Landsat+Lab+9


 * Landsat Lab 9 Spatial Convolution Filtering**

I applied an edge detector filter and a smoothing filter to a 2000 x 2000 pixel subset area of the 1984 Landsat image Path 197 Row 29.

The Sobel Edge Detector filter kernel size cannot be changed; however, this type of filter enhances the edges between different regions and sharpens the image by detecting both the horizontal and vertical edges and then adding them back (40%) into 60% of the original image to increase the contrast.



For the Low Pass Gaussian filter, I used two different kernel sizes – 5x5 and 9x9 with a 40% add back. The larger the kernel size, the more smoothing will occur since the center pixel value is an average of the surrounding values. The first image is 5x5 and the second is 9x9.