Novel wound surface area acquisition method based on body surface marker combined with image digital processing

Abstract

The invention discloses a novel wound surface area acquisition method based on body surface markers in combination with image digital processing, and relates to the technical field of image processing. Comprising the steps of obtaining a target wound image containing body surface markers, measuring the connecting line distance between the body surface markers, preprocessing the collected target wound image, obtaining a processed image, marking the projection distance of the axis between the body surface markers in the processed image in the image, and determining the projection area of the target wound in the image. And determining a target wound surface area based on the connecting line distance, the projection distance and the projection area. According to the method, the area and the change condition of the target wound surface during clinical operation can be accurately calculated and obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of image processing, and particularly relates to a novel method for obtaining wound area based on body surface markers combined with digital image processing. Background Art

[0002] At present, the methods for doctors to evaluate limb wounds in clinical work are mainly as follows: Method 1, traditional nine-point method for body surface area and palm method. Method 2: Measuring the length, width and other data of specific wounds through actual measuring tools, and then performing area conversion. Method 3: Using a shooting terminal or other large and complex equipment systems to shoot the wound and the measuring tools around the wound, establishing a scale to obtain a picture with a scale, and then performing wound area conversion.

[0003] However, the above methods all have deficiencies:

[0004] Method 1: Usually estimated by visual inspection or converted through the patient's palm area, there are large errors, which cannot meet the requirements of area conversion in centimeters and microns, and cannot meet the current requirements of scientific research for rigor and refinement;

[0005] Method 2: It is the main measurement method in clinical practice. Disadvantages: 1. The wound and the wound opening are open (acute or chronic), sometimes complicated with infections and the presence of other pathogenic bacteria and viruses. The patient's body fluids and the carried pathogenic bacteria and viruses are easy to contaminate the measuring tools with each other, and even the risk of nosocomial cross-infection may be increased when measuring multiple patients, that is, the risk of nosocomial infection. Especially during the operation, in order to ensure aseptic operation, only traditional sterilized measuring tools can be used to draw and measure narrow wounds and irregular wounds. Due to storage factors and the complexity of irregular figure conversion, error data are easily obtained and cannot be calibrated after the operation, such as large-area infected wounds and large-area burn wounds. 2. When measuring large-area wounds, irregular wounds, or even wounds combined with acute active bleeding, due to the actual scale limitation of the measuring tools, the measured values cannot be obtained effectively, quickly and accurately, such as lower limb skin and soft tissue avulsion injury caused by car accidents and various acute wounds.

[0006] Method 3: It is a relatively accurate method for calculating wounds in current clinical and scientific research work. Disadvantages: 1. The picture only has two-dimensional plane attributes, and errors may be obtained due to the change of the shooting plane angle of the terminal held by the shooting personnel. 2. Clinical work is special, mainly aiming at the cure of patients. It is not suitable to carry large, expensive, complex and special equipment for timely shooting and measurement. Usually, a portable general shooting mobile phone is used for shooting. In actual work, if the measuring tool is not carried with you to establish a scale, invalid pictures with large errors may be obtained, so the objective scene of the wound and the wound surface at the time of shooting cannot be perfectly restored, and accurate data cannot be obtained.

[0007] Clinical work takes the safety and cure of patients as the first consideration principle, which is affected by multiple factors such as cross-infection, aseptic operation, and the duration of invasive operation. Therefore, it leads to the lag in the digital processing of clinical wound and wound surface image data. In view of this characteristic, clinical and research staff related to wounds and wounds urgently need a technical method with universality, simplicity, science, speed, economy, and practicability to accurately draw and measure biological wounds and wounds.

[0008] Therefore, how to provide a new method for obtaining wound area based on body surface markers combined with image digital processing to solve the difficulties existing in the prior art is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0009] In view of this, the present invention provides a new method for obtaining wound area based on body surface markers combined with image digital processing, which can accurately calculate and obtain the area and change of the target wound during clinical operation.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A new method for obtaining wound area based on body surface markers combined with image digital processing includes the following steps:

[0012] S1. Obtain a target wound image containing body surface markers;

[0013] S2. Measure the connection distance between body surface markers;

[0014] S3. Preprocess the collected target wound image to obtain a processed image;

[0015] S4. Mark the projection distance of the axis between body surface markers in the processed image within the picture to determine the projection area of the target wound within the image;

[0016] S5. Determine the target wound area based on the connection distance, projection distance, and projection area.

[0017] In the above method, optionally, the selected body surface markers in S1 include:

[0018] The body surface markers can be clearly visible and specifically located in the image photo at the same time;

[0019] The body surface markers are anatomical structures or features that can be clearly recognized and touched on the human body surface.

