How does EyeFINE auto focus?

Passive auto focus systems respond to the brightness and contrast of the object viewed responding to the ambient light the subject is reflecting.? Two photodiode line sensors located at right and left are used to analyze the image, and focus the lenses by computing parallax, the difference between the signals from the two photodiode line sensors. The photodiodes send a signal to the microprocessor in eyeFINE which analyzes the data and focus the lenses

 Triangulation, three points measuring system, is performed using the two sets of photodiode line sensors, which are photodiode arrays with lined small photodiodes.

When eyeFINE focuses on a solid color wall, which does not have enough contrast  thus no difference can be detected between two line sensors, eyeFINE projects a vertical striped target chart on the object with an infrared light, and using that projected chart the two line sensors measure t he distance to focus lenses properly.? The line sensors can detect the infrared light, which is invisible to human eyes.

 When visibility is low in darkness, eyeFINE also applies the same method as above.

 When eyeFINE tries to focus through a window, it decides which to focus; the light reflected off the window or the object outside the window, depending on the intensity of brightness and contrast.? In most cases it focuses on higher brightness and clearer contrast.?

 

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