TW202141442A - Embedded vehicle license plate recognition and screening system and control method thereof including a housing unit, an image capturing unit arranged in the housing, a transmitting unit, a processing unit - Google Patents

Abstract

An embedded license plate recognition and screening system, which includes a housing unit for being embedded in the ground, an image capturing unit arranged in the housing unit and used for capturing a real-time image, a transmitting unit for receiving a vehicle license plate certificate photo and transmitting it to an external device, and a processing unit for receiving the real-time image in a streaming manner. The processing unit includes a control module, and the control module is used for capturing the real-time image as a temporary certificate photo, and screening out the license plate part according to the license plate contour in the temporary certificate photo, and then saving the license plate part as the license plate certificate photo and transmitting it to the transmitting unit. The effect of the present invention is that when being embedded in the ground and upwardly capturing the real-time image to reduce the volume, only the part of the license plate photo is screened out, so as to achieve the purpose of protecting the privacy of others.

Description

Embedded vehicle license plate identification and screening system and its control method

The invention relates to a vehicle license plate recognition system, in particular to an embedded vehicle license plate recognition and screening system and its control method.

In recent years, technology has developed rapidly. The use of sensors to detect vehicles and take photos and records has gradually replaced the previous manual method of taking photos and recording parking time.

Referring to Figure 1, the case of Patent Publication No. TW I626624B discloses that an existing license plate recognition system includes a first timing column 11 and a second timing column 12, and the first timing column 11 is arranged in a first parking compartment 110 The second timing column 12 is arranged on the long side of a second parking compartment 120, and the second parking compartment 120 is located in front of the first parking compartment 110.

The first timing column 11 includes a first front compartment sensor 111 for detecting the second parking compartment 120 and a first camera unit 112 for photographing the first parking compartment 10. Similarly, the second timing column 12 includes a second front compartment sensor 121 for detecting a front parking space, and a second camera unit 122 for photographing the second parking space 120. When the first front compartment sensor 111 in the first timing column 11 senses that a moving object enters the second parking compartment 120, the second camera unit 122 of the second timing column 12 is turned on And photograph the vehicle located in the second parking compartment 120 to calculate the parking fee of the vehicle located in the second parking compartment 120.

However, according to the existing license plate recognition system, each timing column needs to include a front car compartment sensor and a camera. When the number of parking compartments to be monitored increases, the cost of building the license plate recognition system will also vary. As the timing columns are installed beside the parking grids, they will also occupy part of the road space, indirectly causing pedestrians or driving sight to be blocked.

Therefore, the purpose of the present invention is to provide an embedded license plate recognition and screening system and its control method.

Therefore, the embedded license plate recognition and screening system of the present invention is applicable to an external device. The embedded license plate recognition and screening system includes a housing unit for installation and embedded in the ground, and a housing unit installed in the housing unit and used for A camera unit that shoots a real-time image diagonally upward, a sending unit for receiving a license plate voucher photo and sending the license plate voucher photo to the external device, and a sending unit that is electrically connected to the camera unit and receives the real-time image in a streaming manner Image processing unit.

The processing unit includes a control module. The control module captures the real-time image as a temporary voucher photo, and screens and extracts the license plate part according to the license plate outline in the temporary voucher photo, and then extracts the license plate part The photo is saved as the license plate voucher photo and transmitted to the sending unit.

Therefore, the control method of the embedded license plate recognition and screening system of the present invention is applicable to an external device. The embedded license plate recognition and screening system includes a camera unit, a processing unit electrically connected to the camera unit, and a processing unit electrically connected to the processing unit The control method includes the following steps:

Start the camera unit, shoot a real-time image and stream it to the processing unit; a control module in the processing unit captures the real-time image as a temporary voucher photo; the control module according to the temporary voucher The license plate outline in the photo is filtered and the license plate part is extracted, and then the photo of the license plate part is saved as a license plate voucher photo and transmitted to the sending unit; the sending unit receives the license plate voucher photo and sends the license plate voucher photo to The external device.

