Support for PGM and PPM at same time

.gitignore

@@ -0,0 +1,2 @@
+.idea
+imagemorph

Makefile

@@ -1,7 +1,7 @@
 FLAGS =  -pedantic -Wunused -Wunused-function -Wunused-parameter -Wunused-variable -Wall 
 #        -pg
 imagemorph:	imagemorph.o Makefile
-	gcc $(FLAGS) imagemorph.o -static -static-libgcc -lm  -o imagemorph
+	gcc $(FLAGS) imagemorph.c -lm  -o imagemorph
 
 clean:
 	\rm imagemorph imagemorph.o

README.md

@@ -1,10 +1,49 @@
 # imagemorph.c
-Program to apply random elastic rubbersheet  transforms to Netpbm color (.ppm) images for  augmenting training sets in machine learning/deep learning.  The program reads an input .ppm image from stdin and writes a ppm image to stdout.  Original Author: Marius Bulacu (.pgm version for characters). Adapted for .ppm and color: Lambert Schomaker
 
+Program to apply random elastic 'rubbersheet' transforms to Netpbm images (.ppm P6 raw binary and .pgm P5 raw binary) images for augmenting training sets in machine learning.
+
+The program reads an input image from stdin and writes a ppm or pgm image to stdout.
+
+Original Author: Marius Bulacu (.pgm version for characters)
+
+Adapted for .ppm and color: Lambert Schomaker
+
+Adapted for .ppm and .pgm: Nick Ubels
+
 Please cite:
 
-M Bulacu, A Brink, T van der Zant, L Schomaker (2009).
-Recognition of handwritten numerical fields in a 
-large single-writer historical collection,
-10th International Conference on Document Analysis and Recognition, 
-pp. 808-812, DOI: 10.1109/ICDAR.2009.8 
+> M Bulacu, A Brink, T van der Zant, L Schomaker (2009).
+> Recognition of handwritten numerical fields in a 
+> large single-writer historical collection,
+> 10th International Conference on Document Analysis and Recognition, 
+> pp. 808-812, DOI: 10.1109/ICDAR.2009.8 
+
+## Usage:
+
+First compile with `make imagemorph`.
+
+For .ppm (P6 raw binary) images:
+
+`imagemorph  [displacement] [smoothing radius] < input.ppm > random-morph.ppm`
+
+For .pgm (P5 raw binary) images:
+
+`imagemorph  [displacement] [smoothing radius] < input.pgm > random-morph.pgm`
+
+Parameters are real values
+
+### Example
+Input:
+
+![input](sample-input.png)
+
+Output:
+
+![output](sample-output.png)
+
+PS Please note that for an even more realistic augmentation
+of handwriting training data, also random slant (shear) and
+ink thickness, using mathematical morphology are needed
+as additional deformations.
+
+Lambert Schomaker