Imaging systems and methods for user input detection
View Patent ↗An imaging system may be provided that includes a camera module, a transparent or translucent surface, and processing circuitry that is configured to perform character recognition operations based on images of the translucent surface that have been captured using the camera module. The camera module may include an image sensor having an array of image pixels and one or more lenses that focus light from the translucent surface onto the array of image pixels. The processing circuitry may be configured to recognize gestures from one or more users on the translucent surface. The processing circuitry may be configured to extract user input data from captured images of an object seen through the translucent surface by extracting gesture point locations from the captured images, storing coordinate data associated with the extracted gesture point locations, and comparing the stored coordinate data with template data that corresponds to a plurality of known characters.
1. An imaging system, comprising:
an image sensor;
a surface that is at least partially translucent;
a lens that focuses light from the surface onto the image sensor; and
processing circuitry configured to operate the image sensor to capture images of an object through the surface and to extract user input data from the captured images of the object, wherein the processing circuitry comprises memory, and wherein the processing circuitry is configured to extract the user input data from the captured images of the object by extracting gesture point locations from the captured images, to store coordinate data associated with the extracted gesture point locations using the memory, to rotate the stored coordinate data, to scale distances between the coordinate data, and to compare the scaled and rotated coordinate data with template data associated with a plurality of characters.
2. The imaging system defined in claim 1 wherein the image sensor is formed on an image sensor integrated circuit and wherein the processing circuitry is at least partially formed on a companion integrated circuit.
3. The imaging system defined in claim 1 wherein the surface comprises a surface of a table.
4. The imaging system defined in claim 3 , further comprising:
at least one additional image sensor; and
at least one additional lens that focuses additional light from the surface onto the additional image sensor.
5. The imaging system defined in claim 4 wherein the user input data comprises at least one character.
6. The imaging system defined in claim 1 wherein the surface comprises a portion of an enclosure for a laptop computer.
7. The imaging system defined in claim 6 wherein the image sensor and the lens are formed within the enclosure.
8. The imaging system defined in claim 7 , further comprising:
at least one additional image sensor in the enclosure; and
at least one additional lens in the enclosure that focuses additional light from the surface onto the additional image sensor.
9. The imaging system defined in claim 8 wherein the user input data comprises at least one character.