3D Recording Exposure Time Determination Using Masked Greyscale Analysis
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Solution Overview
Problem
Existing methods for determining 3D coordinates of objects require multiple recordings and struggle to separate the object from the background effectively, leading to inefficient exposure time calculation and potential image artifacts.
Innovation Solution
A method that projects a stripe pattern onto an object, records the reflected light, and calculates the exposure time using a single recording by determining the mean greyscale value within the measurement volume, allowing for real-time adaptation of exposure parameters such as camera stop, sensitivity, and intensity, while using a mask image to distinguish between object and background regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple recordings are used to determine exposure, then measurement accuracy may be improved, but device complexity and time consumption increase
Solution Approach 1:
The patent extracts only the necessary information (mean greyscale value) from the recording within the measurement volume to determine exposure, rather than requiring multiple complete recordings. This allows exposure calculation using a single recording while maintaining accuracy.
Solution Approach 2:
The patent segments the recording into regions within and outside the measurement volume, using a mask image to distinguish between them. Only the mean greyscale value within the measurement volume is used for exposure determination, effectively separating relevant from irrelevant data.
2Measurement precision
If multiple recordings are used to separate object from background, then measurement precision improves, but loss of time increases
Solution Approach 1:
The patent performs preliminary action by creating a mask image that pre-identifies regions within and outside the measurement volume before exposure determination. This allows immediate separation of object and background regions in the single recording without requiring multiple sequential recordings.
Solution Approach 2:
The patent extracts only the mean greyscale value from regions within the measurement volume using the mask image, ignoring background regions. This selective extraction enables rapid exposure determination without processing entire multiple recordings.
3Productivity
If exposure is determined from mean greyscale value within measurement volume, then productivity increases, but measurement precision may worsen
Solution Approach 1:
The patent applies local quality by focusing the exposure determination on the specific local region within the measurement volume where the object is located. The mask image ensures that only the local region's mean greyscale value is used, not the entire recording, maintaining relevance to the actual measurement area.
Solution Approach 2:
The mask image acts as an intermediary that mediates between the recording and the exposure determination process. It selects and weights the mean greyscale value from appropriate regions, ensuring that the simplified single-recording approach still yields accurate exposure calculations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient determination of exposure time for 3D coordinate calculation using a single recording, effectively separates the object from the background, and allows for real-time adjustments, reducing image artifacts and improving measurement accuracy.
Implementation Method 1
a camera for recording the light reflected by the object
Data Source
AI summary
A method for determining an exposure, in particular an exposure time, for a recording in a method for determining the 3D coordinates of an object is provided, in which a pattern is projected onto the object and the light reflected by the object is recorded. To improve such a method, a recording of the object is produced with a predetermined exposure, in particular exposure time. A mask image of this recording is produced, in which mask image the regions of the object lying within the measurement volume are depicted. The exposure, in particular the exposure time, for the recording is determined depending on the predetermined exposure, in particular exposure time, depending on the mean greyscale value in the regions, lying within the measurement volume, of the recording with a predetermined exposure and depending on an ideal greyscale value.