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I'm trying to do edge detection with SimpleCV on a RasPi by first finding all the lines in an image and then filtering items set based on location, intersect angle and color. I have the filtering figured out, but am having difficulty displaying the image with the filtered lines drawn in.

Currently I am can draw the full line set with

handle_lin = my_lines_full.draw()
handle_img = some_image.show()

and the filtered line set independently with 

handle_lin = my_lines_filtered.draw()
handle_img = some_image.show()

but since this method also displays the full line set, no difference is seen when I do them in the same script. Whats the best way to erase the layer that stores the line drawings or selectively remove elements of the drawing?

Jwhales
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1 Answers1

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Sovled(-ish):

Seems as though the some_lines.draw() command toggles line sets so by repeating the .draw() command before updating the lines set I can clear the layer that is displayed on the image.

Jwhales
  • 11
  • 1