WO2020114235A1 - 一种pt坐标与gps坐标的转换方法及球机 - Google Patents
一种pt坐标与gps坐标的转换方法及球机 Download PDFInfo
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- WO2020114235A1 WO2020114235A1 PCT/CN2019/119269 CN2019119269W WO2020114235A1 WO 2020114235 A1 WO2020114235 A1 WO 2020114235A1 CN 2019119269 W CN2019119269 W CN 2019119269W WO 2020114235 A1 WO2020114235 A1 WO 2020114235A1
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 title abstract description 24
- 238000012544 monitoring process Methods 0.000 claims description 112
- 230000006870 function Effects 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 3
- 101100536354 Drosophila melanogaster tant gene Proteins 0.000 description 5
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- 238000010586 diagram Methods 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/08—Projecting images onto non-planar surfaces, e.g. geodetic screens
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
Definitions
- This application relates to the field of security technology, in particular to a method for converting PT coordinates and GPS coordinates and a dome camera.
- the conversion scheme generally includes: calculating the mapping relationship between the camera coordinate system and the GPS coordinate system according to the coordinates of the same set of calibration points in the camera coordinate system and the GPS coordinates; then, according to the mapping relationship, the camera coordinates can be converted into GPS Coordinates, or convert GPS coordinates to camera coordinates.
- the embodiment of the present application provides a method for converting PT coordinates and GPS coordinates and a dome camera, so as to perform coordinate conversion for the dome camera.
- An embodiment of the present application provides a method for converting PT coordinates to GPS coordinates, including:
- the GPS coordinates of the monitoring target are calculated based on the latitude and longitude of the dome camera and the distances in the longitude and latitude directions.
- the acquiring the PT coordinates when the dome camera shoots the monitoring target as the first P coordinates and the first T coordinates includes:
- the PT coordinates when the dome camera is facing the monitoring target as the first P coordinate and the first T coordinate.
- the determining the horizontal angle between the monitoring target and the specified direction based on the first P coordinate includes:
- the difference between the first P coordinate and the second P coordinate is calculated as the horizontal angle between the monitoring target and the specified direction.
- calculating the horizontal distance between the monitoring target and the dome camera based on the first T coordinate and the height of the dome camera includes:
- the specified direction is true north
- calculating the meridian distance and the latitude direction distance between the monitoring target and the dome camera through a trigonometric function includes:
- an embodiment of the present application provides a method for converting PT coordinates to GPS coordinates, including:
- the specified direction is true north
- the calculation of the horizontal angle between the monitoring target and the specified direction by a trigonometric function according to the distance of the longitude direction and the distance of the latitude direction includes:
- calculating the T coordinate of the dome camera according to the horizontal distance and the height of the dome camera includes:
- the T coordinate of the ball machine is solved by the tangent of the T coordinate of the ball machine.
- the method further includes:
- the horizontal error is reduced by adjusting the electronic compass of the dome camera.
- the method further includes:
- the vertical error is reduced by adjusting the height value of the dome camera.
- An embodiment of the present application provides a dome camera, including an image collector, a processor, and a memory;
- Image collector used to collect images, and use the collected images as images to be processed
- Memory used to store computer programs
- the processor is used to implement any one of the conversion methods between PT coordinates and GPS coordinates when executing the program stored in the memory.
- the PT coordinates of the dome camera when shooting the monitoring target are obtained; based on the P coordinate, the horizontal angle between the monitoring target and the specified direction is determined; based on the coordinates and the height of the dome camera, the level of the monitoring target and the dome camera is calculated Distance; according to the horizontal angle and the horizontal distance, the triangulation function is used to calculate the meridian distance and the latitude direction distance between the monitoring target and the dome camera; based on the latitude and longitude of the dome camera and the longitude and latitude direction distances, the GPS coordinates of the monitoring target are calculated. It can be seen that this solution realizes the conversion of the PT coordinates of the ball machine into GPS coordinates and the coordinate conversion for the ball machine.
