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Coordinate transformation method for digital scanning change-over device and processor

A technology of digital scanning transformation and coordinate transformation, which is applied in the direction of electrical digital data processing, digital data processing components, and devices that perform calculation operations by changing the amount of electricity or magnetism. High-precision, large-capacity and real-time work of the imager, inflexible performance adjustment, etc.

Inactive Publication Date: 2004-04-28
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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AI Technical Summary

Problems solved by technology

The method of using the look-up table has the disadvantages of limited capacity and high cost; the use of a special coordinate transformation chip has the disadvantage of inflexible performance adjustment; the method of building a special circuit, because the conversion from rectangular coordinates to polar coordinates is usually CORDIC ( Coordinate RotationDigital Computer (Coordinate Rotation Digital Computer) algorithm, but using the existing CORDIC algorithm to realize the conversion from Cartesian coordinates to polar coordinates is not enough to achieve flexible adjustment of performance parameters such as accuracy and speed, and cannot meet the high precision and large size of the imager. capacity and the requirement to work in real time

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  • Coordinate transformation method for digital scanning change-over device and processor
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  • Coordinate transformation method for digital scanning change-over device and processor

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Embodiment Construction

[0051] Below in conjunction with the best embodiment shown in the accompanying drawings, it will be further described in detail.

[0052] The present invention is used in the coordinate transformation method of digital scanning transformation device, in order to convert rectangular coordinate value (x0, y0) into polar coordinate value (r, p), comprises steps:

[0053] (1). Initialization process: assign the phase judgment variables Xs, Ys and the angle variable z(0) to 0, and set the sign variable cout i assign a value of 1;

[0054] (2). Preprocessing: Assign values ​​to the phase judgment variables Xs, Ys according to the Cartesian coordinate value (x0, y0), and convert (x0, y0) into an unsigned number: if X0<0, then Xs = 1; if Y0<0, then Ys=1;

[0055] And (x0, y0) = (|x0|, |y0|);

[0056] (3). The CORDIC algorithm operation is divided into two stages in turn:

[0057] The first stage: use the left shift operation to perform a iteration of the CORDIC algorithm, namely: ...

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Abstract

The coordinate transformation method and processor for digital scanning converter is used to transform the rectangular coordinate values (x0, y0) into polar coordinate values (r, p). The transformation method includes initialization; pre-treatment; CORDIC algorithm including a times of left-shift iterative operation and (N-a) times of right-shift iterative operation; radius correction and phase correction. The optimal implementation example of the processor includes input module, pre-treatment module, iterative operation module, radius correction module, phase correction module and output module. The coordinate transformation method and processor may be used in digital scanning converter of B-type ultrasonic imaging instrument for regulating precision, speed and other performance parameters flexibly.

Description

technical field [0001] The present invention relates to a data processing method and device for computing according to the number of digits or content of the data to be processed in the field of electric digital data processing, in particular to a coordinate conversion method and a processor used in a digital scan conversion device of a B-ultrasound imager . Background technique [0002] In the digital scan conversion device in the B-ultrasound imager involved in the prior art, to convert the Cartesian coordinate data for display into polar coordinate data, it can be realized by looking up a table, using a special coordinate conversion chip or building a circuit. The method of using the look-up table has the disadvantages of limited capacity and high cost; the use of a special coordinate transformation chip has the disadvantage of inflexible performance adjustment; the method of building a special circuit, because the conversion from rectangular coordinates to polar coordina...

Claims

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Application Information

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IPC IPC(8): A61B8/00G06F7/00G06G7/22
Inventor 何绪金王文芳
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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