Slitscan Radial Clock

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Description: In this example we use the oF video grabber to sample camera input. Then the code accesses the pixels in each frame from the camera to create a slitscan video. The image is created in two styles, progressively across the screen or as a ribbon, pushing pixels sampled from the center of the screen. rendered to the screen as a flat, horizontal image or using oftransform to display as a radial image.

code in C++ using openFrameworks.cc for timeLapse radial slitscan clock

#Controls

• 1: slitscan ribbon horizontal
• 2: slitscan clock horizontal
• c: toggle debug text and camera preview
• f: toggle fullscreen
• r: toggle drawing anystyle scan as radial clock

Horizontal horizontal-push-ribbon horizontal-clock.png radial-push-ribbon radial-clock.png

Learning Objectives

This openFrameworks extends the videograbber example is designed to illustrate accessing and manipulating image data from a webcam.

Studying this example will help you understand:

• how to print a list of available webcam devices (ofVideoDevice)
• how to initiate ofVideoGrabber
• how to allocate memory on your graphics card for an ofTexture or for ofPixels
• how to iterate through a webcam frame's pixels (by accessing its ofPixels)
• how to manipulate the webcam image and read data from an image into another image object
• how to use ofTransform to display image data in various ways
• how to load and use a truetype font

Expected Behavior

If your computer has a webcam, you should be able to see the webcam image when launching this app on the left and an inverted version of the webcam stream on the right.

Classes used in this example

This example uses the following classes:

• ofVideoGrabber
• ofPixels
• ofTexture
• ofTrueTypeFont