Ultraviolet Code Generator
Sheron Norsworthy
In particular I just ran into a site that used auto-generated codes but the codes it made were impossible to tell if a letter was a D an O or a 0. I i l 1 can also be indistinguishable depending on the type style.
This would seem like it should be a common UX guideline, never generate codes with those characters. Maybe even U V u v should be removed. g q and 9, 6 and G as well. Next to each other sometimes these are more obvious but in a random code it's not always clear.
Note: this question is not about passwords, it's about passcodes (maybe there is another name). A password is something a user can possibly create. A passcode is something a computer creates like emailing you a 6 character code to type in.
For example Apple will popup a 6 digit number, a passcode, on an registered Apple device when you try to log into icloud.com. Apple doesn't have the UX problem above because their passcodes are only digits, no letters.
Note: Obviously if you have 0 and O next to each other you can probably tell them apart. But if you the passcode it shows you is Z35O96 it's not going to be obvious to large percentage of users if that's a letter O or a number zero.
This is the golden solution to eliminate ambiguity and reduce short-term memory load. The character count and ambiguity of the numbers and letters don't matter if the user can use the passcode without memorizing it.
Conveniently, this same problem is present in another common use case: automobile license plates. Much like the passcode your mention here, the alphanumeric sequences 1) appear to be just a random assortment of meaningless characters, and 2) must be unambiguously legible.
There is another solution to consider: if you do not want to limit the character set of the generated code (which, in my opinion, is probably the easiest solution), simply accept both I/1 and O/0 in each others' places. This is sacrificing only a hair of entropy for the convenience of automatically resolving ambiguities in the passcode. Whether or not this increases or decreases the mental load of your users could be the topic of some quick user testing.
To consider: You need to put in balance where you will display this code too. For smaller sizes screens you might still have a problem with any font you choose. Also, this is not great when you need to send the user an email with that code, you will need to use a system font for that and you hit this problem again.
If possible use BOTH a font that makes the characters as distinguishable as possible such as a font intended for software development like JetBrains Mono AND colour code the character classes (alphabetic, numeric, other) NEITHER is a is a perfect solution by itself and even BOTH together is less than ideal, but it should give the user the best chance possible given a generator that produces potentially ambiguous characters. As with any colour based UI you should consider colourblindness.
If using numeric codes, make sure to use a font with a dotted or slashed zero to be safe. For hex or curated characters it might still be worthwhile to highlight the character classes in different colours just to provide a bit of additional context for the random string of characters.
I'm generating light maps for scene mesh objects using DirectX's UV Atlas Tool( D3DXUVAtlasCreate() ). I've succeeded in generating an atlas, however, when I try to render the mesh object using the atlas the seams are visible on the mesh. Below are images of a lightmap generated for a cube. Here is the code I use to generate a uv atlas for a cube:
With more restaurants opening up for business alongside the ebb and flow of state regulations concerning public health guidelines, business owners have been presented with the challenge of maintaining a sanitary environment for both their patrons and staff. This task is especially challenging for fast-paced environments such as restaurants and cafes where tables may be filled minutes after the last guest has left. As such, reusing physical menus not only presents a high risk of transmitting infectious disease, but also creates a significant delay as employees rush to sterilize them between tables. While many restaurants have displayed their ingenuity with single-use paper menus, others have embraced the digital age where nearly every customer carries a smartphone, and have taken advantage of QR code generators to create contactless menus.
With a well-placed sticker on the table featuring a unique QR code, something akin to a barcode, restaurants have removed the need for a physical menu by directing their patrons to a digitally accessible version. While QR code scanners are available on the Google Play Store, and even built into modern smartphone cameras by default, QR code generators can be much more difficult to settle on as the right choice. This article breaks down Displays2go's top applications for creating your QR code menu for your bar or restaurant.
