CN116095467A

CN116095467A - Access control method and device, storage medium and digital video acquisition equipment

Info

Publication number: CN116095467A
Application number: CN202111296466.7A
Authority: CN
Inventors: 肖旭; 陈立辉
Original assignee: Zhejiang Uniview Technologies Co Ltd
Current assignee: Zhejiang Uniview Technologies Co Ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2023-05-09

Abstract

An access control method and device, a storage medium and a digital video acquisition device, wherein the access control method is applied to the digital video acquisition device and comprises the following steps: when a camera is detected, and the combination of the resolution and the frame rate of the camera exceeds the access capability of the digital video acquisition device under interlaced acquisition, adjusting the sampling resolution of the digital video acquisition device to be a first resolution, and adjusting the frame rate of the digital video acquisition device to be the frame rate of the camera, wherein the combination of the first resolution and the frame rate meets the access capability of the digital video acquisition device. According to the scheme provided by the embodiment, the sampling resolution can be adjusted, and the camera can be accessed.

Description

Access control method and device, storage medium and digital video acquisition equipment

Technical Field

The present disclosure relates to monitoring technologies, and in particular, to an access control method and apparatus, a storage medium, and a digital video acquisition device.

Background

Hard disk recorders (Digital Video Recorder, DVR for short), digital video recorders, use hard disk recordings as opposed to conventional analog video recorders, and are often referred to as hard disk recorders. The system is a set of computer system for storing and processing images, and has the functions of long-time video recording, remote monitoring and controlling of images/voices. The DVR adopts a digital recording technology, is far superior to analog monitoring equipment in aspects of image processing, image storage, retrieval, backup, network transmission, remote control and the like, represents the development direction of a television monitoring system and is a preferred product of the television monitoring system on the market.

With the continuous improvement of the resolution and frame rate of security cameras, customers are increasingly demanding low-performance DVR access to high-resolution cameras.

Disclosure of Invention

The embodiment of the application provides an access control method, an access control device and a storage medium, and digital video acquisition equipment can realize access to a high-resolution camera.

The embodiment of the application provides an access control method which is applied to digital video acquisition equipment and comprises the following steps:

when a camera is detected, and the combination of the resolution and the frame rate of the camera exceeds the access capability of the digital video acquisition device under interlaced acquisition, adjusting the sampling resolution of the digital video acquisition device to be a first resolution, and adjusting the frame rate of the digital video acquisition device to be the frame rate of the camera, wherein the combination of the first resolution and the frame rate meets the access capability of the digital video acquisition device.

In an exemplary implementation, the method further comprises: and displaying a control interface of the camera, receiving an instruction input by a user based on the control interface, and controlling the camera according to the instruction.

In an exemplary implementation, the receiving the instruction input by the user based on the control interface, and controlling the camera according to the instruction includes:

receiving an instruction which is input by the user based on the control interface and used for reducing the frame rate of the camera to a target frame rate, and controlling the frame rate of the camera to be reduced to the target frame rate;

the method further comprises the steps of: after detecting that the frame rate of the camera changes to the target frame rate, adjusting the sampling resolution of the digital video acquisition equipment to be a second resolution, and adjusting the frame rate of the digital video acquisition equipment to be the target frame rate, wherein the combination of the second resolution and the target frame rate meets the access capability of the digital video acquisition equipment.

In an exemplary implementation, before the receiving the instruction input by the user based on the control interface and controlling the camera according to the instruction, the method further includes:

and determining the target frame rate according to the resolution and the frame rate of the camera and the access capability of the digital video acquisition equipment, and outputting prompt information for adjusting the frame rate of the camera to the target frame rate.

In an exemplary implementation, the digital video acquisition device includes a first mode and a second mode, and the first mode supports sampling resolution and frame rate changes, and the second mode does not support sampling resolution and frame rate changes;

before the adjusting the sampling resolution of the digital video acquisition device to the first resolution, the method further comprises: and the digital video acquisition equipment receives an instruction input by a user to enter a first mode and controls the digital video acquisition equipment to enter the first mode.

In an exemplary implementation, the controlling the camera according to the instructions includes: and generating a PTZ command word according to the instruction, and controlling the camera through the PTZ command word.

In an exemplary implementation, the PTZ command word is a PTZ command word that satisfies one of the following protocols: analog high definition protocols, transmission video interfaces, and composite video interfaces.

An embodiment of the present disclosure provides an access control apparatus, including a memory and a processor, where the memory stores a program, and the program, when read and executed by the processor, implements the access control method described in any one of the foregoing embodiments.

