Google details how it’s improved Portrait mode on the Pixel 4
Portrait modes that simulate the shallow depth of field of a large sensor camera and fast lens have been around on smartphones for a long time. The Pixel 2 was the first Google phone to offer the feature. With the Pixel 2 being a single-lens camera the dual-pixel autofocus system was used to estimate the parallax and thus depth. The Pixel 3 still relied on dual-pixels but the system was improved using machine learning.
 |
| The Pixel 4 is the first Google phone to use dual-pixel AF and dual-cameras combined for depth estimation. |
The latest Google flagship, the Pixel 4, is the first phone in the Pixel line to feature a dual-cameras. This allows for even better depth estimation by leveraging both the dual-camera and dual-pixel auto-focus system. In addition Google has also improved the appearance of the bokeh, making it more closely match that of a large sensor DSLR or mirrorless camera.
With the dual-pixel autofocus distance between the two focus pixels is very small which makes it difficult to estimate depth further away from the camera. The Pixel 4’s dual-cameras are 13 mm apart, allowing for a larger parallax and making it easier to estimate the depth of objects at a distance.
...dual-pixels provide better depth information in the occluded regions between the arm and torso, while the large baseline dual cameras provide better depth information in the background and on the ground.
Google is also still using the information collected by the dual-pixels, though, as it helps refine depth estimation around the foreground subject. In addition machine learning is used to estimate depth from both and dual cameras. A neural network first processes data from the two separately into an intermediate representation. A final depth map is then computed in a second step.
 |
| This image shows depth maps generated from dual-pixel AF, dual-camera and both combined. Dual-pixels provide better depth in the areas visible to only one camera, dual-cameras provide better depth in the background and ground. (Photo: Mike Milne/Google) |
In addition to the improved depth estimation spotlights in the background are now rendered with more contrast, making for more natural looking results. This is achieved by blurring the merged raw image produced by the HDR+ processing and applying tone mapping.
Additional depth map samples can be found here, head over to the Google Blog for the full article.
|
|
|
|
|
Dec 14, 2020
|
Dec 11, 2020
|
Jan 14, 2021
|
Jan 14, 2021
|
The Insta360 One R is a unique action camera: it has interchangeable camera modules, including one with a large 1"-type sensor and a Leica lens. We show you how it works and ask, 'who's it for'?
Exposure X6 is the latest Adobe Lightroom competitor from Exposure Software. With great image quality, impressive speed and powerful features, it's a compelling option that doesn't require a monthly subscription.
Sigma's 35mm F2 DG DN designed specifically for mirrorless cameras is a compact, well-built lens that produces lovely images. Is it a good fit for you? Find out in our field review.
US manufacturer Really Right Stuff just released a new lightweight travel tripod, aimed at active and weight-conscious photographers that don't want to compromise on quality. Does its performance justify its high price? Find out in our initial review.
Fujifilm's latest X-S10 is a likeable mirrorless camera with some of the company's best tech packed inside, and it doesn't cost the earth. We think it could be a good fit for photographers of all kinds – find out more in our full review.
Whether you make a living out of taking professional portraits, or are the weekend warrior who knows their way around flashes and reflectors, you'll want a camera with high resolution, exceptional autofocus and a good selection of portrait prime lenses. Click through to see our picks.
What's the best camera for shooting landscapes? High resolution, weather-sealed bodies and wide dynamic range are all important. In this buying guide we've rounded-up several great cameras for shooting landscapes, and recommended the best.
What’s the best camera costing over $2500? The best high-end camera costing more than $2000 should have plenty of resolution, exceptional build quality, good 4K video capture and top-notch autofocus for advanced and professional users. In this buying guide we’ve rounded up all the current interchangeable lens cameras costing over $2500 and recommended the best.
What's the best camera for travel? Good travel cameras should be small, versatile, and offer good image quality. In this buying guide we've rounded-up several great cameras for travel and recommended the best.
There are a lot of photo/video cameras that have found a role as B-cameras on professional productions or A-camera for amateur and independent productions. We've combed through the options and selected our two favorite cameras in this class.
Comments