##jpeg toolbox

this toolbox was written to extract the dct coefficient of jpeg images. The python interface is wrapped via boost-python.

1. dependencies

cmake
boost-python
python-devel
libjpeg

2. compilation

mkdir build
cd build
cmake ..
make

3. usage

3.1 c/c++ interface

the struct jpegobj

typedef struct jpegobj{
  int image_width;
  int image_height;
  int image_components;
  int image_color_space;
	int quant_nums;
	int coef_array_shape[4][2];
  double *quant_tables;  // n*dctsize*dctsize
  double **coef_arrays; // num_component * each dimension size
} jpegobj;

in test_jpeg_read.c:

const char *image = "../demo.jpg";
printf("%s\n",image);
jpegobj obj = read_jpeg(image);

3.2 python interface

it returns a dict, which has the same properties as struct jpegobj

usage example:

import sys
sys.path.append('./python')
import jpegtools

jpeginfo = jpegtools.read_jpeg('./demo.jpg')
print jpeginfo