With Meizu MX3's high-profile announcement that its mobile phone camera is equipped with an independent Fujitsu four-channel image signal processor (ISP), Fujitsu Semiconductor and its Milbeaut image signal processor products have gradually moved from behind the scenes to the front desk for more engineers and mobile phone users. Familiar. In fact, in the public information, Meizu MX3, OPPO u like, Samsung GALAXY Note II, GALAXY Zoom and other domestic and international leading smartphone brand manufacturers have publicly declared that their mobile phone cameras use Fujitsu Semiconductor's series of image signal processors.
Recently, at the "2014 Industry and Technology Outlook Media Symposium" held in Shenzhen, Fujitsu Semiconductor delivered the first technical lecture on "How Image Signal Processors Improve Camera Image Quality" for some Chinese media editors and reporters. Shen Hongren, senior manager of the marketing department of Fujitsu Semiconductor Company, had an in-depth sharing and exchange with the industry media participants for nearly an hour.
The mobile phone camera "Hero Behind the Scenes" that surfaced
"In fact, Fujitsu Semiconductor ’s Milbeaut image signal processor has been used in digital cameras for more than ten years. Among professional SLR cameras, more than 80% of ISPs are based on Milbeaut, and almost all major digital camera manufacturers in the world are Fujitsu. Semiconductor customers. "Shen Hongren said. According to him, Fujitsu Semiconductor is currently the only company in the world that can simultaneously provide image signal processor solutions for SLR cameras, card-type digital cameras and mobile phone cameras.
"Fujitsu has rarely publicized its camera ISP products and technologies in the past, mainly because the global digital camera manufacturers are highly concentrated." Shen Hongren pointed out. In recent years, with the increasingly powerful digital camera functions of smart phones, especially when the resolution exceeds 5M pixels, the trend of mobile phone cameras replacing card cameras is increasing, and independent ISP solutions have been favored by more and more mobile phone manufacturers. "Fujitsu Semiconductor's Milbeaut series digital camera solutions inherit the rich image processing technology and experience on SLR cameras and card-type digital cameras, which can make up for the lack of digital camera development capabilities of these many mobile phone manufacturers." Shen Hongren said.
Shen Hongren gave the first keynote speech on mobile phone camera ISP solution to domestic media
According to Shen Hongren, the main markets facing the Fujitsu Milbeaut image processor product line include three-digital single-lens reflex cameras (DSL-R), card-type digital cameras and mobile phone cameras, while on SLR digital cameras and card-type digital cameras More than ten years of experience in solution development and service providers are undoubtedly a weapon to compete in the mobile phone camera ISP market. It is reported that Fujitsu ’s third-generation Milbeaut Mobile ISP took the lead in adopting a variety of functions that have been successfully applied in digital cameras, such as continuous auto-focusing of still images and face recognition; the sixth-generation Milbeaut Mobile ISP uses traditional digital cameras All functions, but also has high-definition video (1920x1080 pixels) continuous autofocus, and so on.
Work hard for 10% ~ 15% image improvement
The world is entering the era of mobile internet, and smartphones are carrying almost all mobile internet dreams, and the digital camera function adds unlimited colors to this dream machine. Mobile phone camera functions range from 5 megapixels and 8 megapixels, to 13 million pixels, 16 million pixels or even more than 20 million pixels in some high-end mobile phones today. "Not only is the rapid increase in pixels, mobile phone digital cameras are facing rapid technological progress." Shen Hongren pointed out. As far as the optical system module is concerned, he summarizes several current status and trends in recent years:
The lens sensor size is from 1/3 "to ½.5" and 1 / 1.8 ", the ever-increasing lens size can get a larger aperture;
The lens group is increased from the previous 4 groups to 5 groups, but the consequence of this is that the camera components are heavier and affect autofocus;
The pixel size is getting smaller and smaller, from 1.4um to 1.12um, and 0.8um;
The auto focus module is developed to VCM closed loop, MEMS or phase detection passive auto focus system;
Zero time-lapse photography (ZSL) requires that the sensor must output a full-resolution image at a higher frame rate, which requires a higher MIPI (Mobile Industry Processor Interface);
Fujitsu Semiconductor ’s ISP solution targets mid- to high-end mobile phone camera application needs
"These development trends have brought higher and higher challenges to the design of image signal processor solutions and the final adjustment of mobile phone camera functions." Shen Hongren pointed out, "Obviously, the reduction in pixel size will inevitably reduce the unit pixel capture The number of photons, which will affect the quality of the obtained image data, will inevitably bring challenges to subsequent image processing. "According to him, usually the image quality improvement of mobile phone image signal processor can bring about 10% ~ 15% room for image quality improvement However, these development trends of image sensor optical modules have brought new problems to the original image processing technologies and methods. It is necessary to improve the original image processing algorithms and even find new image processing solutions.
