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Block Average Filter The Block Average Filter averages blocks of pixels into super pixels to increase the signal to noise ratio in return for reducing the spatial resolution. Also see the similar Block Sum Filter. This command updates several headers keywords that may be present. See Pixel Scale Sensitive FITS Keywords.
Block Average Filter Properties
Promoting the Pixel TypeBlock averaging averages the pixel values in each m x n block. Since the new value is an average of other pixel values, numerical overflow cannot occur in the output pixel. However, the resulting value has higher statistical significance since m x n values are averaged to calculate it. For an integer pixel type, this means the averaged values can be fractional. For example, averaging 4 integer pixel value can give a resulting value that is a while number plus 0.25, 0.5, or 0.75. If the pixel type was kept in integer form, the result would be rounded back to an integer value. If the pixel type was instead promoted to a floating point type, then the resulting pixels could represent the 0.25, 0.5, 0.75 excesses. ThePromote Pixel Type check box is provided to offer this option. There are cases in which the result should have an integer pixel type and other cases in which the increased significance is wanted. Related Topics
Mira Pro x64 8.83 User's Guide, Copyright Ⓒ 2026 Mirametrics, Inc.
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