible camera and an infrared video signal output from an infrared camera, both said cameras being focused on a common object, said video signal mixing device comprising:
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a black level discriminating circuit for discriminating a first part of said infrared video signal lower than a predetermined black level from a second part of said infrared video signal higher than said predetermined black level; a visible video selecting circuit for enabling output of said visible video signal during the presence of said first part of said infrared video signal lower than said predetermined black level, and selectively disabling output of said visible video signal during the presence of said second part of said infrared video signal higher than said predetermined black level; and a mixing circuit for superimposing said visible video signal, output from said visible video selecting circuit, and said infrared video signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A video signal mixing method for superimposing a visible video signal output from a visible camera and an infrared video signal output from an infrared camera, both of the cameras viewing a common object, said video signal mixing method comprising the steps of:
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(a) discriminating a first part of the infrared video signal lower than a predetermined black level from a second part of the infrared video signal higher than the predetermined black level; (b) enabling output of the visible video signal during the existance of said first part of the infrared video signal lower than the predetermined black level; (c) disabling output of the visible video signal during the presence of the second part of the infrared video signal higher than the predetermined black level; and (d) superimposing the visible video signal when output enabled and the infrared video signal. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification