Image Histogram Image Subsampling The image subsampling function coarsely resamples the image in the tool region of interest. This is useful when the image does not contain high frequency transitions or textures. In such cases, the processing time is reduced, without having a negative impact on the accur- acy of the results. With a subsampling factor of 1, the greyscale image is not subsampled. With a subsampling factor of 2, the greyscale image is subsampled in tiles of 2x2 pixels. With a subsampling factor of 3 the greyscale image is subsampled in tiles of 3x3 pixels, and so forth. Results Logging If enabled, the results of the tool will be logged to a file.
If the extension of the destination file is csv, then the log is written in csv format, which opens with Excel. If a different extension is selected, the log is written in a plain text format (similar to the ACE Sight 2 format). The size of the log file can be set (default size is 5 Mb). Related Topics Image Histogram Configuring Image Histogram Properties Image Histogram Results Image Histogram Results The Image Histogram Tool outputs statistics about grey-levels for a selected region of interest. ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 497 Object Definition Custom Custom Sampling Step lets you set a sampling step value other than the default.
To select a cus- tom sampling step, Enable must be checked. Increasing the sampling step value reduces l the tool accuracy and decreases the exe- cution time. Reducing the sampling step can increase l the tool accuracy but will also increase the execution time.