The Indian-origin scientist have developed the world’s first self-powered video camera that runs without a battery. The self-powered video camera has been invented by a Computer scientist Shree K.Nayar from the Columbia University, which can produce one image per second in a well lit indoor scene.
Scientist Shree Nayar designed a pixel that not only can measure incident light (a ray of light that strikes a surface) but it can also convert the incident light into electric power. The key enabling device in a pixel is a photodiode that produces an electric current when exposed to light. The mechanism allows each pixel to measure the intensity of light that falls on it.
During every image capture cycle, the pixels are used first to record and read out the image and then to harvest power energy and charge the sensor’s power supply – the image sensors used to continuously toggles between image capture and power harvesting modes. The pixel design is very simple and it uses two transistor.
When the camera is not used to capture images, it can be used to generate power for other devices, such as phone or a watch.
“A few different designs for image sensors that can harvest energy have been proposed in the past,” Shree K. Nayar, the professor who led the team, said in a release about the project. “However, our prototype is the first demonstration of a fully self-powered video camera.”
Said Nayar, Who heads the computer vision laboratory at the Columbia Engineering
“We are in the middle of a digital imaging revolution. A camera that can function as an untethered device forever — without any external power supply — would be incredibly useful,”
The team will present the work at the international conference on computational photography at the Rice University in Houston April 24-26.