Image measuring device for analyzing landscape style and appearance composition of urban bridge

Abstract

The utility model relates to an image measuring device for analyzing urban bridge landscape styles and features, which comprises an unmanned aerial vehicle and at least two laser range finders, the unmanned aerial vehicle is provided with a signal lamp and a patch type photosensitive sensor, one laser range finder is placed on a bridge, the other laser range finders are placed on point locations on the bank of a river channel, and the signal lamp and the patch type photosensitive sensor are arranged on the unmanned aerial vehicle. The laser range finder located on the bridge is a first laser range finder, the laser range finder located on the bank point of the river channel is a second laser range finder, the first laser range finder emits laser in the length direction of the river channel, and the second laser range finder emits laser in the direction perpendicular to the length direction of the river channel; the unmanned aerial vehicle determines a shooting point position on the river channel by receiving laser emitted by the first laser range finder and the second laser range finder, and the unmanned aerial vehicle shoots a landscape style image of the bridge at the determined shooting point position. According to the utility model, the shooting point position on the river channel can be determined, and the image picture shooting of the bridge landscape style at the shooting point position can be automatically completed.

Description

Technical Field

[0001] This utility model relates to an apparatus for image measurement, specifically an image measurement apparatus for analyzing the landscape features of urban bridges. Background Technology

[0002] In the process of urban development and renewal, the protection of ancient bridges and the reconstruction of new bridges all require the assessment and analysis of the appearance of existing bridges. Because bridges are often located on water surfaces of varying sizes, it is inconvenient to use measuring tools such as tape measures and rangefinders to quantify their dimensions and the proportions of elements other than the bridge itself, such as vegetation, the water embankments on both sides, buildings, and even elements such as the water surface and the sky. Therefore, seeking a scientific method to quantify the composition of urban bridges and their surrounding environment is of great significance for fields such as investigation, research, assessment, planning and design, and engineering construction.

[0003] Taking a landscape image of a bridge as an example, by capturing images of the landscape at a fixed location on the bridge, the acquired images are then analyzed by breaking down and statistically analyzing different landscape elements (including sky, water, plants, bridge, buildings, road paving, etc.) (e.g., Figure 1 As shown in the figure, the proportion of different landscape elements in the image is calculated, and the proportion is compared with the evaluation scale formed by the expert evaluation method. Finally, a quantitative score is formed for the landscape appearance of the bridge. Based on the score results, the necessity of protecting the landscape appearance of the bridge is analyzed and judged. The above method can be used to provide a reference for the formulation of targeted and differentiated protection strategies for urban bridges.

[0004] When using the analysis method described above, in order to quantify the landscape composition of the bridge and its surrounding environment in the images and to improve the accuracy of the analysis results, it is usually necessary to select multiple fixed shooting points to acquire images of the bridge from different angles. Typically, bridges are built over waterways. When selecting fixed shooting points, it is generally necessary to include a side perspective view of the bridge taken from a point on the riverbank, as well as a front elevation view of the bridge taken from the center of the river. Shooting from riverbank points is relatively easy, but shooting from the center of the river is more difficult. Based on this purpose, this invention proposes an image measurement device for analyzing the landscape composition of urban bridges, which can easily acquire images of the bridge taken from different points. Utility Model Content

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] The utility model relates to an image measuring device for analyzing the landscape and style of city bridge, including unmanned aerial vehicle and at least two laser range finders, unmanned aerial vehicle is equipped with signal light and patch type photosensitive sensor, one laser range finder is placed on the bridge, the rest laser range finders are placed on the point position of river bank, the laser range finder on the bridge is first laser range finder, the laser range finder on the point position of river bank is second laser range finder, first laser range finder emits laser along the length direction of river, second laser range finder emits laser along the direction perpendicular to the length of river, unmanned aerial vehicle determines the shooting point position on the river by receiving the laser emitted by first laser range finder and second laser range finder, unmanned aerial vehicle flies to the shooting point position and shoots the landscape and style image of bridge.

[0007] Further, the first laser range finder and the second laser range finder are both installed on a tripod.

[0008] Further, the first laser range finder is placed at a center point CF of the bridge, and the point CF is located at 1 / 2 of the width W of the river at the position of the bridge, and the first laser range finder emits laser along the center line of the river.

[0009] Further, the shooting point positions are divided into shooting point positions on the river and shooting point positions on the bank, the shooting point positions on the river are multiple and are all located on the center line of the river.

[0010] Further, the shooting point positions on the river include a point J1, a point J2 and a point J3, and the shooting point positions on the bank include points F2, F3, F2', and F3', wherein the points F2 and F3 are located on the same side of the river bank, the points F2' and F3' are located on the other side of the river bank, the points F2', J2, and F2 are collinear and perpendicular to the center line of the river, the points F3', J3, and F3 are collinear and perpendicular to the center line of the river, and the second laser range finders are placed at the points F2 and F3, respectively.

