Researchers have developed the world's first self-powered video camera that runs without a battery. The camera can produce one image per second in a well lit space.
Computer scientist Shree K Nayar from the Columbia University designed a pixel that can measure incident light and can convert it into electric power. The key enabling device in a pixel is the photodiode which produces an electric current when exposed to light. The mechanism allows each pixel to measure the intensity of light that falls on it. Through each image capture cycle, the pixels first record, read out the image and then harvest the energy and charge the sensor's power supply. The image sensor continuously toggles between image capture and power harvesting modes.