ChaoticNeutralCzech
@ChaoticNeutralCzech@feddit.org
- Comment on Nintendon't 2 days ago:
This one is for media, as an HDMI alternative. It goes up to 8K (192 Gb/s) and 480 W of power delivery. I hope there is no DRM on those.
- Comment on Internet email for dummies 2 days ago:
Not anymore
- Comment on Internet email for dummies 2 days ago:
WinRAR’s password and archive-splitting feature, I assume. 7-Zip was around since 1999 but not as popular.
- Comment on Oppa oppa 6 days ago:
The statue is, unsurprisingly, in Gangnam. Personal judgement of the song aside, it made the district world-famous. That’s enough reason to erect a monument.
- Comment on What time is it? 1 week ago:
NFC implants are expensive but wristbands are not. Maybe that could work… I wonder if they make some that don’t look like mini watches, maybe a strap with a fashionably integrated chip and antenna?
- Comment on What time is it? 1 week ago:
Lemmy automatically adds trailing slashes to links, apparently. However, you can cheat that by creating a hyperlink whose display text is “time.<zwsp>gov” where “<zwsp>” is a zero-width space.
- Comment on What time is it? 1 week ago:
You don’t have to print on temporary tattoo paper. Use regular paper and scissors to create a wristband. That is enough to test if the geometry is good enough for the scanner.
- Comment on What time is it? 1 week ago:
Yeah, at 1 mm per pixel, this will not last long.
How about an NFC implant? They can point to URLs too…
- Comment on What time is it? 1 week ago:
Nah, it’s 30%, and very much depends on how the damage is laid out.
- The corner squares (finder patterns) must keep a ⬜⬛⬜⬛⬛⬛⬜⬛⬜ cross-section at most angles. Most readers will accept even round ones. This applies to the smaller squares (alignment patterns) on larger QR codes too.
- The zebra strips ⬛⬜⬛⬜⬛ (“timing patterns” if you’re a nerd) connecting the finder patterns must remain intact. Very few readers can correct for errors in that.
- At this point, a good reader will be able to detect the QR code’s position in the image and its resolution (“version” if you consume ISO propaganda), and thus calculate the location of every pixel (“element”, ditto). Each of those will usually be sampled at a radius of around ⅓ of the distance between them. This allows for slightly wavy codes but also codes with rounded pixels or even unrelated content in the edges. (For the record, this is lazy and I prefer this version of the concept that uses almost up-to-spec QR codes.) Google Lens is more sophisticated than just using a 3D perspective transform, as I already mentioned.
- One line of pixels around finder patterns is necessary for decoding (mask and ECC level info) and has basically no error correction so it should be also clear except the ⅓²=⅑ trick described above.
- The data is stored with robust Reed-Solomon correction, which is byte-wise. You can safely cover about half of the advertised recoverable area with contiguous damage anywhere except the sections mentioned above. Still, you can damage more area by taking several things into account:
- Know how the data is laid out in the specific QR resolution, and keep in mind that Reed-Solomon is bytewise. Thus, you want to damage as few bytes as possible, and for most total area, the strategy is to ruin all 8 bits in each. Without deeper analysis (looking up the byte layout), a good rule of thumb is that vertical damage aligned to an even number of columns from the right (skipping Column 7 with the vertical zebra stripe and thus no data) is likely to ruin the least amount of bytes partially.
- Looking up the byte layout will also reveal that there are probably 1-7 unused pixels in the leftmost two columns, probably arranged like ⡿ in the very top of the data portion (Row 10 and below). These can be damaged without consequence!
- Damage whose very dark spots line up with original black pixels (and vice versa) does not really count. Keep in mind that while using this strict definition of damage results in way fewer damaged bits, those are most likely not contiguous, so only a few 8-bit bytes will remain intact through this.
- Know how the data is laid out in the specific QR resolution, and keep in mind that Reed-Solomon is bytewise. Thus, you want to damage as few bytes as possible, and for most total area, the strategy is to ruin all 8 bits in each. Without deeper analysis (looking up the byte layout), a good rule of thumb is that vertical damage aligned to an even number of columns from the right (skipping Column 7 with the vertical zebra stripe and thus no data) is likely to ruin the least amount of bytes partially.
