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Do you think we are missing an alternative of cvcombinators or a related project?
README
Functional Combinators for Computer Vision
This library is intended to wrap CV primitives in a pure functional API. Currently the idea is to use HOpenCV (OpenCV bindings for Haskell) as the backend.
Processor Module  Semantic Design
The Processor type is parameterized over monads, and does not have a semantic model (currently). The model is given for IOProcessor, which is essentially a Processor on the IO monad.
The meaning of an IOProcessor, if the value is instantiated according to the rules, is given by:
[[ IOProcessor a b ]] = a > b
Semantic typeclass instances: All the instance functions are Type Class Morphisms  just replace the processor with the function, and use the appropriate function instance.
[[ Category IOProcessor ]] = Category [[ IOProcessor ]] = Category (a > b)
[[ p1 . p2 ]] = [[ p1 ]] . [[ p2 ]]
[[ id ]] = id
[[ Functor (IOProcessor a) ]] = Functor [[ IOProcessor a ]] = ...
[[ fmap f p ]] = fmap f [[ p ]]
= f . [[ p ]]
[[ Applicative (IOProcessor a) ]] = Applicative [[ IOProcessor a ]] = ...
[[ pure ]] = pure
= const
Arrow: etc...
Laws that IOProcessor a b must satisfy
TODO (ptrs, etc.)
ImageProcessor  Examples
camera :: Processor () (Ptr CxCore.IplImage)
resizer :: Processor (Ptr CxCore.IplImage) (Ptr CxCore.IplImage)
test1 :: Processor () (Ptr CxCore.IplImage)
test1 = resizer . camera
TODO:
Hide all impure stuff from the ImageProcessor API, by not exporting it.
Copying images, such as for the drawRects processor, is redundant in many cases because the input image is an allocated output image of the previous processor, and if nobody else uses this as input there's no reason to not draw "on the image" itself, no need to copy. How to avoid this? Special processor? what?
forkJoin:
 can this be implemented using parallel (or any other primtives?)
Allow viewing the processor graph (See deep vs. shallow below)
Use MaybeT and processors that output Maybes to implement a "FRP" (?) framework:
 continuously rerun the processing loop, which will terminate an iteration whenever one process returns Nothing
 somehow run each processor only once, even if graph was split (and even rejoined)
Embed image depth/nchannels in the types? If not, we can't assure safety at all when building OpenCV processor chains, because some functions require certain formats (such as cvCanny requiring grayscale)
Consider the cost of eliminating the special output type for the process function:
 we went from a > x > m o , to: a > x > m x
 the cost is that you can't runWith a function that uses the process' result, because it doesn't know
 the output type.
Consider what happens with recursion in the host language (in terms of interpretation by a deepdsl):
 blah = toBlahType (Processor blah ... )
deep vs. shallow dsl:
 deep:
 optimization (in deep seems easier?)  not running same processor twice if possible
 knowing which new outputs are interesting in a join (>)  if a parallelized side returns Nothing
 shallow: eliminates intepretations in recursions?
 possibilities:
 use shallow combinators, plus save "deep" stuff about the structure that was combined to be used for optimization etc. during 'running' of the structure
 add something like 'let x = ...' to the DSL itself, so that i can later tell that a value is shared.
DEBUG: if we add prints in keyPressed, detector and drawRects, we get results like the following, which don't make much sense  looks like the drawing processor gets its input with "lag" w.r.t detector.
Example:
()
"detected rects"
[CvRect {rectX = 153, rectY = 118, rectWidth = 157, rectHeight = 157}]
"drawing rects:"
[CvRect {rectX = 161, rectY = 128, rectWidth = 142, rectHeight = 142},CvRect {rectX = 24, rectY = 262, rectWidth = 24, rectHeight = 24}]
()
"detected rects"
[CvRect {rectX = 156, rectY = 122, rectWidth = 153, rectHeight = 153},CvRect {rectX = 8, rectY = 102, rectWidth = 39, rectHeight = 39}]
"drawing rects:"
[CvRect {rectX = 153, rectY = 118, rectWidth = 157, rectHeight = 157}]
()
 Consider using rewrite ruels to share allocations?