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US 10,255,682 B2Granted
Image detection system using differences in illumination conditions
AssigneePixart Imaging Inc.
InventorEn Feng Hsu
Life of this patent
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Abstract
The present disclosure provides a detection system, which includes an image sensor, a lens device, and a processor. The image sensor is configured to take a first picture of a foreground object and a background object. The lens device is attached to the image sensor and configured to allow the foreground object to form a clear image on the first picture and the background object to form a blurred image on the first picture. The processor is configured to determine the image of the foreground object by analyzing the sharpness of the images of the first pictures.
Claims2
A detection system comprising:
- a light source configured to illuminate an object;
- an image sensor configured to receive light reflected from the object, wherein the image sensor generates at least one first picture Im1 under a first illumination condition with the light source turned on and at least one second picture Im2 under a second illumination condition with the light source turned on;
- and
- a processor configured to determine an object image Io from a subtraction between the at least one first picture Im1 and the at least one second picture Im2 according to the equation:
- Io=(Im1−Im2)×M,
- wherein M is greater than 1 and M=N/(N−1) where N is greater than 1, and wherein the second illumination condition is N times less than the first illumination condition.
3 more elements
A detection system comprising:
- a light source configured to illuminate an object;
- an image sensor configured to receive light reflected from the object, wherein the image sensor generates at least one first picture Im1 during a time T1 when the light source is turned on, and generates at least one second picture Im2 during a time T2 when the light source is turned on, wherein T1 is greater than T2;
- and
- a processor configured to determine an object image Io generated from a subtraction between the at least one first picture Im1 and the at least one second picture Im2 according to the equation:
- Io=(Im1−Im2)×M,
- wherein M is greater than 1 and M=N/(N−1) where N is greater than 1, and wherein T1 is N times greater than T2.
3 more elements
Dependencies are inferred from the claim text.