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cv = require('opencv')
cv.readImage("./images/windows-logo.png", (err, im) ->
# The nodejs-opencv has some shortcodes for image manipulation.
# We modify the image using the handy function im.convertGrayscale()
# This will overwrite the current image with a grayscaled version.
im.convertGrayscale()
# Create new NamedWindow object to hold the image
# NamedWindow takes two arguments String WindowName and String windowSize
namedWindow = new cv.NamedWindow('Display Window', '400x400')
# We then tell the image to show the image we loaded.
namedWindow.show(im)
console.log("Image should be displayed inside a window.")
# Finally we tell the NamedWindow to wait for any key being pressed to close
# itself (by passing a 0 as the first param, or wait a defined amount of time
# by passing the time as a second argument (in milliseconds)
#
# If we do not tell the window to wait it will just load and show the image
# and close so fast that it will appear nothing happened.
namedWindow.blockingWaitKey(0, 5000)
console.log("And the window should close automatically or by pressing any key on it.")
)
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