Method and Device for Three-Dimensional Surface Detection with a Dynamic Reference Frame

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This invention describes a method and device for capturing the three-dimensional (3D) surface of an object using an optical sensor. The system projects light patterns onto an object and captures images as either the sensor or object moves freely. By analyzing and registering these overlapping images, the system creates a complete 3D model in real time without needing to track the sensor's position. The method is robust to movement, allowing for 'on-the-fly' acquisition of detailed surface data, making it suitable for use cases where traditional 3D sensors requiring strict stillness are impractical.

Use CasesContent extracted from patent full text and abstract with AI.

• Intraoral dental scanning for digital impressions
• Full-body or body part scanning in medicine and prosthetics
• Industrial inspection and quality control of manufactured components
• Crime scene and forensic documentation
• Architectural or interior space 3D modeling
• Digitizing cultural heritage objects or artwork
• Scanning objects on a production conveyor belt
• Robotic or automated surface inspection
• Custom-fit product design (e.g., footwear, helmets)

BenefitsContent extracted from patent full text and abstract with AI.

• Enables fast, real-time 3D scanning without needing to keep the sensor or object stationary
• Can be used in handheld or automated modes, increasing flexibility
• Does not require external tracking systems, reducing complexity and cost
• Suitable for scanning complex objects from multiple angles and in hard-to-reach areas
• Allows immediate visualization of the scanned area, so missing parts can be quickly identified and rescanned
• Scalable to both small (e.g., dental) and large (e.g., cars, rooms) objects
• Produces detailed and accurate 3D models through robust registration algorithms
• Low-cost and miniaturizable design due to simple hardware requirements
• Adaptable exposure and projection settings for various motion speeds and environments

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Patent Abstract

The surface shape of a three-dimensional object is acquired with an optical sensor. The sensor, which has a projection device and a camera, is configured to generate three-dimensional data from a single exposure, and the sensor is moved relative to the three-dimensional object, or vice versa. A pattern is projected onto the three-dimensional object and a sequence of overlapping images of the projected pattern is recorded with the camera. A sequence of 3D data sets is determined from the recorded images and a registration is effected between subsequently obtained 3D data sets. This enables the sensor to be moved freely about the object, or vice versa, without tracking their relative position, and to determine a surface shape of the three-dimensional object on the fly.