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Depthcloud encoder that enables ros3d.js-based point cloud streaming

About

This package subscribes to the depth and rgb image of the openni_camera node and generates a single image stream that can be used to generate 3D point clouds in the web browser.

Published Topics

depthcloud_encoded (sensor_msg/Image)

Parameters

~depth (string, default: /camera/depth/image) ~rgb (string, default: /camera/rgb/image)

Usage

The depthcloud encoded images can be streamed to a web browser with the help of the ros_web_video package. In order to increase the dynamic range of the streamed depth image, it is split into two individual frames that encode the captured depth information from 0 to 3 meters and from 3 to 6 meters, respectively. Furthermore, compression artifacts are reduced by filling areas of unknown depth information with interpolated sample data. A binary mask is used to detect and omit these samples during decoding. Once this video stream is received by the web browser, it is assigned to a WebGL texture object which allows for fast rendering of the point cloud on the GPU. Here, a vertex shader is used to reassemble the depth and color data followed by generating a colored point cloud. In addition, a filter based on local depth variance is used to further reduce the impact of video compression distortion.

Source Code

Source code is available at https://github.com/RobotWebTools/depthcloud_encoder.

Support

Please send bug reports to the GitHub Issue Tracker. Feel free to contact us at any point with questions and comments.


2019-07-13 12:36