Added coffee script examples based on opencv tutorials and updated blockWaitKey function.

examples/CoffeeScript Examples/blend-images.coffee

@@ -0,0 +1,31 @@
+cv = require 'opencv'
+
+# we create a function helper to display the images.
+displayImage = (windowName, img) ->
+  namedWindow = new cv.NamedWindow(windowName)
+  namedWindow.show(img)
+  namedWindow.blockingWaitKey(0, 5000)
+
+# Load both sources to be blended
+cv.readImage("./images/windows-logo.png", (err, src1) ->
+
+  # Display Source 1
+  displayImage('Source 1', src1)
+
+  # Load source #2
+  cv.readImage("./images/linux-logo.png", (err, src2) ->
+
+    # Display Source 2
+    displayImage('Source 2', src2)
+
+    # We use the addWeighted opencv wrapper to blend the images.
+    # we need to use a different image object, since src1 and src2
+    # will be manipulated.
+    result = new cv.Matrix(src1.width(), src2.height())
+    result.addWeighted(src1, 0.7, src2, 0.9)
+    result.save("./tmp/blended.png")
+
+    # Display Blended result 2
+    displayImage('Blended', result)
+  )
+)

examples/CoffeeScript Examples/camera.coffee

@@ -0,0 +1,41 @@
+cv = require 'opencv'
+
+# First we create a new VideoCapture object to get
+# video from the camera (0 for default camera)
+camera = new cv.VideoCapture(1)
+
+# we create a window to display the Video frames
+namedWindow = new cv.NamedWindow('Video',1)
+
+# We set an interval to retrieve frames from the
+# video source and we get the intervalId so we can
+# stop the program from the video feed window.
+intervalId = setInterval(()->
+
+  # camera.read allows us to retriebe the current
+  # frame to be displayed in the video window.
+  camera.read((err, im) ->
+    # We can check for errors and even break the
+    # program execution if an error is detected here.
+    console.lof "The err ==>#{ err }" if err
+
+    # There is no need to display the image width or Height
+    # but I leave this here in case anyone needs to check them.
+    #console.log("Width: #{im.width()}")
+    #console.log("height: #{im.height()}")
+
+    # We use the previously created namedWindow to display the
+    # video feed frame, we need to check the image is already
+    # available and has a width and height greated than 0,
+    # otherwise namedWindow.show() will fail if any of those is 0.
+    namedWindow.show(im) if im.width() > 0 and im.height() > 0
+
+    # Finally we get the key pressed on the window to terminate
+    # execution of the program.
+    res = namedWindow.blockingWaitKey(0, 20)
+    console.log("KEYPRESSED => #{ res } ")
+
+    # In this case I terminate the program if any key is pressed.
+    if res >= 0 then clearInterval(intervalId)
+  )
+, 500)

examples/CoffeeScript Examples/image-load-display.coffee

@@ -0,0 +1,22 @@
+cv = require('opencv')
+
+
+cv.readImage("./images/mona.png", (err, im) ->
+  # 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.")
+)

examples/CoffeeScript Examples/image-load-modify-display.coffee

@@ -0,0 +1,28 @@
+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.")
+)

src/HighGUI.cc

@@ -73,9 +73,14 @@ NamedWindow::BlockingWaitKey(const v8::Arguments& args){
   HandleScope scope;
 	//SETUP_FUNCTION(NamedWindow)
 	int time = 0;
+
   if (args.Length() > 0){
     time = args[1]->IntegerValue();
+  }else{
+    time = args[0]->IntegerValue();
   }
+
   int res = cv::waitKey(time);
+
 	return scope.Close(Number::New(res));
 }