Canny edge detection

operators.image.canny_edge_detection(client, input_file='in.tif', output_file='out.tif', sigma=1.0, low_threshold=0.1, high_threshold=0.2, values_subset='', instance_type='x2large')

Perform Canny edge detection on a georeferenced image and save the detected edges as a raster.

canny_edge_detection( client,

input_file=’in.tif’,

output_file=’out.tif’,

sigma=1.0,

low_threshold=0.1,

high_threshold=0.2,

values_subset=’’,

instance_type=’x2large’ )

Parameters:

• input_file – Input image file

• output_file – Output edge raster file

• sigma – Standard deviation of the Gaussian filter

• low_threshold – Low threshold for hysteresis

• high_threshold – High threshold for hysteresis

• values_subset – Subset of values to extract contours from, all values by default

• instance_type – type of cloud instance used for processing