CN110755063A - Low-delay electrocardiogram drawing method - Google Patents
Low-delay electrocardiogram drawing method Download PDFInfo
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- CN110755063A CN110755063A CN201811164535.7A CN201811164535A CN110755063A CN 110755063 A CN110755063 A CN 110755063A CN 201811164535 A CN201811164535 A CN 201811164535A CN 110755063 A CN110755063 A CN 110755063A
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- signal
- electrocardiographic
- rendering
- electrocardiosignals
- interface
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
- A61B5/339—Displays specially adapted therefor
Abstract
The invention discloses a low-delay electrocardiogram drawing method, which comprises the following drawing steps: (1) pre-calculating horizontal coordinates corresponding to all points in the drawing area; (2) acquiring and recording electrocardiosignals; (3) when the next electrocardiosignal is obtained, horizontally translating the signal in the step (2), simultaneously calculating the vertical coordinate of the newly added signal, and mapping the horizontal coordinate; (4) repeating the step (2) and the step (3) until the electrocardiosignal acquisition is stopped. The electrocardiogram drawing method provided by the invention enables the electrocardiosignals to continuously extend from one side of the drawing area to the other side, thereby achieving the purposes of reducing the calculation time of the horizontal and vertical coordinates of the electrocardiosignals, ensuring the continuity of obtaining the electrocardiosignals and facilitating the real-time obtaining of the electrocardiosignals.
Description
Technical Field
The invention relates to the field of electrocardiogram drawing, in particular to a low-delay electrocardiogram drawing method suitable for a smart phone platform.
Background
With the increasing importance of people on health and the increasing popularization of smart phones at the present stage, many APPs capable of displaying health states on smart phones currently exist. The electrocardiogram drawing is relatively common index reflecting health, in the traditional technology, the electrocardiogram drawing on an intelligent terminal (a smart phone, a tablet personal computer and the like) usually adopts a screen-brushing display mode, the mode is that an electrocardiogram signal diagram is drawn in a drawable fixed area, and then a new electrocardiogram signal is covered on the drawing area at a fixed time interval, so that the continuity of the electrocardiogram signal is seriously influenced, the accuracy of electrocardiogram analysis is reduced, meanwhile, the electrocardiogram information condition of a patient cannot be reflected at the first time in a mode of acquiring the electrocardiogram at the fixed time interval, and the instantaneity of acquiring the electrocardiogram is reduced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a low-delay electrocardiogram drawing method, so as to achieve the purposes of reducing the calculation time of the horizontal and vertical coordinates of an electrocardiosignal, ensuring the continuity of acquiring the electrocardiosignal and facilitating the real-time acquisition of the electrocardiosignal.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a low-delay electrocardiogram drawing method comprises the following drawing steps:
(1) pre-calculating horizontal coordinates corresponding to all points in the drawing area;
(2) acquiring and recording electrocardiosignals;
(3) when the next electrocardiosignal is obtained, horizontally translating the signal in the step (2), simultaneously calculating the vertical coordinate of the newly added signal, and mapping the horizontal coordinate;
(4) repeating the step (2) and the step (3) until the electrocardiosignal acquisition is stopped.
The invention provides a brand new electrocardiogram drawing method, which enables electrocardiosignals to continuously extend from one side to the other side of a drawing area, thereby achieving the purposes of reducing the calculation time of the horizontal and vertical coordinates of the electrocardiosignals, ensuring the continuity of obtaining the electrocardiosignals and facilitating the real-time obtaining of the electrocardiosignals.
Preferably, in the step (1), the pixel interval between the two signals is determined according to the signal sampling frequency of the electrocardiogram collecting device, the maximum number Smax of signals which can be drawn by the interface is calculated according to the maximum number of pixels of the electrocardiogram drawing interface, the abscissa corresponding to each signal is calculated, the abscissa set is recorded into the array XArray, the first element in the array is the abscissa of the leftmost signal point of the interface, and the last element in the array is the abscissa of the rightmost signal point of the interface.
Preferably, the step (2) converts the electrocardiosignals acquired each time into standard electrocardio-voltage signal values according to an electrocardio-format protocol. The signal values are recorded in the buffer array SBuffarray.
Preferably, in each signal drawing in step (3), the signal coordinate queue obtained by the previous drawing is fully utilized, and the vertical coordinate of the signal which is drawn last time is horizontally translated and simultaneously the vertical coordinate of the newly added signal is calculated by a method of mapping the horizontal coordinate without changing the vertical coordinate.
Preferably, the display of the electrocardiographic signals acquired in step (2) and step (3) is based on a rendering mode of an OpenGL ES high-performance graphics interface. By adopting the method, the rendering time of the electrocardiosignal graph is millisecond level each time, so that the electrocardiosignal graph is conveniently and smoothly displayed with high performance.
The invention has the following advantages:
1. the invention provides a brand new electrocardiogram drawing method, which enables electrocardiosignals to continuously extend from one side to the other side of a drawing area, thereby achieving the purposes of reducing the calculation time of the horizontal and vertical coordinates of the electrocardiosignals, ensuring the continuity of obtaining the electrocardiosignals and facilitating the real-time obtaining of the electrocardiosignals.
