Vision Laplace Edge
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This block is currently a beta version. If you are using this block, we would appreciate any feedback at tech@quanser.com. |
Calculates Laplacian of the input image.
Library
MATLAB Command Line
Click to copy the following command line to the clipboard. Then paste it in the MATLAB Command Window:
qc_open_library('quarc_library_beta/Image Processing/Open Source Computer Vision')Description
The Vision Laplace Edge block calculates Laplacian of the source image by summing second x- and y- derivatives calculated using Sobel operator:
edge_image(x,y) = d2src_image/dx2 + d2src_image/dy2.
In order to use this block, be sure to follow the instructions described on the Vision Capture Image page, and take careful note of the limitations.
Input Ports
src_image
A handle to a source image that uses OpenCV (Open Source Computer Vision) IplImage structure.
Output Ports
edge_image
A single-channel signed 16-bit image that shows Laplacian of the input image.
dst_image
Thresholded destination image in 8-bit binary format.
err
An error signal which is negative in case of invalid memory allocation or usage of invalid parameter values.
Parameters and Dialog Box
Input image
Specifies the type of input image to be used for edge detection. The available options are Gray, Blue,
Green, and Red. If the input image is a color image, this block either converts it into a grayscale image
or splits it into red, green, or blue color plane according to the specified parameter. On the other hand, if the input
is a grayscale or binary image, the edge detection algorithm is directly applied to it.
Kernel size
Specifies a kernel size of
Sobel operator to be convolved
with the input image. For kernel size 3×1 or 1×3, the kernel is defined as
|0 1 0|
|1 -4 1| .
|0 1 0|
Threshold
Specifies a 16-bit signed value for Laplacian thresholding.
Threshold type
Specifies the type of thresholding to be used. The options are BINARY and BINARY_INV. The options are described as follows:
BINARY:
dst_image(x,y) = 255, if edge_image(x,y)>Threshold
0, otherwise
BINARY_INV:
dst_image(x,y) = 0, if edge_image(x,y)>Threshold
255, otherwise
Sample time
The sample time of the block. A sample time of 0 indicates that the block will be treated as a continuous time block. A positive sample time indicates that the block is a discrete time block with the given sample time. A sample time of -1 indicates that the block inherits its sample time.
Targets
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Target Name |
Compatible* |
Model Referencing |
Comments |
|---|---|---|---|
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No |
No |
Not supported. |
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No |
No |
Not supported. |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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No |
No |
Not supported. |
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Rapid Simulation (RSIM) Target |
No |
No |
Not supported. |
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S-Function Target |
No |
N/A |
Old technology. Use model referencing instead. |
|
Normal simulation |
Yes |
Yes |
See Also
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