Patent ID: 8014601

Claim:
A pattern recognizing apparatus comprising: a storing section configured to store a reference image being binarized and having a high density region and a low density region and an input grayscale image to be matched with the reference image; a first accumulated histogram extracting section configured to extract a first accumulated histogram generated by accumulating pixels whose density value is less than a given value among pixels of the input grayscale image and corresponding to the high density region of the reference image; a second accumulated histogram extracting section configured to extract a second accumulated histogram generated by accumulating pixels whose density value is more than a given value among pixels of the input grayscale image and corresponding to the low density region of the reference image; an accumulated histogram summating section configured to generate a summated accumulated histogram by summating the first accumulated histogram and the second accumulated histogram; and a pattern matching section configured to recognize the input grayscale image by using a distance value of the reference image and the input grayscale image which is a minimum value of the summated histogram generated by the accumulated histogram summating section.