Digital camera sensors come in two flavors, charge couple device (CCD) sensors and complementary metal–oxide–semiconductor (CMOS) sensors. In this video, Bill Hammack the Engineer Guy offers a short explanation of how CCD sensors capture and store images, and how a color filter array is used to capture color photos.
Posts Tagged ‘sensors’
Some time ago Sony announced a new series of “stacked” CMOS sensors that would bring a new level of quality to smartphone cameras. And now, several months later, rumors are floating about that Sony’s new LT29i smartphone — codenamed the Hayabusa — will be packing a 13-megapixel version of the new tech. Read more…
Samsung has developed what the company claims is the world’s first CMOS sensor that can capture both RGB and range images at the same time. Microsoft’s Kinect has received a good deal of attention as of late for its depth-sensing capabilities, but it uses separate sensors for RGB images and range images. Samsung’s new solution combines both functions into a single image sensor by introducing “z-pixels” alongside the standard red, blue, and green pixels. This allows the sensor to capture 480×360 depth images while 1920×720 photos are being exposed. One of the big trends in the next decade may be depth-aware devices, and this new development certainly goes a long way towards making that a reality.
Here’s a great diagram by Mobot that shows how the 41-megapixel sensor inside Nokia’s new 808 PureView phone stacks up against other popular sensor sizes. It’s pretty clear that they didn’t just milk a small sensor for more megapixels as a simply marketing ploy, but instead came up with a sensor that’s significantly larger than those found in other smartphones. Engadget also has a photo showing a comparison of sensor sizes, while Digital Trends has published an article on five reasons why the 41-megapixels isn’t a gimmick.
If you’re a fan of learning things through Khan Academy, then you might enjoy learning about how ISO works in this similar-styled tutorial by Dylan Bennett. Bennett might not have Salman Khan’s soothing voice, but he does his best to break down the magic of digital camera sensors into easy to understand ideas. For a more detailed and comprehensive understanding of how things work, check out Cambridge in Colour’s excellent tutorials.
Devin Coldewey of TechCrunch created this helpful diagram showing the relative sizes of various sensors, including the one found inside the Lytro light field camera (a camera that lets you focus after shots are taken). The FCC published photos of the Lytro camera’s guts last week, revealing that the sensor inside is roughly 6.5×4.5mm (smaller than our previous estimate). This means that it’s slightly larger than the iPhone sensor and slightly smaller than the one in most point-and-shoot cameras.
Another interesting finding is that the chip inside supports Bluetooth and Wi-Fi. The company says that they’re working on wireless connectivity, but doesn’t have it enabled in the initial Lytro camera.
Destin of Smarter Every Day made this helpful video in which he and his daughter explain the basics of light painting and digital camera sensors using “super simple speak”.
Ever wonder why camera manufacturers these days are describing often sensor sizes with fractions instead of millimeters? Roger Cicala of LensRentals explains:
[…] then we get into all of these fractional-inch-type-measurements for the smaller sensors. That measurement system originated in ancient times (the 1950s to 1980s) when vacuum tubes were used instead of CCD or CMOS sensors in video and television cameras. The image sensor was, in those days, referred to in terms of the outside diameter of the vacuum tube that contained it.
Why do manufacturers keep using such an archaic measurement? Because it helps them lie to you, of course. If you do the math 1/2.7 equals 0.37 inches, which equals 9.39 mm. But if you look at the chart above you’ll see that a 1/2.7″ sensor actually has a diagonal of 6.7 mm. Why? Because, of course, a thick glass tube used to surround the sensors. So they calculate the sensor size as if the glass tube was still included. Makes perfect sense to a marketing person who wants to make their sensor seem larger than it is. What sounds better: 1/2.7″ or ‘less than 10% the size of a full frame sensor’?
If you have a few minutes, give his entire post on sensor sizes a read — it’s quite illuminating.
Sensor Size Matters [LensRentals Blog]
Image credits: Photograph by Sphl
After arriving late to the digital photography party, Kodak took another step away from the market yesterday by selling off its sensor business to CA-based firm Platinum Equity. The sale of Kodak Image Sensor Solutions (KISS) — which includes the company’s 263,000 square foot facility in Rochester — will hopefully give Kodak the boost of cash it needs to avoid bankruptcy and turn into a healthy business. Kodak sensors are found in a number of popular cameras, including the Leica M9 and S2.
The company is also looking into selling a chunk of its patents to raise more cash, which will help it in its current efforts to transform into a printer and ink company.
Here’s a photograph by the The Bangkok Post showing Sony’s sensor manufacturing plant in Thailand submerged under flood waters roughly 3 meters (~10ft) high. The shutdown of the 502,000 square foot, 3,300 employee plant doesn’t just affect Sony, as other companies — including Nikon and Apple (in the iPhone 4S) — rely on Sony image sensors as well.
Image credit: Photograph by Pattarachai Preechapanich/The Bangkok Post