[0020] In the above method, optionally, when taking the target wound image in S1, the shooting tool is used to shoot parallel to the target wound.

[0021] In the above method, optionally, the preprocessing of the image in S3 includes: adjusting the hue, saturation, and brightness of the acquired target wound image to improve the contrast and recognition of the image.

[0022] In the above method, optionally, determining the projected area in S4 includes: circumscribing the wound boundary based on the pathological characteristics of the wound.

[0023] In the above method, optionally, S5 includes: determining the physical size of the image based on the connection distance, determining the number of pixels of the connection line of the selected body surface landmark points in the picture based on the projection distance, establishing a scale ratio based on the physical size and the number of pixels, determining the number of pixel points within the wound boundary, and determining the target wound area in combination with the scale ratio.

[0024] As can be seen from the above technical solutions, compared with the prior art, the present invention provides a new method for obtaining the wound area based on body surface markers combined with image digital processing, having the following beneficial effects: 1) The present invention can eliminate the need to measure the vertical distance value between the camera and the target wound and related steps; at the same time, by combining the camera mask image to balance the camera shooting position, computer vision, and deep neural network learning system, a more accurate wound area value can be obtained; 2) The present invention ensures that medical staff can treat patients in a timely manner. In the case of no measuring tools and the photographer not meeting the shooting technical requirements, the area and changes of the target wound during clinical operation can be accurately calculated again based on the pictures in the mobile phone afterwards; 3) The present invention accurately calculates the specific data of the burn area at all levels within the same wound according to the pathological appearance colors of first-degree, second-degree, and third-degree burn wounds, and converts the pictures of the wounds retained by medical staff, which have no research value due to the absence of measuring tools in the pictures, into specific values again through this method, turning waste into treasure for scientific research. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0026] Figure 1 It is a flowchart of a new method for obtaining the wound area based on body surface markers combined with image digital processing disclosed by the present invention;

[0027] Figure 2a It is a diagram of the selected body surface markers disclosed by the present invention;

[0028] Figure 2b It is a diagram for determining the projection distance of the body surface markers disclosed in the embodiments of the present invention;

[0029] Figure 2c It is a diagram for determining the scale of the ruler disclosed in the embodiments of the present invention;

[0030] Figure 2d It is a diagram for selecting the target wound area disclosed in the embodiments of the present invention;

[0031] Figure 2e It is a diagram of the pre - processed target wound in the embodiments of the present invention;

[0032] Figure 2f It is a diagram for determining the area of the target wound disclosed in the embodiments of the present invention;

[0033] Figure 2g It is a diagram of the exposed bone area within the wound in the embodiments of the present invention. Detailed implementation manners

[0034] Next, with reference to the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Refer to Figure 1 As shown, the present invention discloses a new method for obtaining the wound area based on body surface markers combined with image digital processing, including the following steps:

[0036] S1. Obtain a target wound image containing body surface markers;

[0037] S2. Measure the connection distance between body surface markers;

[0038] S3. Pre - process the collected target wound image to obtain a processed image;

[0039] S4. Mark the projection distance of the axis between body surface markers in the processed image within the picture to determine the projected area of the target wound in the image;

[0040] S5. Determine the target wound area based on the connection distance, projection distance, and projected area.

[0041] Further, the selected body surface markers in S1 include:

[0042] Select the body surface markers in the adjacent time periods before and after shooting. The adjacent time period refers to the time when the human body markers will not change with the extension of time. The body surface marker points selected on the same human body within a certain time will not change or develop with time. This time is a relative constant with respect to the disease course healing time;

[0043] The body surface markers can be clearly visible and specifically located in the image photo at the same time, and measuring the marker points will not affect the treatment of the wound or incision;

[0044] The body surface markers are anatomical structures or features that can be clearly recognized and felt on the human body surface; for example: both sides of the nail bed of the same finger are two body surface marker points of the human body, the distance from the joint skin crease to the tip of the limb is two body surface marker points of the human body, the ulnar or radial side or diameter of the limb, the skin at the bone prominence, moles, scars, etc.;

[0045] The selected body surface marker points of the human body need to have a visual color difference from the surrounding tissues for the shooting tool and the naked eye to identify and judge. The closer the connecting line distance between the two selected body surface marker points is to the maximum diameter of the wound surface, the smaller the area error obtained finally.

[0046] Furthermore, multiple body surface marker points can be selected in the picture to form multiple different axes, and the target wound area is calculated by converting the different connecting line distances. The more the number of connecting lines, the more accurate the average value data of the wound area finally obtained.

[0047] Furthermore, in S1, when shooting the target wound surface image, the shooting tool is used to shoot parallel to the target wound surface.

