Official first revelation: Does a bracelet tied to a dog count as WeChat steps?
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Since WeChat launched the walking rankings, many friends have come up with various ways to dominate the rankings, including tying sports bracelets to dogs. So does a bracelet tied to a dog count as WeChat steps? Today, WeChat officially revealed the secret for the first time. To understand these questions, you need to first use 1 minute to explain a simple truth: What is the basis of "steps"? The secret behind the number of steps: acceleration Even if it seems to be a leisurely stroll at a uniform speed, for the devices we carry (such as mobile phones and sports bracelets), each step has experienced a roller coaster-like "acceleration" change. Generally speaking, when you lift your legs and take a step, the acceleration is the largest. We put it on a coordinate axis, and the change in acceleration looks like a cosine waveform. (The x-axis represents time, and the y-axis represents acceleration) Between two peaks, it can be considered a step. If 8 peaks appear in succession (different hardware manufacturers have different standards), it can be basically determined that the person is in motion. The device begins to count these previous fluctuations and the following fluctuations as steps. This is the most basic principle of step counting . In actual scenarios, the algorithm also needs to remove a series of "noise". For example, when we walk, the phone in our pocket will shake up and down, generating acceleration in different directions. At this time, the algorithm must judge and remove the "noise", leaving only the most important movement features. These tasks are completed by a collector (accelerometer) and a processor (Sensor Hub, coprocessor). The collector collects acceleration information and provides it to the processor for analysis. Currently, iPhone 5s and above Apple phones and some Android phones have integrated this collection and analysis framework. And external devices such as sports bracelets also collect and analyze data based on a similar framework and transmit it to the mobile phone via Bluetooth. (Yes, the above are all solved by hardware manufacturers, and WeChat has not yet been mentioned, so don't worry.) So, now you have a certain understanding of the basic principles of step counting. It feels so simple, right? Let's take a look at the following simple examples. Q: Does stepping in place count? A: Yes, it counts, just like walking. Because you are stepping in place, although there is no displacement relative to the ground, the acceleration exists. Similarly, when running on a treadmill, don't worry, the number of steps is recorded. Q: What about shaking your legs while sitting? A: This is related to the amplitude and frequency of your shaking legs. Let's see whether you are amazing or the mobile phone manufacturer has a sophisticated algorithm. Any vibration will be collected, but different hardware manufacturers' algorithms may handle these scenarios differently. Q: Is it okay to tie it to a dog? A: Since you asked this, I'm afraid I can only say that it has something to do with the dog's personality. If a quiet dog or a puppy walks slowly, the acceleration generated by his/her steps may not be as high as that of a human, and it will not reach the threshold of the algorithm. For dogs with lively personalities or larger dogs, the movement acceleration characteristics are similar to those of humans, and the possibility of "cheating" the algorithm is higher. Different mobile phone manufacturers also have different algorithm optimization solutions. Q: I live a straight line from three points to one line, and I only take a few thousand steps a day. If I have the opportunity to take a train, can I increase my step count? A: Knowledge points, knowledge points cannot be thrown away, students. The basic principle of pedometer is not to collect distance or speed, but to collect acceleration. No matter how far or how fast the train goes, in most cases it moves at a constant speed (or constant acceleration and deceleration), the acceleration changes are not significant, and it is impossible to form a waveform similar to walking. On the train, if you don't walk, the possibility of counting steps is very small. Follow-up question: What about shaking the phone on the train? Answer: Shaking is also possible, because there is a longitudinal acceleration, which will produce ripples in the longitudinal direction. But this has nothing to do with trains, and there is no essential difference from shaking your legs in place. Question: Why do my steps count when I take the bus? Answer: Yes, the probability of being counted on the bus is relatively high. Road conditions have a certain impact. When driving on busy roads, stopping and starting will produce changes in acceleration. It is also related to the driver's driving habits. If the driver keeps braking or bumps hard, the acceleration will have a great impact. If you encounter a local old driver who drives steadily and is familiar with the road conditions, it is less likely for passengers on the bus to count their steps. Question: What is the step calculation cycle of WeChat Sports? Are steps still counted after the ranking list at 10 pm? Answer: From midnight to 24 o'clock at night. However, the WeChat Sports rankings are pushed at 10 pm, and users generally check the rankings and give likes to each other at that time. If you go for a run at 11 pm, it will be recorded, but no one else will see it, which will reduce the fun of comparison. The number of steps will be reset to zero after 0:00. Q: Each manufacturer has its own algorithm. How can it be fair for users of different devices to be ranked together on WeChat Sports? A: In fact, in addition to shaking legs and taking the bus, walking and running are the most important scenarios for daily exercise. The algorithms for these basic scenarios are relatively unified in the industry. WeChat also has a set of testing processes for major scenarios to ensure that the number of steps counted by different devices is not much different. For extreme scenarios, the algorithm will continue to be optimized. Finally, there is the cheating issue that you have always wanted to ask. In fact, there are many places where cheating can be done. Especially for Android, as an open source system, it is possible to manually change the reported data. WeChat has a set of anti-cheating mechanisms, such as a simple legality check of the speed on the user's mobile phone. If you walk 10 steps in one second, this data may be directly erased by the system. And it also pauses the step count for him, making him feel that cheating is useless. As you can imagine, it is impossible to completely eliminate small "cheating" such as shaking legs and tying dogs. For serious and obvious continuous cheating, WeChat will blacklist the cheater, and his data will no longer be visible to others, so he can only be happy by himself. As a winner of Toutiao's Qingyun Plan and Baijiahao's Bai+ Plan, the 2019 Baidu Digital Author of the Year, the Baijiahao's Most Popular Author in the Technology Field, the 2019 Sogou Technology and Culture Author, and the 2021 Baijiahao Quarterly Influential Creator, he has won many awards, including the 2013 Sohu Best Industry Media Person, the 2015 China New Media Entrepreneurship Competition Beijing Third Place, the 2015 Guangmang Experience Award, the 2015 China New Media Entrepreneurship Competition Finals Third Place, and the 2018 Baidu Dynamic Annual Powerful Celebrity. |
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