The effect of the embedded license plate recognition and screening system and its control method of the present invention is: by integrating the housing unit, the camera unit, the processing unit, and the sending unit into a license plate recognition and screening system buried in the ground, and capture, The photo of the license plate part is selected as the license plate voucher photo, and only the license plate voucher photo is transmitted to the external device through the sending unit to prevent the outflow of photos other than the license plate part, so that the present invention can reduce the size and protect the privacy of others. The effect of the infringement.

2 and 3, an embodiment of the embedded license plate recognition and screening system 2 of the present invention includes a housing unit 3 arranged and embedded in the ground, a camera unit 4 arranged in the housing unit 3, A sensing unit 41 electrically connected to the camera unit 4, a sending unit 5, and a processing unit 6, and the processing unit 6 includes a register 61 and a control module 62.

In this embodiment, the camera unit 4 is a camera, and faces a corresponding parking compartment 92 obliquely upward, and the camera unit 4 is used to shoot a real-time image.

In this embodiment, the sensing unit 41 is the control module 62 in the processing unit 6 setting an electronic fence in the real-time image for dynamic detection, and determining whether an object enters the parking compartment 92 according to this.

In this embodiment, the sending unit 5 is a wireless communication chipset. The wireless communication chipset receives a license plate certificate photo transmitted by the processing unit 6, and sends the license plate certificate photo to the external device via a wireless network. 91.

In this embodiment, the processing unit 6 is a microprocessor, and the microprocessor includes the register 61 and the control module 62 electrically connected to the camera unit 4. The register 61 receives the real-time image captured by the camera unit 4 in a stream.

In this embodiment, the external device 91 is a block server, which can simultaneously match multiple sets of the embedded license plate recognition and screening system 2 of the present invention, and store it in the block according to the license plate voucher photo and the time parameter transmitted by each system In a corresponding electronic management form in the server, the parking fee is calculated accordingly.

4 and 5, this embodiment of the embedded license plate recognition and screening system 2 of the present invention can be implemented by a control method, and the control method includes steps 701 to 708:

In step 701, the camera unit 4 is activated, the real-time image is captured and transmitted to the register 61 in a streaming manner, and the register 61 transmits the real-time image to the control module 62, and step 702 is continued.

In step 702, the control module 62 detects whether the real-time image in the register 61 is continuous or not, and then detects the frame of the real-time image, and determines that the real-time image corresponds to a specific area of the electronic fence Whether there is an object moving on the screen of 621, the specific area 621 is the range where the control module 62 needs to detect the moving object, so as to reduce the amount of calculation required to detect the object's movement. If the control module 62 detects the movement of an object in the screen of the specific area 621, step 703 is continued. If the control module 62 does not detect the movement of the object in the screen of the specific area 621, step 702 is executed again.

In step 703, the control module 62 captures the frame of the real-time image several times according to the preset interval time, and compares and selects a clearer frame from the frames of the real-time image captured several times , Save as a temporary voucher photo, the control module 62 also saves the current time of accessing the temporary voucher photo as a time parameter, and proceed to step 704.

In step 704, the control module 62 compares and determines whether the temporary certificate photo contains the license plate number according to the English fonts, numeric fonts, and arrangement spacing used in common license plates. If the control module 62 obtains the license plate number from the temporary certificate The license plate number is read in the photo, and step 705 is continued. If the control module 62 fails to recognize that the screen of the specific area 621 contains a license plate number, if an animal or pedestrian movement causes the control module 62 to detect the movement of an object in the step 703, or the control module 62 The group 62 cannot read the license plate number from the temporary voucher photo because the license plate number is not clear enough, and then proceeds to step 708.

In step 705, the control module 62 filters and extracts the license plate part of the temporary certificate photo according to the outline and arrangement spacing of the general license plate and saves it as the license plate certificate photo, and transmits the license plate certificate photo and the time parameter to The sending unit 5 continues with step 706.

