Motion-compensated compression of 30 animation models

range (six decades), the power consumption will be 71 mW. Normal operation produces events at a maximum of 4MHz, for a dynamic range of five decades, while consuming 10mW. A full VGA with three decades of dynamic range operates at 2.46MHz and consumes only 1.3mW. Fig. 4 shows how the output rate per pixel, dynamic range, power and array size scales. The main drawback to this approach is the complexity of the digital frame grabber required (pixel size, fmed pattern noise and power consumption can be reduced with better circuit designs). To make every spike count, a high-resolution timer (= 24 bits) and a large frame buffer are required (= 15 MB for VGA). The timer indexes each event and compares it with the last time an event at that pixel was recorded. The difference is inversely proportional to the light intensity. The buffer must hold the latest pixel time index and the intensity value. Fig. 5 shows example images recorded with the array. Note that features in the shadows can be seen using a log plot.