- Comment on I will be taking no followup questions. Thank you for your time 1 week ago:
"We have ἤλεκτρον (elektron), can you show us?
- Comment on What time is it? 1 week ago:
Print one out at 1:1 scale and wrap it around your wrist, then test it. Curved surfaces are challenging for QR code readers. AFAIK Google Lens is one of the best ones (it will follow edges of pixels in wavy codes) but you’ll want any old open source one to work.
- Comment on What time is it? 1 week ago:
Yes it’s already scannable…
Why wouldn’t it be? I’ve drawn 2 QR codes on graph paper already and of course they work.
- Comment on Can someone fact check this 1 week ago:
PLEASE DON’T starve the owl! There is another way: metabolism rate is proportional to the number of O₂ + hydrocarbons → CO₂ + H₂O reactions in the body, which can be measured as the amount of CO₂ created during respiration. For humans, the CO₂ concentration in exhaled air is close to constant, so by inhaling through the nose and exhaling through the mouth into a bag (and not consciously hyper- or hypoventilating), one can get a very good measurement of one’s metabolism rate in different scenarios (and the lag is seconds, not hours for nutrition!). This is obviously way more difficult to do with a flying owl (even in a wind tunnel) but perhaps a surgically inserted airflow meter could work.
- Comment on Fell off the horizon into a black hole 2 weeks ago:
Haha, and insert chest joke
- Comment on These mugs are getting out of hand 2 weeks ago:
Wordpress makes kitchen sink taps now?
- Comment on Fell off the horizon into a black hole 2 weeks ago:
3D-flat as opposed to 2D-flat, or a bigger, crazier theory?
- Comment on She's got the talent 2 weeks ago:
Objectively stupid way of saying “7 out of 9” or “78%”.
- Comment on HÖNKHALT 3 weeks ago:
This arrangement does not hålt the hönking though
- Comment on Lara Croft is a Sociopath 3 weeks ago:
There is a shitty 2007 TV movie by ČT Studio Brno (at this point, “shitty” is redundant) Kája a Zabi, where the protagonist, little boy Kája, mashes his keyboard in frustration, causing an off-brand Lara Croft to appear IRL. I haven’t seen the movie but she allegedly speaks broken Czech in a weirdly modulated voice, and keeps asking who Kája needs to kill (“zabít”, hence the nickname she gets). I assume she is just about as psychopathic as Lara.
- Comment on relationship 3 weeks ago:
Jarrod Radnich’s piano arrangenent for He’s a Pirate ends with the “Sit on lower half of the keyboard” instruction. This is a good approximation of what the male portion of the polycule will sound like.
- Comment on relationship 3 weeks ago:
That’s as many as grand piano keys!
- Comment on US presidents are getting younger over time 3 weeks ago:
I want to see a Presidents vs States chart. It’s 47 vs 50 now, we better act quickly with DC and Puerto Rico. The last time we got this close, there was a civil war.
- Comment on It's all been downhill since this moment 3 weeks ago:
This is not exactly what people received. The number of addresses did not fit and overflowed into the body.
