DB Series - Dual Bandpass

◆ MidOpt Dual Bandpass and Triple Bandpass Filters are most commonly used for security and surveillance, intelligent traffic solutions and Normalized Difference Vegetation Index (NDVI) imaging.

◆ DB395/870 Dual Bandpass Filter passes UV-Violet and infrared wavelengths, effectively blocking all green and red light. These filters have traditionally found use in NDVI-type imaging applications.

◆ When using a single camera modified for aerial agricultural surveillance, incorporation of these so-called “Superblue” or “Infrablue” filters allows reflected near-infrared light (745-970nm) to be captured in the camera sensor’s red channel and reflected violet light (375-425nm) to be captured in the sensor’s blue channel (the green channel is not used).

◆ Even when using an inexpensive consumer camera (that has first had its IR blocking filter removed), this easy separation then makes it possible to post-process the red and blue channels for NDVI by performing the calculation: NDVI = (red – blue) / (red + blue).