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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 electric quantity or magnetic quantity. Can not meet the high-precision, large-capacity and real-time work of the imager, so as to achieve the effect of high precision

Inactive Publication Date: 2008-05-07
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
  • Coordinate transformation method for digital scanning change-over device and processor
  • Coordinate transformation method for digital scanning change-over device and processor

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Embodiment Construction

[0045] Below in conjunction with the best embodiment shown in the accompanying drawings, it will be further described in detail.

[0046] The coordinate conversion method used in the digital scan conversion device of the present invention is used to convert the input rectangular coordinate value (x0, y0) into a polar coordinate value (r, p) for output, comprising the steps of:

[0047] ①. The input and preprocessing module of the device receives x0 and y0 from the front-end circuit, assigns and outputs the constants and variables used, including:

[0048] The angle variable z(0) is initialized to 0;

[0049]symbol variable cout i initialized to 1;

[0050] Initialize the phase judgment variables Xs, Ys according to the Cartesian coordinate value (x0, y0), and convert the (x0, y0) into an unsigned number, namely:

[0051] If X0<0, then Xs=1; if Y0<0, then Ys=1; and (x0, y0)=(|x0|, |y0|);

[0052] 2. The CORDIC iterative operation module of the device carries out N iteration...

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