How does Digital Camera Works?
one of the most commonly used gadgets this days is the digital camera since it is easy to use and very much handy. and aside from that, we don’t have to spend for a 24 or 36 shots of film, instead, it is being used with a memory stick or memory card with a varrying memory capacities. but are we aware of how this stuff work?
a digital camera has an image sensor that instantly converts light into electrical charges by recording color images as intensities of red, green, and blue. these color images are then stored as variable charges on an image sensor chip coupled with a memory device (card or stick). most digital cameras employ a carge coupled device (CCD) image sensor, while some use complementary metal oxide semiconductor (CMOS) technology.
both CCD and CMOS use a technology similar to the way millions of tiny solar cells in a two-dimensional array convert ligt into electrical charges-by allowing the energetic protons to dislodge electrons from the semiconductor material that absorbs the light.
once the sensor has converted the light into electrons, it reads the accumulated charge (value) of each cell in the image. a CCD transports the electric charge across the semiconductor chip and reads it at one corner of the array. an analog-to-digital converter (ADC) then transforms each pixel’s value into a digital value by measuring the amount of charge at each photosite (a single row of pixel), converting that measurement to a binary form. CMOS devices, on the other hand, use several transistors at each pixel to amplify and move the charge using more traditional wires. (the CMOS signal is digital, so it doesn’t need ADC.)
modern digital cameras do not only capture still images but can capture video and sounds as well.
