Image data processing method and image data processing apparatus

Details Image data processing method and image data processing apparatus Image data processing method and image data processing apparatus

1997-06-06

1999-03-09

Rogers, Scott

Image analysis

Applications

Manufacturing or product inspection

382190, 382263, 382266, 349187, G06K 946, G06K 954, G06T 500

Patent

active

058811648

ABSTRACT:
An image data processing method by which stripped brightness non-uniformities of a very low contrast can be detected accurately from an input multiple-valued digital image data. The method includes (1) the first step of producing a first emphasis image data from the input image data by first line segment emphasis filtering processing for emphasis of line segments at least of a predetermined direction and producing a binary image data from the first emphasis image data by first threshold value processing, and (2) the second step of producing a second emphasis image data from the binary image data by second line segment emphasis filtering processing for emphasis of line segments of the predetermined direction and extracting the line segments of the predetermined direction from the second emphasis image data by second threshold value processing. Through the method, the line segments of the predetermined direction arranged in a juxtaposed relationship from each other are selectively detected. The method can be applied to, for example, detecting rubbing stripes of an LCD (liquid crystal display) panel.

REFERENCES:
patent: 5081687 (1992-01-01), Henley et al.
patent: 5339093 (1994-08-01), Kumagai et al.
patent: 5394481 (1995-02-01), Kumagai et al.
patent: 5754678 (1998-05-01), Hawthorne et al.

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