Image Processing Vertical Sobel Filter The Vertical Sobel operation acts like a gradient filter. This has the effect of highlighting ver- tical edges (gradients) in the image. The kernel size can be 3, 5 or 7. The absolute clipping method is usually used with this filtering operation. The kernels used by the Image Pro- cessing Tool are shown in the following figure. Vertical Sobel Filtering Kernels High Pass The High Pass operation acts like a circular gradient high pass filter. It essentially extracts high frequency details. This has the effect of highlighting all edges (gradients) in the image. The kernel size can be 3, 5 or 7.
The absolute clipping method is usually used with this fil- tering operation. The kernels used by the Image Processing Tool are shown in the following figure. High Pass Filtering Kernels ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 517