cv_bridge accuracy?

Question

ROS passes around images in its own sensor_msgs/image message format. But it is 8bit data. So I wiil want to use images in conhunction with OpenCV. CvBridge is a ROS library that provides an interface between ROS and OpenCV. Maybe Using cv_bridge is 32bit data. Dose from 8bit to 32bit make loss accuracy?

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Originally posted by ha on ROS Answers with karma: 1 on 2012-08-30

Post score: 0

Answer 1

ROS Image messages are not necessarily 8-bit data; the Image message supports a variety of encodings. (Note that the message uses an array of 8-bit values to store a binary blob; that doesn't mean it's 8-bit data.)

Unless you specifically tell it not to, cv_bridge will respect the type of the Image message it's operating on, and the resulting cv::Mat will match.

See the documentation on image_transport and cv_bridge for more.

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Originally posted by Mac with karma: 4119 on 2012-09-02

This answer was ACCEPTED on the original site

Post score: 4

Answer 2

Take a look here at the cv_bridge tutorials and there are examples of what @Mac said.

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Originally posted by Kevin with karma: 2962 on 2012-09-02

This answer was NOT ACCEPTED on the original site

Post score: 1