Projector Calibration for Accurate Sewing Pattern Projection
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Solution Overview
Problem
Conventional sewing patterns, both paper-based and digital, are cumbersome, difficult to reuse, and obstruct the view of the fabric, making it challenging to position printed designs accurately and requiring physical cutting mats that can cause fabric movement during cutting.
Innovation Solution
A projection system that projects sewing pattern lines, notations, and instructions directly onto the material, allowing for digital storage and reuse, and uses a calibration method to ensure accurate projection without obstructing the fabric view, and includes a vertical beam system for secure projector positioning and a cutting mat underlay to prevent fabric movement during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If paper patterns are used to mark fabric, then the pattern can be physically handled and cut along, but the pattern paper covers the fabric print making it difficult to position the print in a specific location
Solution Approach 1:
The patent uses transparent or translucent pattern paper as an intermediary layer between the fabric and the user's view. This allows the pattern to be physically handled and positioned while simultaneously allowing light to pass through, making the fabric print visible beneath the pattern paper for accurate positioning.
2Manufacturing precision
If conventional cutting mats are used with rotary cutter, then cutting precision is improved, but fabric pieces can slide or move during the cutting process
Solution Approach 1:
The patent applies adhesive tape or bonding material to the cutting mat surface before placing the fabric and pattern. This preliminary action secures the fabric to the mat, preventing sliding or movement during the cutting process, while still allowing the rotary cutter to achieve precise cuts along the pattern lines.
Data Source
AI summary
A method for calibrating a projector comprises: placing a physical calibration guide within a field of projection of the projector, the physical calibration guide including first optical calibration features; projecting a calibration image by the projector onto the physical calibration guide, the calibration image including second optical calibration features; acquiring with a computing device an image including the first and second optical calibration features; determining a camera transform from the first optical calibration features in the camera image; applying an inverse transform of the camera transform to the second optical calibration features in the camera image to obtain inverse second optical calibration features; and determining a projector transform from the inverse second optical calibration features; wherein the steps of determining a camera transform, applying an inverse transform, and determining a projector transform are performed by the computing device by executing instructions stored thereon.