Table Of Contents

SSIM (Fast SSIM) (G Dataflow)

Last Modified: June 25, 2019

Determines the structural similarity of a test image by comparing it to a reference image.

Fast SSIM uses gradient information for an entire local window to reduce computational complexity. Choose Fast SSIM when the image contains clear structural information, such as strong edges.

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test image in

Reference to the image whose quality you want to determine by comparing it with reference image.

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reference image

Image against which the quality of test image in is checked.

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SSIM image dst in

Reference to the destination image for the result SSIM image.

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window size

Size of the local window.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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test image out

Reference to the image whose quality you want to determine by comparing it with reference image.

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SSIM image dst out

Reference to the destination image for the result SSIM image.

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mean SSIM

Mean SSIM for all local windows.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.
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SSIM components

Cluster that returns the luminance and contrast & structural terms of the SSIM, averaged over all local windows.

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luminance

Constant which ensures that the denominator for luminance is non-zero.

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contrast & structural

Constant which ensures that the denominators for contrast and structural are non-zero.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application


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