In step 706, the control module 62 deletes the temporary voucher photo to ensure that the temporary voucher photo will not be retained, and continues with step 707.

In step 707, the sending unit 5 receives the license plate voucher photo and the time parameter, and sends the license plate voucher photo and the time parameter to the external device 91 for the external device 91 to receive and calculate the license plate voucher photo The time the license plate enters the field.

In step 708, since the control module 62 cannot read the license plate number from the temporary certificate photo, the control module 62 deletes the temporary certificate photo, and transmits a license plate abnormality signal and the time parameter to the sending unit 5. The sending unit 5 also transmits the license plate abnormal signal and the time parameter to the external device 91, and returns to step 702. The external device 91 can obtain information about the failure of the license plate number recognition based on the abnormal signal of the license plate and the time parameter and perform subsequent processing.

To sum up, the embedded license plate recognition and screening system 2 and its control method of the present invention integrate the housing unit 3, the camera unit 4, the processing unit 6, and the sending unit 5, and the camera unit 4 takes pictures The real-time image is streamed to the register 61, so that the processing unit 6 can use the control module 62 to determine whether there is an object moving in the screen of the real-time image, and capture the real-time image The screen is saved as the temporary voucher photo, and then filtered and retrieved according to the license plate outline and saved as the license plate voucher photo. Finally, the control module 62 only transmits the license plate voucher photo to the external device through the sending unit 5 91. To prevent the outflow of photos related to the privacy of others captured by the camera unit 4 buried in the ground, the embedded license plate recognition and screening system 2 and its control method of the present invention integrate the housing unit 3, the camera unit 4, The processing unit 6 and the sending unit 5 can reduce the volume and protect the private photos of others from leaking out, so they can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to Within the scope covered by the patent of the present invention.

11: The first timing bar 110: The first parking space 111: The first front car compartment sensor 112: The first camera unit 12: The second timing bar 120: Second parking compartment 121: The second front car compartment sensor 122: second camera unit 2: Embedded license plate recognition and screening system 3: Housing unit 4: camera unit 41: Sensing unit 5: Sending unit 6: Processing unit 61: register 62: control module 621: specific area 701~708: steps 91: external equipment 92: parking compartment

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a schematic diagram of an existing license plate recognition system; 2 is a system block diagram of an embodiment of the embedded license plate recognition and screening system of the present invention; Figure 3 is a schematic diagram of this embodiment; FIG. 4 is a schematic diagram of the real-time shooting screen in the embodiment; and Fig. 5 is a flow chart of the control method of this embodiment.

4: camera unit

41: Sensing unit

5: Sending unit

6: Processing unit

61: register

62: control module

91: external equipment

Claims (15)

