A method and circuit for performing Correlated Double Sub-Sampling of pixels in an active pixel sensor array. Each bin stores a particular variety of packaged multiple-dose pharmaceutical. A selection of task objects from a collection of task objects is received, which are needed to implement the underlying functionality of a GUI object. Further, the method includes sending from the processing device at least one control signal to the at least one cell-site configured to cause the at least one cell-site to take the at least one further action. The camera also includes an attribute setting unit for setting a read only attribute for a data file that is already recorded by the storage medium at a time when the switch unit starts the supply of power.