Depth value measurement
AssigneeCanon Kabushiki Kaisha
InventorsSiu-Kei Tin, Jinwei Ye
Life of this patent
Estimating the term…
Abstract
A depth value of an object is measured. The object is illuminated with a luminaire comprising at least three or more pixel-layers including a first pixel-layer, a second pixel-layer and a third pixel-layer, each pixel-layer including a rectangular array of pixels. One or more images are captured of the object illuminated by the pixel-layers of the luminaire. The depth value of a point on the surface of the object is determined based on the one or more captured images. The spaced-apart pixel-layers of the luminaire are grouped into at least a front group and a back group, and the front group is separated from the back group by a distance that is relatively large as compared to a distance by which the spaced-apart pixel-layers within any one group are separated.
Claims24
A method for measuring a depth value of an object, the method comprising:
- illuminating the object with a luminaire comprising at least three or more spaced-apart pixel-layers including a first pixel-layer, a second pixel-layer and a third pixel-layer, each pixel-layer including a rectangular array of pixels;
- capturing one or more images of the object illuminated by the pixel-layers of the luminaire;
- and
- determining the depth value of a point on the surface of the object based on the one or more captured images,
- wherein the spaced-apart pixel-layers of the luminaire are grouped into at least a front group and a back group, and wherein the front group is separated from the back group by a distance that is relatively large as compared to a distance by which the spaced-apart pixel-layers within any one group are separated.
A method for measuring a depth value of an object, the method comprising:
- a first illuminating step of illuminating the object with first and second pixel-layers of a luminaire, wherein the luminaire comprises three or more spaced-apart pixel-layers including the first and second pixel-layers and a third pixel-layer, each pixel-layer including a rectangular array of pixels;
- capturing one or more images of the object illuminated with the first and second pixel-layers of the luminaire;
- estimating a preliminary pixel correspondence between pixels of the third pixel-layer and pixels of the first and second pixel-layers based on the captured images;
- determining dynamically a light pattern for illumination of the object by the second pixel-layer, based on the estimated preliminary pixel correspondence;
- a second illuminating step of illuminating the object by the luminaire including displaying the dynamically determined light pattern on the second pixel-layer and displaying a predetermined light pattern on the third pixel-layer;
- capturing images of the object simultaneously illuminated by the second and third pixel-layers of the luminaire;
- refining the estimated preliminary pixel correspondence based on the captured images;
- and
- determining the depth value of a point on the surface of the object using an illumination direction from a regression fitting based on the refined pixel correspondence among the three or more spaced-apart pixel-layers.
Dependencies are inferred from the claim text.