The disclosed embodiments provide a computer readable storage medium storing one or more programs executable by one or more processors to implement the access control method described in any of the above embodiments.

The embodiment of the disclosure provides a digital video acquisition device, comprising: the detecting element and adjustment unit, wherein:

the detection unit is configured to detect a camera, acquire the resolution and the frame rate of the camera, and send the resolution and the frame rate to the adjustment unit;

the adjusting unit is configured to adjust a sampling resolution of the digital video acquisition device to a first resolution and adjust a frame rate of the digital video acquisition device to a frame rate of the camera when a combination of the resolution and the frame rate of the camera exceeds an access capability of the digital video acquisition device under interlaced acquisition, wherein the combination of the first resolution and the frame rate satisfies the access capability of the digital video acquisition device.

Compared with the related art, the embodiment of the application comprises an access control method and device, a storage medium and digital video acquisition equipment, wherein the access control method is applied to the digital video acquisition equipment and comprises the following steps: when a camera is detected, and the combination of the resolution and the frame rate of the camera exceeds the access capability of the digital video acquisition device under interlaced acquisition, adjusting the sampling resolution of the digital video acquisition device to be a first resolution, and adjusting the frame rate of the digital video acquisition device to be the frame rate of the analog camera, wherein the combination of the first resolution and the frame rate meets the access capability of the digital video acquisition device. According to the scheme provided by the embodiment, the sampling resolution can be adjusted, the access of the camera is realized, various types of cameras can be supported, and the access control of the high-performance camera by the digital video acquisition equipment with lower performance can be realized.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. Other advantages of the present application may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide an understanding of the technical aspects of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present application and together with the examples of the present application, and not constitute a limitation of the technical aspects of the present application.

Fig. 1 is a flowchart of an access control method provided in an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an analog camera access provided by an exemplary embodiment;

fig. 3 is a flowchart of an access control method according to an exemplary embodiment;

fig. 4 is a block diagram of an access control device according to an exemplary embodiment;

FIG. 5 is a block diagram of a computer-readable storage medium provided by an exemplary embodiment;

fig. 6 is a block diagram of a digital video capture device according to an exemplary embodiment.

Detailed Description

The present application describes a number of embodiments, but the description is illustrative and not limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or in place of any other feature or element of any other embodiment unless specifically limited.

The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements of the present disclosure may also be combined with any conventional features or elements to form a unique inventive arrangement as defined in the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive arrangements to form another unique inventive arrangement as defined in the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Further, various modifications and changes may be made within the scope of the appended claims.

Furthermore, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other sequences of steps are possible as will be appreciated by those of ordinary skill in the art. Accordingly, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Furthermore, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.

Currently, cameras accessing full channel 200W (200 ten thousand) pixels are supported on cost-effective 8-way DVR devices on the mainstream market. With the downward exploration of the cost of a 500W pixel camera, the 8-way DVR accesses the pain point of the 500W pixel camera that becomes a customer. Because a piece of analog-to-digital conversion (AD) chip and one BT656 port collect data volume of maximum 2 200w@30 frames, two ADs and two BT656 ports collect data volume of maximum 2x2 200w@30 frames, namely 2x 200w×30; it is impossible to access 8 paths of 500w@20 frame cameras (8 x 500w x 20) simultaneously. I.e., the low-performance DVR device cannot access the high-resolution camera for previewing, encoding, and storage.

In the scheme, when AD analog-to-digital conversion is carried out, the image is subjected to wide interlacing acquisition, for example, the image with 500W (2592 x 1944) resolution is subjected to wide interlacing acquisition to 1296x1944, and meanwhile, the same resolution is configured when a digital signal is acquired at the main control end of the DVR, so that the data volume acquired in each path is reduced, and the effect of camera access is achieved. But currently the main stream 500W camera is usually 20 frames, and even if the accesses are acquired by interlacing, each path 500W access is 12 frames (2 x1920x1080x30/4x1296x 1944) at most.

In the embodiment of the disclosure, the access of the camera is realized by changing the sampling resolution, and after the access, the control interface of the camera is displayed, so that the control of the camera is realized.

Fig. 1 is a flowchart of an access control method provided in an embodiment of the present disclosure. As shown in fig. 1, an access control method provided by an embodiment of the present disclosure is applied to a digital video acquisition device, and includes:

step 101, when a camera is detected, and the combination of the resolution and the frame rate of the camera exceeds the access capability of the digital video acquisition device under interlaced acquisition, adjusting the sampling resolution of the digital video acquisition device to be a first resolution, and adjusting the frame rate of the digital video acquisition device to be the frame rate of the camera, wherein the combination of the first resolution and the frame rate meets the access capability of the digital video acquisition device.

