Pdf renderer isn't working with jpg input images

[ArjanSchouten]

When I put a jpg wiith 24 bit depth into the pdf renderer the output is a corrupt pdf file. The text is still present in the file however the image is not present. Is this a known issue? Is this because libjpeg is not present?

I tried to compile tess-two with libjpeg with the following make file:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := libjpeg

LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)

LOCAL_SRC_FILES := jaricom.c jcapimin.c jcapistd.c jcarith.c jccoefct.c jccolor.c jcdctmgr.c jchuff.c jcinit.c jcmainct.c jcmarker.c jcmaster.c jcomapi.c jcparam.c jcprepct.c jcsample.c jctrans.c jdapimin.c jdapistd.c jdarith.c jdatadst.c jdatasrc.c jdcoefct.c jdcolor.c jddctmgr.c jdhuff.c jdinput.c jdmainct.c jdmarker.c jdmaster.c jdmerge.c jdpostct.c jdsample.c jdtrans.c jerror.c jfdctflt.c jfdctfst.c jfdctint.c jidctflt.c jidctfst.c jidctint.c jquant1.c jquant2.c jutils.c jmemmgr.c jmemname.c

include $(BUILD_STATIC_LIBRARY)

I changed the leptonica make file to:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := liblept

# leptonica (minus freetype)

BLACKLIST_SRC_FILES := \
  %endiantest.c \
  %freetype.c \
  %xtractprotos.c

LEPTONICA_SRC_FILES := \
  $(subst $(LOCAL_PATH)/,,$(wildcard $(LEPTONICA_PATH)/src/*.c))

LOCAL_SRC_FILES := \
  $(filter-out $(BLACKLIST_SRC_FILES),$(LEPTONICA_SRC_FILES))

LOCAL_CFLAGS := \
  -DHAVE_CONFIG_H \
  -DHAVE_LIBJPEG

LOCAL_LDLIBS := \
  -lz

# jni

LOCAL_SRC_FILES += \
  box.cpp \
  boxa.cpp \
  pix.cpp \
  pixa.cpp \
  utilities.cpp \
  readfile.cpp \
  writefile.cpp \
  jni.cpp

LOCAL_C_INCLUDES += \
  $(LOCAL_PATH) \
  $(LEPTONICA_PATH)/src \
  $(LIBPNG_PATH) \
  $(LIBJPEG_PATH)

LOCAL_LDLIBS += \
  -ljnigraphics \
  -llog

# common
LOCAL_SHARED_LIBRARIES := libpngt
LOCAL_STATIC_LIBRARIES += libjpeg
LOCAL_PRELINK_MODULE := false

include $(BUILD_SHARED_LIBRARY)

I can't find that jpg's are not supported by tesseract. However I'm not sure if libjpeg is needed for this. Do I need libjpeg for this and if yes can't we include it into tess-two?

I asked this question also on stackoverflow: http://stackoverflow.com/questions/33394810/tesseract-pdf-renderer-with-24-bit-depth-jpg-image

[ArjanSchouten]

@rmtheis just got it working. Compiled libjpeg wrong. Now I've compiled tess-two with libjpeg and it's working! Isn't it an idea to bundle libjpeg by default with tess-two?

Final leptonica Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := liblept

# leptonica (minus freetype)

BLACKLIST_SRC_FILES := \
  %endiantest.c \
  %freetype.c \
  %xtractprotos.c

LEPTONICA_SRC_FILES := \
  $(subst $(LOCAL_PATH)/,,$(wildcard $(LEPTONICA_PATH)/src/*.c))

LOCAL_SRC_FILES := \
  $(filter-out $(BLACKLIST_SRC_FILES),$(LEPTONICA_SRC_FILES))

LOCAL_CFLAGS := \
  -DHAVE_CONFIG_H \
  -DHAVE_LIBJPEG

LOCAL_LDLIBS := \
  -lz

# jni

LOCAL_SRC_FILES += \
  box.cpp \
  boxa.cpp \
  pix.cpp \
  pixa.cpp \
  utilities.cpp \
  readfile.cpp \
  writefile.cpp \
  jni.cpp

LOCAL_C_INCLUDES += \
  $(LOCAL_PATH) \
  $(LEPTONICA_PATH)/src \
  $(LIBPNG_PATH) \
  $(LIBJPEG_PATH)

LOCAL_LDLIBS += \
  -ljnigraphics \
  -llog

# common
LOCAL_SHARED_LIBRARIES := libpngt libjpegt
LOCAL_PRELINK_MODULE := false

include $(BUILD_SHARED_LIBRARY)

Libjpeg Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := libjpegt

LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)

LOCAL_SRC_FILES := jaricom.c jcapimin.c jcapistd.c jcarith.c jccoefct.c jccolor.c jcdctmgr.c jchuff.c jcinit.c jcmainct.c jcmarker.c jcmaster.c jcomapi.c jcparam.c jcprepct.c jcsample.c jctrans.c jdapimin.c jdapistd.c jdarith.c jdatadst.c jdatasrc.c jdcoefct.c jdcolor.c jddctmgr.c jdhuff.c jdinput.c jdmainct.c jdmarker.c jdmaster.c jdmerge.c jdpostct.c jdsample.c jdtrans.c jerror.c jfdctflt.c jfdctfst.c jfdctint.c jidctflt.c jidctfst.c jidctint.c jquant1.c jquant2.c jutils.c jmemmgr.c jmemname.c

include $(BUILD_SHARED_LIBRARY)

[rmtheis]

Cool--thanks for the follow-up. I'm glad to hear that adding libjpeg built and worked for you. Yes I do think it should be added back in.

[ArjanSchouten]

Ok should be nice when libjpeg is in the project. Saw you're using android's external png library.
I tried to use the jpeg version of it but that failed. Now I'm using http://www.ijg.org/files/jpegsr8c.zip. But you probably saw that on stackoverflow.

[rmtheis]

@ArjanSchouten I don't understand how having libjpeg would help resolve this specific problem. But libjpeg has been added to the project and it lets you do some cool stuff generally so I think it's a good addition.

[ArjanSchouten]

My input image was a color jpg image. You have created a fallback when the image isn't read by leptonica. However this returns a greyscale bitmap. To be able to read a jpg by leptonica you need libjpeg.

I'm sorry that I hadn't enough time to send a PR with libjpeg.