Pupil detection device
AssigneePixart Imaging Inc.
InventorsYu-Hao HUANG, Ming-Tsan KAO, Yi-Fang LEE, En-Feng HSU, Meng-Huan HSIEH, Nien-Tse CHEN
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Abstract
There is provided a pupil tracking device including an active light source, an image sensor and a processing unit. The active light source emits light toward an eyeball alternatively in a first brightness value and a second brightness value. The image sensor captures a first brightness image corresponding to the first brightness value and a second brightness image corresponding to the second brightness value. The processing unit identifies a brightest region at corresponding positions of the first brightness image and the second brightness image as an active light image.
Claims20
A pupil tracking device, comprising:
- an active light source emitting light toward an eyeball alternatively in a first brightness value and a second brightness value;
- an image sensor capturing a first brightness image corresponding to the first brightness value and a second brightness image corresponding to the second brightness value;
- and
- a processing unit configured to identify a brightest region at corresponding positions in the first brightness image and the second brightness image as an active light image.
A pupil tracking device, comprising:
- an active light source emitting light toward an eyeball alternatively in a first brightness value and a second brightness value;
- an image sensor capturing a first brightness image corresponding to the first brightness value and a second brightness image corresponding to the second brightness value;
- and
- a processing unit configured to calculate a differential image between the first brightness image and the second brightness image and to identify a darkest region in the differential image as an active light image.
A pupil tracking device, comprising:
- at least two active light sources alternatively emitting light toward an eyeball;
- an image sensor capturing a first image frame and a second image frame corresponding to lighting of different of the active light sources;
- and
- a processing unit configured to calculate a differential image between the first image frame and the second image frame and to identify a darkest region and a brightest region in the differential image as active light images.
Dependencies are inferred from the claim text.