Image data processing method and apparatus

Details Image data processing method and apparatus Image data processing method and apparatus

G - Physics

06

T

G06T 5/50 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01)

Patent

CA 2048882

An image data reconstructing method and apparatus, adaptive to both progressive and sequential image buildup modes, reconstructs an orthogonally transformed image by dequantizing transform coefficients decoded from coded data of a continuous tone image, by causing the transform coefficients to have a common data structure through an attachment of a dummy signal representing a zero value DC element. The image data reconstructing method comprises a coded data decoding step, a common data structure one- dimensional quantized transform coefficient creating step, a one-to-two dimensional quantized transform coefficient transforming step, a dequantization threshold storing step, and a two-dimensional quantized transform coefficient dequantizing step. The image data reconstructing apparatus comprises a dummy signal generator for generating such dummy signals and a selector for selecting the dummy signals.

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