Apparatus and method for acquiring differential image
First Claim
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1. An apparatus for acquiring a differential image, comprising:
- a camera configured to acquire a first image and a second image at the same point in time using an image sensor, wherein the image sensor includes;
a first layer sensor for acquiring the first image including environment light and infrared polarized light from an illuminating unit;
a second layer sensor for acquiring the second image including horizontal polarized light of the environment light;
a polarizing filter, disposed between the first and second layer sensors, for blocking polarized light in the same direction as that of the infrared polarized light; and
a processor coupled to the camera and configured to;
correct brightnesses of background areas of the first and second images; and
generate a differential image between the first and second images of which the brightnesses of the background areas are corrected,wherein the second layer sensor senses light passing through the polarizing filter to acquire the second image.
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Abstract
An apparatus for acquiring a differential image includes: an image acquiring unit acquiring a first image including environment light from an image sensor of a camera and infrared polarized light from an illuminating unit and a second image including horizontal polarized light of the environment light; an image correcting unit correcting brightnesses of background areas of the first and second images; and a differential image generating unit generating a differential image between the first and second images of which the brightnesses of the background areas are corrected.
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9 Claims
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1. An apparatus for acquiring a differential image, comprising:
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a camera configured to acquire a first image and a second image at the same point in time using an image sensor, wherein the image sensor includes; a first layer sensor for acquiring the first image including environment light and infrared polarized light from an illuminating unit; a second layer sensor for acquiring the second image including horizontal polarized light of the environment light; a polarizing filter, disposed between the first and second layer sensors, for blocking polarized light in the same direction as that of the infrared polarized light; and a processor coupled to the camera and configured to; correct brightnesses of background areas of the first and second images; and generate a differential image between the first and second images of which the brightnesses of the background areas are corrected, wherein the second layer sensor senses light passing through the polarizing filter to acquire the second image. - View Dependent Claims (2, 3, 4, 5)
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6. A method for acquiring a differential image, comprising:
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acquiring, by a camera, a first image including environment light and infrared polarized light from an illuminating unit and a second image including horizontal polarized light of the environment light at the same point in time using an image sensor, wherein the image sensor includes; a first layer sensor for acquiring a first image; a second layer sensor, disposed to face the first layer sensor, for acquiring a second image; and a polarizing filter, disposed between the first and second layer sensors, for blocking polarized light in the same direction as that of the infrared polarized light; correcting, by a processor, brightnesses of background areas of the first and second images; and generating, by the processor, a differential image between the first and second images of which the brightnesses of the background areas are corrected, wherein the second layer sensor senses light passing through the polarizing filter to acquire the second image. - View Dependent Claims (7, 8, 9)
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Specification