Under the coincidence, the author has been fortunate to get a new "Xian" Spark drone in Datang, and it is used to consisten to the market, which has a constant drone manifest, "Xia" Spark's palm takes off, gesture handling appears to be unique, nature Key attention, the author also put it in the first place.
How long does a drone have to take off from boot? The answer given by Datang is 25s. This is a very great time, so many people don't believe it!
This article Original Address: https://www.eeboard.com/evaluation/sparkgeSture/
Seeing the online media evaluation online, the probably 50s is about 50s, obviously, they don't understand how the time given by Dado means how to take off. After the actual experience of the author, it is unquestionable, which means that it is achieved in the case of the handheld, but also must master the SPARK operation in your default, and have been configured with the premise of the SPARK in the handheld.
After several tests, palm off really make SPARK dawn take-off is scheduled for between 25s ~ 30s, 25s can be said to be a minimum limit.
So, what is the process of hand control?
Simply refer to the figure below:
3D sensing system
One of the important steps on the palm is to detect, only after the identification is successful, then the spark is what to identify people's face?
Many people returned to the 3D sensing system above the front camera on the front of the Spark. In fact, it is more precisely that the cooperation of the 3D sensing system with the main camera is achieved.
I should know that the 3D sensor system is in fact consisting of two infrared transmitters and a camera, while this camera is mainly used to collect infrared light emitted from the infrared transmitter to an obstacle. Returned light.
Here we introduce a concept, TOF (TIME OF Flight), the flight time method, shown in the next conceptual diagram, the speed of light is known, as long as the infrared light can calculate the distance from the time of transmitting to the returned .
Therefore, in the dawn SPARK on face detection, the sensor can be calculated from the 3D face (Xiao SPARK set only within a distance of the detected face to unlock UAV), the main camera for face The detection of the mode is unlocked by a close-range face mode. In addition to the avoidance function of the distance, the 3D sensing system is used to achieve a depth of field in the actual flight.
Visual positioning system
In the gesture control mode, after a successful take-off at dawn SPARK is hovering at the take-off position, if outdoors, well understood, can be achieved given the high positioning by GPS and other functions, and ultrasonic ranging, but Xiao SPARK indoors Can realize a high positioning, how is it implemented?
There is a portion known as a visual positioning system at the bottom of the SPARK, as shown in the figure below, consists of a set of infrared transceivers and a light-flow sensor.
The infrared transceiver is high, which is about 0 to 8M, which looks like this, and the role of the light-flow sensor is "positioning"? How do it position?
Here, an optical flow speed concept is introduced because the optical stream "positioning" is not directly positioned, and the position is calculated by the speed.
The image sensor in the SPARK light stream sensor continuously captures the photographed object surface image (within 30m), and then analyzes the generated image digital matrix of the DSP, which will always exist since the adjacent image will always exist. Features, by comparing the positional change information of these feature points, the average movement of the surface features of the object can be judged, and the position calculation can be performed.
When the Spark is hover, the lock can be locked by extracting the coordinates of the target image feature point, and the hover is achieved by the infrared transceiver.
So, if it is a dark night, the captured images are black, then the light position is not used anyway? (The answer will be announced after the answer)
Take a flight, hover, then gesture identification, manipulation, photo and other functions, these functions have the principle of human face testing, but in fact, whether the 3D sensing system is still the main camera, visual sensing system, actually presented on the surface The acquisition system, all of this series of features must be completed with core vision processing units MYRIAD 2 VPU (Movidius's products, now in Intel), which can achieve multiple advanced visual visuals. Algorithm, and there are a large number of neural network algorithms, so the power of SPARK is not only powerful in the surface, but the system design of the entire product.
Physical test gesture
After familiar with the gesture manipulation method of SPARK, the actual operation is quite simple.
The action recognition is very fast, but the action amplitude is not too fast when manipulating the drone exercise, and it will cause the gesture to follow, you need to re-identify it.