According to the scheme provided by the embodiment, the sampling resolution can be adjusted, the access of the camera is realized, multiple types of cameras can be supported, and the access control of the high-performance camera by the digital video acquisition equipment with lower performance can be realized.

The combination of the resolution and frame rate of the camera exceeding the access capability of the digital video acquisition device under interlaced acquisition comprises: the resolution of the camera is a frame rate that exceeds the maximum value of the product of the resolution and the frame rate supported by the digital video acquisition device under interlaced acquisition.

The combination of the first resolution and the frame rate satisfying the access capability of the digital video acquisition device comprises: the first resolution is equal to or less than a maximum value of a product of a resolution and a frame rate supported by the digital video acquisition device.

In an exemplary embodiment, the method further comprises:

step 102, displaying a control interface of the camera, receiving an instruction input by a user based on the control interface, and controlling the camera according to the instruction.

The scheme provided by the embodiment can display the control interface of the camera and realize the control of the camera.

In an exemplary embodiment, the digital video capture device is such as a DVR.

In an exemplary embodiment, the adjusting the sampling resolution of the digital video acquisition device to the first resolution may include: the first resolution is determined from the access capability of the digital video acquisition device and the frame rate of the camera such that the combination of the first resolution and the frame rate of the camera is as close as possible to the access capability of the digital video acquisition device.

In an exemplary embodiment, the digital video acquisition device includes a first mode and a second mode, and the first mode supports sampling resolution and frame rate changes, and the second mode does not support sampling resolution and frame rate changes;

The first mode is, for example, a secure mode and the second mode is, for example, a normal user mode. Namely, a working mode is added, the sampling resolution, the frame rate and the like can be modified only in the mode, the sampling resolution, the frame rate and the like can not be modified in the other modes, and the safety can be improved. The two modes are only examples herein, and more modes may be included, and the embodiments of the present disclosure are not limited thereto. In another embodiment, the sampling rate and frame rate may be changed directly in the normal user mode without setting the security mode.

In an exemplary embodiment, the receiving the instruction input by the user based on the control interface, and controlling the camera according to the instruction includes:

the method further comprises the steps of: after detecting that the frame rate of the camera changes to the target frame rate, adjusting the sampling resolution of the digital video acquisition device to a second resolution, and adjusting the frame rate of the digital video acquisition device to the target frame rate, wherein the combination of the second resolution and the target frame rate meets the access capability of the digital video acquisition device. Wherein the combination of the second resolution and the target frame rate satisfies the access capability of the digital video acquisition device comprises: the second resolution is equal to or less than a maximum value of a product of the resolution and the frame rate supported by the digital video acquisition device.

The scheme provided by the embodiment can realize that the user modifies the frame rate of the camera; in addition, the digital video acquisition device can increase the sampling resolution after the user reduces the frame rate of the camera, thereby obtaining a high resolution image. The embodiments of the present disclosure are not limited thereto, and the user may perform other control on the camera than modifying the frame rate based on the control interface.

In an exemplary embodiment, before the receiving the instruction input by the user based on the control interface and controlling the camera according to the instruction, the method further includes:

and determining the target frame rate according to the resolution and the frame rate of the camera and the access capability of the digital video acquisition equipment, and outputting prompt information for adjusting the frame rate of the camera to the target frame rate. According to the scheme provided by the embodiment, the target frame rate can be determined according to the access capability of the digital video acquisition equipment, and a user is prompted to change the frame rate of the camera to the target frame rate, so that the optimal access effect is achieved. However, embodiments of the present disclosure are not limited thereto, and may not be prompted, and the user may change the frame rate by himself. When the frame rate after the user is changed is matched with the resolution of the camera to still exceed the access capability of the digital video acquisition equipment, prompting the user to reduce the frame rate until the frame rate and the resolution of the camera meet the access capability of the digital video acquisition equipment.

In an exemplary embodiment, the controlling the camera according to the instructions includes: and generating a PTZ (Pan/Tilt/Zoom) command word according to the instruction, and controlling the camera through the PTZ command word. In this embodiment, communication between the DVR and the camera is realized based on the PTZ protocol.

