When it comes to capturing depth of field information, I believe that many students think of the 3D structured light technology used on OPPO Find X. It is also the first support for face payment in Android. Security level mobile phone.
However, friends who are concerned about related fields will also find that the TOF technology that has measured the depth information through time difference has recently emerged. With its characteristics, cost and mass production advantages, it has gained a high degree of attention in a short period of time. Of course, OPPO will not miss the technology. In other words, OPPO has already made a good position in TOF technology. Now it is ready for everything, only to owe a new machine to commercial level.
Nowadays, the solutions for obtaining depth information on the market can be divided into three categories, namely binocular scheme, 3D structured light scheme and TOF scheme. Among them, binocular scheme is the most familiar to us, and the mobile phone rear dual camera adopts this scheme. Using the parallax of two angles of view to calculate the depth information of the object, in principle, it is similar to the three-dimensional image that we see by both eyes, but because of the limitations of camera accuracy, computational difficulty, and dark-light scene recognition ability, the practical application of the binocular scheme is affected. The limit is very large, and it is generally used in the relative position recognition, which is mainly the background blur that we use.
3D structured light schemes We have already learned a lot on Find X, which involves three kinds of solutions, such as structural shifting, structure coding and phase shifting stripe, but the final principle is to compare and send and receive optical information. The change, to reverse the depth difference caused by the change, thereby restoring the overall depth information. It is characterized by high precision of the depth information, and because it emits a laser light source itself, it can also be used in a dark environment, but because the shift is far away The degree of polymerization will be greatly different, and the working distance is generally limited to between 0.2m and 1.2m.
The TOF scheme and the 3D structured light are both solutions using an active laser source. The TOF calculates the time difference and depth information by recording the phase difference between the emission and reception of the laser. The advantage is that the working distance is farther and the same applies to the dark. Light environment.
Of course, there are also many problems to be solved in the process of landing the TOF program. For example, in order to minimize the influence of infrared rays on the emitted light source in the environment, OPPO chose to use a 940 nm wavelength infrared light source, and also added a center at the receiving end. The narrow-band filter with a wavelength of 940nm ensures that the interference caused by ambient light is minimized during the propagation and at the final acceptance stage. The infrared wavelength of 940nm is chosen here because 0.89~0.99μm is a strong water vapor absorption band for infrared rays. 940nm is a peak of absorption. In the natural environment, the infrared rays of the corresponding bands are less, which has the least influence on the infrared light information used by TOF.
In terms of application, combined with the characteristics of related technologies, OPPO believes that the front-end is more suitable for using higher-precision 3D structured light to solve the user's needs for face payment, 3D beauty, and TOF with a longer working distance. There will be better room for the placement. OPPO has a certain plan in 3D prototyping, AR decorating, AR games, somatosensory games and holographic image interaction. Of course, it is suitable for the post-stage mainly TOF at short distance. There is still a certain gap between the accuracy of the internal and the 3D structured light. If the TOF accuracy is further developed in the future, it is not an absolute limit when used in the front or the rear.
Using products to circle powder, from the 3D structure light on Find X to the current TOF program, OPPO's enthusiasm and forward-looking nature are obvious to all. We have layout in the 3D field before and after, and we continue to pay attention and input in 5G. To realize its own 3D+5G ubiquitous vision, OPPO has already gone a lot farther than others. Maybe in the next generation of products, we can feel some new experiences.
When it comes to capturing depth of field information, I believe that many students think of the 3D structured light technology used on OPPO Find X. It is also the first support for face payment in Android. Security level mobile phone.
However, friends who are concerned about related fields will also find that the TOF technology that has measured the depth information through time difference has recently emerged. With its characteristics, cost and mass production advantages, it has gained a high degree of attention in a short period of time. Of course, OPPO will not miss the technology. In other words, OPPO has already made a good position in TOF technology. Now it is ready for everything, only to owe a new machine to commercial level.
Nowadays, the solutions for obtaining depth information on the market can be divided into three categories, namely binocular scheme, 3D structured light scheme and TOF scheme. Among them, binocular scheme is the most familiar to us, and the mobile phone rear dual camera adopts this scheme. Using the parallax of two angles of view to calculate the depth information of the object, in principle, it is similar to the three-dimensional image that we see by both eyes, but because of the limitations of camera accuracy, computational difficulty, and dark-light scene recognition ability, the practical application of the binocular scheme is affected. The limit is very large, and it is generally used in the relative position recognition, which is mainly the background blur that we use.
3D structured light schemes We have already learned a lot on Find X, which involves three kinds of solutions, such as structural shifting, structure coding and phase shifting stripe, but the final principle is to compare and send and receive optical information. The change, to reverse the depth difference caused by the change, thereby restoring the overall depth information. It is characterized by high precision of the depth information, and because it emits a laser light source itself, it can also be used in a dark environment, but because the shift is far away The degree of polymerization will be greatly different, and the working distance is generally limited to between 0.2m and 1.2m.
The TOF scheme and the 3D structured light are both solutions using an active laser source. The TOF calculates the time difference and depth information by recording the phase difference between the emission and reception of the laser. The advantage is that the working distance is farther and the same applies to the dark. Light environment.
Of course, there are also many problems to be solved in the process of landing the TOF program. For example, in order to minimize the influence of infrared rays on the emitted light source in the environment, OPPO chose to use a 940 nm wavelength infrared light source, and also added a center at the receiving end. The narrow-band filter with a wavelength of 940nm ensures that the interference caused by ambient light is minimized during the propagation and at the final acceptance stage. The infrared wavelength of 940nm is chosen here because 0.89~0.99μm is a strong water vapor absorption band for infrared rays. 940nm is a peak of absorption. In the natural environment, the infrared rays of the corresponding bands are less, which has the least influence on the infrared light information used by TOF.
In terms of application, combined with the characteristics of related technologies, OPPO believes that the front-end is more suitable for using higher-precision 3D structured light to solve the user's needs for face payment, 3D beauty, and TOF with a longer working distance. There will be better room for the placement. OPPO has a certain plan in 3D prototyping, AR decorating, AR games, somatosensory games and holographic image interaction. Of course, it is suitable for the post-stage mainly TOF at short distance. There is still a certain gap between the accuracy of the internal and the 3D structured light. If the TOF accuracy is further developed in the future, it is not an absolute limit when used in the front or the rear.
Using products to circle powder, from the 3D structure light on Find X to the current TOF program, OPPO's enthusiasm and forward-looking nature are obvious to all. We have layout in the 3D field before and after, and we continue to pay attention and input in 5G. To realize its own 3D+5G ubiquitous vision, OPPO has already gone a lot farther than others. Maybe in the next generation of products, we can feel some new experiences.
