Related Experiment Videos
Dimensional measurements on images from a video camera or cassette recorder using a BBC microcomputer
R M Aspden1, B D Gleave, D W Hukins
1Department of Medical Biophysics, University of Manchester, UK.
Journal of Biomedical Engineering
|May 1, 1988
Summary
This study presents a novel system for precise dimensional measurements using a BBC microcomputer and standard video sources. The technology allows accurate image analysis without requiring a dedicated framestore, achieving 0.4% precision.
Area of Science:
- Computer Vision
- Image Processing
- Measurement Systems
Background:
- Traditional image-based dimensional measurement systems often require specialized hardware like framestores.
- Integrating video input with microcomputers for direct measurement presents technical challenges.
Purpose of the Study:
- To develop a cost-effective system for dimensional measurements from video images using a BBC microcomputer.
- To enable direct measurement capabilities without the need for a framestore.
Main Methods:
- A system was developed synchronizing the RGB output of a BBC microcomputer with video input (camera or recorder).
- The synchronized output was displayed on a single monitor, allowing direct on-screen measurement.
- Measurements were performed using the computer's graphics cursor controlled via keyboard input.
Main Results:
- The system enables dimensional measurements directly from displayed video images.
- Distances can be measured with a precision of approximately 0.4%.
- The system is versatile, particularly effective for analyzing freeze-frame video from standard videotapes.
Conclusions:
- The developed system offers a versatile and precise method for dimensional image analysis.
- It provides a practical solution for measurement tasks without requiring expensive framestore hardware.
- The system is especially beneficial for applications involving freeze-frame video analysis.