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+.help blkavg Oct85 images.imgeom
+.ih
+NAME
+blkavg -- block average or sum n-dimensional images
+.ih
+USAGE	
+.nf
+blkavg input output b1 b2 b3 b4 b5 b6 b7
+.fi
+.ih
+PARAMETERS
+.ls input
+List of images to be block averaged.  Image sections are allowed.
+.le
+.ls output
+List of output image names.  If the output image name is the same as the input
+image name then the block averaged image replaces the input image.
+.le
+.ls b1
+The number of columns to be block averaged (dimension 1, or x).
+.le
+.ls b2
+The number of lines to be block averaged (dimension 2, or y).
+.le
+.ls b3
+The number of bands to be block averaged (dimension 3, or z).
+.le
+.ls b4
+The number of pixels to be block averaged in dimension 4 (... etc. for b5-b7).
+.le
+.ls option = "average"
+Type of block average.  The choices are "average" and "sum".
+.le
+.ih
+DESCRIPTION
+The list of input images are block averaged or summed to form the output images.
+The output image names are specified by the output list.  The number of
+output image names must be the same as the number of input images.
+An output image name may be the same
+as the corresponding input image in which case the block averaged image replaces
+the input image.  The last column, line, etc. of the output image may be
+a partial block.  The option parameter selects whether to block average
+or block sum.
+.ih
+TIMINGS
+It requires approximately 10 cpu seconds to block average a 512 by 512
+short image by a factor of 8 in each direction (Vax 11/750 with fpa).
+.ih
+EXAMPLES
+1. To block average a 2-d image in blocks of 2 by 3:
+
+    cl> blkavg imagein imageout 2 3
+
+2. To block sum two 2-d images in blocks of 5 by 5:
+
+    cl> blkavg image1,image2 out1,out2 5 5 op=sum 
+
+3. To block average a 3-d image by 4 in x and y and 2 in z:
+
+    cl> blkavg imagein imageout 4 4 2
+
+		or
+
+    cl> blkavg imagein imageout b1=4 b2=4 b3=2
+.endhelp