I'm not sure what the terms are, but are the HD videos recorded from the Canon cameras capable of HD video (ie 720p or 1080p for 5DmkII, 7D, 1DmkIV, T1i):
* down-sampled from a high res frame (ie uses all the pixels and 'resizes' each frame) - kinf average a block of pixels.
* pixel dumping, and just taking the reading from a single pixel at the appropriate location on the sensor.
Do we know this information? Is it the same for all EOS HD, or are each camera different?