MCKINLEY@USC-ISIB MMCM@SRI-KL OT-ITS@SRI-KA BELL@SRI-KL MEADE@SRI-KL MARTIN@USC-ISI MERRILL@BBN-TENEX METCALFE@PARC-MAXC JMETZGER@USC-ISIB MICHAEL@USC-ISIC CMILLER@SUMEX-AIM MILLER@USC-ISI SCI@USC-ISI MILLER@USC-ISIC MITCHELL@PARC-MAXC MITCHELL@USC-ISI MITCHELL@SUMEX-AIM MLM@SU-AI JPDG@TENEXB MOORE@USC-ISIB WMORE@USC-ISIB JAM@SU-AI MORAN@PARC-MAXC ROZ@SU-AI MORGAN@USC-ISIB MORRIS@PARC-MAXC MORRIS@I4-TENEX OT-ITS@SRI-KA LISA@USC-ISIB MOSHER@SRI-KL MULHERN@USC-ISI MUNTZ;BIN(1529)@UCLA-CCN MYERS@USC-ISIC MYERS@RAND-RCC DRCPM-FF-FO@BBN-TENEXB NAGEL@USC-ISIB NAPKE@SRI-KL NARDI@SRI-KL NAYLOR@USC-ISIE LOU@USC-ISIE NESBIT@RAND-RCC NEUMANN@SRI-KA NEVATIA@USC-ECL NEWBY@USC-ISI NEWEKK@SRI-KA NIELSON@SRI-KL NLL@SUMEX-AIM NILSSON@SRI-KL NITZAN@SRI-KL NOEL@USC-ISIC NORMAN@PARC-MAXC NORTON@SRI-KL JOAN@USC-ISIB NOURSE@SUMEX-AIM PDG@SRI-KL OMALLEY@SRI-KA OCKEN@USC-ISIC OESTREICHER@USC-ISIB OGDEN@SRI-KA OKINAKA@USC-ISIE OLSON@I4-TENEX ORNSTEIN@PARC-MAXC PANKO@SRI-KL TED@SU-AI PARK@SRI-KL PBARAN@USC-ISI PARKER@USC-ISIB PEARCE@USC-ISI PEPIN@USC-ECL PERKINS@USC-ISIB PETERS@SRI-KL AMPETERSON@USC-ISI ASLAB@USC-ISIC EPG-SPEC@SRI-KA PEZDIRTZ@LLL-COMP CHARLIE@I4-TENEX UCLA-DOC@USC-ISI WPHILLIPS@USC-ISI PIERCY@MOFFETT-ARC PINE@SRI-KL PIPES@I4-TENEX PIRTLE@SRI-KL POGGIO@USC-ISIC POH@USC-ISI POOL@BBN-TENEX POPEK@USC-ISI POSTEL@USC-ISIB POWER@SRI-KL PRICE@USC-ECL RANDALL@USC-ISIB RANDALL@SRI-KA RAPHAEL@SRI-KL RAPP@RAND-RCC RASMUSSEN@USC-ISIC RATTNER@SRI-KL RAY@ILL-NTX FNWC@I4-TENEX BRL@SRI-KL RETZ@SRI-KL SKIP@USC-ISIB RICHARDSON@USC-ISIB RICHES@USC-ECL GWEN@USC-ECL OP-RIEDEL@USC-ISIB RIES@LLL-COMP RINDFLEISCH@SUMEX-AIM OP-ROBBINS@USC-ISIB ROBINSON@SRI-KL JROBINSON@SRI-KL RODRIQUEZ@SRI-KL MARTIN@USC-ISI ROM@USC-ISIC ROMIEZ@I4-TENEX ROSE@USC-ISI ROSEN@SRI-KL BARBARA@I4-TENEX ROTHENBERG@USC-ISIB RUBIN@SRI-KL JBR@SU-AI RUBINSTEIN@BBN-TENEXD RUDY@USC-ECL RUGGERI@SRI-KA RULIFSON@PARC-MAXC DALE@USC-ISIB SACERDOTI@SRI-KL SAGALOWICZ@SRI-KL ALS@SU-AI SANTONI@USC-ISIC SATTERTHWAITE@PARC-MAXC SAWCHUK@USC-ECL CPF-CC@USC-ISI SCHELONKA@USC-ISI SCHILL@USC-ISIC SCHILLING@USC-ISI SCHULZ@SUMEX-AIM SCOTT@SUMEX-AIM CPF-CC@USC-ISI OP-SEATON@USC-ISIB SENNE@LL NORM@RAND-UNIX AFWL@14-TENEX SHEPPARD@LL-ASG SHERWIN@USC-ISI SHERWOOD@SRI-KL SHORT@SRI-KL SHORTLIFE@SUMEX-AIM SHOSHANI@BBN-TENEX MARTIN@USC-ISI UCLA-NMC@USC-ISIE SDL@USC-ISIC SKOCYPEC@USC-ISI SLES@USC-ISI SLOTTOW@UCLA-CCN NOAA@14-TENEX SMALL@USC-ISI DAVESMITH@PARC-MAXC