In an exemplary embodiment, the PTZ command word is a PTZ command word satisfying one of the following protocols: analog high definition protocol (AnalogHighDefinition, AHD), transmission video interface (Transport Video Interface, TVI) and composite video interface (Composite Video Interface, CVI). Namely, the scheme provided by the embodiment of the disclosure can support the access of cameras with various formats.

The technical scheme of the embodiment of the present disclosure is further described below by a specific example.

As shown in fig. 2, in this embodiment, the DVR includes an AD conversion module and a main control module, and the camera accesses the 8-path DVR through the AD conversion module and the BT656 interface, where the DVR may use the Hi20DV400 platform, and there are 2 BT656 accesses, and each BT656 accesses 4 cameras, and the total access capability is 2x2x1920x1080x30, and the supported maximum access resolution is 5m@12 frames (i.e. the pixel is 5M, the frame rate is 12 frames/s), 4m@15 frames, and 2m@30 frames.

The camera of 5M@20frame is through 8 BNC (Bayonet Nut Connector ) interfaces access DVR, and the DVR uses wide interlaced collection mode can't satisfy the access data volume this moment, and the device of DVR can't gather the image. The DVR may prompt the user to enter a secure mode in order to adjust the sampling resolution, or may not prompt, actively enter a secure mode when the user finds that the image cannot be previewed, or the DVR may autonomously enter a secure mode, etc.

As shown in fig. 3, the access control method provided in this embodiment includes:

step 301, a DVR receives a command of entering a safe mode from a user and enters the safe mode;

step 302, obtaining the resolution and frame rate of a camera;

step 303, judging whether the resolution and frame rate of the camera are greater than the maximum access capability of the DVR interlace acquisition, if not, executing step 304; if so, go to step 305;

in this embodiment, the DVR supports a camera accessing 5m@12 frames under interlaced acquisition, and the actual accessed camera is 5m@20, which exceeds the access capability under interlaced acquisition.

Step 304, normal acquisition or interlaced acquisition, exiting the safety mode, entering the normal user mode, and ending;

in step 305, the dvr configures AD and the master control to perform interlacing again on the basis of wide interlacing, that is 2592/4=648, that is, the sampling resolution is adjusted to 648x1944, and the frame rate is consistent with the frame rate of the camera and is 20 frames/s, so that the image of the preview camera is normally accessed. The preview screen includes a control interface for the camera.

The adjusted sampling resolution values are only examples, and can be adjusted to other resolutions as needed. In addition, the access capabilities of DVRs herein are merely examples, and may be DVRs of other access capabilities and cameras of other resolutions and frame rates.

Step 306, displaying a control interface of the camera, receiving an instruction for adjusting the frame rate input by a user based on the control interface, generating a standard pan-tilt command word of AHD, TVI or CVI according to the instruction, and adjusting the frame rate of the camera to 12 frames/s. At this time, the resolution and frame rate of the camera are 500W@12, which is within the access capability of DVR interlaced acquisition.

In step 307, the DVR senses the system change of the camera (in this embodiment, the frame rate of the camera is changed), adjusts and changes the sampling resolution to 1296x1944, the frame rate to 12 frames consistent with the camera, and increases the sampling resolution, so that better preview and encoding effects can be achieved, the DVR exits the secure mode, enters the normal user mode, and ends.

Wherein 1296x1944@12 frames satisfy the access capability of the DVR. When the sampling resolution and the frame rate of the DVR are 1296x1944@12 frames, under the interlaced acquisition, the acquisition of the image of the camera with 500W@12 frames can be realized.

According to the scheme provided by the embodiment, through the addition of the safety mode, the flexibility of AD and main control image sampling and the PTZ standard AHD, TVI, CVI PTZ command word of the PTZ are fully utilized in the mode, the more general adjustment scheme for high-resolution camera access is completed, and the preview and coding of the camera are realized through adjusting the frame rate.

As shown in fig. 4, an embodiment of the present disclosure provides an access control apparatus 40, including a memory 410 and a processor 420, where the memory 410 stores a program, and the program implements the access control method described in any one of the embodiments above when read and executed by the processor 420.

For example, processor 420 is coupled to memory 410 via a bus system, which may be a conventional serial, parallel communication bus, etc., as the embodiments of the present disclosure are not limited in this regard.

For example, the processor 420 may be a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an image processor (GPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, may be a general-purpose processor or a special-purpose processor, and may control other components in the access control device 40 to perform desired functions.

Memory 410 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, random Access Memory (RAM) and/or cache memory (cache), and the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, and the like. One or more computer program instructions may be stored on a computer readable storage medium that can be executed by the processor 420 to perform the functions (implemented by the processor 420) and/or other desired functions in the disclosed embodiments.

