An active SBI circuitry will reduce the background DC component , and so the scenes ambient light greyscale information will be lost . Alternatively a similar greyscale image can also be extracted out of the acquired amplitude data (active light greyscale image), even with active SBI. Also the SBI feature can be electronically deactivated or adjusted so that it is always possible to acquire both high -quality 3D measurement and 2D greyscale information, depending on the application needs.