Browse Prior Art Database

Method to Improve Efficiency of Image Processing for Device Testing

IP.com Disclosure Number: IPCOM000121538D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Nakano, H: AUTHOR

Abstract

This article describes an apparatus and a method to improve the efficiency of image processing for device testing. The time required to capture a plurality of images with different light sources can be minimized by overlapping the lighting and image-capturing operations.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 72% of the total text.

Method to Improve Efficiency of Image Processing for Device Testing

      This article describes an apparatus and a method to
improve the efficiency of image processing for device testing.  The
time required to capture a plurality of images with different light
sources can be minimized by overlapping the lighting and
image-capturing operations.

      In the figure, the device to be tested is checked from
different directions with three CCD cameras 1, 2, and 3.  In this
example, it is assumed that the cameras are sequentially operated to
capture three different images of the device with an associated light
source being turned on synchronously.  The camera requires 32 ms to
output the entire image, 16 ms for odd scan lines and 16 ms for even
scan lines.  The purpose of this apparatus is to minimize the
required time to capture images with different lighting sources and
to maximize the efficiency of image processing by improving
parallelism.

      The process is performed in the following sequence:
   1) Turn on light source 1.
   2) Wait 16 ms which is required for camera 1 to output odd scan
lines.
   3) Start processor 1 to capture the image of camera 1. Processor 1
needs 32 ms to capture the entire image of camera 1.
   4) 16 ms after processor 1 starts to capture image, switch
llghting to light source 2.
   5) Start image processor 2 to capture image of camera 2 just after
processor 1 finishes image capturing, and start image processing by
proc...