Method for identification of contamination upon a lens of a stereoscopic camera
AssigneeKapsch TrafficCom AG
InventorBjörn Crona
Life of this patent
Estimating the term…
Abstract
A method for identifying contamination upon a lens of a stereoscopic camera is disclosed. The stereoscopic camera is arranged such that it has the same capturing area over time, and is provided with a first camera providing first images of said capturing area and a second camera providing second images of said capturing area. The first and second images are divided into at least one evaluation area correspondently located in respective image. A traffic surveillance system is also disclosed where contamination upon a lens of a stereoscopic camera is identified according to said method.
Claims15
A method for identifying contamination upon a lens of a stereoscopic camera, wherein said stereoscopic camera
- is arranged such that a capturing area of said stereoscopic camera is predefined such that images from said stereoscopic camera have the same capturing area over time,
- is provided with a first camera adapted to cover said capturing area by providing first images of said capturing area, and
- is provided with a second camera adapted to cover said capturing area by providing second images of said capturing area, wherein
- said first images are divided into at least one evaluation area and said second images are divided into at least one evaluation area, wherein the respective evaluation area of said first and said second images are correspondently located in respective image, wherein said method comprises the steps of:
- forming historical image data for said evaluation areas, wherein said historical image data comprises an image parameter representing the respective evaluation area from a predetermined number of previously captured first and second images,
- comparing said historical image data for the evaluation area of said first image with historical image data for the evaluation area of said second image, and
- indicating that at least one lens of said stereoscopic camera is contaminated, if a deviation larger than a threshold value between the compared historical image data is identified.
A traffic surveillance facility, comprising:
- a stereoscopic camera, wherein said stereoscopic camera
- is arranged such that a capturing area of said stereoscopic camera is predefined such that images from said stereoscopic camera have the same capturing area over time,
- is provided with a first camera adapted to cover said capturing area by providing first images of said capturing area, and
- is provided with a second camera adapted to cover said capturing area by providing second images of said capturing area, wherein
- said first images are divided into at least one evaluation area and said second images are divided into at least one evaluation area, wherein the respective evaluation area of said first and said second images are correspondently located in respective image;
- and
- an electronic control unit provided to:
- control said stereoscopic camera;
- and
- perform an identification of contamination upon a lens of the stereoscopic camera, the electronic control unit configured to:
- form historical image data for said evaluation areas, wherein said historical image data comprises an image parameter representing the respective evaluation area from a predetermined number of previously captured first and second images,
- compare said historical image data for the evaluation area of said first image with historical image data for the evaluation area of said second image, and
- indicate that at least one lens of said stereoscopic camera is contaminated, if a deviation larger than a threshold value between the compared historical image data is identified.
Dependencies are inferred from the claim text.