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Ultrasonic image noise suppression method

An ultrasound image and noise suppression technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as difficulty in guaranteeing, and achieve the best noise reduction effect.

Inactive Publication Date: 2012-08-22
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0008] However, when the prior art adopts the above method to suppress the speckle noise in the ultrasound image, it is difficult to ensure that the key useful information in the image will not be destroyed while effectively suppressing the noise.

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Embodiment Construction

[0028] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0029] Please refer to figure 1 , a kind of ultrasonic image noise suppressing method provided by the present invention, specifically as follows:

[0030] S101: Perform logarithmic transformation on the ultrasonic image I to obtain a logarithmic image I';

[0031] S102: extract the edge signal area of ​​the logarithmic image;

[0032] In this step, the edge signal area of ​​the logarithmic image I' is calculated Edge signal area m 1 is the set of signal edge points of the image I' in the space domain, is the area mean value of the point coefficient in the 3×3 rectangular window; δ I’ is the standard deviation of the image I', and the parameter k usually takes a value of 1.5 to 3;

[0033] At the same time, the points of the image I' outside the edge signal area constitute its signal stable area m 2 .

[0034]...

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Abstract

The invention provides an ultrasonic image noise suppression method which comprises the steps of: 1, carrying out logarithmic transformation on an ultrasonic image to obtain a logarithmic image; 2, extracting an edge signal area of the logarithmic image; 3, carrying out non-downsampling contourlet transformation to obtain a plurality of high-frequency sub-bands; 4, extracting an edge signal area and a signal stable area of each high-frequency sub-band; 5, carrying out noise reduction on each high-frequency sub-band in the edge signal area and the signal stable area; 6, carrying out non-downsampling contourlet inverse transformation on the high-frequency sub-bands subjected to noise reduction; and 7, carrying out exponential transformation on the image obtained in the step 6 to obtain a final noise reduction image. By adopting the noise reduction method provided by the invention, speckle noise can be effectively suppressed, detail information in the ultrasonic image is reserved largely, and a better noise reduction effect is achieved.

Description

technical field [0001] The invention relates to the field of ultrasonic image processing, in particular to an ultrasonic image suppression method based on non-subsampling contourlet domain. Background technique [0002] Ultrasonic imaging is a method and technology that uses ultrasonic waves to irradiate a test object, and obtains visible images of the tissue properties and structures of the test object by receiving and processing echoes that carry characteristic information of the internal tissue or structure properties of the test object. Ultrasound imaging has the advantages of low price, good real-time imaging, non-invasiveness to patients, and easy to carry and use. Therefore, it has been widely used in the field of medical imaging. [0003] At present, research on adjuvant therapy based on quantitative analysis of ultrasound images is gradually emerging, such as: extraction of vessel wall edge and measurement of vessel lumen area in intravascular ultrasound images, les...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 闫晟原建平侯朝焕
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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