Medical ultrasonic image compression method based on the mixed wavelet coding

A technology of mixing wavelet and ultrasonic images, applied in the field of image processing, can solve the problem of low compression rate, and achieve the effect of improving image compression rate and wide application prospect.

Inactive Publication Date: 2007-10-17
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to propose a method suitable for partially lossy compression of medical ultrasound images, which overcomes the problem of low compression rate i...

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  • Medical ultrasonic image compression method based on the mixed wavelet coding
  • Medical ultrasonic image compression method based on the mixed wavelet coding
  • Medical ultrasonic image compression method based on the mixed wavelet coding

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and specific embodiment, the present invention will be further described:

[0023] The first step is the wavelet transform of the medical ultrasound image I. Perform wavelet transform on the imaging area, that is, W IA (I×MI), perform wavelet transform on the background area, that is, W BG (I×(1-IM) / S). The second step is to calculate the wavelet domain mask MW according to the shape mask MI of the imaging area of ​​the ultrasound image, and use formula (1) to complete the calculation. The third step is to encode the mixed wavelet coefficients with the wavelet coefficient coding algorithm and the set partition algorithm based on the hierarchical tree to obtain the image compression result.

[0024] The two medical ultrasound images in Fig. 1-Fig. 2 are used as the experimental objects. The shape mask of the imaging area in the image domain and the generated shape mask in the wavelet domain are shown in Fig. 3-Fig. 8. Am...

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Abstract

The invention provides a medicinal ultrasonic image compressing method based on wavelet coding, the method comprises: 1) peforming wavelet coding on a medicinal ultrasonic image I, peforming wavelet transformation on an imaging region, i.e., WIA (I*MI), and peforming wavelet transformation on a background region, i.e., WBG(I*(1-MI)/S), wherein MI represents a shape mark of the imaging region, function W represents integer lifting wavelet transformation, the lower corner sign IA represents a wavelet which performs transformation on the imaging region, the lower corner sign BG of the function W represents a wavelet which performs transformation on the imaging region, S is a size parameter; 2) calculating a wavelet domain mark MW based on the shape mark MI of the imaging region of the ultrasonic image, calculating a mixed wavelet parameter by the wavelet domain mark MW; 3) encoding the mixed wavelet parameter by a wavelet parameter encoding algorithm and based on a gather dividing algorithm of a delamination tree, obtaining an image compressing result. The invention improves compressing rate of the image while ensuring that information in a medicinal ultrasonic image diagnosis region has no damage, and has a wide application.

Description

(1) Technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a medical ultrasonic image compression method. (2) Background technology [0002] With the diversification and specialization of modern medical imaging technology, the types and quantities of digital medical images are increasing, and its huge data capacity has caused storage and transmission problems. Image compression is to transmit or store images with as few coded symbols as possible under the premise of ensuring the necessary image quality, or to make the quality of the restored image as good as possible given the number of coded symbols. [0003] Common image compression methods include Huffman coding, predictive coding, and transform coding. Huffman coding completely constructs the codeword with the shortest average length of characters based on the probability of character appearance. The algorithm first scans the image data once, calculates the ...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N19/63
Inventor 沈毅芦蓉
Owner HARBIN INST OF TECH
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