Digital Cameras Aaron Hardy Matt Ejak A camera that captures images electronically rather than on film. The image is captured by electronic imaging sensors called charge-coupled devices (CCDs) or complimentary metal-oxide semiconductors (CMOS) , and stored in the camera's random access memory or an optical disk. As with all digital devices, there is a fixed, maximum resolution and number of colors that can be represented. These images can be transferred to a computer for modification, long-term storage, or to be printed.
Types of cameras • 5 different • Basic Idea • Brief description • CMOS/CCD • Basic settings • Usefulness • Share/send • Modify
Semiconductors, like the CCD camera sensor, have 2 bands of electron energy levels/shells called the valence and conduction bands. Valence band electrons are bound to atoms, while conduction band electrons (higher energy) move freely through the atomic lattice of the semiconductor. The photoelectric effect dictates the minimum energy needed for incoming light to be captured as an image. Standard SLR: An incoming photon reaches the CCD sensor with enough energy to excite an electron in a valence-band shell to a conduction-band shell. That electron is then stored in a photocell until the rest of the light is collected and the shutter closes. The electrons are then The photocells map light intensity values, but not color. Beam Splitter -> 3 CCDs (high-end DSLR) 1 CCD with a Bayer Filter Mosaic (or other CFA) Camera companies have their own closely guarded algorithms to interpolate and demosaic the final image
A CCD Sensor A CMOS Sensor Hack your camera’s firmware with CHDK: http://www.physorg.com/news171209557.html http://hackaday.com/2008/05/27/how-to-expand-your-camera-with-chdk/ http://lifehacker.com/387380/turn-your-pointandshoot-into-a-supercamera Make a 3D camera: http://news.cnet.com/8301-13580_3-9793272-39.html http://www.popularmechanics.com/technology/how-to/tips/how-to-make-a-3d-camera
References • http://en.wikipedia.org/wiki/Digital_camera • Hecht, Eugene. Optics. 4th ed. New York: Pearson, 2002. • http://electronics.howstuffworks.com/camera.htm • http://electronics.howstuffworks.com/cameras-photography/digital/digital-camera.htm • http://www.homephotog.com/tutorials/settings.shtml • http://www.fas.org/irp/imint/docs/rst/Intro/Part2_5a.html • "digital camera." Encyclopædia Britannica. 2010. Encyclopædia Britannica Online. 17 Nov. 2010 <http://www.britannica.com/EBchecked/topic/882189/digital-camera>. • http://ocw.mit.edu/courses/mechanical-engineering/2-71-optics-fall-2004/lecture-notes/