Text/Vanilla Media CEO Chai Fu As an old driver who has fought for more than a year in the field of panoramic content, he has experienced too many pits. Recently, a lot of friends have switched to this field and asked me what kind of camera to buy. I have too many projects now, and I have no time to answer them in detail. So write this article, do not know how to read it. To put it plainly, the key to buying a panoramic camera is to look at the following five points. Everything else is cloud. 1, clarity The video recording function of at least 4K resolution ensures that the footage can output 4K resolution video after the clip is stitched in the later stage. Why is 4K? We use mainstream VR glasses with mainstream mobile phones as an example. The field of view of the glasses is 100 degrees, the resolution of the mobile phone is 1920×1080, and the number of horizontal pixels after the split screen is 960. According to the spherical projection approximation, each angle needs to be filled with 10 pixels, 360 degrees. You need 3600 pixels. The 38401920 resolution 4K video can meet this need. On the hardware side, as the performance of mobile phones and VR glasses improves, the video resolution requirements will also increase. However, considering that the mainstream H264-encoded video format can only support 4K resolution video, and the mainstream mobile phone has limited decoding capability for higher resolution video, higher-level video recording does not have much in the short-term under normal scenarios. Practicality. At present, binocular panoramic cameras on the market, if the nominal monocular video capture resolution is up to 4K (38402160), the monocular can generally output an inscribed circle with a diameter of 2160 pixels, and the binocular video combined output can reach 43202160, but This type of video has a low utilization rate for the entire frame of pixels (ideally only 78.5%) and taking into account the video reclosing rate, the image quality loss caused by image edge distortion, the actual spliced ​​video pixels can only reach The 3K level can only meet the needs of the panoramic preview of the mobile phone and cannot meet the real VR head-mounted viewing requirements. 2, node deviation At present, the mainstream post-splicing solution in the industry uses AVP, NUKE and other professional video splicing software for automatic splicing, template splicing and manual splicing. The success rate of software recognition and the difficulty degree of manual splicing are largely related to the deviation of camera hardware nodes. The common multi-god Gopro assembly machine and multi-lens SLR assembly machine have large node deviation due to the size limit of the monocular body, which makes the close-range stitching difficulty increase steeply. Another problem with node misalignment is the safety distance (blind area), which makes the shooting scene further limited. If more camera combinations are used to increase the video reclosing rate in order to reduce the safety distance, more stitching will be introduced. The gap is very difficult later. As the node deviation is unavoidable, more shots mean more joint processing and more complicated post processing. As a result, multi-head assembly machines on the market are not preferred to professional content production teams. 3, quality Although everyone is pursuing the SLR level, as far as the current situation is concerned, several SLRs have been combined into one panoramic camera. First of all, you cannot get the above-mentioned node deviation. Of course, there are luxury late stitching team, minutes can pick up tens of thousands can ignore my advice. At present, it is recommended to use Gopro's image quality as a benchmark. Below the level of Gopro, you can buy an entry-level study. If you can't use it for work, you have to look at the sky. In particular, pay attention to noise in low light conditions, and exposure problems in large light ratio scenes. This is mainly to look at the sample, all camera factory can not take samples, is a rogue. Of course, the fraud technology is also high now. What kind of samples you see is taken by the machine and it is not accurate. It is best to make real shots on the spot. 4, controllability Manually adjustable shutter and ISO This is the basic requirement. Of course, multi-lens synchronization exposure, metering mode is optional, these have better. In short, there is controllability to deal with some complex scenarios and ensure that all important details are recorded. In addition, for content with storylines, it is necessary to preview in real time and avoid blind shots. 5, price This seems to be nonsense. But I still talk about it. At present, the most cost-effective professional camera is based on the Anba scheme, and the typical representative is a plurality of Gopro assembly programs. Of course, an All-in-One solution based on the Anba, multi-head assembler that sells for less than the same amount of mesh, is regarded as a big deal. Finally, I would like to talk about the two shortcomings of all the panoramic cameras (not counting hundreds of thousands of them, which we can't afford). We must be psychologically prepared before starting. 1, latitude Panoramic shooting is very easy to encounter the environment of large light ratio, which puts higher requirements on the camera. In other words, the tolerance of the panoramic camera should be higher than that of a normal flat camera. However, at present, the slight improvement in latitude means that prices have greatly increased. A high latitude panoramic camera, such as Nokia OZO, is still a few hundred thousand, and the reeling team is dead. 2, stability The panoramic camera has more system power consumption because it needs to collect more image information, and the existing camera design considers reducing the node deviation and also makes the camera size as small as possible, which makes the camera heat become a problem. . Therefore, a camera that is turned on for a long time can be used as a hand warmer, and the stability can be imagined. Therefore, it is not recommended that you shoot more than half an hour continuously. At the end of the day, as a senior VR pitter, it's hard to bear to see everyone jumping up and down. Since the end of last year, our team has started its hard work, consulted countless expert cattlemen, and used the accumulated R&D and production resources in this life. Finally tossing out a panoramic camera that can work, looking like a Rubik's Cube, hence the name Rubik's Cube. .wxdigi { padding:20px 0; border-top: 1px dotted DBDBDB; } KNL5-100 Residual Current Circuit Breaker
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