Plume or combustion detection by time sequence differentiation

Details Plume or combustion detection by time sequence differentiation Plume or combustion detection by time sequence differentiation

1995-05-25

1998-08-11

Shalwala, Bipin

Image analysis

Pattern recognition

Template matching

89 111, 244 316, 244 317, 347117, 347169, 364462, 250342, 382103, 382203, 382286, 382318, G06K 900, G06K 946, G06K 968, G06K 936

Patent

active

057938890

ABSTRACT:
A method and system of image modulation detection of an aircraft exhaust plume by time sequence differentiation is provided. The method comprises the steps of forming two sequential images of the field of view in which an exhaust plume to be detected is located, and forming a differential image from the sequential images showing components of the aircraft's exhaust plume that are modulating at a rate greater than the frame rate of the detection system. The nonmodulating components such as the sky hills, and even the missile body are eliminated from the differential image. Only the plume remains and only the plume is detected. Therefore there is not false alarm note. Each image is formed by a plurality of pixels, wherein each pixel images a portion of the field of view. A value is assigned to each pixel in each of the sequential images that corresponds to one or more characteristics of the pixel. The value of each pixel in one sequential image is subtracted from the value of the corresponding pixel in the other sequential image to produce a value for a resultant pixel. The differential image is formed by imaging the resultant pixels that have a non-zero value, wherein the differential image shows components of the aircraft's exhaust plume that are modulating at a rate greater than the frame rate of the detection system.

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patent: 5596509 (1997-01-01), Karr

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