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US 11,636,591 B2Granted
Surface imaging using high incident angle of light rays
AssigneeAlibaba Group Holding Limited
InventorsJin Ryong Kim, Hyunjae Gil, Stephanie Chan, Chen Zhao
Life of this patent
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Abstract
A plurality of light sources placed at one end of a surface imaging system may generate and direct light rays to be incident onto a surface to be detected at high incident angles that are greater than or equal to a predetermined angle threshold, the predetermined angle threshold may be set to ensure that images of the surface to be detected that have at least a predetermined degree of contrast are to be obtained. An image sensor that is placed at another end of the surface imaging system may collect light rays reflected from the surface to be detected to form a first image of the surface to be detected.
Claims17
A surface imaging system comprising:
- a plurality of light sources individually placed in different positions at an end of the surface imaging system and configured to generate and direct light rays to be incident onto a surface to be detected at angles that are greater than or equal to a predetermined angle threshold, the predetermined angle threshold being set to ensure that images of the surface to be detected that have at least a predetermined degree of contrast are to be obtained;
- a plurality of polarized filters separately placed in front of the plurality of light sources to allow a particular polarization of the light rays to be incident on the surface to be detected;
- an image sensor placed at another end of the surface imaging system and configured to collect light rays reflected from the surface to be detected to form images of the surface to be detected;
- and
- a processor configured to search for a first image of the surface to be detected that has a desired degree of contrast by instructing the plurality of light sources to change light frequencies and intensities of the light rays to be incident onto the surface to be detected, and instructing the plurality of polarized filters to change an orientation of polarization that the light rays to be incident onto the surface to be detected are allowed to pass through, wherein changing the light frequencies of the light rays to be incident onto the surface to be detected comprises using different light emitting diodes of different frequencies to generate the light rays to be incident onto the surface to be detected.
2 more elements
A method implemented by a surface imaging system, the method comprising:
- generating and directing, by a plurality of light sources individually placed in different positions at an end of the surface imaging system, light rays to be incident onto a surface to be detected at angles that are greater than or equal to a predetermined angle threshold, the predetermined angle threshold being set to ensure that images of the surface to be detected that have at least a predetermined degree of contrast are to be obtained;
- collecting, by an image sensor placed at another end of the surface imaging system, light rays reflected from the surface to be detected to form images of the surface to be detected;
- and
- searching for a first image of the surface to be detected that has a desired degree of contrast by instructing the plurality of light sources to change light frequencies and intensities of the light rays to be incident onto the surface to be detected, and instructing a plurality of polarized filters that are separately placed in front of the plurality of light sources to change an orientation of polarization that the light rays to be incident onto the surface to be detected are allowed to pass through, wherein changing the light frequencies of the light rays to be incident onto the surface to be detected comprises using different light emitting diodes of different frequencies to generate the light rays to be incident onto the surface to be detected.
1 more element
One or more computer readable media storing executable instructions that, when executed by one or more processors of a surface imaging system, cause the one or more processors to perform acts comprising:
- causing a plurality of light sources individually placed in different positions at an end of the surface imaging system to generate and direct light rays to be incident onto a surface to be detected at angles that are greater than or equal to a predetermined angle threshold, the predetermined angle threshold being set to ensure that images of the surface to be detected that have at least a predetermined degree of contrast are to be obtained;
- and
- causing an image sensor placed at another end of the surface imaging system to collect light rays reflected from the surface to be detected to form images of the surface to be detected;
- and
- searching for a first image of the surface to be detected that has a desired degree of contrast by instructing the plurality of light sources to change light frequencies and intensities of the light rays to be incident onto the surface to be detected, and instructing a plurality of polarized filters that are separately placed in front of the plurality of light sources to change an orientation of polarization that the light rays to be incident onto the surface to be detected are allowed to pass through, wherein changing the light frequencies of the light rays to be incident onto the surface to be detected comprises using different light emitting diodes of different frequencies to generate the light rays to be incident onto the surface to be detected.
2 more elements
Dependencies are inferred from the claim text.