QR code Monkey is a free, simple to use, QR code generator that allows users to create a unique code in less than five minutes. The interface is incredibly intuitive, existing entirely on one page with tabs for if you want to send your customer to a URL, Facebook page, an image of your menu, or a range of other options. Users can edit the color scheme and gradient to match their business with two or three simple clicks and even add a logo to the center of the image. The quality of the image is easily adjusted with a simple slider and each code can be exported as an .SVG, .PDF, or .EPS file to be printed at home or in-office.
Scanova is a great choice if you have someone on your team who is familiar with marketing principles, best practices, and is comfortable running diverse campaigns. With the plethora of options available, it is key to have a dedicated manager who knows how to manage the platform, create codes, and can understand analytical data in order to improve the customer-experience. While Scanova, at a minimum, costs $15 per month, this is money well spent and a fantastic way to keep your restaurant or bar menu up-to-date with evolving technology while adhering to safe social distancing practices. Scanova is a great upgrade to free QR code generators because of the value and power tracking and analytics offer, especially for chain restaurants or large-scale operations.
QR Tiger offers a desktop platform as well as a mobile app available for Android and iOS, making it easy to create, edit, and manage QR codes whether you are on the go or in the back office. This versatility, coupled with the ability to create dynamic QR codes, means that businesses can change their URL, links, logos, or images on the fly from any device. QR Tiger requires no sign-up, is free, and features the simplest interface on our list. The lack of options here is not a weakness, rather, a design choice that makes this platform accessible and user-friendly to anyone. While this company provides a quality free version, their paid monthly subscriptions offer scan analytics, tracking, and the ability to remove ads.
Entangled photon pairs are a vital resource for quantum information, computation, and metrology. Although these states are routinely generated at optical frequencies, sources of quantum of light are notably lacking at extreme ultraviolet (XUV) and soft X-ray frequencies. Here, we show that strongly driven systems used for high harmonic generation (HHG) can become versatile sources of entangled photon pairs at these high frequencies. We present a general theory of photon pair emission from non-perturbatively driven systems, which we refer to as "strong field pair generation" (SFPG). We show that strongly driven noble gases can generate thousands of entangled pairs per shot over a large XUV bandwidth. The emitted pairs have distinctive properties in angle and frequency, which can be exploited to discriminate them from the background HHG signal. We connect SFPG theory to the three-step-model of HHG, showing that this pair emission originates from the impact of high frequency vacuum fluctuations on electron recombination. The light produced by SFPG exhibits attosecond Hong-Ou-Mandel correlations, and can be leveraged as a source of heralded single photon attosecond pulses. Our findings aid ongoing efforts to propel quantum optics into the XUV and beyond.
Counterfeit products are a problem in many industries including pharmaceuticals, cosmetics, luxury goods, tobacco, and alcohol. The consequences of fake products and parts can range from lost revenue to parts that break or malfunction, putting users at risk and leading to litigation. Batch and lot control data in invisible matrix codes can serve as a hard-to-counterfeit sign of authenticity.
2D Data Matrix codes can be unsightly and interfere with high-end package design. Small packaging with many required languages can leave little available real estate for codes. Covert codes do not interfere with visible package design.
Certain types of barcodes contain information that should remain linked to one particular item, such as a time card or other individual record. Covertly printed Data Matrix codes cannot be duplicated by commonly available methods, such as copy machines.
Covert Data Matrix codes can contain quality assurance (QA) results, serial numbers, warning labels, supply chain tracking information, and many other types of information. And if there is a recall or product issue, the code can be scanned to verify that it complies with standards or requirements.
1D barcodes are not well suited for covert printing. The intensity of the fluorescence can vary unpredictably and be uneven from one part of the barcode to another. 2D Data Matrix codes are easier to work with since they take up a smaller region and have more robust error correction features.
While printing the code does not take any additional technology, reading the barcode requires a specialized device. It needs to provide illumination at the required range of UV or IR frequencies and decode the resulting code under a wide range of conditions. A modular mobile terminal that can turn a smartphone into a covert barcode reader is a good option. It uses a UV lighting module and lens filter to illuminate and quickly decipher the code using high performance decoding algorithms. To learn more, download the MX-1502 UV datasheet.
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