Zerene stacker vs. helicon focus1/5/2024 ![]() Often the depth map is smoothed as a final step.Ī third class are the "contrast weighted" methods. All of these processes result in a depth map that has holes, and then the holes are filled in by some interpolation method. Other packages use other methods, typically examining the distribution of values in small neighborhoods of the depth map, and marking as not-to-be-trusted any places where too many different depth values are found. ![]() In Zerene Stacker, that's the function of the contrast threshold slider, to take advantage of human understanding to tell the software where depth from image content did the right thing. Another common problem is that many scenes contain areas where there is little or no focused detail, so some method is required to keep the depth map in those areas from being determined by random noise rather than meaningful image content. 42#p135042 and discussed in the surrounding thread. This introduces an unavoidable "halo" problem, as illustrated at. The difficulty is that many subjects do not match the depth map concept, for example having parts that overlap. Where the physical structure of the subject matches the depth map concept, these methods work great. The initial estimates of best focus can be done using one of the kernel-based methods described in. The key idea in depth mapping is to assume that the stack frames are in depth order, figure out which frame has the best focus in each small neighborhood, then construct a single-valued depth map function that fits the best-focus estimates, and finally construct the output image by selecting pixel values from just a single frame, or a weighted average of two adjacent frames, as specified by the depth map. I do not have a handy reference for depth map methods, but I expect articles are pretty simple to find. Zerene Stacker DMap and Helicon Focus Method B are both "depth map" methods. exploits the fact that the Laplacian pyramid representation already directly encodes local contrast of details at each scale level, to create a particularly simple method for the focus stacking bit. The most important concept of the pyramid methods is that you decompose each image into a bunch of different scales of detail (levels of the pyramid), you do some form of focus stacking on each layer independently, then you construct the output image as the recomposition of all the focus-stacked levels of the pyramid. This is not exactly what PMax does, and I doubt that it is exactly what HFMC does, but it should be close enough to get you started. In that paper, look in particular at formula 7 and figure 9 (in which it looks like panels a and c got accidentally switched). Processing, "Pyramid Methods in Image Processing", Adelson et.al., 1983. I can provide partial answers to your questions.Ī good introduction to the "pyramid" methods that are used by Zerene Stacker PMax and (I presume) by Helicon Focus Method C is provided by. Thanks a lot, and sorry if there are already answers to these subject in some place/thread, but i can't find specifically. In some other forums, someone claims that Photoshop procedure is something that "resembles" the formally named "Method A" of Helicon.Ī) Is there someone can confirm this info ? Or is a totally different logic? (maybe also someonce can infer/induct conclusions from his experience?)ī) Is there someone can address me about the photoshop method (in general i mean) and the differences between Zerene and Helicon ?Ĭ) Are there some docs/papers which i'm missed (i mean also for Zerene /Helicon procedure which i can read to go more depth) ? Instead, I can't find anything about Photoshop logic/procedure, or at least i'cant find anything with some "good level of trustness". ![]() Thanks to documentation of Zerene and also Helicon, i've at least a little idea of which kind of algo's and logic they use (sure, i know details are not public due to commercial reasons) I'm here for the expertise that various member clearly shows, as also for Rik (his knowlegde is quite vaste of course). Hi, i'm a student interested in stacking procedure.Įven if newbie in the field, after a little search seems already clear that the big actors in this field are Zerene/Helicon.
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