IMAQ EdgeDetection VI
Owning Palette: FiltersInstalled With: NI Vision Development ModuleExtracts the contours (detects edges) in gray-level values. Any image connected to the input Image Dst must be the same image type connected to Image Src. The image type connected to the input Image Mask must be an 8-bit image. The connected source image must have been created with a border capable of supporting the size of the processing matrix. For example, a 3 × 3 matrix has a minimum border size of 1. The border size of the destination image is not important.
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Note This VI modifies the source image. If you need the original source image, create a copy of the image using the IMAQ Copy VI before using this VI. |
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Threshold Value is the minimum pixel value to appear in the resulting image. It is rare to use a value greater than 0 for this type of processing because the results from this processing are usually very dark and are not very dynamic. The default is 0. |
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Image Src is a reference to the source image. |
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Image Mask is an 8-bit image that specifies the region of the small image that will be copied. Only those pixels in the Image Src (Small) image that correspond to an equivalent non-zero pixel in the mask image are copied. All other pixels keep their original values. The entire image is processed if Image Mask is not connected. |
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Image Dst is a reference to the destination image. |
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error in (no error) describes the error status before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
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Method specifies the type of edge-detection filter to use. The default is Differentiation. The following filters are valid:
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Image Dst Out is a reference to the destination image. If Image Dst is connected, Image Dst Out is the same as Image Dst. Otherwise, Image Dst Out refers to the image referenced by Image Src. |
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error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.
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