Browse Prior Art Database

Mask for High Speed Image Processing

IP.com Disclosure Number: IPCOM000112640D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Ito, M: AUTHOR [+2]

Abstract

This is a new mask shape design for an automated high speed image process of disk surface inspection. This new mask is designed to reduce inspection time by the obvious recognition of the mask start or end position.

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Mask for High Speed Image Processing

      This is a new mask shape design for an automated high speed
image process of disk surface inspection.  This new mask is designed
to reduce inspection time by the obvious recognition of the mask
start or end position.

      To realize a high speed image process for surface inspection,
first damage candidates are selected by comparing the image
brightness level with the predefined threshold (Fig. 1).

To inspect the whole surface, it will be divided into some tracks and
sectors (Fig. 2).

      The image data of each sector is processed through camera
scanning line by line, but the image data of the inner sector or
outer sector contains area outside the disk surface which appears at
the left or right side of the inner edge or outer edge (Fig. 3).  The
brightness level of image data of this outside area is black and it
becomes a damage candidate, but this candidate does not indicate real
damage.

      The new mask has straight edges at its left and right sides,
and then the X-position of the scanned mask start or end has always
the same coordinates.  It is easy to identify and remove the fake
damage candidates, since they always start or end the mask (Fig. 4).