US Patent No. 9,292,735

LIVING BODY RECOGNIZING DEVICE


Patent No. 9,292,735
Issue Date March 22, 2015
Title Living Body Recognizing Device
Inventorship Nobuharu Nagaoka, Saitama (JP)
Makoto Aimura, Saitama (JP)
Kodai Matsuda, Saitama (JP)
Assignee Honda Motor Co., Ltd., Tokyo (JP)

Claim of US Patent No. 9,292,735

1. A living body recognizing device, comprising:
a captured image acquiring unit which acquires a captured image having a characteristics that a luminance of an image portion
of a target object becomes higher as a temperature of the target object becomes higher than a background, and the luminance
of the image portion of the target object becomes lower as the temperature of the target object becomes lower than the background,
according to a temperature difference between the background and the target object, using an infrared camera;

a living body image extracting unit which sets for the luminance, a first threshold value and a second threshold value which
is higher than the first threshold value, and which executes a first living body image extracting processing of extracting
the image portion of the target object assumed to be a living body, from a region of the captured image in which the luminance
is equal to or lower than the first threshold value, regardless of whether or not an area of the region in which the luminance
is equal to lower than the first threshold value is larger than an area of a region in which the luminance is higher than
the first threshold value and executes a second living body image extracting processing which extracts the image portion of
the target object assumed to be the living body from a region in the captured image in which the luminance is equal to or
higher than the second threshold value with respect to an identical range as a range of the captured image in which the first
living body image extracting processing is executed; and

a living body recognizing unit which recognizes an existence of the living body, where present, based on the image portion
of the target object extracted by the living body image extracting unit.