Shen Hongren shared with you one of Fujitsu Semiconductor ’s current ISP solutions for high-end mobile phone cameras-some of the leading features of the M-10MO product line: it can achieve 13Mpix @ 30fps zero-latency shooting; low power consumption-at 13Mpix @ 30fps Approx. 280mW in zero-delay photography mode; Full HD video shooting at 120 frames per second; Full HD video shooting at 30 frames per second, and 13 million pixel photo shooting at 3 frames per second ...... According to Shen Hongren, the solution has been successfully applied in some first-line high-end mobile phones.
Mobile phone camera ISP, customized design is king
How to achieve the best shooting effect of mobile phone camera? Shen Hongren gave several sets of comparative photos in his speech. The following picture is a comparison of photos taken by a mobile phone camera in the same scene. The bottom left is the standard image from Fujitsu Semiconductor's ISP, but after processing by different mobile phone manufacturers, it produces different effects-such as VIVO mobile phones to improve contrast, Sugar mobile phones It's a bit cooler, and the Apple iPhone pursues a natural effect.
Different mobile phone manufacturers have different tendencies to image quality, and customized design results achieve product performance differentiation
"The image effect requirements of cameras are often different from person to person. Different mobile phone manufacturers have different emphasis or even inclination on the requirements of image signal processing solutions, so the image signal processor solution is not standardized Products, but need to be customized design and complex adjustment work according to the differentiated needs of manufacturers. "Shen Hongren said. In fact, the user's requirements for camera functions are very complicated, so customized design is suitable for manufacturers to meet the needs of different market positioning.
When carefully studying the smartphones on the market when promoting their mobile phone camera selling points, they can all see their respective emphasis on the differentiated characteristics of their products. For example, you can see that the Meizu MX3 emphasizes its 20-second fast-photographing capability and zero-latency photographing technology, the Meitu phone ’s front camera ’s super noise reduction function, and the OPPO U2S emphasizes its picture quality under low light ... This is not an advertising slogan, and behind it is real technical dry goods. Their R & D personnel and our technical team have conducted very in-depth and meticulous cooperation on image quality adjustment. There is Knowhow on both sides. " Pointed out.
Shen Hongren emphasized that the Fujitsu Semiconductor camera image processor solution is highly customizable-the hardware and firmware can be configured according to customer needs, and the solution can be fully adjusted according to the customer's sensor module. "This customized design requirement is also the reason why Fujitsu Semiconductor's image signal processing solutions are favored by many mobile phone manufacturers." Shen Hongren said, "Customized design requires strong design service capabilities, requires very professional Knowhow support and strong Design support team, and this is our unique advantage. "
Aiming at the challenge to the traditional independent ISP provider of Fujitsu Semiconductor by the application processor integrated ISP function proposed by the media participants, Shen Hongren was not optimistic for the same reason. "Mobile phone manufacturers need a differentiated solution that can achieve a unique selling point and achieve customization, rather than a me too design, which is difficult for traditional AP manufacturers. The camera is a very personalized product , By no means a standardized product. "He emphasized.
In fact, on the other hand, the current image processing requirements of mobile phone cameras have reached a very high level. The use of application processors to process huge amounts of image data poses a great challenge to the processor's power consumption level. The independent and professional hardware image processor can lower the power consumption level under higher processing capacity, which also caters to the user's demand for low power consumption of mobile phones with longer standby time. "In the future, we may also use 40nm, 20nm and more advanced process technologies to achieve lower power consumption. At present, the average power consumption of our M10MO image signal processor at 1080P @ 30FPS is about 280mW, which is already a very low level in the industry. "Shen Hongren said.
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