Auto keystone correction and auto focus adjustment

Patent metadata

Field	Value
Publication number	US-2017374331-A1
Application number	US-201615193964-A
Country	US
Kind code	A1
Filing date	Jun 27, 2016
Priority date	Jun 27, 2016
Publication date	Dec 28, 2017
Grant date	—

Abstract

An apparatus and method for performing automatic keystone correction and automatic focus correction in a system. In one embodiment, the method comprises analyzing an image projected on a projection surface by a projector of a device and captured by one or more cameras of the device to determine whether shape of the image indicates keystone correction is needed and adjusting display output of the projector to cause the display output to be rectangular on the projection surface.

First claim

1 . A method comprising:
analyzing an image projected on a projection surface by a projector of a device and captured by one or more cameras of the device to determine whether shape of the image indicates keystone correction is needed, wherein analyzing the image comprises generating parameters from the image captured by the one or more cameras; and adjusting display output of the projector based on the parameters generated from the image to cause the display output to be rectangular on the projection surface.

2 . The method defined in claim 1 further comprising generating projection distortion parameters in response to analyzing the image.

3 . The method defined in claim 2 further comprising:
sending the projection distortion parameters to a display controller of the projector; and
correcting, by the projector display controller, the display output of the projector.

4 . The method defined in claim 2 further comprising:
adjusting the display output to be rectangular prior to sending the display output to a display controller of the projector; and
sending keystone corrected display output to the projector display controller for projection on the projection surface by the projector.

5 . The method defined in claim 1 further comprising:
determining whether an image projected by a projector of a device is out of focus; and
adjusting focus of the projector output based on depth information obtained from images captured from one or more cameras of the device.

6 . The method defined in claim 5 wherein adjusting the focus of the image comprises adjusting a motor of an optical engine of the projector to adjust the focus of the projector.

7 . A system comprising:
a projector; one or more cameras; and a processor coupled to the projector and the one or more cameras and operable to analyze an image projected on a projection surface by a projector of a device and captured by one or more cameras of the device to determine whether shape of the image indicates keystone correction is needed, generate parameters from the image captured by the one or more cameras, and adjust display output of the projector based on the parameters generated from the image captured by the one or more cameras to cause the display output to be rectangular on the projection surface.

8 . The system defined in claim 7 wherein the processor is operable to generate projection distortion parameters in response to analyzing the image.

9 . The system defined in claim 8 further comprising a projector display controller coupled to the projector and the processor, wherein the processor is operable to send the projection distortion parameters to a display controller of the projector and the projector display controller is operable to correct the display output of the projector based on the projection distortion parameters.

10 . The system defined in claim 8 further comprising a projector display controller coupled to the projector and the processor, wherein the processor is operable to adjust the display output to be rectangular prior to sending the display output to a display controller of the projector and send keystone corrected display output to the projector display controller for projection on the projection surface by the projector.

11 . The system defined in claim 7 wherein the processor is operable to determine whether an image projected by the projector is out of focus and to adjust focus of the projector output based on depth information obtained from images captured from the one or more cameras of the device.

12 . The system defined in claim 11 wherein the projector comprises an optical engine, and further comprising a display controller coupled to the projector and the processing device, wherein the processor is operable to adjust the focus of the image by adjusting a motor of the optical engine of the projector to adjust the focus of the projector by sending commands to the display controller.

13 . An article of manufacture having one or more non-transitory computer readable storage media storing instructions which when executed by a system to perform a method comprising:
analyzing an image projected on a projection surface by a projector of a device and captured by one or more cameras of the device to determine whether shape of the image indicates keystone correction is needed, wherein analyzing the image comprises generating parameters from the image captured by the one or more cameras; and adjusting display output of the projector based on the parameters generated from the image to cause the display output to be rectangular on the projection surface.

14 . The article of manufacture defined in claim 13 wherein the method further comprises generating projection distortion parameters in response to analyzing the image.

15 . The article of manufacture defined in claim 14 wherein the method further comprises:
sending the projection distortion parameters to a display controller of the projector; and
correcting, by the projector display controller, the display output of the projector.

16 . The article of manufacture defined in claim 14 wherein the method further comprises:
adjusting the display output to be rectangular prior to sending the display output to a display controller of the projector; and
sending keystone corrected display output to the projector display controller for projection on the projection surface by the projector.

17 . A method comprising:
determining whether an image projected by a projector of a device is out of focus; adjusting focus of the projector output based on depth information obtained from images captured from one or more cameras of the device; and performing keystone correction on the images captured from the one or more cameras by generating parameters from each image captured by the one or more cameras and adjusting display output of the projector based on the parameters to cause the display output to be rectangular on a projection surface.

18 . The method defined in claim 17 wherein adjusting the focus of the image comprises adjusting a motor of an optical engine of the projector to adjust the focus of the projector.

19 . The method defined in claim 17 further comprising:
capturing image data with the one or more cameras, the image data being of the image projected on a projection surface from the projector; and
obtaining measurements of a distance to the projection surface based on analysis of the image data.

20 . A system comprising:
a projector; one or more cameras; and a processor coupled to the projector and operable to determine whether an image projected by the projector is out of focus and to adjust focus of the projector output based on depth information obtained from images captured from the one or more cameras of the device and to perform keystone correction on an image captured from the one or more cameras by generating parameters from the image captured by the one or more cameras and adjusting display output of the projector based on the parameters to cause the display output to be rectangular on a projection surface.

21 . The system defined in claim 20 wherein the projector comprises an optical engine, and further comprising a display controller coupled to the projector and the processing device, wherein the processor is operable to adjust the focus of the image by adjusting a motor of the optical engine of the projector to adjust the focus of the projector by sending commands to the display controller.

Assignees

• Intel Corp

Inventors

• Liu Tim
• Juan Gerry
• Tsai Simon
• Ku Jeff
• Sung Gavin

Classifications

• H04N9/3185 Primary

  Geometric adjustment, e.g. keystone or convergence (optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14) · CPC title

• H04N9/3194

  including sensor feedback · CPC title

• G01B11/2504

  Calibration devices · CPC title

• H04N13/254

  in combination with electromagnetic radiation sources for illuminating objects · CPC title

• G03B21/53

  Means for automatic focusing, e.g. to compensate thermal effects · CPC title