this question relates to the design of interactive augmented reality applications.

Consider a future application in which a (static) public billboard is augmented so that people passing in the street can see and modify and enhance view ,for example adding and editing caption text or speach bubbles over thier personalizedBilboard.This augmented functionality will be available either using hand held devices such as touch screen phone or head-munted displays such as Microsoft hololens,whichever type of device is used. User should be able able to control applications either using hand gesture or gaze control.

a) discus the requirements for sensor configuration and computer vision processing to achieve the necessary detection detection and registration of the augmented reality interaction in in each of the four possible combinations of the display and and control methods described above.

b)this part only relates to the head mounted display version of propose product.