retina biometrics

What is the difference between our visual system's key indicator for measuring imaging performance-resolution-and our common or commonly understood exposure devices? How are these differences affecting our webpage access behavior? The resolution of the visual system decreases sharply from the center to the edge. If we analyze the original image of spatial resolution imaging in the human visual system, we will notice that the spatial resolution of our field of vision is rapidly decreasing from th

:(Artist *)artist;// GigsViewController.m[[GigStore sharedStore] gigsForArtist:artist] subscribeNext:^(NSArray *gigs) { // Do something with gigs } error:^(NSError *error) { // :( }];It allows the combination of signals and other signals to make some changes before they are shown.Assets ResourcesAsset catalogs is the best way to manage all your project visualization resources, and they can manage common and device-related iphone 4-inch, iphone

For different Apple devices, see IOS: Model parameters, SDK, Xcode versions for each of the parameters.model ChangesCoordinates: Indicates the physical size of the screen, the coordinates become larger, indicating that the machine screen size has become larger;Pixels: Indicates the size of the screen picture, with a correspondence between coordinates, such as 1:1 or 1:2, etc.;PPI: A scale value representing the physical size of the screen to the size of the picture, and the scale of the coordina

Macro)Images taken at an extremely close distance. Macro lens (macro lens)Used to take extreme close-range images. Macula lutea)Yellow area of the retina. It is also called the central concave area of the retina, which can produce the clearest vision. Magic light)See "golden time ". Half portrait (midrange portrait)The portrait taken from the same distance generally includes parts above the middle thigh of

Samsung's Galaxy S, began to catch up with the iPhone 3gs user experience, the iPhone 4 was born, and the Retina screen again shocked the world, this is an idea that IBM has proposed many years ago, but Apple has implemented it. In this regard, Apple has been ahead of Android for about two years, android had a p Retina screen until the end of last year. 4 S Siri can only be said to be a semi-finished pro

don't understand medial queries? We recommend that you first click here to understand. and medial queries in responsive play a very important role, can say responsive design left medial queries lost his survival significance. Simply said medial queries is a media query, you can query the appropriate style according to the size of the set. We look back to the responsive design is the most concerned about the width: Depending on the user's current width of the device, your Web page will load an a

Original from Https://hashnode.com/post/how ... In most cases, developers need to use and query JSON data from other services. Querying JSON documents is time consuming. In the past few days, I was writing a package for Golang to easily query JSON data. This idea and inspiration comes from Nahid Bin Azhar's Php-jsonq. Let's look at a sample JSON data: { "name":"computers", "description":"List of computer products", "vendor":{ "name":"Star Trek", "email":"info@example.com", "

products, has been described as a variety of schools, flowers.Second, the mainstream augmented reality glasses to achieve technical means 1, transparent displayEpson MOVERIOBT-200 Smart GlassesMost of the smart eyewear products based on Google Glass are mainly transparent display technology, unlike Google Glass glasses, Epson Moverio BT-200, although also using transparent display technology, but the difference is that it has embedded a transparent display on two lenses , so it can form a 3D st

First, point Vs PixelIn iOS, when we use frames such as quartz,uikit,coreanimation, all coordinate systems are measured by point. The system will help us deal with point-to-pixel conversions when actually rendering to settings.The benefits of doing so isolate the change, i.e. we do not need to focus on whether the current device is retina after the layout, and can be laid out directly in a set of coordinate systems.In practice we need to keep this in

Spit Groove:With now more and more people pack B, especially some product managers.Now also in the new laptop, Apple's notebook is a B weapon (especially Retina Pro).Recently encountered a colleague of the project, or as usual as a small eager figure, seriously on the pixel.All the tests were no problem and went online.However, after the launch, the product manager ran over to say that there was a bug.Bug Description:(not considered a bug)The icon on

iOS Learning Day1Uiwindow->uiviewcontrol->uiviewUIScreenWrite Project Method:1.storyBoard2.xib file3. Pure CodeApple Phone Size/*IPhone4 3.5 "is not a Retina screen 32-bit system 320x480Iphone4s 3.5 inch Retina screen 32-bit system 640x960IPHONE5/5C 4 inch Retina screen 32-bit system 640x1136IPhone5S 4 inch Retina scre

