Abstract: A method for extracting a shape variation descriptor from image sequence data for content-based image retrieval is disclosed. The method for extracting the shape variation descriptor from image sequence data for content-based image retrieval, image sequence data representing variation of object through a plurality of frames, the method includes the steps of creating a frame including variation information and shape information by accumulating the plurality of frames, the centroid of object regions in each frame aligned; and extracting shape descriptor from the frame.

Abstract: A content-based image retrieval system retrieves an image based on an angular radial transform (ART) image descriptor. In the content-based image retrieval system, a method for retrieving an image includes the steps of: a) receiving a query image; b) extracting a query image descriptor from the query image based on at least an angular component and a radial component of the query image; c) comparing the query image descriptor with an image descriptor stored on the database; and d) determining a degree of a similarity between the query image descriptor and the image descriptor stored on the database.

Abstract: The present invention relates to method for processing colour image on image processing system. The method for processing colour image on image processing system includes the steps of: extracting from the colour image hue, luminance and saturation which are the factors of the colour image; setting the saturation factor as predetermined constant by normalizing the saturation factor; transforming the colour image into complex number using the hue factor and luminance factor. Accordingly, an image processing system can reduce the load of colour image processing by way of present invention that reduces the redundancy between the factors of colour images through transforming the three factors of the colour image into complex number.

Abstract: A content-based image retrieval system retrieves an image based on an angular radial transform (ART) image descriptor. In the content-based image retrieval system, A method for retrieving an image includes the steps of: a) receiving a query image; b) extracting a query image descriptor from the query image based on at least an angular component and a radial component of the query image; c) comparing the query image descriptor with an image descriptor stored on the database; and d) determining a degree of a similarity between the query image descriptor and the image descriptor stored on the database.

Abstract: An image encoding/decoding system (10) includes an encoder section (12) and a decoder section (14). The encoder section (12) includes an image detector (15), a transform processor (16), a quantizer (18), a zig-zag process memory (20), and a run/variable length encoder (22). The decoder section includes a variable/run length decoder (24), a dequantizer (26), a zig-zag deprocess memory (28), and an inverse transform processor (30). The inverse transform processor (30) within the decoder section (14) uses basis functions (58) based on a discrete articulated trapezoid transform for ease of realizability in decoding image data. The discrete articulated trapezoid transform may also be used by the transform processor (16) within the encoder section (12) for the encoding of detected images.