The gesture can manipulate the flight up and down left and right before and after the drone, or let the drone implement the order, in the case of jogging, followed by a drone shooting or a very cool thing, the life is too short. Only more than 10 minutes effective flight time.
In the case of sufficient light, no matter what is outdoors or indoors, there is no problem with the gesture control of Spark. However, what is the situation in the dark outdoor and indoor?
Foundation found that in other or indoors, because the forearm lamp of Xiao Spark will be shining, it is possible to detect the taking off.
However, in the room, it will not hover in the outdoor, which will remain in a height, why?
Obviously, in the dark room, there is no GPS, the visual positioning is also invalid. Although the face is detected, although the infrared transceiver at the bottom can work normally, it is not possible to locate it, resulting in unable to hover, Spark remains in the same height.
Gesture control freshness
I gave the gesture to handle the freshness of 3 days. The main reason is that there is too little gesture function. There is no deep excavation of playability. Maybe you will be very excited, then slowly feel boring, and finally the only one is very Practical features may be on the palm.
If it touches with Dajiang UAV phone APP, the playability greatly enhanced, in addition to the basic remote control, APP also supported in a movie function keys, such as the sky, away, surrounded by four kinds of spiral Different shooting methods, stereoscopic, body is very strong, maybe you have never had Selfie, but also support to generate a short video for 10 seconds, support editing and fast sharing video in the playback of the app, This kind of friend who is selfie is simply hanging.
The camera of Xia spark will automatically follow the shooting according to the shooting target of your box, and will make the shooting target in the front position of the shooting screen by adjusting the body or camera, will not let you have passers-by, passerby .
In addition, the app also supports the flying flying, which is where your finger is point to the picture. Where is the drone flight, it will automatically avoid obstacles on the flight route, which is a novice drone manipulation method, simple , Rude, effective.
"Life was like a box of chocolates, you never know what you're gonna to get." The author of this sentence before nothing too deep feelings, the dawn SPARK drone experience I'd let it suddenly impressed What is going on?
At this moment, the temperature is in the summer, the temperature here is about 37 ° C, after the exposure, the outdoor temperature may be higher, when the drone is flying, there is a special entry, flew it on the hot sun, the sun is not the sun. burn it, the results really unexpected, or that makes the eye broken in one place.
It's not a good spark, but I'm not going to strike in real time, the iPhone mobile phone is not strike, guessing may be the flying fly, the worse the signal, the greater the WiFi power of the map, and the heat is more Serious, plus many factors such as outdoor exposure.
Coincidentally, this time the drone is executing the flying mode, which has long been beyond the distance of gestures, and it is not possible to operate with remote control. This TM is embarrassing. The only way you can think of: Waiting SPARK drone without electricity automatically, and it is to quickly cool down to the phone.
In the end, I still caught the drone recalled by the mobile phone, but this is that this is the cooling system design, not generally good, is very good, returned drone, did not feel overheat. If you have a heart, you will find that the place that Spark is amazing is still in such a refined ID design, and also taking care of cost, productivity, reliability, heat dissipation, power, radio frequency. performance factors, such as electromagnetic interference, showing that this is a devoted wisdom and passion of the product.
Ok, the experience is finished, and finally, the author is a few feelings of Spark, then you decide the value is not worth buying.
Advantages:
Small and portable, elegant appearance (apple UAV), the easy to carry out.
Although the two-axis head, but a good head stability, image quality is also good.
The palm takeoff is indeed convenient, and occasionally hand gesture control is also a power supporter.
Point pointing, point to, where to fly?
Follow the flight, where is the people?
Disadvantages:
The chassis is low, and it is easy to laugh the lens.
There is too little gesture handheld function, and the gesture action will be identified with the hand gesture.
Endurance is not satisfied, 10 minutes of effective flight time cannot be happy.
Only 1080p video shooting is more regret.
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