As the iPhone 7 is about to be released, as usual, all kinds of speculations and rumors about the iPhone 7 will spread wildly on the Internet. However, in many rumors, the iPhone 7 will adopt dual cameras basically already.
So, what has happened to the development of dual camera technology? What are the differences between the dual camera phones and the market?
Unsuccessful attempts in early years
In fact, dual-camera phones are not products that have been available only in recent years. As early as 2011, they have appeared in the market. The HTC G17, HTC EVO 3D and LG Optimus 3D are equipped with dual cameras. However, just as any technology will experience a process from new life to continuous improvement and maturation, many explorers will be disappointed before technology matures. HTC and LG played such a tragic explorer role in the past year. Although both the HTCG17 and LG Optimus 3D were equipped with two 5-megapixel cameras, they were theoretically able to directly shoot 3D photos and videos, but due to the Relatively immature, the meaning of the two cameras is far more than the actual effect, plus other factors, the two mobile phones in the market sales are not ideal.
Two different development pathsIn 2014, in addition to HTC’s obstinacy with dual cameras, Huawei also played dual cameras. Huawei Glory 6plus and HTC M8 are equipped with dual cameras, and their photo effects are somewhat better than traditional single cameras. Dual cameras have certain differences and have embarked on two different development paths.
The HTC M8 uses a primary camera and secondary camera . The primary camera is responsible for imaging, and the secondary camera is responsible for measuring the depth of field data. ZTE AXON, Redmi Pro, and HTC One M9+, released in 2015 and 2016, are typical examples of such dual camera phones.
The HTC M8 uses a 4 megapixel main camera and an auxiliary depth camera. The main camera is responsible for taking pictures. The auxiliary camera is mainly used to measure the depth of field to obtain similar light like after-focus, bokeh, and bokeh. Field camera effect. However, practice has proved that this kind of main camera + auxiliary camera has limited effect on the improvement of the picture quality, but it has a certain effect on depth effects such as background blur .
(red rice pro)
In contrast to the HTC's primary camera and secondary camera, Huawei played a bionic parallel double lens . The technology was launched by Huawei at the end of 2014 and was used for Huawei Glory 6 Plus. Compared with the main camera and auxiliary camera mentioned earlier, the Huawei glory 6Plus uses two identical 8 million-pixel cameras (the early sensors were used by OV and later by Sony), and Huawei is on its official website. The slogan is “Looking at the World with Both Eyesâ€. In the introduction, it is called a bionic parallel double lens. The dual camera technology is based on the principle of two cameras that can record panoramic deep information through the principle of triangulation. In Huawei’s publicity, Glory 6Plus phone can shoot close to the SLR level of background photos, and due to the use of bionic parallel double lens, there will be a greater amount of light, which can effectively improve the dark light, night shooting environment imaging results.
However, although the bionic parallel double lens seems to be theoretically tall, there are still some problems, such as the bionic parallel dual lens design and processing is difficult - the two cameras must be in the same plane, and the position and angle of the lens The accuracy requirements are very high; for example , the requirements for software algorithms are very high . If software algorithms are not optimized at home, then the advantage of bionic parallel dual-lens is difficult to achieve. It is precisely because of this that the technology was buried in history after the glory of 6Plus. Another dual-camera phone such as the P9 released by Huawei in 2016 uses another technology.
Relatively mature dual camera technologyCompared to these two-camera technologies that used to land mines, the black-and-white camera + color camera that came out in the second half of 2015 was a mature technology. In addition to the Leica-certified lenses, the Huawei P9 also depends on the technology. Compared to Huawei's past mobile phones in the camera performance beyond.
So, what exactly is the black and white camera + color camera?
Because the CMOS sensor can only record the light and shade and can not record the color of light, in order to take a color photo, you must add a layer of Bayer filter on the CMOS sensor. Just as the old saying has some gains and losses, after using the Bayer filter, although it can take color photos, it will damage nearly 2/3 of the amount of light, so that the noise is greatly increased in poor light conditions. The black-and-white camera uses a black-and-white sensor that can record only light and shade, that is, a CMOS sensor that removes the Bayer filter. Although this causes a camera to become color-blind, it makes the black-and-white CMOS sensor achieve nearly three times the amount of light entering the camera. In dark light conditions, it can effectively improve pixel details.
When using a black-and-white camera + color camera to take pictures, the black-and-white sensor enhances the detail capture, the color sensor is responsible for color reproduction, and the image processor synthesizes black and white and color photos, resulting in a high-resolution, color reproduction photo realistically. In particular, because the black and white CMOS sensor has a relatively high amount of light, in the dark light environment, the noise of the photos will be relatively less, Huawei P9, glory 8 and glory V8, 360 Qi cool flagship version has adopted a black and white camera + color The camera only differs in the specific model of the camera sensor used.
ISP and software algorithms are very importantAs for Apple's use of the above-mentioned program, it is still unknown. Even Apple's use of dual cameras may also be the release of smoke bombs. Here, the author wants to declare, in fact decide the imaging effect is not merely the lens and CMOS sensor of the mobile phone, the ISP and software algorithm that has been neglected for people have a great influence on the final imaging result of the mobile phone . If the human visual system is used to compare the camera's camera system, the lens is similar to the human eye's lens and vitreous body. The CMOS sensor is similar to the human retina. The ciliary muscle acts similar to the focusing system, and the ISP is equivalent to the human visual system. Nerve center. Therefore, the role of the ISP in taking pictures of a mobile phone is crucial.
Software algorithms, like ISPs, also play an important role in the final imaging. In fact, software algorithms are relatively scarce resources. The world's only good companies in this area are Corephotonics, Arcsoft, Altek, Linx, and others. Because of the importance of software algorithms, Apple acquired LinX, an Israeli company.
In addition, in order for the dual camera to better compose photos, the architecture of the ISP must be opened to the algorithm company, and the algorithm company should do the algorithm implantation and prefabrication debugging. In this depth cooperation of the industry chain, the influence and volume are huge. Apple apparently has stronger bargaining power and coordination than domestic companies. In contrast, the domestic mobile phone companies pay more attention to the promotion of mobile phone hardware configuration, but they do not mention the software algorithm. In fact, in the era of hardware convergence, what really matters is the algorithm. Only the algorithm is good enough to make full use of the dual cameras. The hardware advantage.
Therefore, with Apple's capital, technology and supply chain control capabilities, the author guessed that even with the Huawei P9, 360 Qi cool flagship version of the black and white camera + color camera mode, the product's photographic effect will not lose at home one Public dual camera phone. After all, in software algorithms, Apple acquired Linx has more advantages.
Lei Feng Network (search "Lei Feng Net" public concern) Note: Reprinted please contact us to authorize, and retain the source and author, not to delete the content.
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