Data compression method and apparatus and data expansion method and apparatus

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a data compression method and apparatus capable of compressing image data by increasing a compression rate by applying a run length method.
It is another object of the present invention to provide a data expansion method and apparatus capable of expanding compressed image data.
It is another object of the present invention to provide a data compression method and apparatus capable of storing a large amount of image data in a small memory capacity.
It is still another object of the present invention to provide a data compression method and apparatus capable of increasing a compression rate of image data by increasing white data or black data portion in an image data, and then performing run length coding.
It is still another object of the present invention to provide a printing apparatus capable of reducing the amount of image data stored in a memory by compressing and storing input image data, expanding the compressed image data, and developing the data to a character pattern to print out.
It is still another object of the present invention to provide a printing apparatus capable of storing compressed character font data, and developing it to a character pattern to print out.
It is still another object of the present invention to provide a printing apparatus capable of storing a large amount of font data in a small memory capacity by storing character font data at high compression rate as font data, and expanding the character font to print out.
Other features and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof.