X-don
Imported Account
May 11, 2001, 8:04 AM
Post #3 of 3
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Re: GL1-- progressive vs. Frame mode
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: hey, im wondering if anyone can tell me: is progressive and "Frame" mode the same thing? or totally different.
Similar but not the same.
All NTSC video frames are composed of 2 alternating interlaced fields (even and odd lines). The question is how the two fields are captured. The options are as interlaced fields separated in time by about 1/60 sec; as a single frame at captured at one instant (progressive scan) that is then split into two interlaced fields for recording/transmission/viewing, or as Canon's frame mode, which approximates progressive scan mode.
Frame mode reads the green pixels from the even lines and the red/blue pixles from the odd lines at the same instant and does some DSP to construct what amounts to a full frame as if it were progressively scanned. It is analogous to the pixel shift used to improve horizontal resolution. This full frame is then recorder and transmitted as two interlaced fields per NTSC specification.
The result is not as high resolution as a true progressive scan, but significantly better than the simple field doubling or interpolation used by most other camcorders.
Progressive scan and frame mode eliminates the inter-field motion artifacts in an image, and result in a more film-like look. It also can result in a sort of strobbed look to video if there is panning or fast motion..
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