Jitter is the natural enemy of video. In addition to the jittery effect created by the action movie to create a sense of tension and speed, the video image is still stable. So, as long ago as photography technology, "how to make the camera stable" is a topic that does not stop.
Anti-shake is still a cutting-edge technology until today, but it is different from the professional imaging industry. It has a relatively fixed anti-shake concept. A series of non-traditional video recording equipment such as mobile phones, handheld gimbals, sports cameras and panoramic cameras are used in the consumer field. The appearance of anti-shake technology has also begun to diversify, and even AI has been "transformed" by Huawei to become an anti-shake algorithm.
Today, Fanfan (micro-signal: ifanr) has come to give a simple inventory of various mainstream consumer-level image stabilization technologies. What kind of effects can be achieved in the future of mobile video shivering depends on these new technologies.
Algorithm anti-shake sender: Problems that can be solved with code are not problems
"Labour and Finance" is very suitable to describe upgrading the mobile phone's photography capabilities through hardware upgrades.
In the extremely limited space of the fuselage, larger photosensitive elements, larger optical image stabilization modules, or increased cell phone development and production costs, or will make the phone thicker and larger. Moreover, the optical image stabilization module can only enhance the stability of the photographing. In the face of greater camera shake during video shooting, the optical image stabilization technology of the mobile phone is still temporarily incapable of action.
Thus, software engineers known for writing code try to use algorithms to save distressed hardware engineers and provide electronic anti-shake that does not lose optical image stabilization for phones that are not capable of anti-shake.
Electronic anti-shake uses the characteristics of the current mobile phone camera generally equipped with high-resolution and wide-angle lens, pre-screening the picture properly when shooting video, using only part of the sensor frame. Of course, the rest of the frame is not idle and has nothing to do. Instead, it is a necessary “backup” frame for electronic image stabilization technology. Even if the camera is shaken, the redundant frame can become an effective frame, according to the mobile phone gesture recorded by the gyroscope. The data compensates the camera's jitter in reverse and maintains the stability of the video.
The algorithm-based electronic image stabilization can be said to be a major innovation in the R&D team of cell phone cameras. Even low-cost mid- and low-end phones can now have video stabilization, as long as they do not exercise vigorously with their phones. The availability of electronic image stabilization not bad.
However, the video stabilization achieved by the algorithm also has a great limitation. Due to the need to cut off a part of the frame to provide anti-shake algorithm to use, accordingly the video screen finally presented to the user is also a certain proportion of cropping, and can not fully display the wide field of view of the wide-angle lens. I could have shot a long-legged camera. I can only shoot half-length video after switching to video mode. I believe many people have already wondered about this in their own camera app.
Anti-shake algorithm is not the best anti-shake technology for mobile video shooting, but at the same time taking into account the anti-shake effect, hardware cost and portability, algorithm anti-shake is indeed an equivalence anti-shake technology in all aspects.
PTZ anti-shake sender: "Non-shaking" is the best anti-shake
The camera needs anti-shake because the camera shaking also drives the camera. If the camera is fixed on a tripod, then strong anti-shake technology will not be used, because the camera does not shake at all.
Therefore, some video accessories manufacturers have taken the initiative to transform the Steine Nikon and three-axis stabilizers that have already been applied to professional cameras into light and compact mobile phone gimbals. Currently, the average selling price of mobile phone PTZs from major brands such as Dajiang and Feiyu has dropped significantly to less than RMB 1,000. More and more users with heavy video shooting needs (such as technology media counterparts) use mobile phone PTZ as their own video. Stabilize anti-shake.
The principle of anti-shake for mobile phone PTZ is actually very simple.
All standard mobile phone desks, without exception, have three axial motors X, Y and Z. Their mutual cooperation can provide mobile phones 360-degree rotation capabilities.
Under the calculation of the built-in algorithm of the PTZ, the PTZ can determine the strength of the motor needed to drive the rotation of the phone according to the weight of the mobile phone, and at the same time constantly detect the jitter or rotation of the handle part, and compensate the partial shaking of the offset handle by the reverse rotation of the motor. The effect of the camera screen. In some modes of operation, the motor also provides a buffered rotation in the same direction to the rotation of the handle portion, making the rotation of the lens smoother and smoother.
