Image Overlaying I

Building the Cantata Workspace

• Building the zoomed image.

  Select an image to work with. Extract a small region from it, say 8x8 using the operator Extract and expand it by a factor of 20 using the operator Expand.

• Building the line-grid image.
  1. Use the Piecewise Linear operator to create the line-grid image. Look at the Trapezoidal Data lesson to find out the proper parameter to generate this image.
  2. Create another similar image, but with horizontal lines and make and union (maximum) of both using the operator Maximum.
  3. The image created will have zero as background and the lines with values 255. To invert the image, use the operator Subtract From with parameter 255.

• Combining the images.

  Use the operator Minimum applied to the zoomed and the line-grid image.

Exercises

• Experiment by changing the pixel values for the line-grid image and by modifying the magnification factor.
• Create your own grid image.