Channel based projector calibration

Number: 10694160
Published: 2020-06-23
Filed: 2018-11-20
Assignee: DISNEY ENTERPRISES, INC.
Inventors: Tait; Thomas T., Matalone; Clarissa J., Grundhofer; Anselm, Phelan; Lucas T., Reichow; Mark A., Rose; David R.
CPC: G06T3/4015; G06T7/80; G06T7/97; H04N9/3147; H04N9/3182; H04N9/3185; H04N9/3191; H04N9/3194
Verdict: Low Hardware
Source: Google Patents · FreePatentsOnline

The keeper's note

Projector calibration technique, projection hardware (granted).

Abstract

The present disclosure is related to methods and systems for calibrating a projector. The method includes displaying a plurality of calibration patterns, where the calibration patterns are displayed separately by different wavelength channel bands, e.g., red channel, blue channel, green channel. The method then includes receiving by a processing element one or more calibration images. The method then includes determining one or more displacements corresponding to a plurality of pixels in the calibration image with respect to a plurality of pixels in the calibration pattern to adjust for distortions on a per wavelength channel basis.

Background

FIELD(1) The present disclosure relates generally to adjusting projected images from a projector, and more specifically to compensating projected images to neutralize effects chromatic aberration.BACKGROUND(2) Projection systems are used in various fields such as entertainment, amusement park attractions, and augmented reality. Projection systems typically display image pixels as a combination of component primary wavelengths, or colors, of electromagnetic energy, including the spectrum of visible light. To increase image quality, contrast, and sharpness, typically it is desired that the component color pixels display at the same location on a projection surface. However, a phenomenon called chromatic aberration (also chromatic distortion or spherochromatism) affects the way different wavelengths of electromagnetic energy, including light, react to the optical path in different ways. Various wavelengths of energy bend and move different amounts as they travel through the optical path to the projection surface, landing in in undesired locations.(3) Traditional calibration methods used for projectors often may not meet the demands of projection systems with complex projection surface geometry, using non-standard lenses, or other non-traditional uses. Additionally, calibration methods typically are time and labor intensive, subject to the skill, experience, priorities, techniques, and qualitative judgment of the individual technician performing the work. The resulting calibratio

Claims

1. A calibration method to calibrate a projector comprising a first light channel and a second light channel, the method comprising: displaying by the projector utilizing the first light channel a first calibration pattern onto a projection surface, wherein the first light channel emits light within a first wavelength band that does not overlap with light wavelengths projected by the second light channel; capturing by a camera a first calibration image of the first calibration pattern on the projection surface; and generating by a processing element a first corrective pixel map by comparing the first calibration image to the first calibration pattern. 6. A method for correcting visual media content comprising: receiving by a processing element visual media content; separating the visual media content into a first media portion corresponding to a first primary color channel; modifying by the processing element the first media portion to generate a first output media portion by translating input pixels to corrective pixels utilizing a corrective pixel map corresponding to the first primary color channel; and displaying the first output portion by a projector. 12. A projector comprising: a camera; a light source to project images onto a projection surface; and a computer in communication with the camera and the light source, the computer comprising a processor configured to perform the following operations: display a first calibration pattern in a first light channel of the light source; receive by the camera a first calibration image of the first calibration pattern; generate by a processing element a first corrective pixel map by comparing the first calibration image to the first calibration pattern; and modify by the processing element an input media to generate a first output media by translating input pixels to corrective pixels utilizing the first corrective pixel map; and display the first output media by the light source. 18. A projection system comprising: an image capturing device; a light source comprising two or more light channels corresponding to select light wavelengths that project images onto a projection surface; and a processor in communication with the image capturing device and the light source, configured to perform the following operations: activate a first light channel to display a first calibration pattern on the projection surface; receive from the image capturing device a first calibration image of the first calibration pattern as projected on the projection surface; generate a first corrective pixel map by comparing the first calibration image to the first calibration pattern; modify an input media to generate a first output media by translating input pixels of an input media to corrective pixels utilizing the first corrective pixel map; and activate the light source to display the first output media.