- FIG. 1 is a schematic flowchart of a first conversion method of PT coordinates and GPS coordinates provided by an embodiment of the present application;
- FIG. 2 is a schematic diagram of vertical direction conversion in an embodiment of the present application.
- FIG. 3 is a schematic diagram of horizontal direction conversion in an embodiment of the present application.
- FIG. 4 is a schematic flowchart of a second conversion method of PT coordinates and GPS coordinates provided by an embodiment of the present application
- FIG. 5 is a schematic structural diagram of a dome camera provided by an embodiment of the present application.
- the embodiments of the present application provide a method for converting PT coordinates and GPS coordinates and a dome camera.
- the method can be applied to the dome camera or other electronic devices connected to the dome camera, such as , Mobile phones, computers, etc., no specific restrictions.
- the first method for converting PT coordinates to GPS coordinates provided in the embodiments of the present application is described in detail below.
- the method for converting PT coordinates to GPS coordinates is also a method for converting PT coordinates to GPS coordinates.
- FIG. 1 is a schematic flowchart of a first conversion method of PT coordinates and GPS coordinates provided by an embodiment of the present application, including:
- S101 Obtain the PT coordinates when the dome camera shoots the monitoring target, as the first P coordinates and the first T coordinates.
- the dome camera coordinate system is usually a PTZ (Pan/Tilt/Zoom, pan/tilt/zoom movement, lens zoom, zoom control) coordinate system.
- the monitoring target in the embodiment shown in FIG. 1 is a target that needs to determine GPS coordinates, that is, it is necessary to convert the PT coordinates when the dome camera shoots the monitoring target into the GPS coordinates of the monitoring target.
- the P coordinate when the dome camera shoots the monitoring target is called the first P coordinate
- the T coordinate when the dome camera shoots the monitoring target is called the first T coordinate.
- the PT coordinates of the dome camera when shooting the monitoring target can be directly read as the first P coordinate and the first T coordinate.
- the image coordinates of the monitoring target in the image captured by the dome camera can be obtained; according to the image coordinates and the angle of view when the dome camera captures the monitoring target, it is determined that the dome camera is directly facing
- the PT coordinates when monitoring the target are used as the first P coordinates and the first T coordinates.
- the PT coordinates are converted into PT coordinates when the dome camera is directly facing the monitoring target, as first P coordinates and first T coordinates.
- the GPS coordinates of the monitoring target obtained are more accurate.
- the first P coordinate and the first T coordinate obtained by applying this embodiment are PT coordinates when the dome camera is directly facing the monitoring target. Therefore, with this embodiment, more accurate GPS coordinates can be obtained.
- the first P coordinate and the first T coordinate can be converted using the following formula:
- Pan_tar Pan_cur+arctan((2*X/L 1 -1)*tan( ⁇ 1 /2));
- Tilt_tar Tilt_cur+arctan((2*Y/L 2 -1)*tan( ⁇ 2 /2));
- Pan_tar represents the first P coordinate
- Tilt_tar represents the first T coordinate
- Pan_cur represents the horizontal angle of the current ball machine in the PT coordinate system, that is, the P coordinate read above
- Tilt_cur represents the current ball machine in the PT coordinate system
- the vertical direction angle in, that is, the T coordinate read above, (Pan_cur, Tilt_cur) is the coordinate of the current image center position
- L 1 represents the total number of pixels in the horizontal direction of the image
- L 2 represents the total number of pixels in the horizontal direction of the image
- ⁇ 1 represents the horizontal angle of view corresponding to the current image
- ⁇ 2 represents the vertical angle of view corresponding to the current image
- the XY coordinate system uses the upper left corner of the image as the origin and pixels as the unit.
- S102 Determine the horizontal angle between the monitoring target and the specified direction based on the first P coordinate.
- the designated direction may be a true north direction, a true south direction, a true east direction, or a true west direction, which is not specifically limited.
- step S102 may include: obtaining the P-coordinate of the dome camera when the dome camera is pointing in a specified direction through the electronic compass of the dome camera as the second P-coordinate; calculating the first P-coordinate and the first The difference between the two P coordinates is the horizontal angle between the monitoring target and the specified direction.