[0011] Further, the distance from the point J1 to the point CF is (1 / 2)W, the distance from the point J2 to the point CF is W, and the distance from the point J3 to the point CF is 2W.

[0012] The image measuring device provided by the utility model can utilize the unmanned aerial vehicle to take image pictures of the bridge and the surrounding environment at the determined shooting point, and the unmanned aerial vehicle can easily complete automatic shooting of the image at the shooting point on the bank or on the river, the outer surface of the unmanned aerial vehicle is provided with a photosensitive sensor, the laser range finder placed at the determined position emits laser light in the determined direction, once the laser light irradiates on the photosensitive sensor, the photosensitive sensor converts the laser light energy into an electric signal to light up the signal lamp on the unmanned aerial vehicle, the position of the shooting point can be determined through the mode, and the distance parameter between the shooting point and the laser range finder can be measured through the laser reflected by the unmanned aerial vehicle, thereby facilitating statistical analysis of the model used for analyzing the image in the later period. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A schematic diagram for splitting different landscape elements of the image picture of the bridge landscape obtained through shooting at the determined position;

[0014] Figure 2 A component schematic diagram of the image measuring device in the embodiment;

[0015] Figure 3 A schematic diagram of the position of the photosensitive sensor on the unmanned aerial vehicle;

[0016] Figure 4 A schematic diagram of the working principle of the bridge landscape image shooting positioning;

[0017] Figure 5 A schematic diagram of the bridge landscape shooting plane in the specific example.

[0018] Reference signs:

[0019] 1, laser range finder;

[0020] 2, unmanned aerial vehicle; 21, patch photosensitive sensor; 22, signal lamp;

[0021] 3, tripod. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiment of the utility model will be clearly and completely described in combination with the drawings in the embodiment of the utility model.

[0023] The embodiment discloses an image measuring device for analyzing the constitution of the city bridge landscape, like Figure 2As shown, mainly consists of unmanned aerial vehicle 2, laser range finder 1 and tripod 3. Laser range finder 1 is fixedly installed on the top of tripod 3, and the height of laser range finder 1 placed at each position point can be satisfied by adjusting the height of tripod 3. The main function of unmanned aerial vehicle 2 is to take pictures of the bridge landscape, and in this embodiment, unmanned aerial vehicle 2 can also determine the accurate position of the preset fixed-point shooting point on the river through cooperation with laser range finder 1, and can complete the distance measurement from the fixed-point shooting point to the position of laser range finder 1. In order to achieve the above purpose, as shown in Figure 3 In this embodiment, a patch type photosensitive sensor 21 is laid on the outer surface of the unmanned aerial vehicle 2, and a signal lamp 22 is arranged. As shown in Figure 4 As shown, the laser range finder 1 emits laser light in a predetermined direction, and when the unmanned aerial vehicle 2 flies to the preset shooting point, the laser light is irradiated on the patch type photosensitive sensor 21 on the surface of the unmanned aerial vehicle 2. Since the patch type photosensitive sensor 21 is a surface-mounted photosensitive element mainly composed of an electrode, a semiconductor sensitive film and a packaging material, the change of light intensity can be detected, and the light energy of the laser light is converted into an electrical signal to light up the signal lamp 22 on the unmanned aerial vehicle 2, thereby indicating that the unmanned aerial vehicle 2 has reached the preset fixed-point shooting point. Moreover, the laser light emitted by the laser range finder 1 is blocked and reflected back by the body of the unmanned aerial vehicle 2, and the distance parameter between the laser range finder 1 and the current position of the unmanned aerial vehicle 2 can also be measured, which is convenient for the calculation model statistical analysis used when analyzing the pictures later.

[0024] For the selection of the position of the preset shooting point, generally, the shooting point located in the center of the river and the shooting point located on the bank are needed. The orthographic view of the bridge can be obtained from the shooting point located in the center of the river, and the side perspective view of the bridge can be obtained from the shooting point located on the bank. In order to achieve more accurate analysis results, generally, multiple fixed-point positions are arranged for each of the shooting point located in the center of the river and the shooting point located on the bank. In this embodiment, the specific example shown in Figure 5 As shown in the specific example, a total of seven shooting points are arranged, which are point J1, point J2 and point J3 located on the center line of the river, and point F2, F3, F2' and F3' located on the bank. Among them, F2 and F3 are located on the same side of the river bank, F2' and F3' are located on the other side of the river bank, point F2', J2, F2 are collinear and perpendicular to the center line of the river, and point F3', J3, F3 are collinear and perpendicular to the center line of the river.