An embedded license plate identification and screening system is suitable for an external device. The embedded license plate identification and screening system includes: A housing unit for setting up and burying in the ground; A camera unit arranged in the housing unit and used for shooting a real-time image diagonally upward; A sending unit for receiving a license plate voucher photo, and sending the license plate voucher photo to the external device; and A processing unit, electrically connected to the camera unit and including a control module, the processing unit receives the real-time image in a streaming manner, the control module captures the real-time image as a temporary voucher photo, and according to the temporary voucher The outline of the license plate in the photo is filtered and the license plate part is retrieved, and then the photo of the license plate part is saved as the license plate certificate photo and transmitted to the sending unit. The embedded license plate recognition and screening system of claim 1, further comprising a sensing unit electrically connected to the camera unit, and when the sensing unit detects that there is an object moving in the range, the control module captures the The real-time image is a photo of the temporary voucher. The embedded license plate recognition and screening system according to claim 1, wherein the processing unit further includes a register electrically connected to the camera unit, and receives real-time images transmitted by the camera unit in a stream. The embedded license plate recognition and screening system according to claim 1, wherein the control module detects whether there is an object in the real-time image frame according to the real-time image frame, and if the real-time image frame is detected When an object moves, the control module captures the real-time image as the temporary voucher photo. The embedded license plate recognition and screening system according to claim 4, wherein the control module detects whether there is an object moving in a specific area in the real-time image according to the real-time image, and if the specific area is detected When an object moves inside, the control module captures the real-time image and saves it as the temporary voucher photo. The embedded license plate recognition and screening system according to claim 1, wherein the control module performs license plate number recognition for the temporary voucher photo, and screens and extracts the license plate part according to the license plate outline in the temporary voucher photo, if The control module cannot read the license plate number from the temporary certificate photo, and the control module transmits a license plate abnormal signal to the sending unit. The embedded license plate recognition and screening system according to claim 1, wherein the control module filters and extracts the license plate part according to the license plate outline in the temporary certificate photo, and then saves it as the license plate certificate photo, the control module The group deletes the temporary voucher photo. The embedded license plate recognition and screening system according to claim 1, wherein the control module judges the current time when the control module recognizes the license plate number in the temporary voucher photo according to the real-time image, and saves it as a time parameter, The license plate voucher photo and the time parameter are transmitted to the sending unit, and the sending unit sends the license plate voucher photo and the time parameter to the external device. A control method of an embedded license plate recognition and screening system is suitable for an external device. The embedded license plate recognition and screening system includes a camera unit, a processing unit electrically connected to the camera unit, and a sending unit electrically connected to the processing unit , The control method includes the following steps: (A) Start the camera unit, shoot a real-time image and stream it to the processing unit; (B) A control module in the processing unit captures the real-time image as a temporary voucher photo; (C) The control module filters and extracts the license plate part based on the license plate outline in the temporary certificate photo, and then saves the license plate part photo as a license plate certificate photo and transmits it to the sending unit; and (D) The sending unit receives the license plate voucher photo, and sends the license plate voucher photo to the external device. The control method of the embedded license plate recognition and screening system according to claim 9, wherein the processing unit further includes a register electrically connected to the camera unit and the control module, and in the step (A), start The camera unit captures the real-time image and transmits it to the register in a streaming manner. The control method of the embedded license plate recognition and screening system as described in claim 9, further comprising a step (E) between the step (B) and the step (C). In the step (E), the control The module recognizes the license plate number based on the temporary certificate photo. If the control module reads the license plate number from the temporary certificate photo, proceed to step (C), if the control module cannot read the temporary certificate photo If the license plate number is issued, the temporary voucher photo is deleted, and an abnormal license plate signal is transmitted to the sending unit. The control method of the embedded license plate recognition and screening system as described in claim 9, further comprising a step (F) located between the step (A) and the step (B). In the step (F), the control The module detects the frame of the real-time image and judges whether there is an object moving in the frame of the real-time image. If there is an object moving in the frame of the real-time image, the step (B) is continued. The control method of the embedded license plate recognition and screening system according to claim 12, wherein, in the step (F), the control module detects a specific area in the real-time image, and determines whether the specific area has Object movement. If an object movement is detected in the specific area, the step (B) is continued. In the step (B), the control module captures the real-time image as the temporary voucher photo. The control method of the embedded license plate recognition and screening system as described in claim 9, further comprising a step (G) between the step (C) and the step (D). In the step (G), the control The module deletes the temporary certificate photo. The control method of the embedded license plate recognition and screening system as described in claim 9, further comprising a step (H) between the step (B) and the step (C). In the step (H), the control Based on the real-time image, the module judges that the control module recognizes the current time of the license plate number in the temporary voucher photo, and saves it as a time parameter. In this step (C), the control module is based on the temporary voucher photo. The license plate outline of the license plate, filter and extract the license plate part, save it as the license plate voucher photo, and transmit the license plate voucher photo and the time parameters to the sending unit. In step (D), the sending unit receives the license plate voucher The photo and the time parameter, and send the license plate voucher photo and the time parameter to the external device.

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