Corrected projection perspective distortion

• US 10,158,834 B2
• Filed: 08/30/2016
• Issued: 12/18/2018
• Est. Priority Date: 08/30/2016
• Status: Active Grant

• Current Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Original Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Inventors: Todeschini, Erik
• Primary Examiner(s): Natnael, Paulos M
• Application Number:
  US15/250,984
• Publication Number:
  US 20180063495A1
• Time in Patent Office: 840 Days
• Field of Search: 348744, 348745, 348181, 348189, 348175-178
• CPC Class Codes: H04N 9/3185 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 Class Codes: H04N 9/3191 Testing thereof testing of displays in general G09G3/006
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

Projecting an image is described. A test pattern is rendered over each of two dimensions of a projection surface. Upon the rendered test pattern conforming to a perspective related specification for a spatial configuration of data disposed over the two dimensions the data are decoded. An angle of a projection in each of the two dimensions corresponding to the rendering of the test pattern is detected, relative to a line orthogonal to a plane corresponding to a portion of the projection surface. Upon a nonconformity of the rendered test pattern to the specification, a transformation is computed to a spatial configuration of the rendered test pattern. The computed transformation relates to a perspective related characteristic of the spatial configuration corresponding to the angle of the projection. The projector is controlled based on the computed transformation.

Claims

1. A system for projecting an image, the system comprising:

a projector operable for rendering a test pattern over each of two dimensions of a projection surface, the rendered test pattern being one or more of a two dimensional (2D) barcode, Quick Response (QR) code, and a Han Xin code;

a scanner operable, upon the rendered test pattern conforming to a perspective related specification for a spatial configuration of barcode data disposed over the two dimensions, for reading data encoded therewith;

a sensor operable for detecting an angle of a projection in each of the two dimensions corresponding to the rendering of the test pattern, relative to a line orthogonal to a plane corresponding to a portion of the projection surface; and

a processor operable for computing a spatial transformation over the rendered test pattern, upon a nonconformity thereof to the specification, the computed transformation comprising a perspective adjustment related to the angle of the projection, and for controlling the projector based on the computed transformation,

wherein the processor is operable, further, in relation to the controlling of the projector based on the computed transformation, for one or more of causing, commanding, configuring, or programming the projector to render the test pattern,

wherein the sensor is operable, further, for repeating the detecting of the angle of the projection, and

wherein the processor is operable, further and heuristically, for repeating the computing of the transformation, and the controlling of the projector based on the computed transformation.

2. The system as described in claim 1, wherein the projector is operable, further, upon the reading of the data encoded with the rendered test pattern, for rendering the image upon the projection surface.

3. The system as described in claim 2, wherein the projector is operable, in relation to the rendering of the image upon the projection surface, for the rendering of the image based on the computed transformation.

4. The system as described in claim 1, wherein the nonconformity of the test pattern relates to a distortion of the spatial configuration over one or more of the two dimensions.

5. The system as described in claim 4, wherein the spatial configuration comprises a rectangular plane, and wherein the distortion comprises a trapezoidal distortion disposed over the rectangular plane.

6. The system as described in claim 1, wherein the sensor comprises one or more of:

an accelerometer;

a gyroscope;

or

a device related to a microelectromechanical system (MEMS).

7. The system as described in claim 1, wherein the specification comprises one or more of:

a technical standard ‘

ANSI/UCC5’

of an authority comprising;

American National Standards Institute (ANSI);

or

a technical standard ‘

ISO/IEC 12516’

of an authority International Electrotechnical Commission (IEC), and an authority International Organization for Standardization (ISO).

8. The system as described in claim 1, further comprising a non-transitory computer-readable storage medium operable for exchanging data signals with the processor and comprising instructions relation to one or more operations of the processor.

9. A method for projecting an image, the method comprising the steps of:

rendering a test pattern over each of two dimensions of a projection surface, the rendered test pattern being one or more of a two dimensional (2D) barcode, Quick Response (QR) code, and a Han Xin code;

determining a conformity of the rendered test pattern with a perspective related specification for spatial configuration of barcode data disposed over the two dimensions;

based on the determining step comprising a determination that the rendered test pattern conforms to the specification, reading data encoded with the rendered test pattern;

based on the determining step comprising a determination that the rendered test pattern comprises a perspective related nonconformity related to the specification;

detecting an angle of a projection in each of the two dimensions corresponding to the rendering of the test pattern, relative to a line orthogonal to a plane corresponding to at least a portion of the projection surface;

computing a transformation to a spatial configuration of the rendered test pattern, wherein a perspective related characteristic of the spatial configuration corresponding to the angle of the projection is transformed; and

controlling the rendering of the test pattern step based on the computed transformation; and

repeating, heuristically, one or more of the steps of detecting the angle of the projection, computing the transformation to the spatial configuration of the rendered test pattern, or controlling the rendering of the test pattern based on the computed transformation,

wherein the computing the transformation to the spatial configuration comprises sequentially skewing the test pattern horizontally, then vertically, and then a combination of horizontally and vertically until the test pattern is successfully decoded.

10. The method as described in claim 9, further comprising the step of:

rendering the image upon the projection surface.

11. The method as described in claim 10, wherein the rendering of the image step is based on the computed transformation.

12. The method as described in claim 9, wherein upon the controlling of a projector based on the computed transformation, the rendering of the test pattern comprises rendering the test pattern based on the computed transformation.

13. The method as described in claim 9, wherein the nonconformity of the test pattern relates to a distortion of the spatial configuration over one or more of the two dimensions.

14. The method as described in claim 13, wherein the spatial configuration comprises a rectangular plane, and wherein the distortion comprises a trapezoidal distortion disposed over the rectangular plane.

15. The method as described in claim 9, wherein the specification comprises:

a technical standard ‘

ANSI/UCC5’

of an American National Standards Institute (ANSI) authority;

or

a technical standard ‘

ISO/IEC 12516’

of an International Electrotechnical Commission (IEC) authority, and an International Organization for Standardization (ISO) authority.

16. A non-transitory computer-readable storage medium, comprising instructions, which upon execution by one or more processors, causes, configures, controls, effectuates, or programs a method for projecting an image, the method comprising the steps of:

rendering a test pattern over each of two dimensions of a projection surface, the rendered test pattern being one or more of a two dimensional (2D) barcode, Quick Response (QR) code, and a Han Xin code;

determining a conformity of the rendered test pattern with a perspective related specification for spatial configuration of barcode data disposed over the two dimensions;

based on the determining step comprising a determination that the rendered test pattern conforms to the specification, reading data encoded with the rendered test pattern, and upon the reading of the data, projecting the image;

based on the determining step comprising a determination that the rendered test pattern comprises a perspective related nonconformity related to the specification;

detecting an angle of a projection in each of the two dimensions corresponding to the rendering of the test pattern, relative to a line orthogonal to a plane corresponding to a portion of the projection surface;

computing a transformation to a spatial configuration of the rendered test pattern, wherein a perspective related characteristic of the spatial configuration corresponding to the angle of the projection is transformed; and

controlling the rendering of the test pattern step based on the computed transformation; and

repeating, heuristically, one or more of the steps of detecting the angle of the projection, computing the transformation to the spatial configuration of the rendered test pattern, or controlling the rendering of the test pattern based on the computed transformation,

wherein the computing the transformation to the spatial configuration comprises sequentially skewing the test pattern horizontally, then vertically, and then a combination of horizontally and vertically until the test pattern is successfully decoded.