- the electronic compass of the dome camera you can obtain the P-coordinates of the dome camera when the dome camera points to the north, south, east, and west directions.
- the second P coordinate The difference between the first P coordinate and the second P coordinate is the horizontal angle between the monitoring target and the specified direction.
- S103 Calculate the horizontal distance between the monitoring target and the dome camera based on the first T coordinate and the height of the dome camera.
- step S102 and step S103 are not limited.
- the product of the tangent of the first T coordinate and the height of the dome can be calculated as the horizontal distance between the monitoring target and the dome.
- tanT*h L
- h represents the height of the dome camera
- L represents the horizontal distance between the monitoring target and the dome camera.
- the horizontal distance is the distance between the dome camera and the monitoring target under the assumption that the dome camera and the monitoring target have the same height.
- a trigonometric function is used to calculate the distance in the meridian direction and the distance in the latitude direction between the monitoring target and the dome camera.
- step S104 may include: calculating the product of the sine value of the horizontal angle and the horizontal distance as the monitoring target and all The distance in the meridian direction of the dome camera; calculate the product of the cosine of the horizontal angle and the horizontal distance as the distance in the latitude direction between the monitoring target and the dome camera.
- FIG. 3 is a top view of the dome camera.
- the height of the dome camera is not shown in FIG. 3.
- L*sin ⁇ L lon
- L*cos ⁇ L lat
- L represents the level calculated in step S103 Distance
- ⁇ represents the horizontal angle between the monitoring target obtained in step S102 and the true north direction
- L lon represents the distance between the monitoring target and the dome in the longitude direction
- L lat represents the distance between the monitoring target and the dome in the latitude direction.
- step S104 may include: calculating the product of the cosine of the horizontal angle and the horizontal distance as the monitoring target and the ball machine’s The distance in the meridian direction; calculate the product of the sine of the horizontal angle and the horizontal distance as the distance in the latitude direction between the monitoring target and the dome camera.
- step S102 may be true west or true south, and the specific calculation process is similar and will not be repeated here.
- S105 Calculate the GPS coordinates of the monitoring target based on the latitude and longitude of the dome camera and the distances in the meridian direction and the latitude direction.
- the dome camera usually has a GPS positioning device, and the GPS coordinates of the dome camera can be obtained based on the GPS positioning device.
- the GPS coordinates include the latitude and longitude.
- the latitude and longitude of the monitoring target can be calculated, and the GPS coordinates of the monitoring target can be obtained.
- the PT coordinates when the dome camera shoots the monitoring target are obtained; based on the P coordinate, the horizontal angle between the monitoring target and the specified direction is determined; based on the T coordinate and the height of the dome camera, the monitoring target is calculated The horizontal distance from the dome camera; according to the horizontal angle and horizontal distance, the triangulation function is used to calculate the longitude and latitude distance between the monitoring target and the dome camera; based on the latitude and longitude of the dome camera and the longitude and latitude direction distances, the monitoring is calculated The GPS coordinates of the target. It can be seen that in this solution, the PT coordinates of the dome camera are converted into GPS coordinates, and the coordinate conversion for the dome camera is implemented.
- the conversion method of PT coordinates and GPS coordinates includes:
- S401 Calculate the meridian distance and the latitude direction distance between the dome camera and the monitoring target according to the GPS coordinates of the monitoring target and the GPS coordinates of the dome camera photographing the monitoring target.
- the GPS coordinates include latitude and longitude.
- the difference between the longitude of the monitoring target and the dome camera is the calculated distance in the meridian direction, and the difference in the latitude of the monitoring target and the dome camera is the calculated distance in the latitude direction.
- S402 Calculate the horizontal distance between the monitoring target and the dome camera based on the longitude direction distance and the latitude direction distance.
- the horizontal distance is the distance between the dome camera and the monitoring target under the assumption that the dome camera and the monitoring target have the same height.
- the ground can be regarded as a plane, and the horizontal distance between the monitoring target and the dome camera can be calculated using the following formula:
- Aw represents the latitude of the monitoring target
- Aj represents the longitude of the monitoring target
- Bw represents the latitude of the dome
- Bj represents the longitude of the dome
- L represents the horizontal distance between the monitoring target and the dome
- R represents the location of the dome Earth radius.
