ScaleImage

ScaleImage re-samples the pixels in an input image or region of interest (ROI) to produce a reduced, enlarged, unrotated or unbent version of the image. The function displays the re-sampled image in the upper-left corner of the In-Sight spreadsheet.

ScaleImage Inputs

Parameter	Description
Image	This parameter must use Cell References in a spreadsheet cell that contains an Image data structure; by default, this parameter references A0, the cell containing the Image data structure returned by AcquireImage function. This parameter can also reference other Image data structures, such as those returned by the Vision Tool Image Functions.
Fixture	Defines the Region of Interest (ROI) relative to a Fixture input or the output of a Vision Tools function's image coordinate system. Setting the ROI relative to a Fixture ensures that if the Fixture is rotated or translated, the ROI will be rotated or translated in relation to the Fixture. The default setting is (0,0,0), the top leftmost corner of the image. X The X offset, in image coordinates. Y The Y offset, in image coordinates. Theta The rotation from the image X axis, in the image coordinate system. (+/-360 degrees clockwise)
Region	Also known as the Region of Interest (ROI), specifies the region of the image that undergoes analysis; creates an Interactive Graphics Mode that can be transformed and rotated. With this parameter selected, by pressing the Maximize Region button on the property sheet's Job Edit toolbar, the region will automatically be stretched to cover the entire image. X The x-offset of the origin, in fixture coordinates. Y The y-offset of the origin, in fixture coordinates. Width The dimension along the region's x-axis. Height The dimension along the region's y-axis. Angle The orientation, in fixture coordinates. Curve The angular deviation between the region's x-axis and the opposing boundary line.
X Scale	Specifies the percentage in the X direction of the region (10–1000; default = 50.) Note: Values between 100 and 1000 specify upsampling. For example, if both the ratios are specified as 200, the resampled image will be twice as large as the specified Region.
Y Scale	Specifies the percentage in the Y direction of the region(10–1000; default = 50.) Note: Values between 100 and 1000 specify upsampling. For example, if both the ratios are specified as 200, the resampled image will be twice as large as the specified Region.
Display X	Specifies the x-coordinate (default = 0) where the rescaled image will be displayed, relative to the upper left-hand corner. Note: Specifying a value of -1 will ensure that the function places the scaled image at the same x-coordinate as the input image: For acquired images, the Start x-coordinate specified in the AcquireImage function will be used. Therefore, if a ScaleImage function is configured with a Display X and Display Y parameter settings of 0,0, and the image was a partial acquisition, the ScaleImage function would display its output above the acquired image. For images output by other Vision Tools, such as an Image tool like the Filter function, the x-coordinate that defines the input image will be used. For example, if the PointFilter function is defined at the X / Y coordinates of 100,100, the referencing ScaleImage function with the -1 parameter setting would display at the x-coordinate of 100.
Display Y	Specifies the y-coordinate (default = 0) where the rescaled image will be displayed, relative to the upper left-hand corner.
Show	Specifies which graphical overlays are displayed on top of the image. 0 = hide all (default) The input region boundary and resampled image will be hidden, except when the cell containing the ScaleImage function is highlighted in the spreadsheet. 1 = result graphics only The resampled image will be displayed at all times. 2 = input graphics only The input region boundary will be displayed at all times.

ScaleImage Outputs

Returns

An Image data structure containing the processed image, or #ERR if any of the input parameters are invalid.

ScaleImage Example

In this example, the object in the input image is a bottle. The purpose of this example is to scale the size of the bottle to 50%.

After inserting the function into the In-Sight spreadsheet, the user defines the ROI by double-clicking on the word "Region" in the property sheet, which disappears to reveal the red ROI box overlaid on the image. The user moves or resizes the box using the cursor, and clicks the OK button on the Job Edit toolbar to confirm the selection and return to the property sheet. (The selection can also be confirmed by pressing the Enter key or by double-clicking within the ROI.)

Typing "50" in both the X Scale and Y Scale fields, accepting the default settings of the other parameters and clicking OK in the property sheet completes the configuration for this example and applies the function to the input image.

Below is a 50% scaled image of the bottle.

The user can also use ScaleImage to "unbend" or "unrotate" objects, which can make it easier to reference other tools to the processed output image. In this example, the object is a slightly curved segment, which is shown with the Overlay removed (achieved by clicking Overlay on the View menu). The segment will also be scaled to 50% in size, so that both the input image and output image can easily fit in the same view.

After inserting the function, defining the ROI and specifying "50" in both the X Scale and Y Scale fields in the property sheet (described earlier in the bottle example), the user incrementally changes the values in the Angle and Curve fields under the Region parameter until the object is straight. Accepting the default settings of the other parameters and clicking OK in the property sheet completes the configuration for this example and applies the function to the input image. Below is an image of the bent object in the middle and the smaller and "unbent" version in the upper-left corner.

In this example, an angle of 17.390 and a curve of -36.389 were needed to straighten the curved segment.