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https://github.com/peterbraden/node-opencv.git
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57 lines
2.1 KiB
CoffeeScript
57 lines
2.1 KiB
CoffeeScript
cv = require 'opencv'
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# First we create a new VideoCapture object to get
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# video from the camera (0 for default camera)
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camera = new cv.VideoCapture(1)
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# we create a window to display the Video frames
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namedWindow = new cv.NamedWindow('Video', 0)
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color = [255,0,0]
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frameRead = () ->
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# camera.read allows us to retrieve the current
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# frame to be displayed in the video window.
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camera.read((err, im) ->
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# We can check for errors and even break the
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# program execution if an error is detected here.
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console.log "The err ==>#{ err }" if err
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# There is no need to display the image width or Height
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# but I leave this here in case anyone needs to check them.
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#console.log("Width: #{im.width()}")
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#console.log("height: #{im.height()}")
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# Before working with the frame we need to check the image
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# is already available and has a width and height greater than 0,
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# otherwise it will fail when trying to do namedWindow.show()
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# and the image has width or height equal or less than 0.
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if im.width() > 0 and im.height() > 0
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#console.log("Interval ID => #{ intervalId }")
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#console.log(intervalId)
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clearInterval(intervalId) if intervalId?
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im.detectObject('./haarcascades/haarcascade_frontalface_alt.xml', {}, (err, faces) ->
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for face in faces
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im.rectangle([face.x, face.y], [face.x + face.width, face.y + face.height], [0,255,0], 2)
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# We use the previously created namedWindow to display the
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# video frame to wich we applied the blur and filter.
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namedWindow.show(im)
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# Finally we get the key pressed on the window to terminate
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# execution of the program.
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res = namedWindow.blockingWaitKey(0, 20)
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# In this case we terminate the program if any key is pressed.
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#if res >= 0 then do not set a new timeout to get a new frame.
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setTimeout(frameRead, 5) if res < 0
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)
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)
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# We set an interval to retrieve frames from the
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# video source and we get the intervalId so we can
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# stop the program by pressing any key on the video feed window.
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intervalId = setInterval(() ->
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frameRead(intervalId)
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, 100)
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