Please help me in calculating area of irregular objects or images (shapes) Urgent.

I have designed area measurement system using simple FPGA(Arduino IDE C code and Papilio loader) matlab code (like rgb to grayscale conversion, segmentation etc.) and area calibration with other known (area) object. But it is very simple method. I need some complex method. Please suggest me other area measurement methods using matlab and xilinx system generator or other complex method.