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Image-qualification-for-optical-navigation-sensor

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Image qualification for optical navigation sensor

Details

Inventors: Lin, Chun-Huang;
Assignee: PixArt Imaging Inc. (Hsin-Chu, TW)
Primary Examiner: Ahmed; Samir
Assistant Examiner: Mistry; O'Neal R.
Attorney, Agent or Firm: Tung & Associates

An image qualification method. A movements-determining method utilizes the image qualification, the image qualification method of which requires only an image frame to determine if the image frame is qualified. Thus, the image qualification proceeds in real time. The image qualification counts peaks of images of the frame to determine if a number of the peaks exceed a certain number, depending on application.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide an image qualification in real time for an optical navigation sensor.
To achieve the above objects, the present invention provides an image qualification method, requiring only one image frame.
The image qualification in the present invention includes the following steps.
A pixel in one dimension of a frame is determined to be an upper peak of brightness when pixels on two sides of the dimension have less brightness than the pixel.
A pixel in one dimension of the frame is determined to be a down peak of brightness when pixels on two sides of the dimension have more brightness than the pixel.
A pixel at an edge of one dimension of the frame is determined not to be an upper peak even when the pixel has a maximum brightness.
A pixel at an edge of one dimension of the frame is determined not to be a down peak even when the pixel has a minimum brightness.
The frame is determined to be a good or bad frame based on the number of the peaks satisfying requirements.

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