[0025] The specific positions of the determined shooting points and the determination process of the positions are explained as follows in the embodiment: assuming that the width of the river is W, a bridge center point CF is first set on the bridge, the point CF is located at (1 / 2)W of the position of the bridge, and the first laser range finder is placed at the point CF together with the tripod 3; then a second laser range finder is placed on one side of the river, and the point of the second laser range finder is the F1 or F1' in the formula (1) at this time. Figure 5 The shooting points selected in the embodiment satisfy the following relationships: the distance between the point J1 and the point CF is (1 / 2)W, the distance between the point J2 and the point CF is W, and the distance between the point J3 and the point CF is 2W. Since the points J1, J2 and J3 are all located on the river, the positions cannot be directly positioned by measuring tools such as a tape measure, while the positions on the riverbank can be determined by measuring the distance from the bridge. In the embodiment, the position of the point J1 is first determined to determine the center line of the river, the first laser range finder at the point CF is controlled to emit laser light along the length direction of the river, the second laser range finder is placed at the point F1 on the riverbank at a distance of (1 / 2)W from the bridge, the second laser range finder is controlled to emit laser light along the direction perpendicular to the length of the river, and then the unmanned aerial vehicle 2 is controlled to fly to the vicinity of the point J1. Once the laser light emitted by the first laser range finder and the laser light emitted by the second laser range finder simultaneously irradiate the patch-type photosensitive sensor on the surface of the unmanned aerial vehicle 2, the signal lamp 22 is lit, and the operator can know that the unmanned aerial vehicle 2 has reached the accurate point J1. At this time, the unmanned aerial vehicle 2 is used to shoot the first elevation view of the bridge at the point J1, and the distance between the unmanned aerial vehicle 2 and the point CF is measured. By using the same principle, the second laser range finder can be placed at the point F2 and the point F3 respectively, so that the accurate positions of the point J2 and the point J3 can be obtained respectively, and the second and third elevation views of the bridge at the points J2 and J3 and the distance data from the points J2 and J3 to the point CF can be obtained respectively. The points F2 and F3 on the riverbank can be directly obtained by distance measurement. Since the points F2 and F3 are located on the riverbank, the unmanned aerial vehicle 2 can be controlled to fly to the points to shoot the perspective view of the side of the bridge and obtain the straight-line distance data from the shooting point to the bridge. The points F2' and F3' on the opposite bank of the river can be successfully found by using the emission linkage of the laser range finder 1 and the unmanned aerial vehicle 2, and then the unmanned aerial vehicle 2 is used to complete the shooting at the positions of the points F2' and F3'.

[0026] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An image measurement device for analyzing the landscape composition of urban bridges, characterized in that: The unmanned aerial vehicle and at least two laser range finders are provided with a signal lamp and a patch type photosensitive sensor, one laser range finder is placed on the bridge, and the rest of the laser range finders are placed on the point positions on the river bank, the laser range finder on the bridge is the first laser range finder, the laser range finders on the river bank are the second laser range finders, the first laser range finder emits laser along the length direction of the river, the second laser range finder emits laser along the direction perpendicular to the length direction of the river, the unmanned aerial vehicle determines the shooting point position on the river by receiving the laser emitted by the first laser range finder and the second laser range finder, and the unmanned aerial vehicle flies to the shooting point position to shoot the landscape image of the bridge.

2. The image measurement device for analyzing the landscape and appearance of urban bridges according to claim 1, characterized in that: The first laser range finder and the second laser range finder are both installed on tripods.

3. The image measurement device for analyzing the city bridge landscape view composition according to claim 1, characterized in that: The first laser range finder is placed at the center point CF of the bridge, the point CF is located at 1 / 2 width of the river width W at the position of the bridge, and the first laser range finder emits laser along the center line of the river.

4. The image measurement device for analyzing the landscape and appearance of urban bridges according to claim 3, characterized in that: The shooting point positions are divided into shooting point positions on the river and shooting point positions on the bank, the shooting point positions on the river are multiple and are all located on the center line of the river.

5. The image measurement device for analyzing the city bridge landscape view composition according to claim 4, characterized in that: The shooting point positions on the river include point J1, point J2 and point J3, and the shooting point positions on the bank include point F2, F3, F2' and F3', wherein F2 and F3 are located on the same side of the river bank, F2' and F3' are located on the other side of the river bank, point F2', J2, F2 are collinear and perpendicular to the center line of the river, point F3', J3, F3 are collinear and perpendicular to the center line of the river, and the second laser range finders are placed at point F2 and point F3.

6. The image measurement device for analyzing the city bridge landscape view composition according to claim 5, characterized in that: The distance from point J1 to point CF is (1 / 2,) W, the distance from point J2 to point CF is W, and the distance from point J3 to point CF is 2W.

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