2017-11 :: Kai Ruhl :: link to article
Imgur showcases the BFS-Auto book scanner by Uni Tokyo, Japan, a research prototype capable of 4 pages/second (video). Uses a slow-moving cylinder to release pages quickly, laser scanner+stereo cameras for realtime page form recognition (and undeforming), and finally optical character recognition (OCR).
2017-10 :: Kai Ruhl :: link to article
Holding a laser pointer to the end of a fiber optic cable nicely shows the total internal reflection producing a sine wave, which can travel around curves in the cable, illustrated by Imgur. Howstuffworks and Explainthatstuff have more details.
2017-09 :: Kai Ruhl :: link to article
PetaPixel reports on the bridge (i.e. non-changeable lens) camera RX10 by Sony, with the lens being a wide 24mm at minimum and a pretty zoomy 600mm at maximum. Comes with up to 960 fps video and a tracking auto-focus that is targetted at sport events. However, its 13mm width image sensor does not capture as much light as APS-C with 23mm or full frame with 35mm.
2017-08 :: Kai Ruhl :: link to article
PetaPixel and TheVerge report on the state of Project Tango, an active light depth sensor (infrared structured light) for phones. Apparently, Qualcomm produces new off-the-shelf components. Previous phones with Tango were the Lenovo Phab2 Pro (2016) and the Asus Zenfone AR (2017).
2017-07 :: Kai Ruhl :: link to article
Hackaday and Heise [de] report on the DuoCopter, a drone with one-blade rotors that control the speed per revolution, allowing e.g. a left strafe by accelerating the rotor while on the left side and deccelerating on the right side. As a consequence, only two rotors are needed for navigation.
2017-06 :: Kai Ruhl :: link to article
When on Windows, network analysis tools do not come with the system, but SysInternals and Nirsoft have handy little executables, including TcpView (like tcptrack), BluetootView, CurrPorts and SmartSniff (like WireShark).
2017-05 :: Kai Ruhl :: link to article
The godbolt Compiler Explorer is a web form to write C++ (and other, rarer languages) source in, to see how the compiled result looks like in assembler. Useful in discussions about the efficiency of language features.
2017-04 :: Kai Ruhl :: link to article
My computer circus now includes a 13" Yoga 900 ISK (not ISK2, those have RAID mode only, which requires a BIOS update before installing Linux). Keyboard includes programmer-friendly Pos1/End/PgUpDown keys, 3200x2000 touch screen requires 150% scaling and runs on Intel HD 520 GPU, USB Type C port (which includes DisplayPort) is 3.0 only, which means 5/10Gps and 10/100W power. The hinge is nice, and Ubuntu 16.04 Xenial runs well enough.
2017-03 :: Kai Ruhl :: link to article
Road to VR points to a Oliver Kreylos analysis of the HTC Vive (VR headset), in particular its tracking: Two lasers at diagonal ends of the room emit vertical and horizontal laser lines at 60Hz, and photodiodes all around the VR headset use the known timing to calculate the head position and orientation at 120Hz. GizModo has an intro. Compared to Oculus Rift and Playstation VR which have light emitters on the headset and an optical tracker in front of the user, this system can "look" in all directions at once, improving accuracy.
2017-02 :: Kai Ruhl :: link to article
Petapixel reports on the Xperia XZ phone whose camera shoots 720p@960fps, using an about 6mm Sony Exmor RS sensor (a new variant of the IMX300) with stacked RAM. Includes phase auto focus and an f/2.0 aperture, as well as a 2x optical zoom (only the perpendicular 5x zoom by Oppo is better). See also: DSLR basics.
2017-01 :: Kai Ruhl :: link to article
The RED Helium sensor inside the Epic S35 films 16-bit RAW with 8K at 30fps, which amounts to up to 275MB per second; so bring a big SSD. PetaPixel reports that the low-light sensitivity is as good as the Sony A7r II. Costs 30K as Epic, and 50K as the 75fps RED Weapon S35.
2016-12 :: Kai Ruhl :: link to article
PetaPixel reports on a Some Stuff Explained video tutorial about camera basics using nice particle animations: Increasing the amount of photons perceived by the camera either by opening the aperture, increasing the shutter time or increasing sensor sensitivity.
2016-11 :: Kai Ruhl :: link to article
Music theory is usually not physics-based, for historic reasons. In contrast, the light note project shows how sound waves translate into harmonies and musical scales, yielding a beginner's scientific approach to making music.
2016-10 :: Kai Ruhl :: link to article
PetaPixel and Sploid report on slow-motion underwater explosions (video) recorded by the Slow-mo guys, using a Phantom V2511 (costs 150K EUR) at 28Kfps and at 120Kfps, respectively. The initial photon blast is followed by a gas bubble, which eventually collapses again, yielding a second photon blast.
2016-09 :: Kai Ruhl :: link to article
Every few years, it has to be done: Upgrade your SSH keys, this time to elliptic curve 25519 by DJB. Fortunately, you can add the new keys to .ssh and then successively reconfigure all servers while keeping the old keys in the meantime. Or, in short: ssh-keygen -o -a 100 -t ed25519.
2016-08 :: Kai Ruhl :: link to article
Karl Taylor scribbles on a professional foto (video) to break down how he designed the lighting of the shot, featuring a person and a sofa, and more importantly all the right shadows and soft/hard lighting at the right spots.