Since the application of mobile phone photography, the stabilizer of similar principle is already a must-have anti-shake tool for professional videographers, and we do not need to question the anti-shake effect of the mobile phone pan/tilt. Since the mobile phone platform can isolate the jitter from the mobile phone, the electronic anti-shake function of the mobile phone itself has no need to be started, and the field of view of the wide-angle lens can be fully utilized to improve the texture of the video shooting. Some handheld gimbal apps even provide digital zoom for mobile phones.
However, at the same time as miniaturization, some features of the PTZ have turned into disadvantages that mobile phone users may not accept.
The volume and weight are the first and foremost, even if it is a light mobile phone platform, the volume in the carrying case is as large as several mobile phones. Professional photographers do not care too much about adding auxiliary equipment to obtain stable images, but consumer users are very concerned. Unlike professional photographers, consumer-level users have self-photographing requirements. Even if the mobile phone platform can maintain its stability under strenuous exercise, its size will become more and more burdensome in the self-timer.
Even if the handheld PTZ makes the mobile phone weatherless, users will still miss a little jitter, but do not need to bring a simple package to go out of the simple experience.
Panorama anti-shake sender: both portable and wide-angle, this is not satisfied?
There is no wide-angle mobile electronic anti-shake is very portable, hand-held head with a wide angle is not portable, at first glance these two demands seem to be irreconcilable contradiction, but there are companies targeting the middle ground.
Since about 2016, panoramic cameras have emerged. After various camera manufacturers have successively improved the quality of panoramic cameras and the quality of front and rear shots, image stabilization has become another key breakthrough technology for panoramic cameras.
The anti-shake of a panoramic camera has a natural advantage - perspective. Because the panoramic camera does not record a certain angle of view, but a 360° angleless screen, the pose of the camera itself is not directly related to the final frame. As long as the camera is exported at a later stage, the camera can provide the pose for shooting. Data, the software can automatically calibrate the level. If you use the data further and calibrate the picture while shooting, it is almost perfect electronic anti-shake.
Recently, Insta360 launched its anti-shake technology called "FlowState" for its own ONE panorama camera. It uses the gyroscope built into the Insta360 ONE to measure attitude data and real-time correction and compensation of video frames. Due to the large range of image stabilization, even with Insta360 riding, running, and participating in extreme sports, the anti-shake effect will not change much due to the intensity of the movement. You can feel the stabilizing effect of FlowState in the video at the beginning of this article.
In addition, with the FreeCapture editing function in the official app, Insta360 ONE can output a small amount of video that is more stable than the mobile phone and the handheld head, and can freely switch the lens view angle.
The panoramic camera also has an unparalleled advantage of the head and mobile phone - scalability. Most of the panoramic cameras have 1/4-inch standard tripod mounts on the bottom of the fuselage. With some loading accessories, we can easily mount the panoramic camera on a tripod, bicycle, chest, head and even drone. Even a lightweight sports camera is difficult to handle good images, and panoramic cameras can be easily implemented.
Video anti-shake has its own advantages, technology integration is the trend
The three major mobile phone and panoramic video anti-shake technologies just introduced have their own advantages and disadvantages. The current cost and technology maturity have reached a level that is well adapted to the consumer market environment.
Ai Faner has no intention of separating them from each other. In fact, whether it is the video electronic image stabilization provided by the mobile phone or the electronic image stabilization adopted by the panoramic camera, it is a very practical technology under the respective usage scenarios. . Therefore, we are looking forward to more and more people willing to pick up these cost-effective shooting devices and leave a smooth and smooth image record for the future.
If emerging consumer-level image stabilization technologies are used on a large scale, manufacturers will also have more incentive to develop more innovative anti-shake technology.
It is understood that Insta360 will launch a low-cost mobile phone add-on lens in June, which can use the front and rear camera of the mobile phone to capture composite panoramic images, and even be compatible with FlowState anti-shake technology. Perhaps the use experience of this accessory will be different from that of an independent panoramic camera. The real significance of this accessory is to provide consumers with a choice of electronic image stabilization and easy viewing that do not want to buy one more camera and envy the panoramic camera.
People’s pursuit of camera-shake stabilization has never stopped since the birth of cameras and movies. The outbreak of hardware and software technologies such as artificial intelligence and high-resolution sensors has added more possibilities for the implementation of image stabilization technology. The threshold for shooting stable video will only get lower and lower, and the anti-shake technology between different shooting products may also realize cross-platform integration.
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