1.0: init

Author: zvezdochiot

.gitmodules

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+[submodule "src/djvulibre"]
+	path = src/djvulibre
+	url = https://github.com/barak/djvulibre

LICENSE

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+#MFBdjvu-1.0
+#
+#Based on djvulibre (http://djvu.sourceforge.net/)
+#Based on monday2000 (http://djvu-soft.narod.ru/)
+#Based on DjVu Thresholding Binarization (http://djvu-soft.narod.ru/bookscanlib/034.htm)
+#Based CLI of simpledjvu (https://github.com/mihaild/simpledjvu).
+#
+#MFBdjvu is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+#
+#You should have received a copy of the GNU General Public License
+#along with Simpledjvu.  If not, see <http://www.gnu.org/licenses/>.
+
+PROJECT = mfbdjvu
+DJVULIBRE_PATH = src/djvulibre
+CXX = g++ -O3 -std=c++0x
+INCLUDES = -I$(DJVULIBRE_PATH) -I$(DJVULIBRE_PATH)/libdjvu -I$(DJVULIBRE_PATH)/tools -Isrc
+CXXFLAGS = $(INCLUDES) -DHAVE_CONFIG_H -pthread -DTHREADMODEL=POSIXTHREADS
+LDFLAGS = -ldjvulibre
+LN = $(CXX) -DHAVE_CONFIG_H
+RM = rm -f
+
+OBJ_FILES = src/mfbdjvu.o src/pgm2jb2.o src/jb2tune.o src/jb2cmp/libjb2cmp.a
+BIN_FILES = $(PROJECT)
+
+all: djvulibre_config $(BIN_FILES)
+
+$(PROJECT): $(OBJ_FILES)
+	$(LN) $^ $(LDFLAGS) -o $@
+
+%.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+src/jb2cmp/libjb2cmp.a: 
+	cd src/jb2cmp && ${MAKE}
+
+djvulibre_config:
+	cd src/djvulibre && ./autogen.sh
+
+clean:
+	$(RM) $(OBJ_FILES) $(OBJ_FILE_PGM) $(BIN_FILES)
+	cd src/jb2cmp && ${MAKE} clean

Makefile

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+# MFBdjvu
+
+MFBdjvu is a simple project for easy converting pgm and ppm to (MASK+FG+BG)-djvu.
+It uses [djvulibre](http://djvu.sourceforge.net/) for all technichal work and compression.
+The breakdown of the image into components is done using [DjVuL](https://github.com/plzombie/depress/issues/2) and [DjVuL wiki](https://sourceforge.net/p/imthreshold/wiki/DjVuL/?version=3).
+
+MFBdjvu based of [simpledjvu](https://github.com/mihaild/simpledjvu).
+
+## Install
+
+### load submodules
+
+submodules:
+
+- [djvulibre](https://github.com/barak/djvulibre) -> [src](src)
+
+```shell
+$ git submodule init
+$ git submodule update
+```
+
+### build
+
+Typo:
+```shell
+$ make
+```
+
+If you want, you can change your PATH variable or copy **mfbdjvu** binary to any directory already included in your PATH.
+
+You need `g++` version supports `c++0x` standard flag.
+
+## Usage
+
+```shell
+simpledjvu [options] input.pnm output.djvu
+```
+
+where options =
+
+**-dpi n** {300} DPI output djvu.
+
+**-loss n** {1} Use *n* as cjb2 loss level (see djvulibre cjb2 tool description).
+
+**-slices_bg n1,n2,...** {74,89,89}. Use *n1,n2,...* as number of slices for c44 for background (see djvulibre c44 tool description).
+
+**-slices_fg n1,n2,...** {89} Use *n1,n2,...* as number of slices for c44 for foreground.
+
+**-levels n**  {0} Level DjVuL block, 0 - auto.
+
+**-bgs n** {3} Background and Foreground downsample.
+
+**-fgs n** {2} Foreground more downsample.
+
+**-overlay n** {50} Block overlay DjVuL in percent.
+
+**-anisotropic n** {0} The main regulator DjVuL in percent. More than zero - more details, less than zero - less details.
+
+**-contrast n** {0} Auxiliary regulator DjVuL in percent (sharpen).
+
+**-fbs n** {100} and **-delta n** {0} Additional regulation DjVuL of BG/FG according to the linear law: FG * fgs + delta != BG
+
+**-black** Using black BG as the base, not white.
+
+You can use [Netpbm](https://sourceforge.net/projects/netpbm/) or any other similar tool to obtain `pgm` or `ppm` from other format.
+
+## DjVuL description.
+
+The [base of the algorithm](https://sourceforge.net/p/imthreshold/wiki/DjVuL/?version=3) was obtained in 2016 by studying the works [monday2000](http://djvu-soft.narod.ru/) and adapting them to Linux.
+The prerequisite was the [BookScanLib](http://djvu-soft.narod.ru/bookscanlib/) project  and the algorithm [DjVu Thresholding Binarization](http://djvu-soft.narod.ru/bookscanlib/034.htm).
+This algorithm embodied good ideas, but had a recursive structure, was a "function with discontinuities" and had a hard color limit.
+The result of this algorithm, due to the indicated shortcomings and the absence of regulators, was doubtful.
+After careful study, all the foundations of the specified algorithm were rejected.
+The new algorithm is based on levels instead of recursion, a smooth weight function is used instead of a "discontinuous" one, no color restriction, BG/FG selection controls are enabled.
+The new algorithm allowed not only to obtain a much more adequate result, but also gave derivative functions: image division into BG/FG according to the existing mask.