Someone is looking at your chrysanthemum! Stanford’s intelligent toilet can recognize people by anal tattoo


Welcome to the wechat subscription number of “create a story”: sinacchangshiji
Author / Liu junhuan
Source: big data digest (ID: China venture)
In October last year, lixil, the largest building materials equipment group in Japan, launched an intelligent toilet, which can automatically distinguish the shape and size of the stool through the system, enabling people to better manage their bodies, which is of particular practical value to nursing institutions.
However, at the bottom of the report message of abstract bacteria, readers with a long-term vision questioned this. If it is shared by a family, it is impossible to make accurate analysis for a single person. Therefore, a butt recognition system is needed?
Finally, half a year later, researchers at Stanford University launched an updated version of the smart toilet, which perfectly solved the problem of identity recognition.
Similar to lixil’s smart toilet, Stanford’s smart toilet also has sensors and cameras inside, but their cameras can not only recognize feces, but also recognize “Analprint”???
Anal tattoo? Is that really the anal print??
According to Seung Min Park, a senior research scientist at Stanford University and the first work of the paper, “each person’s anus has 35 to 37 folds, which are as unique as fingerprints”, that is to say, there are no two identical “anal wrinkles” in the world.
It does solve the problem of identity recognition, but I always think emmmm is strange.
The paper was published in nature on the 6th of this month. Seung Min Park said that this is only a minor part of our system. I’m really looking forward to the whole system!
Black technology has been around every year, especially this year!
Next, please cover your nose and close your eyes. Let’s have a look at this with abstract fungus Cough… Anal pattern recognition
Friendly tip: there is a bomb in the article. It’s better to avoid lunch time reading!
Paper link:
Your chrysanthemum information is not guaranteed?!
To do a good job in anal pattern recognition, from hardware to software, and then to user cooperation, one step can not be less. (serious face)
First of all, don’t talk so hard. Let’s have a look at something slightly normal.
In order to fully identify and monitor your anal wrinkles, the smart toilet is equipped with four cameras and a series of sensors, which is no more intensive:
(i) Pressure sensor, (II) motion sensor, (III) urinalysis belt, (V) anal camera, (VI) urine camera, (IV) fecal camera
With these devices, anal pattern recognition can be unlocked. For this reason, the research team also made great efforts to arrange a variety of methods, including MSE (mean squared error), SSIM (structural similarity index measure) and CNN, to ensure that the recognition effect is foolproof, and CNN is also the method used by the research team to identify feces.
Finally, just like fingerprint unlocking, users must first provide relevant information. Fingerprint unlocking needs to provide fingerprint. What anal unlocking needs to provide is Anal tattoo?
In order to let the intelligent toilet see your anal print better, you need to record a short video for it to see. After the short video is uploaded, the system will divide it into frames, and then distinguish it through the image recognition algorithm, and compare it with the user’s anal print reference image data set.
In addition to anal pattern recognition, fingerprints on the flush bar also need to be collected, the researchers said, although considering that someone doesn’t flush the toilet after going to the toilet Anal print is the most important data in the whole process. Fingerprint can only be used as supplementary data. After all, no one can replace you to go to the toilet.
Since the anal print and fingerprint are so similar, how to ensure the privacy of users? What if someone does something bad with my anal tattoo? And even if you don’t take it to do bad things, the anal lines are leaked, which is too shameful!
Researchers say there is no need to worry. Data transmission and storage are encrypted end-to-end through hash function, “data is stored on an encrypted cloud server safely”.
“We have taken strict measures to ensure that all information will not be identified when it is sent to the cloud, and this information will be protected by HIPAA (Health Insurance Portability and Accountability Act) when it is sent to medical workers.”
Not only that, the system supports low-intensity laser scanner or infrared camera for anal pattern shooting, so that what others see is only the buttocks photographed under X-ray, which greatly reduces the sense of shame.
Shit and urine fight! It’s getting more and more delicious
The identification of anal print is mainly to identify the identity. If you add the data of stool and urine, you can truly realize the personalized management and tracking of personal health!
Instead of sending people to clinics or laboratories for expensive and time-consuming blood tests, researchers say, look to the most valuable health data, which are stool, saliva and urine. “The ideal source of diagnostic information based on health monitoring is the potentially informative molecular content of breath, sweat, saliva, urine and feces.”
For example, when urinating, two high-speed cameras in the toilet will “watch” your urine flow. The back of the toilet seat is equipped with a stack of urine analysis strips. When urination starts, the passive infrared motion sensor detects the urine signal, and then automatically stretches out a strip of test paper to probe frantically. The test paper is soaked in urine, that is, the probe is successful, and then quickly retracts, and then analyzes by the embedded camera.
However, the paper points out that the current system may not be so friendly to female users. After testing a male and a female respectively, the researchers found that the system is more convenient for men who can stand to urinate. Therefore, the subsequent urine detection and urine flow measurement modules are only tested for men, but considering the physiological differences, the urination mode of women will be improved in the future.

In terms of stool recognition, from the clean toilet to the first piece of stool into the water, to the urination accompanied by the stool, and finally to the toilet paper covered stool, the whole process is monitored by the camera activated by the pressure sensor installed on the toilet.
In other words, the camera will quietly witness the process of defecation from nothing to nothing, including “the change of the shape and mobility of feces in the toilet with time”, which is unprecedented.
As mentioned above, CNN is the method used by the research team to identify defecation, but to clarify here, CNN is not focusing on your chrysanthemum, but on the toilet puddle to determine whether the toilet puddle is clean, defecate, or toilet paper.
As for the classification method of stool, the research team did not divide it randomly, but used the regular Bristol classification method. As shown in the figure below, from 1 to 7 can be regarded as a gradual process from constipation to diarrhea. 1 and 2 are constipation, 3 and 4 are normal, and 5, 6 and 7 are diarrhea. However, in addition to the following seven types, they also add three additional types: clean, urinal only and with toilet paper.
Before that, Yongtian ZHENGZHAO of lixil, who is engaged in research and development, said that the development of intelligent toilet started in 2014. The most difficult part is to collect stool images, especially those with symptoms such as constipation or diarrhea. In half a year, they collected about 3000 stool images.
Coincidentally, Stanford’s research team also said that stool collection is very difficult, and it is certainly not enough to only search on Google, Bing, Yahoo and other search engines. Therefore, they collected 12226 stool images and relevant toilet status maps from research volunteers.
These images will be sent to convolutional neural network for further processing. By calculating the time difference between the first stool and the last one, we can get the “overall defecation function of different people”. However, due to different habits, it needs to be assumed that “the behavior or standing of toilet paper means that the user stops defecating”.
Sam Gambhir, head of the Department of Radiology at Stanford University and senior author of the research paper, believes that smart toilets are not intended to replace doctors or provide official diagnosis. Instead, they are designed to monitor body waste, identify any abnormalities, and send any suspicious information to doctors to help detect any serious health problems before they occur.
The novel coronavirus said that Park hopes to have second second prototype functional by the end of this year. Ideally, they hope that the next prototype will help detect DNA and RNA, and help them track the spread of new coronavirus and other diseases.