[0048] Specifically, when the shooting tool shoots the target wound surface, it needs to be parallel to the wound surface. Since the wound surface is at least parallel to one of the limb axes (vertical axis, sagittal axis, coronal axis), the position of the shooting tool can be adjusted with reference to this limb axis to take a parallel photo of the target wound surface.

[0049] Furthermore, the image shooting conditions include:

[0050] Visible light is required during shooting to display the target wound surface, fix the patient's body position and the corresponding joint angles, and keep the limb still;

[0051] Use the shooting tool to focus on shooting the limb wound and incision to obtain a clear image, which can be at any distance, but the image needs to be clear;

[0052] The shooting lens needs to carry the body surface marker points of the limb that are clearly on the same plane as the wound surface, and both the target wound surface and the two selected body surface marker points must be visible in the obtained image.

[0053] Specifically, the shooting tool can be selected as a mobile phone.

[0054] Furthermore, in S3, the preprocessing of the image includes: adjusting the hue, saturation and brightness of the acquired target wound surface image to improve the contrast and recognition of the image.

[0055] Furthermore, in S4, determining the projected area includes: delineating the wound surface boundary based on the pathological characteristics of the wound surface.

[0056] Specifically, the color characteristics of the pathological appearance at the boundary between the wound surface and normal skin: the lack of normal skin tissue, bright red fresh granulation, dark red congestion, grayish-white necrotic tissue, and yellowish-brown exudate within the wound surface. Based on the color characteristics, brightness characteristics, spatial characteristics, and texture similarity characteristics of the target wound surface in the image, the target wound surface is delineated.

[0057] Further, S5 includes: determining the physical size of the image based on the connection distance, determining the number of pixels of the connection line of the selected body surface landmark points within the picture based on the projection distance, establishing a scale ratio based on the physical size and the number of pixels, determining the number of pixel points within the wound surface boundary (similar to the integral principle), and determining the area of the target wound surface in combination with the scale ratio.

[0058] In a specific embodiment, refer to Figure 2a - Figure 2g as shown in

[0059] S1. Fix the patient's limb in a visible light environment, select the left medial malleolus and lateral malleolus as body surface landmarks, and take a target wound surface image including the body surface landmarks;

[0060] S2. Measure the connection distance from the left medial malleolus to the lateral malleolus, and the measured physical length is 8 cm;

[0061] S3. Preprocess the acquired target wound surface image, enlarge the picture, and accurately correct the wound surface area according to the wound surface characteristics in the picture to obtain the processed image;

[0062] S4. Mark the projection distance of the axis between the body surface landmarks in the processed image within the picture as 432 pixels, delineate the wound surface area according to the wound surface characteristics in the picture, and count the projected area within the delineated wound surface;

[0063] S5. Establish a scale ratio based on the connection distance and the projection distance, and after proportional conversion based on the scale ratio and the projected area, the wound surface area is 85.71 cm 2 ; count the number of pixels of the bone exposure area within the delineated wound surface, and after proportional conversion, the bone exposure area is 19.98 cm 2 .

[0064] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A novel method for obtaining the area of a wound based on the combination of body surface markers and digital image processing, characterized in that, Including the following steps: S1. Obtain a target wound image containing body surface markers; S2. Measure the connection distance between body surface markers; S3. Preprocess the collected target wound image to obtain a processed image; S4. Mark the projection distance of the axis between body surface markers in the processed image within the picture, and determine the projection area of the target wound within the image; S5. Determine the target wound area based on the connection distance, projection distance, and projection area.

2. The novel method for obtaining wound area based on body surface marker combined with image digital processing according to claim 1, wherein The selected body surface markers in S1 include: The body surface markers can be clearly visible and specifically located in the image photo at the same time; The body surface markers are anatomical structures or features that can be clearly recognized and touched on the human body surface.

3. The novel method for obtaining wound area based on body surface marker combined with image digital processing according to claim 1, wherein In S1, the target wound image is taken with a photographing tool parallel to the target wound.

4. The novel method for obtaining wound area based on body surface marker combined with image digital processing according to claim 1, wherein The preprocessing of the image in S3 includes: adjusting the hue, saturation, and brightness of the collected target wound image to improve the contrast and recognition of the image.

5. The novel method for obtaining wound area based on body surface marker combined with image digital processing according to claim 1, wherein Determining the projection area in S4 includes: delineating the wound boundary based on the pathological characteristics of the wound.

6. The novel method for obtaining wound area based on body surface marker combined with image digital processing according to claim 5, wherein S5 includes: determining the physical size of the image based on the connection distance, determining the number of pixels of the connection line of the selected body surface marker points within the picture based on the projection distance, establishing a scale ratio based on the physical size and the number of pixels, determining the number of pixel points within the wound boundary, and determining the target wound area in combination with the scale ratio.

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