|Portability||tested on GHC only|
|Maintainer||Noam Lewis <firstname.lastname@example.org>|
ImageProcessors is a functional (Processor-based) interface to computer vision using OpenCV.
The Processor interface allows the primitives in this library to take care of all the allocation / deallocation of resources and other setup/teardown requirements, and to appropriately nest them when combining primitives.
win = window 0 -- The number is essentially a label for the window cam = camera 0 -- Autodetect camera edge = canny 30 190 3 -- Edge detecting processor using canny operator test = cam >>> edge >>> win
The last expression is a processor that captures frames from camera and displays edge-detected version in the window.
- type ImageSink = IOSink (Ptr IplImage)
- type ImageSource = IOSource () (Ptr IplImage)
- type ImageProcessor = IOProcessor (Ptr IplImage) (Ptr IplImage)
- keyPressed :: Show a => a -> IO Bool
- runTill :: IOProcessor () b -> (b -> IO Bool) -> IO b
- runTillKeyPressed :: Show a => IOProcessor () a -> IO ()
- capture :: IO (Ptr CvCapture) -> ImageSource
- camera :: Int -> ImageSource
- videoFile :: String -> ImageSource
- window :: Int -> ImageSink
- imageProcessor :: (Ptr IplImage -> Ptr IplImage -> IO (Ptr IplImage)) -> (Ptr IplImage -> IO (Ptr IplImage)) -> ImageProcessor
- resize :: Int -> Int -> InterpolationMethod -> ImageProcessor
- dilate :: Int -> ImageProcessor
- canny :: Int -> Int -> Int -> ImageProcessor
- haarDetect :: String -> Double -> Int -> HaarDetectFlag -> CvSize -> IOProcessor (Ptr IplImage) [CvRect]
- drawRects :: IOProcessor (Ptr IplImage, [CvRect]) (Ptr IplImage)
Some general utility functions for use with Processors and OpenCV
Predicate for pressed keys
Runs the processor until a predicate is true, for predicates, and processors that take () as input (such as chains that start with a camera).
A capture device, using OpenCV's HighGui lib's cvCreateCameraCapture should work with most webcames. See OpenCV's docs for information. This processor outputs the latest image from the camera at each invocation.
A window that displays images. Note: windows with the same index will be the same window....is this ok?
A convenience function for constructing a common type of processors that work exclusively on images
Cascade filename (OpenCV comes with several, including ones for face detection)
|-> IOProcessor (Ptr IplImage) [CvRect]|
Wrapper for OpenCV's cvHaarDetectObjects and the surrounding required things (mem storage, cascade loading, etc).