Mobile Phone Forums
Welcome to the Mobile Phone Forums

Go Back   Mobile Phone Forums > Mobile Phones > Extras
Register FAQ Mark Forums Read

Extras Discussion of Ringtones, Games, Software, Avatars, Graphics, Wallpapers, Unlocking etc.

Reply
 
Thread Tools Display Modes
  #1  
Old 04-08-2020, 8:31 PM
darrveny darrveny is offline
Member
 
Join Date: Jun 2020
Posts: 86
darrveny is on a distinguished road
Google explains how the Live HDR+ feature on the Pixel 4 and 4a works

The new Pixel 4a supports Live HDR+ and Dual Exposure, features first introduced with the Pixel 4 (note that these won’t be backported to older devices). The tech giant published a detailed blog post explaining how the two features work.

First, what is Live HDR+? It shows a real time preview of what the final HDR+ photo will look like. Note that this is just a preview derived using a different algorithm. The real HDR+ takes 3-15 underexposed photos (to reduce noise), aligns them and merges them. After the merge, tone mapping is applied to produce the final photo where details in both highlights and shadows are visible. The phone computes a 2D histogram to achieve that, which is interesting to see.

However, current mobile chipsets don’t have the computational power to do that 30 times per second. Instead, a dash of AI is used. The image is sliced into small tiles and the AI predicts the tone mapping for each of them. Then every pixel on the viewfinder is computed as a combination of the tone maps from the nearest tiles. Here’s a comparison between the predicted image and the actual HDR+ result. It doesn't get it quite right, but it looks pretty close (especially since you'll be viewing this on the phone's screen).

https://pub.lucidpress.com/You-Shoul...-Left-download

https://pub.lucidpress.com/Artemis-F...movie-download

https://angel.co/company/peninsula-2...movie-download

https://angel.co/company/legacy-of-l...movie-download

https://angel.co/company/the-old-gua...movie-download

https://pub.lucidpress.com/Peninsula...movie-download

https://pub.lucidpress.com/Legacy-Of...movie-download

https://pub.lucidpress.com/The-Old-Guard-movie-download
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


All times are GMT. The time now is 1:46 PM.


Powered by vBulletin Version 3.6.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.0.0 RC6 © 2006, Crawlability, Inc.
Copyright ©2015 PhoneForums.org