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Embedded zerotree wavelet coding method and device

An embedded zero tree and wavelet coding technology, applied in the field of image coding, can solve problems such as inapplicability and low coding efficiency

Inactive Publication Date: 2011-04-20
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method will result in many small zero trees, reducing coding efficiency, and is not suitable for hardware implementation of bottom-up scan order

Method used

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  • Embedded zerotree wavelet coding method and device
  • Embedded zerotree wavelet coding method and device
  • Embedded zerotree wavelet coding method and device

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Embodiment Construction

[0018] Features and exemplary embodiments of various aspects of the invention will be described in detail below. The following description covers numerous specific details in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a clearer understanding of the present invention by showing examples of the present invention. The present invention is by no means limited to any specific configuration and algorithm presented below, but covers any modification, replacement and improvement of related elements, components and algorithms without departing from the spirit of the present invention.

[0019] figure 1 A block diagram of an embedded zerotree wavelet encoding device according to an embodiment of the present invention is shown. Such as figure 1 As shown, the ...

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Abstract

The invention discloses embedded zerotree wavelet coding method and device. The embedded zerotree wavelet coding method comprises the following steps of: decomposing an input image into a plurality of wavelet decomposed subbands; adding all wavelet coefficients of the plurality of wavelet decomposed subbands to a primary wavelet coefficient table, and setting a secondary wavelet coefficient table to be empty; coding all the wavelet coefficients of the plurality of wavelet decomposed subbands bit plane by bit plane in two stages of a primary control procedure and a secondary control procedure according to a sequence from a highest bit plane to a lowest bit plane, wherein processing all the wavelet coefficients of the plurality of wavelet decomposed subbands one by one in the bit plane n; in the stage of the primary control procedure, judging whether the absolute value of one wavelet coefficient of the primary wavelet coefficient table is larger than or equal to 2n or not, and if so, generating a POS or NEG sign according to a sign bit of the wavelet coefficient; adding the wavelet coefficient to the secondary wavelet coefficient table; and setting the wavelet coefficient as zero in the primary wavelet coefficient table.

Description

technical field [0001] The present invention relates to the field of image coding, in particular to an embedded zero-tree wavelet coding method and device. Background technique [0002] Image coding algorithm is a technology to reduce the amount of digital image data at the cost of acceptable distortion for further image processing, storage and transmission. Because wavelet transform has good local characteristics in time domain and frequency domain, the image coding algorithm based on this transform has achieved great success in recent years. As a milestone in image coding technology based on wavelet transform, Embedded Wavelet Coding Algorithm (EZW) has achieved the best goal and visual coding performance at design time. [0003] By utilizing the energy packing property of wavelet transform and the similarity of positions between wavelet subband coefficients, EZW obtains very good objective and subjective coding performance. Since the EZW algorithm adopts a bit-plane cod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T9/00H04N7/26H04N19/63
Inventor 杨永明
Owner FUJITSU LTD
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