Stripe projection system
AssigneeCarl Zeiss Industrielle Messtechnik GmbH
InventorChristian Schleith
Life of this patent
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Abstract
A stripe projection system for three-dimensionally capturing the surface of a measurement object includes a projector configured to project a stripe pattern onto the measurement object and a digital camera for capturing the stripe pattern. The projector includes a binary amplitude mask having transparent and opaque regions. The amplitude mask has first stripe regions which extend in a first direction and in which the proportion of the opaque and of the transparent area proportions varies depending on a position in a second direction. In this case, it is provided that the first stripe regions each form a transition region between continuous opaque or transparent stripes extending in the first direction and alternate with these stripes in the second direction.
Claims20
A stripe projection system for three-dimensionally capturing a surface of a measurement object, the stripe projection system comprising:
- a projector configured to project a stripe pattern onto the measurement object;
- and
- a digital camera configured to capture the stripe pattern,
- wherein the projector includes a binary amplitude mask having transparent and opaque regions,
- wherein the amplitude mask has first stripe regions which extend in a first direction and in which a proportion of the opaque and of transparent area proportions varies depending on a position in a second direction,
- wherein the proportion of the opaque and of transparent area proportions increases or decreases continuously over an extension of the respective first region in the second direction taking into account a resolution of the projection and camera optical units,
- wherein the first stripe regions each form a transition region between continuous opaque or transparent stripes extending in the first direction and alternate with these stripes in the second direction,
- wherein a width of the continuous opaque or transparent stripes in the second direction in an image captured by the digital camera substantially corresponds to the width of a pixel of the digital camera, and/or
- wherein the width of the continuous opaque or transparent stripes in the second direction is approximately 1/m of a period length of the stripe pattern, and
- wherein m is a number of pixels of the digital camera which capture a period of a projected intensity pattern in the second direction.
A stripe projection system for three-dimensionally capturing a surface of a measurement object, the stripe projection system comprising:
- a projector configured to project a stripe pattern onto the measurement object;
- and
- a digital camera configured to capture the stripe pattern,
- wherein the projector includes a binary amplitude mask having transparent and opaque regions,
- wherein the amplitude mask has first stripe regions which extend in a first direction and in which a proportion of the opaque and of transparent area proportions varies depending on a position in a second direction,
- wherein the proportion of the opaque and of transparent area proportions increases or decreases continuously over an extension of the respective first region in the second direction taking into account a resolution of the projection and camera optical units,
- wherein the first stripe regions each form a transition region between continuous opaque or transparent stripes extending in the first direction and alternate with these stripes in the second direction, and
- wherein as a result of a division of the stripe pattern into continuous opaque and transparent stripes and intervening transition regions together with a sampling rate of the digital camera and a resolution capability of the projection and camera optical units, locally a desired periodic intensity distribution is generated on a camera image with the maximum possible contrast.
A stripe projection system for three-dimensionally capturing a surface of a measurement object, the stripe projection system comprising:
- a projector configured to project a stripe pattern onto the measurement object;
- and
- a digital camera configured to capture the stripe pattern,
- wherein the projector includes a binary amplitude mask having transparent and opaque regions,
- wherein the amplitude mask has first stripe regions which extend in a first direction and in which a proportion of the opaque and of transparent area proportions varies depending on a position in a second direction,
- wherein the proportion of the opaque and of transparent area proportions increases or decreases continuously over an extension of the respective first region in the second direction taking into account a resolution of the projection and camera optical units,
- wherein the first stripe regions each form a transition region between continuous opaque or transparent stripes extending in the first direction and alternate with these stripes in the second direction,
- wherein the binary amplitude mask is structured periodically or quasi-periodically in the first and the second direction by juxtaposition of basic cells,
- wherein the structure period in the first direction along the stripes of the stripe pattern is smaller than the resolution of the projection and camera optical units,
- wherein the basic cells are partly opaque and partly transparent over their height in the first direction in the first stripe region, and
- wherein the respective proportion varies depending on the position in the second direction.
Dependencies are inferred from the claim text.