| Portability | tested on GHC only |
|---|---|
| Stability | experimental |
| Maintainer | Noam Lewis <jones.noamle@gmail.com> |
AI.CV.ImageProcessors
Description
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.
Simple example:
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 Image
- type ImageSource = IOSource () Image
- type ImageProcessor = IOProcessor Image Image
- type Image = PImage
- camera :: Int -> ImageSource
- videoFile :: String -> ImageSource
- window :: Int -> ImageSink
- resize :: Int -> Int -> InterpolationMethod -> ImageProcessor
- dilate :: Int -> ImageProcessor
- canny :: Int -> Int -> Int -> ImageProcessor
- haarDetect :: String -> Double -> Int -> HaarDetectFlag -> CvSize -> IOProcessor Image [CvRect]
- drawRects :: IOProcessor (Image, [CvRect]) Image
- runTill :: IOProcessor () b -> (b -> IO Bool) -> IO b
- runTillKeyPressed :: Show a => IOProcessor () a -> IO ()
- keyPressed :: Show a => a -> IO Bool
Documentation
type ImageSource = IOSource () ImageSource
camera :: Int -> ImageSourceSource
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.
videoFile :: String -> ImageSourceSource
window :: Int -> ImageSinkSource
A window that displays images. Note: windows with the same index will be the same window....is this ok?
resize :: Int -> Int -> InterpolationMethod -> ImageProcessorSource
OpenCV's cvResize
dilate :: Int -> ImageProcessorSource
OpenCV's cvDilate
Arguments
| :: Int | Threshold 1 |
| -> Int | Threshold 2 |
| -> Int | Size |
| -> ImageProcessor |
OpenCV's cvCanny
Arguments
| :: String | Cascade filename (OpenCV comes with several, including ones for face detection) |
| -> Double | scale factor |
| -> Int | min neighbors |
| -> HaarDetectFlag | flags |
| -> CvSize | min size |
| -> IOProcessor Image [CvRect] |
Wrapper for OpenCV's cvHaarDetectObjects and the surrounding required things (mem storage, cascade loading, etc).
drawRects :: IOProcessor (Image, [CvRect]) ImageSource
OpenCV's cvRectangle, currently without width, color or line type control
runTill :: IOProcessor () b -> (b -> IO Bool) -> IO bSource
Runs the processor until a predicate is true, for predicates, and processors that take () as input (such as chains that start with a camera).
runTillKeyPressed :: Show a => IOProcessor () a -> IO ()Source
Name (and type) says it all.
keyPressed :: Show a => a -> IO BoolSource
Some general utility functions for use with Processors and OpenCV
Predicate for pressed keys