mirror of
https://github.com/peterbraden/node-opencv.git
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59 lines
2.2 KiB
CoffeeScript
59 lines
2.2 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',1)
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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 from the video feed window.
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intervalId = setInterval(()->
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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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# We apply filters and effects to the frame we got from the
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# camera to manipulate the video that we'll display.
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# First we convert to grayscale.
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im.convertGrayscale()
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# We then apply GaussianBlur.
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# It takes an array of type double and size 2
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# that indicates how strong the gaussian blur should be.
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im.gaussianBlur([7,7])
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# We then apply canny edge filtering.
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# Params are lower and higher threshold and aperture size,
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# although nodejs-opencv overwrite the aperture size param
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# with 0. An update to consider it is needed.
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im.canny(0, 30, 3)
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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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console.log("KEYPRESSED => #{ res } ")
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# In this case I terminate the program if any key is pressed.
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if res >= 0 then clearInterval(intervalId)
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)
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, 50)
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