US 11,379,946 B2Granted

Image projection system controlling method and image projection system

AssigneeSeiko Epson Corporation

InventorTaisuke Yamauchi

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Abstract

A projector is provided with a correction information generator and an image information corrector described below. The correction information generator estimates a reference plane having a normal vector that is the cross product of the average of normal vectors in N regions in the result of measurement of the shape of a projection surface and a first vector corresponding to a component having the largest degree of dispersion among the N normal vectors. The correction information generator estimates an imaginary projection surface by causing the result of projection of the projection surface on the reference surface to rise upright with respect to the reference surface and generates image correction information based on the imaginary projection surface. The image information corrector generates correction image information from image information on a projection image and the correction information. The projector projects an image based on the correction image information on the projection surface.

Claims4

Dependent claims

An image projection system controlling method comprising:

estimating a normal vector in each of N regions, into which a projection surface on which an image is projected is divided, based on measurement information, which is a result of three-dimensional measurement of a shape of the projection surface;
calculating an average normal vector that is an average of the N normal vectors;
calculating a first vector along an axis corresponding to a component having a largest degree of dispersion among the N normal vectors out of three-axis components representing the vector;
estimating a reference plane having a normal vector that is a cross product of the first vector and the average normal vector;
estimating an imaginary projection surface that is a surface that is based on a result of projection of the three-dimensional shape of the projection surface indicated by the measurement information on the reference plane and is perpendicular to the reference plane;
generating correction information for image correction based on the imaginary projection surface;
correcting a projection image based on the correction information;
and
projecting the corrected projection image on the projection surface,
wherein N is an integer greater than or equal to two.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/314,864Filed 7 May 2021
Priority: JP JP2020-0825398 May 2020
Published: US 2021/0350501 A111 Nov 2021
Granted: 5 Jul 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G06T 3/08
Geometric image transformations in the plane of the image: projecting images onto non-planar surfaces, e.g. geodetic screens
G06T 7/33
Determination of transform parameters for the alignment of images, i.e. image registration: using feature-based methods
G06T 7/521
Depth or shape recovery: from laser ranging, e.g. using interferometry; from the projection of structured light
G06T 7/73
Determining position or orientation of objects or cameras: using feature-based methods