USGS MIPS Lpf2b2 Documentation

USGS MIPS Lpf2b2 Documentation

This program applies a convolution filter to an image . The filter operator is the average of a 2x2 window. That is, given:

A B
C D

the result is,

(A + B + C + D) / 4

Note that A is the corresponding position in both the input and output images. For example, if A is located at (line,sample) = (100,200) in the input image then the average will be placed at (100,200) in the output image.

Files

This program requires as input an unsigned 8-bit or signed 16-bit image file and will produce the same type image file. The following information is transferred from the input file to the output file(if appropriate):

Image labels
Mosaic labels
Projection labels
Sonar labels
Navigation file
History file

Uses

Low pass filter operators such as mode, median, and averaging all defocus or blur the image. They can be used to suppress speckle in radar and sonar images.

The main advantage of a 2x2 filter over the other filter types is its small window size. Since the 2x2 filter is the smallest possible window, it produces the minimal amount of blurring. As the window size increases so does the amount of blurring.

Examples

Landsat MSS Band 6 and 2x2 Low Pass Filter.

[Example Image]