- the ground can be regarded as a spherical surface, and the spherical sine and cosine formula can be used to calculate the horizontal distance between the monitoring target and the ball machine, that is, the spherical distance.
- the horizontal distance between the monitoring target and the dome camera There are many ways to calculate the horizontal distance between the monitoring target and the dome camera, and they are not listed one by one.
- S403 Based on the distance in the longitude direction and the distance in the latitude direction, calculate the horizontal angle between the monitoring target and the specified direction through a trigonometric function.
- step S403 may include: calculating the ratio of the distance in the latitude direction to the distance in the longitude direction as the tangent of the horizontal angle; Tangent value, solve the horizontal angle.
- tan ⁇ distance in the latitude direction/distance in the longitude direction, where ⁇ is the horizontal angle between the monitoring target and the true east direction.
- the specified direction may also be true west or true south, and the specific calculation process is similar and will not be repeated here.
- S404 Determine the P coordinate of the dome camera according to the horizontal angle.
- the P coordinate of the dome can be understood as the angle of the dome in the horizontal direction. Knowing the horizontal angle between the dome and the specified direction, the angle of the dome in the horizontal direction can be determined and the P coordinate of the dome can be obtained. Among them, the specified direction can be such as true north.
- S405 Calculate the T coordinate of the dome camera according to the horizontal distance and the height of the dome camera.
- Step S405 may be performed after step S402, and the execution order of step S402 and step S403-step S404 is not limited.
- the ratio of the horizontal distance to the height of the dome can be calculated as the tangent of the T coordinate of the dome; the tangent of the T coordinate of the dome can be used to solve the ball The T coordinate of the machine.
- tanT*h L
- h represents the height of the ball machine
- L represents the horizontal distance between the monitoring target and the ball machine
- T represents the T coordinate of the ball machine.
- the T coordinate of the ball machine can be calculated according to this formula.
- the GPS coordinates of the monitoring target can be converted into the PT coordinates of the dome camera.
- the horizontal error is reduced by adjusting the electronic compass of the ball machine.
- the vertical error is reduced by adjusting the height value of the dome camera.
- the height of the dome camera in the above embodiments may be pre-configured in the dome camera.
- the pre-configured height value may have errors.
- the vertical error can be reduced by adjusting the height value configured in the dome camera.
- the inventor found through experiments that by adjusting the electronic compass of the ball machine, the horizontal error of coordinate conversion can be reduced, and by adjusting the height value of the ball machine, the vertical error of coordinate conversion can be reduced.
- the error of coordinate conversion is corrected overall, but the error correction in different directions will affect each other.
- different parameters can be adjusted to realize the correction of errors in different directions, which reduces this mutual influence and improves the accuracy of error correction.
- the GPS coordinates of the monitoring target are converted into the PT coordinates of the ball machine, and the coordinate conversion for the ball machine is realized.
- An embodiment of the present application further provides a dome camera. As shown in FIG. 5, it includes an image collector 501, a processor 502, and a memory 503;
- the image collector 501 is used to collect images and use the collected images as images to be processed;
- the processor 502 is used to implement any one of the conversion methods between PT coordinates and GPS coordinates when executing the program stored in the memory.
- the above image collector may include various components such as a lens and an image sensor, which is not specifically limited.
- the memory may include random access memory (Random Access Memory, RAM), or non-volatile memory (Non-Volatile Memory, NVM), for example, at least one disk memory.
- RAM Random Access Memory
- NVM Non-Volatile Memory
- the memory may also be at least one storage device located away from the foregoing processor.
