What is the working principle of license plate recognition system?

The principle is to identify the number of the license plate by taking pictures of the vehicle traveling on the road by the camera. The process involves: vehicle detection - image acquisition - preprocessing - license plate location - character segmentation - character recognition - result output.

Vehicle detection: It can detect the passage of the vehicle through various methods such as buried coil detection, infrared detection, radar detection technology, and video detection, and triggers image capture and capture.

Image acquisition: Real-time, continuous recording and acquisition of passing vehicles through high-definition video capture.

Preprocessing: noise filtering, auto white balance, auto exposure and gamma correction, edge enhancement, contrast adjustment, etc.

License Plate Positioning: Rows are scanned on the grayscale image after image preprocessing to determine the license plate area.

Character segmentation: After the license plate area is located in the image, the character area is accurately positioned through processing such as graying and binarization, and then character segmentation is performed according to the character size feature.

Character recognition: The segmented characters are scaled, extracted, and matched with the standard character representation in the character database template.

Result output: The license plate recognition result is output in text format.

Ultra Audio Heating Equipment

Superaudio induction heating equipment is mostly used for surface quenching of industrial metal parts. It is a kind of metal heat treatment method that makes the workpiece surface generate a certain induced current, quickly heat the surface of parts, and then quickly quench. Super audio induction heating equipment, that is, induction heating of the workpiece, in order to quench the surface of the equipment.
The principle of super audio induction heating equipment: it is the use of high frequency current flow direction is wound into a ring state or the shape of the heating induction coil, high frequency induction is usually made of red copper hollow pipe. A powerful magnetic beam that generates a transient change of polarity in a high-cycle induction coil places the metal in need of heat treatment in a high-frequency coil, and the magnetic beam penetrates the entire heated metal object. In the interior of the induction heating object and the induction heating current in the opposite direction, the corresponding strong eddy current. Because there is resistance in the induction heating metal, so strong joule thermal energy is generated, so that the temperature of the induction heating object rises rapidly, so as to achieve the purpose of heat treatment. Therefore, super audio induction heating equipment in the industry, can also be called: high frequency induction heating equipment; High and medium frequency induction quenching equipment; Induction diathermy equipment; High frequency quenching machine, high frequency induction heating machine, high frequency welding machine.
Performance and characteristics of super audio induction heating equipment:
Fast heating: the fastest heating speed is less than 1 second, (the speed can be adjusted and controlled)
Wide heating: can heat all kinds of metal workpiece (according to the different shape of the workpiece to replace the detachable induction ring)
Easy to install: connect the power supply, the induction ring and the water pipe can be used; Small size, light weight, very easy to use
Easy to operate: It can be learned in minutes
Quick start: heating can be started after the water is connected to the electricity
Less power consumption: about 70% power saving than the old vacuum tube high IF equipment, the smaller the workpiece, the smaller the power consumption
Good effect: heating is very uniform (can also adjust the density of induction ring, so that each part of the workpiece to obtain their own required temperature), fast heating, less oxide layer, no waste after annealing
Power adjustable: stepless adjustment of output power
Full protection: with over voltage, over current, over heat, water shortage and other alarm instructions, and automatic control and protection

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Ningbo Yufeng Electronics Co., Ltd , https://www.yufengheating.com