This is an excerpt from OPPO Find X5 Pro evaluation. The core is the effect and prospect analysis of "dual OIS and Mariana X".
OPPO said that during the development of Find X5 series, there were nearly 2000 people related to imaging. OPPO claimed that the One Plus imaging team was also helping after the One Plus 10 Pro was launched. The key point is the debugging of Mariana X and dual OIS. These two efforts are not easy to present on paper. OPPO has indeed chosen a more difficult path.
About NPU (Mariana X)
NPU is a black box, and we can only see partial information from the samples and interviews.
Mariana MariSilicon X is a special image NPU, TSMC 6nm process, 11.6TOPS/W, 18TOPS computing power (peak value 1.55W?), with its own ISP and memory subsystem, which is used to realize 20bit HDR, 4K 30fps AI night scene video and other functions.
Reasonably, TSMC 6nm is more advanced than Samsung 5nm, and its energy efficiency may even be higher than Samsung 4nm. Inadvertently, the manufacturing process of NPU may be more advanced than that of SoC, Surprise!
Mariana X is prior to Qualcomm's ISP and is exposed to the original RAW data output by CMOS. In this step, NPU's own computing power is used to do AI noise reduction and HDR. Also ahead of Qualcomm ISP is OPPO's own 3A algorithm (focusing, exposure, white balance). Both the chip and the algorithm are their own, so algorithm accumulation can be done here, and it is convenient to migrate to other platforms in the future.
A few years later, The second generation of Mariana X comes out, and the first generation of Mariana X may be placed in the mid tier model As it happens, the latter's SoC is often weak in ISP and AI performance, which will enable these models to achieve superior camera performance.
OPPO said that the energy efficiency ratio of Mariana X running photography algorithm will be 50% higher than Qualcomm. The most direct effect is that OPPO Find X5 can run more large and complex algorithms. In addition, NPU is used to enhance the video preview stream, so that third-party video capture tools such as WeChat, dithering, and fast hand can have better image quality. Yes, these third-party apps are actually using preview images to output videos. Thanks to Zhang Xiaoshe's negative optimization on the Android platform, the video effect of Android is still far from that of iPhone.
OPPO said that Mariana X only played 30% of its capacity, and will continue to optimize OTA in the future 。 It is true that there is still much room for improvement in Find X5. For example, the beauty and virtualization mode in the video is still only 1080P (which can be optimized by OTA), while the video AI mode is only 4K 30FPS (which should not be optimized upwards). The main bottleneck here is the performance and power consumption of CMOS. The HDR or night scene of 4K 60FPS requires dual frame synthesis, which means that CMOS has the ability to output 4K 120FPS, Both power consumption and CMOS are hard to resist.
About Dual OIS
OPPO Find X5 Anti shake Diagram ↑
OPPO's dual OIS claims that the module has 2.2 times the volume, 4 times the amount of light input, and 3 times the anti shake performance, which can achieve "plus or minus 3 degrees of anti shake and plus or minus 0.7 degrees of rotation" anti shake, and the safety shutter is extended from 1/8 seconds to 1/2 seconds (as a reference, vivo's micro PTZ is also plus or minus 3 degrees, 3 times the anti shake performance, and the 1/2 second shutter film rate is 64%). In terms of the anti shake capability of the official announcement, OPPO's "dual OIS" is based on vivo's micro platform.
Structurally, it is the traditional camera anti shake+the SMA anti shake on the sensor. The latter is a shape memory alloy suspension wire pull sensor (similar SMA motors are used in many machines such as iPhone, Huawei P30 Pro/Mate30 Pro, Meizu 18 Pro, etc.
Five axis anti shake diagram of Sony DV ↑
In fact, the five axis anti shake on the camera is decomposed into three categories: translation, swing and rotation, corresponding to the so-called "XY axis, RollL, Pitch and Yaw"
Horizontal and vertical displacement (XY axis translation): If the two axes shake at the same time, it really needs the assistance of the sensor displacement anti shake, which can be prevented by OPPO dual OIS, but the micro PTZ can not be determined;
rotate (Roll), that is, shaking around the center of the sensor: the sensor displacement anti shaking can make the CMOS rotate, which is also the OPPO dual OIS anti shaking (although only positive or negative 0.7 degrees), but the micro PTZ can not be fixed;
Pitch swing and left and right swing (Pitch and Yaw), that is, rotate up and down and left and right around the center of the sensor. They will produce the effect that the center is not pasted, but the edge is pasted. Handling these two jitters is the strength of the micro PTZ.
On the left is the disassembly of @ Shengli Wencrepe, and on the right is the disassembly of @ Lou Bin
The volume growth announced by OPPO has no false sign ↑
Dual OIS, let The area of this module is the same as that of Xiaomi 11 Ultra GN2 (Of course, much thinner). OPPO even has a thickness margin. It has equipped the IMX766 with a lens with a longer focal length, making the physical focal length of the IMX766 close to that of the IMX689 (5.97mm vs. 6.06mm). by the way, OPPO also said that it did not intend to brush CMOS dimensions so soon before fully digging 1/1.56 inch sensors.
How about the effect?
Weak light imaging contrast ↑
Weak light imaging contrast, central amplification ↑
Weak light imaging contrast 2 ↑
Weak light imaging contrast 2, central amplification ↑
From the comparison of the above samples, the effect of dual OIS is hidden in the difference between Mariana X and the algorithm. and OPPO did not give too many opportunities to the dual OIS to take photos:
OPPO Find X5 is similar to the Xiaomi 12 series, which controls the shutter speed for film rate and capture speed , the shutter speed of most scenes is faster than Xiaomi, vivo, Yijia The slow shutter time of the dual OIS has not been used up. At this stage, it may be more to improve the success rate of multi frame synthesis (improve the film rate).
Even in extremely low light night scenes, the imaging speed of OPPO Find X5 is unbelievably fast. When flagship brands such as Xiaomi 11 Ultra and vivo X70 Pro+need 2-3 seconds of super night scenes, OPPO Find X5 usually finishes in less than 1 second (the imaging speed of iPhone's super night scenes is not so advanced).
Now, on the contrary, OPPO has chosen the latter scheme between "super bottom" and "big bottom+mechanical anti shake" (OPPO/Find is really a mechanical structure enthusiast). Reasonably, adding dual OSI or micro PTZ to 1/1.56 inch CMOS can really be considered a flagship product, but it is certainly not as exaggerated as "equivalent to 1 inch" at the communication meeting.
Compared with "large pixel short shutter" and "small pixel long shutter", no matter how strong anti shake is, you are using long shutter to change the effect, and long shutter is bound to lose the capture ability. Although the double OIS leaves infinite possibilities for computational photography, it still cannot win the simple and rough bottom at this stage.
In fact, the cost of OPPO Mariana X+dual OIS (plus R&D costs) is not lower than GN2. OPPO and Xiaomi diverged on the form of "sparing no cost".
About telephoto
When castrating a telephoto lens, manufacturers always mention "low utilization rate". However, the usage rate of the lens is not directly related to its importance. You may only use the ultra long focus lens several times a week, but the notes in class and the distant scenery may be of great significance. Users who value taking photos are often more willing and able to explore the telephoto lens.
The bad news is that OPPO generation has no telephoto; The good news is that OPPO has made it clear that the next generation will have high-quality telephoto.
OPPO said that Mariana X's ability has only played 30%, and will continue to optimize OTA in the future. The verification method is also very simple. After several months, we can compare the new and old firmware versions of Find X5. It will be decided whether to paint a cake or work.
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