2. The method and the device display the signal diagram of the origin based on the rendering mode of the OpenGL ES high-performance graphic interface, so that the rendering time of each electrocardiosignal diagram is millisecond level, and the electrocardiosignal diagram is conveniently and smoothly displayed in high performance.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below.
The present invention will be described in further detail with reference to examples and specific embodiments.
In the actual use process, the electrocardiogram drawing steps are as follows:
1. the pixel interval between two signals is determined according to the signal sampling frequency of the electrocardiogram acquisition equipment, the maximum signal number Smax which can be drawn by an electrocardiogram drawing interface is calculated according to the maximum pixel number of the interface, the abscissa corresponding to each signal is calculated, an abscissa set is recorded into an array XArray, wherein the first element in the array is the abscissa of the leftmost signal point of the interface, and the last element is the abscissa of the rightmost signal point of the interface (the drawing of the central electrogram is from right to left in the embodiment).
2. And converting the electrocardiosignals acquired each time into standard electrocardio voltage signal values according to an electrocardio format protocol. The signal values are recorded in a buffer array SBuffArray, wherein the buffer array for interface rendering is divided into a vertical coordinate part (YBuffArray) and a horizontal coordinate part (XBuffArray).
2-1. the storage method of YBuffarray: when a new signal array is added into a drawing buffer area, firstly calculating a corresponding interface pixel ordinate of a signal value of the signal and adding the interface pixel ordinate into a YBuffarray, and removing the members exceeding the signal value when the length of the YBuffarray is greater than the maximum signal number;
the storage method of the XBuffArray comprises the following situations:
(1) when the original SBuffarray signal number is 0, the abscissa of the new signal is the value of the (Smax-number of new signals + position of new signal in new signal array) th member in XArray, and the value is put into XBuffarray;
(2) when the number of the original SBuffarray signals is greater than 0 and does not exceed the maximum number of signals drawable in an electrocardiogram interface window, the value of each signal member corresponding to the original XBuffarray is the value of the member (Smax-number of the original XBuffarray member + position of the original signal in the original XBuffarray) in XArray, the abscissa of the new signal is the value of the member (number of the maximum signal-number of the new signal + position of the new signal in the new signal array) in XArray, and the new signal is added into the XBuffarray;
(3) when the number of original SBuffArray signals is greater than Smax, the value of the nth member of the XBuffArray is the value of the nth member in XArray.
It can be seen from the above calculation method of the abscissa and ordinate that only the ordinate value corresponding to the newly added signal needs to be calculated every time of refreshing, the ordinate value of the signal of the original buffer area does not need to be recalculated, and the abscissa values of all the signals only need to obtain the values of the corresponding positions in XArray.
Through the mode, the invention provides a brand-new electrocardiogram drawing method, so that the electrocardiosignals continuously extend from one side of the drawing area to the other side, and the aims of reducing the calculation time of the horizontal and vertical coordinates of the electrocardiosignals, ensuring the continuity of obtaining the electrocardiosignals and facilitating the real-time obtaining of the electrocardiosignals are fulfilled.
While the foregoing is directed to the preferred embodiment of the low latency electrocardiographic method disclosed herein, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. A low-delay electrocardiogram drawing method is characterized by comprising the following drawing steps:
(1) pre-calculating horizontal coordinates corresponding to all points in the drawing area;
(2) acquiring and recording electrocardiosignals;
(3) when the next electrocardiosignal is obtained, horizontally translating the signal in the step (2), simultaneously calculating the vertical coordinate of the newly added signal, and mapping the horizontal coordinate;
(4) repeating the step (2) and the step (3) until the electrocardiosignal acquisition is stopped.
2. The method for low-latency electrocardiographic rendering according to claim 1, wherein in step (1), the pixel interval between two signals is determined according to the signal sampling frequency of the electrocardiographic acquisition device, the maximum number Smax of signals that can be rendered by an electrocardiographic rendering interface is calculated according to the maximum number of pixels of the interface, the abscissa corresponding to each signal is calculated, the set of abscissas is recorded into an array XArray, and the first element in the array is the abscissa of the leftmost signal point of the interface, and the last element in the array is the abscissa of the rightmost signal point of the interface.
3. The method of claim 1 wherein step (2) converts the electrocardiographic signals acquired each time into standard electrocardiographic voltage signal values according to the electrocardiographic format protocol. The signal values are recorded in the buffer array SBuffarray.
4. The method for low-latency electrocardiographic rendering according to claim 1, wherein in each signal rendering in step (3), the signal coordinate queue obtained by the last rendering is fully utilized, and the signal rendered last is horizontally translated by a vertical coordinate invariant and horizontal coordinate mapping method, and the vertical coordinate of the newly added signal is calculated.
5. The low-latency electrocardiographic rendering method according to claim 1, wherein the electrocardiographic signals obtained in the steps (2) and (3) are displayed based on a rendering mode of an OpenGL ES high-performance graphics interface.
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| JPS63147244A (en) * | 1986-12-10 | 1988-06-20 | Fujitsu Ltd | Picture memory circuit |
| US5945972A (en) * | 1995-11-30 | 1999-08-31 | Kabushiki Kaisha Toshiba | Display device |
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