Ichthyostega
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Some sections of the Lumiera website document meeting minutes, discussion protocols and design proposals from the early days of the project; these pages were initially authored in the »Moin Moin Wiki« operated by Cehteh on pipapo.org at that time; this wiki backed the first publications of the »Cinelerra-3« initiative, which turned into the Lumiera project eventually. Some years later, those pages were transliterated into Asciidoc semi-automatically, resulting in a lot of broken markup and links. This is a long standing maintenance problem problem plaguing the Lumiera website, since those breakages cause a lot of warnings and flood the logs of any linkchecker run.
68 lines
2.2 KiB
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68 lines
2.2 KiB
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|====================================
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|*State* | _Parked_
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|*Date* | _2007-06-07_
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|*Proposed by* | ct
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|====================================
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Render Optimizer
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----------------
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Render only parts of a frame which are necessary for the Output;
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optimize render pipeline for efficiency
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Description
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~~~~~~~~~~~
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This Idea is just stored here for later reference/implementation.
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Effects give some information on which data their output depends (like
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transitions, temporal dependencies, color/alpha etc) and what the operation
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costs. Based on this information we optimize the render pipeline, for example
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if the output is a zoom, then we only need to calculate the parts of a frame
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which will be viewable in the output (plus some more dependencies, like blur
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has radius and so on). Further in some cases it might be favorable to reorder
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some effects for the actual render process, as long it would produce the same
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output as the original sequence of effects.
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Comments
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--------
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Possible classification for video filters:
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1. The filter only changes the color of each pixel in the same way
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2. The filter deforms the image but leaves the color
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3. The filter makes complex things. The only additional hint it can export is
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the number of referenced past frames, if such a limit exists (sometimes it
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doesn't).
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Filters of type 1 and type 2 never use any previous frames, and are strictly
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one frame in -- one frame out. Filters of type 1 can always be swapped with
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filters of type 2, the output is the same. All other filters cannot be swapped
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in general.
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The good news is, that:
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1. All commonly used filters are either type 1 or type 2
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(type 3 are more the fun effects)
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2. Filters of type 2 are colormodel agnostic
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3. If a filter of type 1 makes only linear transformations of the color vectors +
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(i.e.: new_color ≔ matrix · old_color),
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then the matrix can be transformed from e.g. RGB to YUV, so these filters can
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always work in both colorspaces directly
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Parked
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~~~~~~
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Generally this is accepted but needs some more polishing when we go over it.
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Christian Thaeter:: 'Thu 14 Apr 2011 03:06:42 CEST'
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''''
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Back to link:/x/DesignProcess.html[Lumiera Design Process overview]
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