SIPLACE S-23 HM.pdf - 第226页

6 Vision functions User M anual SIPLACE S -23 HM 6.5 Teach Fiducial Software Version SR.406.xx 02/00 US E dition 226 T o mak e it easier for you to assess the r ange of brightn ess or th e contras t, these gr ay-scale va…

User Manual SIPLACE S-23 HM 6 Vision functions

Software Version SR.406.xx 02/00 US Edition 6.5 Teach Fiducial

225

6.5.5 Contrast Sensitivity Menu

The Contrast sensitivity menu provides options for optimizing the contrast between the fiducial

and its surroundings. 6

NOTE 6

All of the options in this menu are only accessible if you have loaded a fiducial beforehand. If you

have done so, this will be indicated by the text on the button being black (rather than grayed out).

The fiducial number and fiducial name are displayed in the Fiducial display field.

If you have not loaded a fiducial you will only be able to select the Program transform 5 option. 6

Fig. 6.5 - 17 Contrast sensitivity menu, options

Each pixel of the video camera contains one unit of 8-bit gray-scale information. The significance

of the values is as follows: 6

0 = black and

255 = white

6 Vision functions User Manual SIPLACE S-23 HM

6.5 Teach Fiducial Software Version SR.406.xx 02/00 US Edition

226

To make it easier for you to assess the range of brightness or the contrast, these gray-scale values

have been converted with the help of transformation tables into color as is shown below: 6

NOTE 6

In order to achieve a good uniqueness value the contrast difference between the fiducial and its

surroundings should be at least 75. For example, if the background is green the fiducial should be

orange. 6

If the contrast is unsatisfactory you can select in the menu between five pre-programmed trans-

formation tables in order to obtain a color image which is capable of supplying the necessary in-

formation. In addition, you can also program a transformation table yourself. 6

NOTE 6

When the color presentation is changed the fiducial will be taught at the same time. 6

Gray scale Allocated color

0black

30 violet

50 blue

77 blue-green

100 green

127 brown

150 red

175 orange

200 yellow

255 white

Tab. 6.5.1

User Manual SIPLACE S-23 HM 6 Vision functions

Software Version SR.406.xx 02/00 US Edition 6.5 Teach Fiducial

227

6.5.5.1 Transforms 1 to 5 Option

When you select this options, 6

– the menu closes,

– the video image is displayed,

– the teach command is given, and

– header and footer with color table option, fiducial number and the uniqueness value are dis-

played.

Fig. 6.5 - 18 Contrast sensitivity menu, Transforms 1-5 video image

Å Press Esc to quit this option.

Fiducial No. = 8 Uniqueness = 70

Disp. with transform 2