- the aforementioned processor may be a general-purpose processor, including a central processor (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; it may also be a digital signal processor (Digital Signal Processing, DSP), dedicated integration Circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
- a central processor Central Processing Unit, CPU
- NP Network Processor
- DSP Digital Signal Processing
- ASIC Application Specific Integrated Circuit
- FPGA Field-Programmable Gate Array
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Claims (11)
- 一种PT坐标与GPS坐标的转换方法,其特征在于,包括:获取球机拍摄监控目标时的PT坐标,作为第一P坐标和第一T坐标;基于所述第一P坐标,确定所述监控目标与指定方向的水平夹角;基于所述第一T坐标以及所述球机的高度,计算所述监控目标与所述球机的水平距离;根据所述水平夹角和所述水平距离,通过三角函数计算所述监控目标与所述球机的经线方向距离和纬线方向距离;基于所述球机的经纬度以及所述经线方向距离和纬线方向距离,计算所述监控目标的GPS坐标。
- 根据权利要求1所述的方法,其特征在于,所述获取球机拍摄监控目标时的PT坐标,作为第一P坐标和第一T坐标,包括:获取监控目标在球机拍摄图像中的图像坐标;根据所述图像坐标、以及所述球机拍摄所述监控目标时的视场角,确定所述球机正对所述监控目标时的PT坐标,作为第一P坐标和第一T坐标。
- 根据权利要求1所述的方法,其特征在于,所述基于所述第一P坐标,确定所述监控目标与指定方向的水平夹角,包括:通过所述球机的电子罗盘,获取球机指向指定方向时的球机P坐标,作为第二P坐标;计算所述第一P坐标与所述第二P坐标之差,作为所述监控目标与所述指定方向的水平夹角。
- 根据权利要求1所述的方法,其特征在于,所述基于所述第一T坐标以及所述球机的高度,计算所述监控目标与所述球机的水平距离,包括:计算所述第一T坐标的正切值与所述球机的高度的乘积,作为监控目标与所述球机的水平距离。
- 根据权利要求1所述的方法,其特征在于,所述指定方向为正北;所述根据所述水平夹角和所述水平距离,通过三角函数计算所述监控目标与所述球机的经线方向距离和纬线方向距离,包括:计算所述水平夹角的正弦值与所述水平距离的乘积,作为所述监控目标与所述球机的经线方向距离;计算所述水平夹角的余弦值与所述水平距离的乘积,作为所述监控目标与所述球机的纬线方向距离。
- 一种PT坐标与GPS坐标的转换方法,其特征在于,包括:根据监控目标的GPS坐标、以及拍摄所述监控目标的球机的GPS坐标,计算所述球机与所述监控目标的经线方向距离和纬线方向距离;根据所述经线方向距离和纬线方向距离,计算所述监控目标与所述球机的水平距离;根据所述经线方向距离和纬线方向距离,通过三角函数计算所述监控目标与指定方向的水平夹角;根据所述水平夹角,确定所述球机的P坐标;根据所述水平距离及所述球机的高度,计算所述球机的T坐标。
- 根据权利要求6所述的方法,其特征在于,所述指定方向为正北;所述根据所述经线方向距离和纬线方向距离,通过三角函数计算所述监控目标与指定方向的水平夹角,包括:计算所述经线方向距离与所述纬线方向距离的比值,作为所述水平夹角的正切值;通过所述水平夹角的正切值,求解所述水平夹角。
- 根据权利要求6所述的方法,其特征在于,所述根据所述水平距离及所述球机的高度,计算所述球机的T坐标,包括:计算所述水平距离与所述球机的高度的比值,作为所述球机的T坐标的正切值;通过所述球机的T坐标的正切值,求解所述球机的T坐标。
- 根据权利要求6所述的方法,其特征在于,所述方法还包括:若确定的所述球机的P坐标存在水平误差,则通过调节所述球机的电子罗盘,减少所述水平误差。
- 根据权利要求6所述的方法,其特征在于,所述方法还包括:若计算得到的所述球机的T坐标存在垂直误差,则通过调节所述球机的高度值,减少所述垂直误差。
- 一种球机,其特征在于,包括图像采集器、处理器和存储器;图像采集器,用于采集图像,并将所采集的图像作为待处理图像;存储器,用于存放计算机程序;处理器,用于执行存储器上所存放的程序时,实现权利要求1-5或者6-10任一所述的方法步骤。
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