Sampled differential analyzer
US3987241A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1974 |
| Grant date | Oct 19, 1976 |
| Priority date | — |
| Expiry date | Oct 17, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for evaluating members or a family of similar devices by comparing images of a model device to the image of the member to be evaluated is disclosed. An image of the model device is first produced and stored in a memory. An image of the member to be evaluated is produced as the stored image of the model device is simultaneously reproduced. The images of the model and the member being evaluated are compared to generate a comparison signal related to the differences therebetween. The comparison signal is sampled at a predetermined rate, to produce a digital signal indicating sample points where the comparison signal exceeds a predetermined value. Statistical techniques are used to analyze the digital signal to determine which portions of this signal correspond to significant differences between the images of the model device and the member being evaluated. The portions of the digital signals corresponding to significant differences between images of the model and device being evaluated are combined with the image of the device being evaluated to produce a multicolor composite image. In the composite image areas of the image of the device being evaluated which are significantl…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.