Use Image Arithmetic to scale images, combine information from multiple images, and subtract images in order to isolate features.
Image Arithmetic calculates an output image from one or two input images by applying one of several operations. The input images may come from one or two windows or files. To create the image, specify the input images (files or windows), the wavelength number of image 1, the wavelength number of image 2, the arithmetic operation, and any necessary coefficients.
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Note In order for the calculation to be processed, the input images must have the same X, Y, and Z dimensions. |
Open Image Arithmetic by choosing Filter | Image Arithmetic from the main softWoRx menu.
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Field |
Description |
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Image 1 |
The first input image - a file or window. |
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Image 2 |
The second input image - a file or window. |
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Result |
The destination of the image arithmetic operation - a file or window. The image in this window is in floating-point format and the wavelength is undefined. |
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Image 1 Wave |
The wavelength number of Image1 to use as input. |
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Image 2 Wave |
The wavelength number of Image2 to use as input. |
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Equation |
The arithmetic equation to be calculated, showing all terms. |
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Operation |
The operation applied within the arithmetic equation. |
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Process Image 1 |
Enables or disables processing of Image 1. When off, the equation only operates on Image 2. |
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A1 |
Coefficient A1, multiplied by Image 1, in the arithmetic equation. |
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B1 |
Term B1, added to the product of A1 and Image 1. |
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Process Image 2 |
Enables or disables processing of Image 2. When off, the equation only operates on Image 1. |
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A2 |
Coefficient A2, multiplied by Image 2, in the arithmetic equation. |
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B2 |
Term B2, added to the product of A2 and Image 2. |
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Absolute Value |
Specifies to use only the absolute value of the arithmetic result. |
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Log Transform |
Calculates the log (base 2) transform of the arithmetic result. |
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Exp Transform |
Calculates the exponential transform of the arithmetic result. |
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Apply Thresholds |
Applies low and high thresholds to the arithmetic result. |
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Low Threshold |
The lowest allowed value. |
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High Threshold |
The highest allowed value. |
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Auto Scale |
Automatically scales the result to fit between the corresponding low and high values. The minimum value of the image is scaled such that it becomes equal to Low. Similarly, the maximum value is scaled to High. This is the last image processing step. |
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Low |
The lowest value of the scaled image. |
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High |
The highest value of the scaled image. |
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