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Sobel Filter

Community NodesKNIME Image ProcessingImageFiltersStreamable
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The Sobel operator is used in image processing, particularly within edge detection algorithms. Technically, it is a discrete differentiation operator, computing an approximation of the gradient of the image intensity function. At each point in the image, the result of the Sobel operator is either the corresponding gradient vector or the normof this vector. The Sobel operator is based on convolving the image with a small, separable, and integer valued filter in horizontal and vertical direction and is therefore relatively inexpensive in terms of computations. On the other hand, the gradient approximation which it produces is relatively crude, in particular for high frequency variations in the image (see: http://en.wikipedia.org/wiki/Sobel_operator).

Node details

Input ports
  1. Type: Table
    Images
    Images
Output ports
  1. Type: Table
    Sobel Filtered Images
    Filtered Images

Extension

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