Assignment

 

There exists, for all senses a lower limit below which nothing can be perceived. This being expressed as the threshold of vision, the threshold of taste and so on. Here are some thresholds for the five human senses:

 

         Hearing --> the tick of a watch in quiet conditions at 20 feet

         Vision --> the flame of a single candle at 30 miles distance on a dark night .

         Smell --> one drop of perfume in a 6 room appartment .

         Taste --> one teaspoon of sugar in 2 gallons of water

         Touch --> the wing of a fly falling on cheek from 1 cm.

 

Find out human sense JNDs for the following parameters of a WIMP interface.

         a) Line thickness

        b) Area of square

        c) Document zoom control

        d) Visual indication on progress bar