Sobel Dialog Box (Image Tool)
Perform a Sobel edge enhancement of an image.
Gradients—Computes the row and/or column gradient (horizontal/vertical line enhancement).
Edge—Choose how edge effects are handled. Edge options include:
Copy—Copies the border of the input image to the output image. Zero—Sets the border of the output image to zero. Create New Image—If this option is selected, the processed data is used to create a new image. Enter a name for the new image in the Sobel Output field.
Overwrite Image—If this option is selected, the current image is overwritten by the processed data.
Clipping—If unset, the data type of the result is greater than the original image data type. This prevents overflow values in the resulting image from being clipped. If set, data values may be clipped.
Scaling—If set, each gradient is scaled by the factor 0.25; otherwise, no scaling is performed.
Zero Negatives—If set, all negative values in the result are set to zero.
Return—Choose a mathematical function to apply to the result. Choice are Abs, Phase, and Value. The Return option is used with the Row and Column Gradient options per Table 3-1: Return Options.
Gradients | Return: Abs | Return: Phase | Return: Value |
|---|---|---|---|
Columns: On Rows: Off | ABS(col grad) | Invalid condition | Column gradient |
Columns: Off Rows: On | ABS(row grad) | Invalid condition | Row gradient |
Columns: On Rows: On | ABS(row grad) + ABS(col grad) | ATAN(row grad / col grad), data type is double | Invalid condition |
Columns: Off Rows: Off | Invalid condition | Invalid condition | Invalid condition |
Variable Suffix—If the Create New Image option is selected, enter a suffix for the new image variable name. This suffix is added to the original variable name.
OK—Perform the edge enhancement and exit the dialog box.
Apply—Perform the edge enhancement, but do not exit the dialog box.
Cancel—Dismiss the dialog box without taking any action.
Help—Display online Help on the dialog box.
