Asynchronously triggered single field transfer video camera
US4896211A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1988 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Apr 26, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
As an object moves along a conveyor (A), a position sensor (B) generates a trigger signal. The trigger signal causes a strobe (14) to emit a high intensity flash of light into an examination region. A lens (20) of a CCD camera (C) focuses light from the examination region both before and during the flash on an image section (24) of a CCD array (22). Subsequent to the flash, a trigger signal delay circuit (16) causes a control circuit (D) to shift the lines of pixel values from the image section into a storage section (26), from the storage section to shift registers (32), and serially from the shift register as a video signal. A video signal channel (52) refines the video signal which is transferred to a computer system (E) which implements a preselected quality control algorithm selected in accordance with a product to be examined. The control circuit includes a pulse generator (74), which provides the appropriate clocking pulses to transfer the data among the image section, the storage section, and the shift registers. A line counter (80 ) counts the lines of pixel values transferred from the image section. When the count corresponds to one field of a video image, the counter cau…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.