For different Apple devices, see IOS: Model parameters, SDK, Xcode versions for each of the parameters.model ChangesCoordinates: Indicates the physical size of the screen, the coordinates become larger, indicating that the machine screen size has become larger;Pixels: Indicates the size of the screen picture, with a correspondence between coordinates, such as 1:1 or 1:2, etc.;PPI: A scale value representing the physical size of the screen to the size of the picture, and the scale of the coordina

queries is very simple, you can create some common templates for responsive, for example: @media only screen and (min-width:320px) {/* Small screen, Non-retina/} @media only screens and (-webkit-min-devi Ce-pixel-ratio:2) and (min-width:320px), only screens and (Min--moz-device-pixel-ratio:2) and (Min-width:3 20px), only screens and (-O-MIN-DEVICE-PIXEL-RATIO:2/1) and (min-width:320px), only the screen and (Min-devic E-pixel-ratio:2) and (min-width:

, the machine is very portable. And the machine is equipped with the retina display, and the battery lasts for 10 hours, and the use of very low power core M processor, is ideal for frequent business trip to the performance requirements of friends to use. At present, the new MacBook 256GB capacity version of the Apple website quotes 9288 Yuan, 512GB version of 11288 Yuan, while in the Amazon Chinese prices compared to Apple's top 500 discount on the o

. Aligning the vector tool with the transform to the pixel grid It is highly recommended that this feature be turned on so that you do not produce a half pixel virtual edge, which is very useful. However, it can be temporarily closed when micro adjustments are required. 　　Text Settings Font I usually set the font to sharp, if you are Photoshop cc version, it has a Windows Lcd/mac LCD anti-aliasing, text can be as effective as the Web page, so it is recommended to upgrade to Photo

What is a responsive picture?A responsive picture is a user agent that loads different types of images according to the resolution of the output device, without causing a waste of bandwidth. At the same time, when changing the output device type or resolution, the corresponding type of picture can be loaded in time.CSS3 Responsive PictureFor many IOS developers, it may be a little strange to fit the Retina screen, the traditional CSS3 implementation i

Contentsscale property is actually part of the support for high resolution (Retina) screen mechanism, which is used to determine the space that should be created for the homestay map when the layer is drawn, and the picture stretching that needs to be displayed (assuming that the contentsgravity attribute is not set). UIView has a similar function but is rarely used for contentscalefactor properties.If Contentsscale is set to 1.0, the picture will be

model ChangesCoordinates: Indicates the physical size of the screen, the coordinates become larger, indicating that the machine screen size has become larger;Pixels: Indicates the size of the screen picture, with a correspondence between coordinates, such as 1:1 or 1:2, etc.;PPI: A scale value representing the physical size of the screen to the size of the picture, and the scale of the coordinates and pixels will not change if the PPI is not changed; iphone 4 iphone, iphone3/3g models do

IPhone 1/3g/3gs 480*320 IPhone 4/4S 960*640 3.5 inch screen 326ppi pixels IPhone 5 1136*6404 inch screens326ppi pixels IPad 1/2 1024*768 9.7 inch132 PPI IPad 3 (new pad) 2048*1536 246ppi pixels -If you want to display your high score images on the new iPad, you must use xcode 4.3.1 together with the IOS 5.1 SDK! 2. Application icons The next step is to create a high-score version for the app's main icon, because the low-score icon looks terrible on the new iPad desktop. To sup

First look at the eye structure: The eyes are still relatively complex, involving at least 10 of the following parts: 1. cornea, a hard and transparent tissue in front of the eyes, protects the eyes. 2. sclera. The surface outside the cornea is enclosed by sclera. 3. choroid, which contains vascular network, provides nutrients for the eyes. 4. The mascara body (ciliary body) is located at the anterior part of the target, and the fiber above it is responsible for suspension of the lens (le