DSMITH@RAND-UNIX SMITH@SUMEX-AIM SMITH@USC-ECL MARCIE@I4-TENEX USARSGEUR@USC-ISI LOGICON@USC-ISI EPA@SRI-KL SONDEREGGER@USC-ISIB SPEER@LL AMICON-RN@USC-ISI SPROULL@PARC-MAXC PROJX@SRI-KL STEF@SRI-KA STEFIK@SUMEX-AIM STEPHENS@SRI-KA CFD@I4-TENEX STOCKHAM@SRI-KA STOTZ@USC-ISIB ALLEN@UCLA-SECURITY STOUTE@MIT-ML STRADLING@SRI-KL STROLLO@PARC-MAXC UCLA-0638@UCLA-CCN CRT@SRI-KA SUNSHINE@RAND-UNIX SUTHERLAND@SRI-KL SUTHERLAND@RAND-UNIX SUTHERLAND@PARC-MAXC SUTTON@USC-ISIC SWEER@SUMEX-AIM TAFT@PARC-MAXC TAYLOR@USC-ISIB TAYLOR@PARC-MAXC TAYNAI@SUMEX-AIM TEITELMAN@PARC-MAXC TENENBAUM@SRI-KL GREEP@RAND-UNIX TERRY@SUMEX-AIM TESLER@PARC-MAXC THACKER@PARC-MAXC PWT@RAND-UNIX TIPPIT@USC-ISIE TOBAGI@USC-ISIE TOGNETTI@SUMEX-AIM TORRES@SRI-KL TOWNLEY@HARV-10 ELINA@UCLA-ATS TUCKER@SUMEX-AIM TUGENDER@USC-ISIB LLLSRG@MIT-MC UNCAPHER@USC-ISIB NOSC@SRI-KL UNTULIS@SRI-KL MIKE@UCLA-SECURITY AARDVARK@UCLA-ATS UZGALIS;BIN(0836)@UCLA-CCN VANGOETHEM@UCLA-CCN VANMIEROP@USC-ISIB VANNOUHUYS@SRI-KL VEIZADES@SUMEX-AIM VESECKY@USC-ISI AV@MIT-DMS VICTOR@USC-ISIC VIDAL@UCLA-SECURITY OP-VILAIN@USC-ISIB RV@RAND-UNIX SDL@USC-ISIC VOLPE@SRI-KL VONNEGUT@I4-TENEX VU@SRI-KL WACTLAR@CMU-10A WAGNER@USC-ISI WAHRMAN@RAND-UNIX WALDINGER@SRI-KL WALKER@UCLA-SECURITY WALKER@SRI-KL WALLACE@PARC-MAXC EVE@UCLA-SECURITY LOGICON@USC-ISI DON@RAND-UNIX WATSON@USC-ISIC WEIDEL@USC-ECL WEINBERG@SRI-KL JLW@MIT-AI LAUREN@UCLA-SECURITY WEISSMAN@I4-TENEX WELLS@USC-ISIC GERSH@USC-ISI WETHEREL@LLL-COMP RWW@SU-AI SCRL@USC-ISI TWHELLER@SRI-KA MABREY@SRI-KL WHITE@PARC-MAXC WHITE@SUMEX-AIM WIEDERHOLD@SUMEX-AIM WILBER@SRI-KL EPG-SPEC@SRI-KA WILCOX@SUMEX-AIM WILCZYNSKI@USC-ISIB WILE@USC-ISIB OP-WILLIAMS@USC-ISIB WILSON@USC-ISIB TW@SU-AI SCI@USC-ISI WISNIEWSKI@RAND-UNIX WOLF@SRI-KL PAT@SU-AI NELC3030@USC-ISI WYATT@HARV-10 LEO@USC-ISIB YEH@LLL-COMP YONKE@USC-ISIB YOUNGBERG@SRI-KA ZEGERS@SRI-KL ZOLOTOW@SRI-KL ZOSEL@LLL-COMP DIGITAL WILL BE GIVING A PRODUCT PRESENTATION OF THE NEWEST MEMBERS OF THE DECSYSTEM-20 FAMILY; THE DECSYSTEM-2020, 2020T, 2060, AND 2060T. THE DECSYSTEM-20 FAMILY OF COMPUTERS HAS EVOLVED FROM THE TENEX OPERATING SYSTEM AND THE DECSYSTEM-10 <PDP-10> COMPUTER ARCHITECTURE. BOTH THE DECSYSTEM-2060T AND 2020T OFFER FULL ARPANET SUPPORT UNDER THE TOPS-20 OPERATING SYSTEM. THE DECSYSTEM-2060 IS AN UPWARD EXTENSION OF THE CURRENT DECSYSTEM 2040 AND 2050 FAMILY. THE DECSYSTEM-2020 IS A NEW LOW END MEMBER OF THE DECSYSTEM-20 