ofxDeinterlace is simple line averaging deinterlacer for openFrameworks.
wikipedia : Interlaced video
This addon use GLSL for deinterlace process. GLSL code refer the discussion topics below.
You just send video texture reference to the addon in setup() function.
video.loadMovie("1080i.mov");
video.play();
deinterlace = new ofxDeinterlace(video.getTextureReference());
to draw interlaced texture just call draw() method of addon.
deinterlace->draw();
ofxDeinterlace is distributed under the MIT License.