try countNonZero

fix a problem in JudgeChar

modify GetLicenseFromImage, add params to CharExcluders

use Mat comparison

right edge exclusion modified

adjust HSV filter

try using a right-edge crop

LicenseCropper modified, add some samples

use findContours to get the crop area

threshold adjustable in GetLicenseFromImage

an initial GetLicenseFromImage test

fix a problem in CharExcluders::ByWhitePixelUp_LeftRightRate

try using iterators

add GetLicenseFromImage func

add one 'X' excluder