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Magic Lantern FAQ[edit | edit source]
According to Six Ways at cinema5d.com forums, the zoom and focus peaking focus assist features "work with or without a chipped adapter," as " Neither of these depend on the lens or the camera AF-confirm." This is significant, as it allows the use of manual lenses such as Nikon or Olympus, to be used with a focus assist feature typically found only on expensive monitors.
Zoom during Recording[edit | edit source]
AJ posted some very impressive demos which enable zoom during recording: http://www.youtube.com/watch?v=-nW25AtYjAk
Focus peaking[edit | edit source]
There are VRAM segments with 720p YUV data when idle, which increase to 1080p when recording. AJ found a bunch of them: ASM Zedbra.
5D2 has edge detection implemented, but it seems it's too slow for real use. Users say it's not very good . Anyone has a link with screenshots or discussion about this?
A tentative of estimating the "amount" of focus is here: .
There is an implementation of edge detection in C which claims to be very fast  (didn't test it).
Focus with Image Morphology[edit | edit source]
In simple words:
- Dilate: expands white (light) areas of image
- Erode: expands the black (dark) areas
Basic idea: focused areas have details which are lost by open/close operation. Out of focus areas don't have those details.
Thresholding edge image[edit | edit source]
- fixed: you risk to display either a big, red mess in a sharp scene, or nothing at all if you have a softer lens.
- adaptive: what about percentile? e.g. display the sharpest 1% pixels
Experiment: is morphological method more accurate than edge detection? if yes, is it worth optimizing it?[edit | edit source]
- Method 1: simple edge detection, based on horizontal and vertical differences between adjacent pixels:
# octave3.2, y is YUV luma dyh = y(1:end-1,1:end-1) - y(1:end-1,2:end); dyv = y(1:end-1,1:end-1) - y(2:end,1:end-1); e = abs(dyv)+abs(dyh);
- Method 2: diff between original frame and morpho-closed one.
- Method 3: diff between original frame and morpho-opened one.
- Method 4: add images from 2 and 3.