MobilTech (Seoul, KR)

Method of collecting information about road signs using the mobile mapping system which can collect information on the markings on the road in real time and convert the information onto an extremely high-definition map using the mobile mapping system comprising a remote sensing device as well as a navigation device, is described. In particular, the system is able to capture accurate road marking information in real-time by separating objects and attributes from multiple images based on deep learning and map the road marking information to a high-definition map, and remarkably improve accuracy of recognizing the road marking information. Therefore, performance and reliability could be improved in the field of autonomous driving and the field of road recognition and the high definition road map field for autonomous driving, and the fields similar or related thereto.

Field of the Invention

The invention is a method for gathering information on road signs using an app for mapping on smartphones. In particular, it is a method for collecting information on road signs using a smartphone mapping system. This system can collect information on road markings in real time, then map them onto a high-definition map, and use a combination of remote sensing devices and a navigation device using a handheld mapping system.

The present invention is particularly pertinent to a method of gathering information on road signs with mobile mapping systems. This is done by extracting objects from successive images on the basis deep learning. It can also map the road markings information onto high definition maps, and greatly increase the accuracy in recognising the road markings information.

Background of Related Art

Unmanned autonomy of vehicles (autonomous vehicle) generally consists of planning a driving route in accordance with the surroundings and understanding the environment.

High definition maps (HD-maps) are three-dimensional maps that include information on the surroundings like roads, terrain elevations and curvatures. The HD-map also contains the information needed to drive on roads.

For instance, the HD-map includes various information needed for driving on the road in question, such as lanes, driving directions intersections, traffic signals, traffic lights speed limits, and other pertinent information for the road.

A vehicle that is autonomous can drive on the road and recognize surrounding environments based on the HD-map. This technique is called Road Information Detect Method for Auto-Driving Robot’ autonomous driving robotic using TheSame that is described in Korean Patent Registration Number. This is a prior art document that is described below.

As described previously, it is claimed that the HD-map is crucial in the field of autonomous driving, and also requires most correct and rapid update to ensure safe autonomous driving.

The HD-map is generally created through four steps: planning work, data acquisition , and point cloud data generation. Editing and drawing objects are also included.

Within the four stages in the process, the one of data acquisition gathers information about the road mostly by using a driving device (vehicle or something similar) equipped with LiDAR or similar as well as three-dimensional point cloud information of the road can be generated by the data gathered.

Because the three-dimensional point cloud data is only a snapshot about the roads’ shapes and shapes, it is essential to include information that can be accessed by a driver traveling on the road. This is information such as roads’ markings on the surface, traffic signs and traffic lights.

However, since the majority of this information is manually mapped to a HD-map, there is a problem in that time and cost are required to create the HD-map.

(Patent Document 1) Korean Patent Registration No. 10-1348941 “Road information detection method for auto-driving robotic robot as well as auto-driving bot utilizing The Same”

Therefore, the present invention has been made to address the above problems, and it is an object of this invention to provide a method of collecting road sign information using a mobile mapping system, which can collect information onthe markings on the road in real time and convert the information into a high-definition map employing a mobile mapping system comprising a remote sensing device and the navigation device.

A further object of this invention is the creation of a method for collecting road markings information through mobile mapping systems. This can be done by separating objects from successive images using deep learning. This will and mapping the road markings to high-definition maps and increase the accuracy in recognizing road markings.

Furthermore, one of the objectives of the present invention is the provision of collecting road sign information through a mobile mapping device that can dramatically improve recall and precision (accuracy) in recognising an object as well as attribute information through a process of cleansing a result of recognizing the object as one result.

To accomplish the above-mentioned objectives an approach to collecting road sign information using a mobile mapping system according to the embodiment of the invention includes the following: a collection step that collects road data comprising point cloud data and image data by using the mobile mapping system and an object recognition process of detecting a bounding area for each object that is included in the successive image data and then confirming the object’s characteristics of the object; and an object mappingstep of calculating the spatial coordinates of a similar object in a high-definition map from the point cloud data.

The object recognition step can include an affirmation step for boundingbox data, which confirms information about bounding boxes that include location coordinates for each image as well as object attribute information for a corresponding boundingbox and a collection process for boundingbox informationthat tracks the coordinates of the location for each boundingbox and collects details about the boundingbox of each image; and an object attribute determination that selects the object with the highest number of boundingboxes among objects that share the same attribute information in all boundingboxes tracked as the object of the object the object the object of the object the object the object the object of the object the object the object, or as the object of the object of the object of object of object of object of the object of object of object of the object

In addition, at the bounding box information verification stage, information regarding the bounding boxes that are sequentially collected for each image may be saved on two-dimensional vector.

Additionally, during the bounding-box information gathering step, the steps of confirming the location coordinates for the same binding box from the current data, and then verifying a box in close proximity to the same coordinates in the next image can be performed in a sequence. This lets you follow the bounding boxes that are adjacent to the respective bounding boxes for every image.

Furthermore, at the bounding box information collection step, there will be one bounding area in the following image data that is within the distance of a tracking setting from an identical location in the present image data based off of the locationcoordinates for the bounding box that is corresponding, the corresponding bounding box can be chosen.

Furthermore, during the bounding box information collection step, there must be at minimum two bounding boxes within the following image data that are within a tracking setting distance from an equivalent position in the current image data on the basis of the location coordinates of the bounding box, the closest bounding box could be chosen.

In addition, at the information collection for bounding boxes step, if there is no bounding box to exist in the subsequent image data within the distance of a tracking setting from the same location in the current image data using the locationcoordinates of the corresponding bounding box, the tracking of the corresponding bounding box may be put on hold.

Furthermore, during the information collection for bounding boxes step, if there is a predetermined number of image data are not have a bounding boxes in the following image data that is within a tracking setting distance from the current image data based off of the location coordinates of the corresponding bounding box is accumulated, the tracking of the appropriate bounding box could be stopped.

In addition, the object mapping step may include: a point cloud data extraction step of extracting point cloud data in an inner area of a bounding box of each object from the point cloud data; a coordinate system conversion step of convertingthree-dimensional coordinates of the point cloud data into a map coordinate system of a high definition map; and an object coordinate calculation step of calculating coordinates of an object included in the corresponding bounding box from the convertedmap coordinates.

The median value of the converted points from the point cloud data could be calculated in the point of calculation for object coordinates. The median value could then be used to calculate the coordinates for each object that is within the bounding boxes.

Click here to view the patent on USPTO website.

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