Partial expansion method of encoded images and image processing apparatus

A method for partially displaying an image encoded on a macroblock basis in response to a user input, comprising:

• creating map data of the encoded image so as to be able to find a filestream position corresponding to a macroblock in the encoded image to be decoded;
• creating a shrunken image of the encoded image;
• receiving a first control request from a user to display a first part in the encoded image;
• displaying on a display device, a second part in the shrunken image corresponding to the first part in the encoded image;
• decoding macroblocks containing the first part in the encoded image, using the map data;
• and
• displaying on the display device, the first part in the encoded image using the decoded macroblocks so as to replace the second part in the shrunken image therewith.

An image processing apparatus for partially displaying an image encoded on a macroblock basis in response to a user input, comprising:

• a map data creating section to create a map data of the encoded image so as to be able to find a filestream position corresponding to a macroblock in the encoded image to be decoded;
• a shrunken image creating section to create a shrunken image of the encoded image;
• a receiving section to receive a control request from a user to display a first part in the encoded image;
• a displaying section to display on a display device, a second part in the shrunken image corresponding to the first part in the encoded image;
• and
• a decoding section to decode macroblocks containing the first part in the encoded image, using the map data;
• wherein the displaying section displays on the display device, the first part in the encoded image using the decoded macroblocks so as to replace the second part in the shrunken image therewith.