Customized mobile phone camera ISP solution, only for that 15% shine

With the high-profile Meizu MX3 announced that its mobile phone camera is equipped with a separate Fujitsu four-channel image signal processor (ISP), Fujitsu Semiconductor and its Milbeaut image signal processor products gradually move from behind the scenes to the front, 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 leading domestic and international smartphone brand manufacturers have publicly claimed that their mobile phone cameras use Fujitsu Semiconductor's series of image signal processors.

Recently, at the "2014 Industry and Technology Outlook Media Seminar" held in Shenzhen, Fujitsu Semiconductor Corporation presented the first technical speech on how to improve the image quality of camera signals for some Chinese media editors and reporters. Shen Hongren, senior manager of the marketing department of Fujitsu Semiconductor Corporation, gave an in-depth sharing and exchange to the media in the conference for nearly an hour.

Mobile phone camera "behind the scenes"

"In fact, Fujitsu Semiconductor's Milbeaut image signal processor has been used in digital cameras for more than a decade. In professional SLR cameras, more than 80% of ISPs are based on Milbeaut. The world's major digital camera manufacturers are almost all Fujitsu. Semiconductor customers." Shen Hongren said. According to him, Fujitsu Semiconductor is the only company in the world that can provide both SLR cameras, card-type digital cameras and mobile phone camera image signal processor solutions.

"Fujitsu rarely advertised its camera ISP products and technologies in the past, mainly because the concentration of global digital camera manufacturers is very high." Shen Hongren pointed out. In recent years, with the increasing power of digital cameras for smartphones, especially when the resolution exceeds 5M pixels, the trend of mobile phone cameras replacing card cameras is increasing, and independent ISP solutions are favored by more and more mobile phone manufacturers. "Fujitsu Semiconductor's Milbeaut series of digital camera solutions inherit the rich image processing technology and experience of 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.

Customized mobile phone camera ISP solution, only for that 15% shine

For the first time, Shen Hongren delivered a speech on mobile phone camera ISP solution for 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, and on digital SLR cameras and card-type digital cameras. More than ten years of experience in solution development and service providers is undoubtedly a weapon in the mobile phone camera ISP market. It is reported that Fujitsu's third-generation Milbeaut Mobile ISP is the first to adopt a variety of functions successfully applied in digital cameras, such as continuous autofocus and face recognition for still image photography; the sixth generation of Milbeaut Mobile ISP uses a traditional digital camera. All features, but also with high-definition video (1920x1080 pixels) continuous autofocus, and more.

Work hard for 10% to 15% image improvement

The world is entering the era of mobile internet, smartphones are carrying almost all mobile internet dreams, and digital camera features add unlimited color to this dream machine. Mobile phone camera functions from 5 megapixels and 8 megapixels to 13 million pixels, 16 million pixels or even 20 million pixels for some high-end mobile phones today. "Not only is the rapid increase in pixels, mobile digital cameras are facing rapid technological advances." Shen Hongren pointed out. As far as the optical system module is concerned, he summarizes several major statuses and trends in recent years:

The lens sensor measures from 1/3'' to 1⁄2.5" and 1/1.8", and the ever-increasing lens size allows for a larger aperture;

The lens group has increased from the previous 4 groups by 5 groups, but the consequence of this is that the camera components are aggravated, affecting autofocus;

The pixel size is getting smaller and smaller, from 1.4um to 1.12um, and 0.8um;

The autofocus module is developed for VCM closed loop, MEMS or phase detection passive autofocus systems;

Zero Latency Shooting (ZSL) requires that the sensor must output full resolution images at a higher frame rate, requiring a higher MIPI (Mobile Industry Processor Interface);

Customized mobile phone camera ISP solution, only for that 15% shine

Fujitsu Semiconductor ISP Solutions Targets Mid- and High-End Mobile Camera Applications

"These developments have brought more and more challenges to the design of image signal processor solutions and the final adjustment of mobile phone camera functions." Shen Hongren pointed out, "It is obvious that the reduction in pixel size will inevitably reduce the unit pixel capture. The number of photons, which will affect the quality of the acquired image data, will inevitably bring challenges to subsequent image processing." According to him, the image quality improvement space that mobile phone image signal processor can bring is about 10% to 15%. However, these trends in image sensor optical modules have brought new challenges to the original image processing techniques and methods, and it is necessary to improve the original image processing algorithms and even find new image processing solutions.

Shen Hongren shared with you some of the leading features of Fujitsu Semiconductor's current ISP solution for high-end mobile phone cameras - the M-10MO product line: 13Mpix@30fps zero-latency shooting; low power consumption - at 13Mpix@30fps About 280mW in zero-latency camera mode; Full HD video capture of 120 frames per second; Full HD video capture of 30 frames per second while achieving 13-megapixel camera shooting at 3 frames per second According to Shen Hongren, the program 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 mobile camera shooting results? Shen Hongren gave several sets of contrast photos in his speech. The following picture is a comparison of photos taken by the same scene mobile phone camera. 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 phone to enhance the contrast, Sugar mobile phone Some are cooler, while the Apple iPhone pursues natural effects.

Customized mobile phone camera ISP solution, only for that 15% shine

Different mobile phone manufacturers have different preferences for image quality, and customized design results to achieve product performance differentiation.

"The image requirements for 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. Therefore, image signal processor solutions are not standardized. Products, but need to be customized according to the differentiated needs of manufacturers and complex adjustment work." Shen Hongren said. In fact, the user's requirements for camera functions are inherently complex, so the customized design is suitable for manufacturers to meet the needs of different market positioning.

Seriously researching the smartphones that are on sale in the market can all see their respective product differentiation characteristics when promoting their mobile phone camera selling points. For example, you can see that the Meizu MX3 emphasizes 20 fast shooting capabilities per second and zero-latency camera technology. The Mito U2S emphasizes the quality of the camera under the low light. This is not a slogan. Behind the actual technical dry goods, their R&D staff and our technical team have carried out very intensive and meticulous cooperation on image quality adjustment. There are Knowhow of both of us.” Shen Hongren smiled. Point out.

Shen Hongren emphasized that Fujitsu's semiconductor camera image processor solutions are highly customizable - hardware and firmware can be configured according to customer needs, and the solution can be fully tuned 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 powerful The design support team, and this is our unique advantage."

Shen Hongren is not optimistic about the challenges of Fujitsu Semiconductor's traditional independent ISP providers for the integration of ISP functions by application media. “Mobile phone manufacturers need differentiated solutions that can achieve unique selling points, instead of a me too design, which is difficult for traditional AP manufacturers. The camera is a very personalized product. Is by no means a standardized product," he stressed.

In fact, on the other hand, the image processing requirements of mobile phone cameras have reached a very high level, and the application processor to process a large amount of image data has a great challenge to the power consumption level of the processor. Independent, professional hardware image processors can achieve lower power consumption levels with higher processing power, which also caters to the low power requirements of users requiring longer standby times. “In the future, we may also use 40nm, 20nm and more advanced process technologies to achieve lower power consumption. At present, our M10MO image signal processor consumes about 280mW at 1080P@30FPS, which is already a low level in the industry. Shen Hongren said.

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