Collects and stores video from cameras and provides interface for viewing and recording. Can be software component of NVR or DVR, offering more features than packaged devices. Modern cameras often have built-in web interface without VMS requirement
Accelerometer measures proper acceleration relative to free fall. Earth's surface accelerometer shows about 1g acceleration. Free fall accelerometer shows zero acceleration
2.8mm CMOS sensor with 1944x1224 effective pixels. Maximum resolution of 1080p on computer, 720p on mobile. Wi-Fi 802.11 a/b/g/n with dual-band support. Maximum power consumption of 11W
Touch screen uses sensors, controllers, and software to detect finger movements. Sensors convert voltage changes into signals for computer processing. Resistive and capacitive technologies are most common types
Dogs have two types of cones, enabling blue-yellow vision but not red-green. Their brains interpret cone signals similarly to people with colorblindness. Dogs may use darker objects as cues to distinguish red from green. Dogs' lenses transmit ultraviolet light, suggesting blue vision
Dogs have visual acuity of 20/75, seeing at 20 feet as clearly as humans at 75 feet. Dogs have dichromatic vision, seeing only yellow and blue colors. Dogs' retina contains 3% cones versus 5% in humans. Dogs cannot differentiate between red and green colors