Method for positioning sub-pixel centers of light spots based on pixel movement and cutting
US11636620B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2021 |
| Grant date | Apr 25, 2023 |
| Priority date | — |
| Expiry date | Jan 13, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A spot sub-pixel center positioning method based on pixel movement and cutting, the method includes driving the CCD image plane to move along the x direction and the y direction through a displacement platform, selecting target pixels to move and cut the spot, and recording the gray value change of the target pixels, constructing the mapping relationship between gray value and displacement, performing differential transformation on the gray value and displacement curve, and finally performing interpolation fitting to obtain the sub-pixel coordinate value of the center point of the light spot. The measurement accuracy can be maintained within ½ of the single-step displacement of cutting. The method is not only suitable for strong and weak distribution of light spots, but also for fully saturated light spots, and also for asymmetrically distributed and blurred edges. It also has a good measurement effect and can handle a variety of spot scenes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.