FAMILY AND FULLY SOFTWARE COMPATIBLE WITH ALL OF THE OTHER DECSYSTEM-20 MODELS. WE INVITE YOU TO COME SEE THE 2020 AND HEAR ABOUT THE DECSYSTEM-20 FAMILY AT THE TWO PRODUCT PRESENTATIONS WE WILL BE GIVING IN CALIFORNIA THIS MONTH. THE LOCATIONS WILL BE: TUESDAY, MAY 9, 1978 - 2 PM HYATT HOUSE (NEAR THE L.A. AIRPORT) LOS ANGELES, CA THURSDAY, MAY 11, 1978 - 2 PM DUNFEY'S ROYAL COACH SAN MATEO, CA (4 MILES SOUTH OF S.F. AIRPORT AT BAYSHORE, RT 101 AND RT 92) A 2020 WILL BE THERE FOR YOU TO VIEW. ALSO TERMINALS ON-LINE TO OTHER DECSYSTEM-20 SYSTEMS THROUGH THE ARPANET. IF YOU ARE UNABLE TO ATTEND, PLEASE FEEL FREE TO CONTACT THE NEAREST DEC OFFICE FOR MORE INFORMATION ABOUT THE EXCITING DECSYSTEM-20 FAMILY.
- Comment on Hobbies 3 weeks ago:
Average People Hobbies: Culture War
Rich People Hobbies: Class War
- Comment on We're all going home early today 3 weeks ago:
See my other comment, metal in a microwave is sometimes OK but there is a good reason we scare people from trying it.
- Comment on Who the fuck needs an x axis anyway 3 weeks ago:
There is an 𝑥 axis and it’s not too hard to comprehend, although I’d prefer the dividing character to be newline rather than “|”, or only show the latter date.
- Comment on Experts disagree 4 weeks ago:
Wait until you hear about his other famous book
- Comment on Dinner is ready! 4 weeks ago:
Wurst, kiełbasa, pierogi, bagels, vepřo-knedlo-zelo, svíčková, chlebíčky and of course it’s the only region to combine wine, beer and vodka.
- Comment on Why can't countries with vast deserts make solar farms to power the world? 4 weeks ago:
Panels are effectively part of the earth. It’s one closed system.
You do have a point: a black body radiates more heat than a high-albedo one so at night, the panels can cool down below ambient temperature. Overall, low albedo (reflectivity) and small thermal mass causes higher temperature differences between day and night – and it’s daytime when people want cooler temperatures.
But yes, any shade will help people living below solar panels feel cooler on sunny days, which is why I advocate for building a solar roof over just about every parking lot.
- Comment on Why can't countries with vast deserts make solar farms to power the world? 4 weeks ago:
They’re black, duh. Yes, some 20% of incoming energy becomes electricity but the rest gets turned into heat. A reflective (white) material heats up way less.