Method and apparatus for encoding/decoding image in bitmap format

A method of decoding an image, the method comprising:

• extracting a bitmap index, a bitmap table, and a filter index from bitmap data;
• extracting an image mapped to the bitmap index from the bitmap table and storing the extracted image in a storage unit;
• and
• filtering the extracted image based on a filter corresponding to the filter index.

A method of encoding and decoding an image, the method comprising:

• encoding an image by:
• generating a bitmap table by mapping a quantized image, that is quantized according to a predetermined bit-depth, to a map table, and setting a bitmap index corresponding to each pixel location of the quantized image with reference to the bitmap table;
• setting a fixed filter index regarding an image of each pixel of the image by analyzing local characteristics of the image;
• and
• generating bitmap data by adding the filter index to the bitmap index;
• and
• decoding an encoded image by:
• extracting a bitmap index, a bitmap table, and a filter index from the bitmap data;
• extracting the encoded image mapped to the bitmap index from the bitmap table;
• and
• filtering the extracted encoded image based on a filter corresponding to the filter index.

An apparatus for encoding an image, the apparatus comprising:

• a bitmap data creator which generates a bitmap table by using a quantized image that is quantized to a predetermined bit-depth, and sets a bitmap index corresponding to each pixel location of the quantized image with reference to the bitmap table;
• a filter index creator which sets a fixed filter index regarding an image of each pixel of the image by analyzing local image characteristics of the image;
• and
• a merging unit which merges the bitmap index created by the bitmap data creator and the filter index created by the filter index creator.