Pixel Selection

As explained in event-based concepts page, each pixel of the sensor individually detects relative changes of light and encodes this information into events. In some situations, it might be useful to disable certain pixels in the array. This can be done by deactivating individual pixels, preventing them from performing any detection, using a feature called Region of Interest (ROI). Alternatively, the sensor’s pipeline also offers the Digital Event Mask and Digital Crop features for more pixel selection

While these three features ensure that events are excluded from the EVK output (through the USB link), the main difference between them lies in their operation. The ROI feature prevents any pixels from being sent to the rest of the “digital sensor pipeline” (Digital Block), where the Digital Event Mask and Digital Crop functions operate. In other words, events masked by the Digital Event Mask or Digital Crop will still exist in the “Analog Block”.

Therefore, to minimize readout congestion and reduce dynamic current consumption, the ROI feature should be favored whenever possible.

Those three facilities are presented in the following sections:

• Region of Interest
• Digital Event Mask
• Digital Crop