A digital image processing method is taught for detecting human irises in a digital
image. The method comprises the steps measuring the red intensity of the pixels
in the image, determining the probability that each pixel is an iris based upon
the red intensity of the pixel, determining the probability that each pixel is
not an iris based upon the red intensity of the pixel; and determining whether
the pixel is an iris by analyzing the relationship between the probability that
the pixel is an iris and the probability that the pixel is not an iris. In one
embodiment of the present invention, the determination as to whether a pixel is
an iris pixel is then made based upon the application of a Bayes model to the probability
that the pixel is not an iris, the probability of the occurrence of an iris in
the identified region and probability of the occurrence of a non-iris pixel in
the identified region. In another embodiment of the present invention, the method
comprises the steps of finding an oval shaped skin color region, detecting iris
color pixels in the oval shaped skin color region, detecting iris color pixels
in the oval shaped region using a Bayes model and locating eye positions based
upon the detected iris color pixels.
A computer program product for performing these methods is also taught.
