Invalid values or complicated logic for the sliders from the application

[FlorinTulba]

Problems:

• some sliders show invalid range values
• the range of several sliders might appear unsuited for the types of controlled entities

Causes: The sliders are offered by the 'highgui' library from OpenCV. They were enough to model the user-interaction. The enumerated issues were known from the beginning and are accepted as minor drawbacks. The values of these sliders must start from 0. Last value should be at least 1.

Coping:

• ignoring invalid set values or reporting that the value was invalid
• associating special meaning to a mandatory, but invalid value

[FlorinTulba]

Unless using a different GUI-engine, this is a tolerated issue.