retina biometrics

Being Retina display does not depend only on the PPI. It also depends on the viewing distance. Using the formula A = 2tan-1 (H/2d) at 15 inches (2.54 cm) away qualifies for a retina display. The eyes cannot discern the pixels at the distance, which is the essence of retina display. How is retina's screen defined? Why is the resolution of a new iPad scree

Apply the discovery of human retina to image processing ~ Spectral Whitening spectrum albino that have 3 important effects: high Spatio-temporal frequency signals canceling (noise), M Id-frequencies details enhancement and low frequencies luminance energy reduction. This directly allows visual signals cleaning of classical undesired distortions introduced by Image sensors and input luminance range. local logarithmic luminance brig

IPhone4 mediumHTML5 CanvasOptimizationRetinaThe screen is the content to be introduced in this article.IPhone4,RetinaScreen is widely used in mobile devices. AlthoughRetinaThe screen brings unprecedented clear and smooth effects to the display of the screen, but it brings some little trouble to developers. HowRetinaThere are many articles on designing the software UI on the screen. I don't want to repeat the content here, but wantHTML5 canvasInRetinaThe application on the screen tells me some of

What about the imac Retina screen? Is the imac's Retina screen resolution high? Apple released an invitation to the new product launch, which will be released by Apple, and recently, the big media have said that Apple will release the Retina imac, which is a surprise news to netizens. Since the apple out of the retina

What's a retina?The so-called "Retina" is a display technique that compresses more pixels into a single screen to achieve higher resolution and better screen display, taking the MacBook Pro with Retina display as an example, When working, the graphics card renders the image in the size area of 2880x1800 pixels, which is a group of four pixels, outputting one pixe

Speaking of the innovations brought about by the iPhone 4, retina display is definitely the most eye-catching one, so that when I watch the computer's display screen, I can see the pixels on the screen. Depending on this Retina display, the iPhone 4 resolution reaches 640x960 pixels; however, to maintain downward compatibility, it still uses 320x480 points. That is to say, when a common image is displayed w

Since Apple released the retina MacBook Pro last month, it is estimated that it was the first time Apple had shortened the delivery time of the retina MacBook Pro for new orders received by Apple's online stores. The first improvement in the delivery time appeared in the Apple Asia Pacific market. In the Asia Pacific market, we can see that the delivery time has changed from 3-4 weeks to 2-3 weeks.The deliv

In recent years, Apple has introduced a Retina display on its flagship device. According to Apple, his pixel density is very high enough to make the human eye indistinguishable from individual pixels.The UIScreen class provides an easy way to monitor whether the current device provides a built-in retina display. Check the scale property of the screen, which provides a conversion factor that translates from

Label: style blog HTTP Io ar use Java for SP With the release of the new iPad, the tablet will gradually enter the retina era. In high-resolution devices, the image display effect is usually unsatisfactory. To achieve the best display effect, you need to optimize the image, here are some optimization methods:I. Replacing images with CSS This is applicable at any time. Currently, we can use more style sheets to create design results, css3's rounded cor

Apple released this month's 13-inch Retina MacBook Pro, in addition to upgrading the internal main configuration, but also added a new Force touch trackpad, so there is still a need to disassemble again, let everyone see the new Force touch under the hidden secrets. If you want to learn about the performance of the new 13-inch Retina MacBook Pro, you can view our review articles. Bu

Today, I will start using new tools to develop iPhone games: Corona SDK Created on top layers of OpenGL, OpenAL, Box2D, and Lua, Corona allows you to develop games that run at native speeds using local IOS features, such as multi-touch, GPS, accelerometer, gyroscope, camera, google Maps, WebKit, and keypad. In addition, Corona supports a large number of APIS, which will allow you to add a lot of interesting features for your game, such as advertising, virtual currency, database and so on. In th

Google revealed on Wednesday that its Chrome browser has an advantage in Apple's new membrane display MacBook Pro. Google software engineer Nico Weber posted Chrome with high-resolution support on the company's official Chrome blog and said: "We will focus on making Chrome more beautiful in the next few weeks ." In fact, Google has begun testing the new Chrome Canary developer version. Anandtech's Anand Lal Shimpi says Chrome Canary is more elegant than earlier versions. In addition, Lal Sh

How to install Linux on MacBook Pro Retina MacBook Pros has very powerful configuration, but some people want to strengthen, they want to use the Linux system. Whether you want a more open and personalized operating system or you only want to use some software specific to Linux, you will want to install Linux on your MacBook. It's a pity that the MacBook Pro is a piece of hard-pressed bricks, making it impossible for you to install other systems. Lin

Article reproduced from the Cool qin net http://www.kuqin.com/Original link: http://www.kuqin.com/shuoit/20150530/346322.htmlOriginal abstract: Some days ago always asked about the IOS Retina screen, set 1px border, the actual display 2px, how to solve?Finally found a useful method: pseudo-class + transformThe principle is to remove the original elements of the border, and then use :before or :after redo border, and transform scale reduction of half,

Media QueriesUse CSS3 Media query to achieve high-definition screen image processing.{ . logo { background-image: url (' img/[email protected] '); Background-size: 400px 200px; width: 400px; height: 200px; } }Sass's Mixin//-----------------------------------Retina pictures----------------------------------------- { @media (min--moz-device-pixel-ratio: 1.3), (-O-MIN-DEVICE-PIXEL-RATIO:2.6/2), (- webkit-min-device-pixel-ratio

　　IPhone4 and Iphone4s's high-definition Retina screen display is stunning, and many people may not know that Apple is actually planning to provide high-definition display support for the retina resolution of the MAC. Although we can't get it now, we can turn on the hidden functionality of the lion system through the gadgets provided in the Xcode. First we can go to the Mac App Store and download the Xcode

Recently started a Retina Macbook, found that iwork and office performance is very poor, and there is no corresponding update, because in the future study life will be very much application word, PPT, so feel to start a rmbp some uncomfortable, even want to change a non-retina machine. However, it has been discovered by accident that some people have proposed optimizing the performance of iwork on

Believe that a lot of Mac users have installed a virtual machine system on the Mac, some use the retina display of the MacBook users in the use of virtual machine software to install the Win7 system often encountered the display is very small, affecting the normal use of the problem, So what if the system icon for the Retina MacBook Loader is too small? Today's small series will bring you relevant solutions

[Retina] The 1 px border on the mobile phone, and the value of the chain 1 pixel border, 2 "Placeholder" on the screen at 2x, 3 "Placeholder" on the screen at 3x, but the designer needs 1 "Placeholder" 1. content h1: after, 2. content h2: after {3 border-top: 1px solid # bfbfbf; 4 content: ''; 5 display: block; 6 width: 100%; 7 position: absolute; 8 left: 0; 9 bottom: 0; 10-webkit-transform-origin: left bottom; 11} 12/*

system, remember to install the Boot Camp tool (driver) on the USB flash drive!7. Window 7 is not good for retina support, a better solution is to use the N Card Setup tool to set the resolution to 1440x900, and to adjust the font dpi of Windows to 100%. It is recommended that you install Windows 8.1 without resolution issues.Windows 8.11. Download the Windows 8.1 image file, and note download the official version! My next is (recommended): Cn_window