It should be noted that, for clarity and brevity, not all of the constituent elements of the access control apparatus 40 are given in the embodiment of the present disclosure. Other constituent elements not shown may be provided and arranged according to specific needs by those skilled in the art in order to realize the necessary functions of the access control device 40, and the embodiments of the present disclosure are not limited thereto.

As shown in fig. 5, the embodiment of the present disclosure provides a computer-readable storage medium 50, where the computer-readable storage medium 50 stores one or more programs 51, and the one or more programs 51 may be executed by one or more processors to implement the access control method described in any of the embodiments above.

As shown in fig. 6, an embodiment of the present disclosure provides a digital video capturing apparatus, including: a detection unit 601 and an adjustment unit 602, wherein:

the detection unit 601 is configured to detect a camera, acquire a resolution and a frame rate of the camera, and send the resolution and the frame rate to the adjustment unit 602;

the adjusting unit 602 is configured to adjust the sampling resolution of the digital video capturing device to a first resolution and adjust the frame rate of the digital video capturing device to the frame rate of the camera when the combination of the resolution and the frame rate of the camera exceeds the access capability of the digital video capturing device, wherein the combination of the first resolution and the frame rate satisfies the access capability of the digital video capturing device.

In an exemplary embodiment, the digital video capturing apparatus further comprises an operation unit 603, wherein:

the operation unit 603 is configured to display a control interface of the camera, receive an instruction input by a user based on the control interface, and control the camera according to the instruction.

In an exemplary embodiment, the operation unit 603 receives an instruction input by a user based on the control interface, and controlling the camera according to the instruction includes: receiving an instruction which is input by the user based on the control interface and used for reducing the frame rate of the camera to a target frame rate, and controlling the frame rate of the camera to be reduced to the target frame rate;

the adjustment unit 602 is further configured to: after detecting that the frame rate of the camera changes to the target frame rate, adjusting the sampling resolution of the digital video acquisition equipment to be a second resolution, and adjusting the frame rate of the digital video acquisition equipment to be the target frame rate, wherein the combination of the second resolution and the target frame rate meets the access capability of the digital video acquisition equipment.

The detection unit 601 and the adjustment unit 602 may perform step 101 of the access control method as shown in fig. 1, and the operation unit 603 may perform step 102 of the access control method as shown in fig. 1.

The detection unit 601, the adjustment unit 602 and the operation unit 603 may be hardware, software, firmware or any feasible combination thereof. For example, the detecting unit 601, the adjusting unit 602, and the operating unit 603 may be dedicated or general-purpose circuits, chips, devices, or the like, or may be a combination of a processor and a memory. With respect to the specific implementation forms of the detection unit 601, the adjustment unit 602, and the operation unit 603, embodiments of the present disclosure are not limited thereto. The specific function of the digital video capturing device may refer to the related description of the foregoing access control method, which is not repeated here. The components and structures of the digital video acquisition device shown in fig. 6 are exemplary only and not limiting, and the access control device may also include other components and structures as desired.

Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.

Claims

1. An access control method, applied to a digital video acquisition device, comprising:

2. The access control method according to claim 1, characterized in that the method further comprises: and displaying a control interface of the camera, receiving an instruction input by a user based on the control interface, and controlling the camera according to the instruction.

3. The access control method according to claim 2, wherein the receiving an instruction input by the user based on the control interface, and controlling the camera according to the instruction comprises:

4. The access control method according to claim 3, wherein the receiving the instruction input by the user based on the control interface, before controlling the camera according to the instruction, further comprises:

5. The access control method of claim 1, wherein the digital video acquisition device comprises a first mode and a second mode, and wherein the first mode supports sampling resolution and frame rate changes and the second mode does not support sampling resolution and frame rate changes;

6. The access control method according to claim 2, wherein the controlling the camera according to the instruction comprises: and generating a PTZ command word according to the instruction, and controlling the camera through the PTZ command word.

7. The access control method of claim 6, wherein the PTZ command word is a PTZ command word satisfying one of the following protocols: analog high definition protocols, transmission video interfaces, and composite video interfaces.

8. An access control device comprising a memory and a processor, the memory storing a program which, when read by the processor for execution, implements the access control method of any of claims 1 to 7.

9. A computer-readable storage medium storing one or more programs executable by one or more processors to implement the access control method of any of claims 1 to 7.

10. A digital video acquisition device, comprising: the detecting element and adjustment unit, wherein: