IOS version of the Micro-trust Circle recognition Picture location information how to achieve? _ios

One feature of the iOS version of micro-mail: When you send a photo in a friend's circle, you can show the location based on where the photo was taken. News, netizens have started to try new features of the play.

When uploading pictures in the micro-trust circle, the location of the photos can be automatically identified by the click position.

In the past when we send friends, we can display their location information, and now automatically read the location of the photo shoot many people associate with the image recognition technology. In fact, the micro-letter is not so complicated, there are insiders told Lei Feng network new functions based on the location of the picture information (that is, EXIF GPS positioning information) to achieve.

What is EXIF?

Exif (exchangeable image file) is a format for image files, which was first developed by the Japan Institute of Electronics and Information Technology (JEITA) to set a standard for camera camera manufacturers.

Now, any photo taken by a cellphone has a set of EXIF parameters, in addition to the pixel information, Exif includes aperture, shutter, white balance, ISO, focal length, date and time, and other image information as well as camera brand, model, color coding, recorded sound during filming, as well as GPS Global Positioning system data.

Theoretically, the EXIF information for each picture will remain as long as it is not specially processed.

What did the micro-mail do?

The new feature of the micro-letter is likely to call the GPS data in Exif, which comes from sensors and gyroscopes inside the phone.

In an EXIF viewer on the mobile phone photos were tested, the results show that as long as the picture is not compressed, date time, camera model, pixel and aperture shutter and other information can be recorded, and location information requires users to open the GPS to display.

As shown in the above picture, the location information that Exif covers is longitude, latitude, and elevation, and this set of data corresponds exactly to the position of the small group when taking photos. It is certain that the new function of the micro-letter resolves this set of data.

See here you should know the micro-letter is how to accurately identify the user to upload the image of the location of the shot, is not more simple than everyone imagined it?

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