3D Measurement Apparatus Adaptive Cropping for Speed
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Solution Overview
Problem
Conventional three-dimensional measurement apparatuses face challenges in adapting to varying object positions on a production line, particularly with partial cropping functions in digital cameras, which hinder the reduction of image processing time and data volume.
Innovation Solution
A three-dimensional measurement apparatus comprising a first camera, a second camera, and a control unit that calculates three-dimensional coordinates and sets a cropping range for the second camera based on the projection of the first camera's image, enabling efficient image processing by reducing the amount of information to be transferred and processed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If partial cropping function is used to reduce data volume and speed up image processing, then image processing speed is improved, but the function cannot be adapted when objects vary in position on the production line
Solution Approach 1:
The patent applies preliminary action by calculating the cropping range for the second camera based on the first camera's image data before the second camera captures the image. This pre-calculation of the region of interest allows the system to preset the reading pixel range on the image sensor, enabling the partial cropping function to be effectively utilized while adapting to varying object positions.
Solution Approach 2:
The patent implements dynamics by making the cropping range adaptive rather than fixed. The cropping range is dynamically determined based on the detected object position in the first camera's image and the relative positional relationship between the two cameras. This allows the system to adjust the cropping range according to varying object positions while maintaining high-speed image processing.
2Measurement precision
If cropping range is set after acquiring both images, then similar portion can be identified, but the time of transferring images from the camera cannot be reduced
Solution Approach 1:
The patent applies preliminary action by determining the cropping range of the second camera based on the first camera's image data before the second camera acquires the image. This pre-determination allows the system to reduce the amount of image data that needs to be transferred from the second camera, thereby reducing image transfer time while still ensuring accurate identification of the similar portion through subsequent stereo matching.
3Loss of information
If all pixels are read on the image sensor, then complete image data is acquired, but data volume is large and processing is slow
Solution Approach 1:
The patent applies the extraction principle by reading only the necessary pixels within the calculated cropping range on the image sensor of the second camera, rather than reading all pixels. This selective reading of pixels reduces the data volume significantly while still capturing the region of interest that contains the object information needed for three-dimensional measurement, thereby improving image processing efficiency.
Data Source
AI summary
There are provided a three-dimensional measurement apparatus capable of speeding up image processing, and a robot system including the same.