analyze_mjpeg

A simple app that connects to a MJPEG web camera, performs some filtering on the video and displays the filtered video.

The app mainly shows how to:

• Read and process a MJPEG stream using C++ and Boost.
• Use Boost::ASIO to read an MJPEG stream.
• Parse the MJPEG stream (multipart MIME).
• Uncompress JPEGs in memory with IJG libjpeg.
• Perform some filtering on the stream.
• Display the filtered stream with SDL.

There is minimal error checking and no attempt to recover from glitches in the stream.

Filters

There are two filters implemented:

FilterAverage: Displays the average of each pixel.

FilterNightVision: Calculates the inter-frame and intra-frame average of each pixel. Uses the intra-frame average to determine the black level for each frame. The black level is then used as a basis for amplifying each color channel to cover the entire color range. The inter-frame average is then updated and displayed.

Technologies

• C++
• Boost::ASIO
• SDL (Simple DirectMedia Layer)
• IJG libjpeg

Platform

Project files for Visual Studio 2010 and binary for 64-bit Windows are included. The project is untested on other platforms, but is intended to be cross-platform.