Detection of near-field occlusions in images
AssigneeThe Regents of the University of Michigan
InventorsSridhar Lakshmanan, Christopher Bargman
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Abstract
A method is presented for detecting occlusions on a color camera. The method includes: capturing an image of a scene using the camera; analyzing intensity of electromagnetic radiation forming the at least one image, where the intensity of the electromagnetic radiation is analyzed across the electromagnetic spectrum; detecting an occlusion on a lens of the camera based on variation of intensity of the electromagnetic radiation across the electromagnetic spectrum; and tagging the image with an indicator of the occlusion, where the tagging occurs in response to detecting an occlusion on the camera.
Claims14
A method for detecting occlusions on a color camera, comprising:
- capturing, by the camera, an image of a scene, where electromagnetic radiation captured by the camera is captured in at least two mutually distinct frequency bands;
- comparing, by an image processor, intensity of electromagnetic radiation in one frequency band to intensity of electromagnetic radiation in another frequency band, where the one frequency band is distinct from the another frequency band and the electromagnetic radiation for the one frequency band is taken from same image as the electromagnetic radiation for the another frequency band;
- and
- detecting, by the image processor, an occlusion on a lens of the camera when the intensity of the electromagnetic radiation in the one frequency band is similar to the intensity of the electromagnetic radiation in the another frequency band.
A system for detecting occlusions on a color camera, comprising:
- a camera configured to capture an image of a scene, where electromagnetic radiation captured by the camera is captured in at least two mutually distinct frequency bands;
- and
- an image processor in data communication with the camera, wherein the image processor analyzes intensity of electromagnetic radiation by comparing the intensity of electromagnetic radiation in one frequency band to the intensity of electromagnetic radiation in another frequency band, where the one frequency band is distinct from the another frequency band and the electromagnetic radiation for the one frequency band is taken from same image as the electromagnetic radiation for the another frequency band, and detects an occlusion of the lens of the camera when the intensity of electromagnetic radiation in the one frequency band is similar to the intensity of electromagnetic radiation in the another frequency band.
A method for detecting occlusions on a color camera, comprising:
- capturing, by the camera, an image of a scene, where electromagnetic radiation captured by the camera is captured in at least two mutually distinct frequency bands;
- comparing, by an image processor, intensity of electromagnetic radiation in one frequency band to intensity of electromagnetic radiation in another frequency band by designating a plurality of bins for each image sensor, such that each bin represents a range of intensity values for electromagnetic radiation;
- assigning each pixel in a given image sensor into one of the plurality of bins;
- and counting, for a given image sensor, a number of pixels classified in each of the plurality of bins;
- and
- detecting, by the image processor, an occlusion on a lens of the camera when the intensity of the electromagnetic radiation in the one frequency band is similar to the intensity of the electromagnetic radiation in the another frequency band.
Dependencies are inferred from the claim text.