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Method and system for monitoring driver

  • US 8,587,440 B2
  • Filed: 02/11/2010
  • Issued: 11/19/2013
  • Est. Priority Date: 09/22/2009
  • Status: Active Grant
First Claim
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1. A method for monitoring a driver comprising steps of:

  • Step (A);

    capturing an inner cabin image of a cabin;

    Step (B);

    performing a face detection of the driver on said inner cabin image to obtain a face detection result;

    Step (C);

    storing said inner cabin image and said face detection result corresponding to said inner cabin image;

    Step (D);

    repeating said above-mentioned steps, and when an accumulated number of stored said inner cabin images reaches a predetermined value, executing steps of;

    Step (E);

    capturing said inner cabin images at a plurality of adjacent storing time points and corresponding said face detection results thereof;

    Step (F);

    determining whether at least one corresponding said inner cabin image catches a face of said driver according to each captured said face detection result;

    if no, outputting a warning signal to alert said driver; and

    if yes, executing a step of;

    Step (G);

    determining whether said faces of two continuous and corresponding said inner cabin images are shown within a reasonable face region according to each captured said face detection result to define a face region correction process;

    said face region correction process including taking a positional coordinate of the face, taking said positional coordinate having a highest existing probability, and deciding a position of said reasonable face region; and

    ,(1) if said faces of two continuous and corresponding said inner cabin images are within said reasonable face region, then performing a nose detection of said driver on presently-stored said inner cabin image;

    obtaining a positional coordinate of a nose of said driver;

    comparing said positional coordinate of said nose with said reasonable face region to obtain a head deflection angle of said driver to define a nose detection process;

    determining whether said head deflection angle is lower than a predetermined threshold, and returning to said Step (E); and

    (2) if said faces of two continuous and corresponding said inner cabin images are not within said reasonable face region, then outputting said warning signal to alert said driver.

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