Mapillary’s computer vision technology automatically detects objects depicted in images, such as buildings, cars, pedestrians, bicycle racks, and much more. This is based on a method called semantic segmentation—an algorithm is trained to detect and assign a category label to every pixel in the image.
Since each image has geocoordinates, it is possible to also visualize the object detections on the map. This will let you filter for images that contain specific kinds of objects. The map visualizations at this stage reflect positions of the images where certain objects are visible. This is not the same as map features, which is one step further—triangulating the location of an object that has been detected in several images, so we can determine the location of that object in the real world and place it on the map as a map feature.
You can visualize object detections on the Mapillary web app. (See the article about exploring object detections.)
To retrieve and use automatically extracted object detections, create a Mapillary account and set up an organization to get started.
Below is the list of the 65 classes of objects that are provided in the data license.
|Lane marking (dashed)
Lane marking (solid)
Lane marking (other)
Lane marking (stop line)
Lane marking (text)
What is the principle of triangulating the location of detected objects in several images and retrieving the real world location of objects?
Hi! Wikipedia has a great article on triangulation: https://en.wikipedia.org/wiki/Triangulation_(computer_vision)
This is the principle we use as well when triangulating object detections, in order to generate map features that represent the objects' real-world locations.
Trees are listed but do not show up. Vegetation in general is not listed. Need for analysis of greencity environment.
Hi! "Trees" are actually "vegetation" and we've apparently forgotten to update the documentation here. Fixed now and thank you for pointing this out.
Hi! Unless I am missing something, I can not find "Wire group" category label in "mapillary-vistas-dataset_public_v2.0.zip" dataset. Am I missing something? Thanks in advance!
Hello, it seems that we can't see anymore the semantic segmentation in the web app, I think you should update this article
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