80S-2080F480F4-680F5 User’s Manual - 第282页

SIPLACE 80S-20/F4/F4-6/F5 User’s Manual 5 Vision Functi on s Edition 03/98 from S oftware Version SR.404.xx 5.5 Teach Fiducial Line engi neer 5 - 61 To make i t easi er for you to asses s the ra nge of br ightness or the…

5 Vision Functions SIPLACE 80S-20/F4/F4-6/F5 User’s Manual

5.5 Teach Fiducial Edition 03/98 from Software Version SR.404.xx

5 - 60 Line engineer

5.5.5

Contrast Sensitivity

The Contrast sensitivity menu provides options for optimizing the contrast between the fiducial and its sur-

roundings.

NOTE

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 selected the Program transform 5 option.

Fig. 5.5.13 Contrast sensitivity menu, options

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

ues is as follows:

0 = black and

255 = white

SIPLACE 80S-20/F4/F4-6/F5 User’s Manual 5 Vision Functions

Edition 03/98 from Software Version SR.404.xx 5.5 Teach Fiducial

Line engineer 5 - 61

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:

NOTE

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.

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

tables in order to obtain a color image which is capable of supplying the necessary information. In addition,

you can also program a transformation table yourself.

NOTE

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

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. 5.5.1 Gray-scale to color conversion table

5 Vision Functions SIPLACE 80S-20/F4/F4-6/F5 User’s Manual

5.5 Teach Fiducial Edition 03/98 from Software Version SR.404.xx

5 - 62 Line engineer

5.5.5.1

Transforms 1 to 5

Option

When you select this options,

– 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 displayed.

Fig. 5.5.14 Contrast sensitivity menu, Transforms 1-5 video image

Press Esc to quit this option.

Fiducial No. = 8 Uniqueness = 70

Disp. with transform 2