Image Labeler

1) Label New Image...
This opens an new image for labelling. It first searches the segmentation file (the same
name as the image file) in the directory of the image. If not found, it asks the user to 
specify one. Currently, only .jpg and .gif are supported.

2) Open Labeled Image...
This opens a labeled image(finished or not finished) for modification or labelling. 

3) Save...
This saves the results into a .lab file. The default file has the same name as the image file.
If the default file exists, the result file name is assigned by appending an index to the 
default file name. The index starts from 1 and is incremented by one each time. This procedure
repeats until such a file doesn't exist in the current directory. For example, the labeled
results for an image file '0100.jpg' will be saved as '0100_3.lab' if 0100.lab, 0100_1.lab
and 0100_2.lab all exists in the current directory.

4) Save As...
The same as above. 

5) Load Word List...
This loads a set of words from a file. It replaces the current list, but keeps the recently typed words.

6) Save Word List...

Labelling
Type the word in the edit field and hit 'enter' to go to the next segment.

The format of the output file
The output file is saved as a text file (.lab). including the absolute path for the image file, 
the path for the segmentation file and the words for segments.