Will you take a 3D VR panoramic video? This article may help you

In recent years, VR video is getting more and more popular. Various VR welfare agencies, VR rice 18 network, Blu-ray mobile app website, VR video content is also provided with the arrival of the new spring, and numerous VR data have sprung up. VR games are also promising. "Biochemical 7" has been widely supported by the public since its official release. Although the first-person game immersion is daunting, good games are like this! Similarly, the "Star Trek VR" version, which everyone is looking forward to, was originally planned to be launched at the end of last year. Officially, the game will be released simultaneously on the PlayStaTIon VR, HTC Vive and Oculus platforms. Recently, it has been reported that it will be postponed until this year. It was announced on the 14th of the month and it is said to be in line with the film. Ok! Good things always have to be left to the end.

Xiaobian does not talk about resources today, simply talk about technical practice, haha. If you have the opportunity to discuss it privately, this is not the point. If one day you learn to return, you should remember to share the practical experience of shooting, and we will give you a price reward according to the contribution.

One is through VR panoramic camera, which is light, convenient and easy to operate. The captured VR video can be directly output, but limited by the hardware performance itself, the video frame rate and code rate are not completely satisfactory nowadays;

Another way is to shoot by multi-machine combination, which is a GoPro series camera, which can form 6x, 8x, 10x, 12x, 14x any even pairs of camera groups, 360 degree wraparound panoramic picture shooting, and through the late fight Post software for video stitching synthesis. In theory, the more the lens machine is combined, the greater the coincidence of the collage, and the less obvious the visual difference effect. So far, the more common way is to use 6 sets of cameras for interactive arrangement.

In November 2014, Samsung Electronics launched a creative 3D VR panoramic camera Project Beyond, developed by the Samsung Think Tank team. This panoramic camera like a flying saucer can be used to make a Samsung Gear VR headset. The displayed VR content.

Samsung called Project Beyond "the world's first true 3D effect 360-degree camera" with 16 high-definition cameras that can capture 1 billion pixels of 3D images per second. With Project Beyond, Gear VR users can “move to certain locations in an instant and watch the events they want to watch”.

According to members of the Think Tank team, Project Beyond uses stereo interlacing and 3D stitching to capture scenes in a human-like manner, but the content is greatly compressed. Project Beyond can play events in real time, as well as save data for future viewing.

Project Beyond's 16 cameras are mounted around the flying saucer in a wraparound manner. Each camera is responsible for shooting at a 45-degree angle. The camera has a powerful processor and memory array that can simultaneously process images from 16 cameras. Information and stitch them into real-time 360-degree panoramic video. Similarly, you can also take a 3D image by pressing the shutter and upload it to the Gear VR via a mobile app or wireless network for viewing.

Project Beyond uses 16 cameras inside, which are surrounded by a camera 2 * 8 and a 45-degree angle.

As shown in the above figure, each triangle corresponds to the left eye or the right eye in front of people's field of vision. There are 16 lenses in a circle, 8 lenses form the panorama of the left eye, and the right eye panorama consists of 8 lenses. Stitching, the final result is 2 panoramas, respectively for the left and right eyes.

Samsung Project Beyond internal component structure diagram

Similar 3D VR panoramic camera: The entry-level Samsung Gear360, with a spherical body structure, is equipped with two high-definition cameras, which can perform panoramic camera with 30 megapixel resolution and 4K video capture. Gear360 is a civilian-grade panoramic camera, and the price of around 3,000 yuan is also very affordable.

Samsung Gear360

In addition, other popular VR panoramic camera brands, including: Insta360, integrated VR camera Upano XONE, washbasin independently developed Surrond 360, film and sound level Upano J2VR...

Multi-camera shooting panoramic VR video is also a popular method at present. Here we use 6 independent GoPro cameras as an example to explain the process principle of VR 360-degree panoramic shooting.

In this shooting scheme, GoPro needs to set parameters for each camera before shooting, especially the frame rate must be the same. Secondly, it is recommended to ensure that the auto functions of the GoPro camera are turned off and all are manually set. After setting, all cameras can be turned on manually or through the remote control.

In panoramic shooting, most of the monopod is used to place the camera, avoiding the use of a larger tripod to prevent the camera tripod from being captured into the panoramic video, destroying the overall effect of the virtual reality. During GoPro shooting, you also need to pay attention to the problem of video synchronization. Because GoPro cameras work independently, it is impossible to achieve full synchronization. Therefore, in video shooting, it is necessary to use a relatively obvious mark to record a certain part of the video so that Picture synchronization can be performed quickly during post processing. The specific method is that after all the cameras are turned on, they slap the palms in different directions of the camera so that the video recording can be quickly matched in the post collage. Another method is to quickly rotate the camera and synchronize through the video screen. .

A similar GoPro combination shot, very representative of Google and GoPro jointly launched Odyssey, is also a product for professional photographers, its predecessor is the famous Jump.

Odyssey related performance parameters

The 16 GoPros work together with each other to make GoPro work in different orientations. The angle of view of each camera coincides with the angle of view on both sides. This allows Odyssey to filter and combine the information of the angle of view to form a "close" Spherical 360° panoramic video.

The video capture technology can be used to increase the resolution of Odyssey to 8k 30 frames. The 2k x 2k panoramic MPEG4 video bit rate is 150Mbit/s, and the 8k x 8k panoramic MPEG4 video bit rate is 600Mbit/s. Of course, in addition to using GoPro's battery, you can also record video for a long time via an external power supply.

GoPro Omni is also a very good VR 360 panoramic camera, integrated with 6 custom Hero4 Black sports cameras, and can simultaneously capture 360-degree 8K HD panoramic video through 6 cameras. The built-in processor can also automatically generate 6 videos in a collage and directly generate video, so it is very easy to operate. It is an inexpensive model for commercial and professional film and television professionals.

GoPro Omni panoramic camera with 6 custom Hero4 Black combinations

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