System and method for detecting blemishes on image sensor package
US8073236B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 28, 2007 |
| Grant date | Dec 6, 2011 |
| Priority date | — |
| Expiry date | Oct 5, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/8887
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for detecting blemishes on an image sensor package includes an initialization module configured for initializing a suspected blemish standard mean value range and a blemish standard deviation value; an image capturing module configured for capturing an image produced by the image sensor package and acquiring a brightness value of each of pixels of the image; a calculation module configured for calculating a mean value and a standard deviation of differences of brightness values of a pixel and any other pixels surrounding the pixel; a comparison module configured for respectively comparing the mean value and the standard deviation with the suspected blemish standard mean value range and the blemish standard deviation value; and a marking module configured for marking the suspected blemish which is inside the suspected blemish standard mean value range and the blemish which is larger than the blemish standard deviation value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.