CN106960461A - Infant cranium method for three-dimensional measurement based on deformable model - Google Patents

Infant cranium method for three-dimensional measurement based on deformable model Download PDF

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CN106960461A
CN106960461A CN201610012146.7A CN201610012146A CN106960461A CN 106960461 A CN106960461 A CN 106960461A CN 201610012146 A CN201610012146 A CN 201610012146A CN 106960461 A CN106960461 A CN 106960461A
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head
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infant cranium
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王冰
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Shanghai Dolby Ru Yi Medical Technology Co Ltd
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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
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
    • A61B5/1077—Measuring of profiles
    • A61B5/1078—Measuring of profiles by moulding
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T15/00—3D [Three Dimensional] image rendering
    • G06T15/005—General purpose rendering architectures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10004—Still image; Photographic image
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10024—Color image

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  • Oral & Maxillofacial Surgery (AREA)
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  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
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Abstract

A kind of infant cranium method for three-dimensional measurement based on deformable model, system hardware platform is built using camera, video line, video frequency collection card, computer, the surface for being placed on infant cranium using a camera is shot vertically downward, collection is per color image frame, using the profile of head on deformable two-dimensional curves fitted figure picture, head parameter is calculated according to two-dimensional curve data.The surface for being placed on infant cranium using a camera first is shot to head vertically downward, collection is per color image frame, according to the R, G of collection current frame image, B component value extracts head, and the edge contour of head on current frame image is detected using image Segmentation Technology.Then the edge contour of head on current frame image is fitted using deformable two-dimensional curves using curve fitting technique, the parameter and centre coordinate of each two-dimensional curve is obtained.Head width, length, catercorner length, head circumference and head ratio are calculated finally according to two-dimensional curve data.The three-dimension measuring system can be measured to various infant craniums.

Description

Infant cranium method for three-dimensional measurement based on deformable model
Technical field
The present invention relates to a kind of infant cranium method for three-dimensional measurement based on deformable model, for perceiving interface, the application field such as medical analysis and virtual reality, has actual application value in terms of medical image, biomedicine, Head recognition, video conference, video-game, material deformation, compression of images.Belong to computer vision and field of Computer Graphics.
Background technology
Rising star's laser scanning measurement instrument (STARSCANNER) is a kind of laser data acquisition system (LASER DATA ACQUISITION SYSTEM) in Nikkei Food and Drug Administration (FDA) approval listing July 3 in 2001.Its purposes accurately obtains the data of child's capitiform quick.Assess the situation of capitiform growth according to this, assist clinical diagnosis, and then with this data, utilize CAD/CAM technologies (computer design/manufacture) the customization correction helmet.In Europe, Mei Deng states, existing millions of infant is successfully early had found using this high-tech, disease in terms of early diagnosis skull, early diagnosis and treatment, curative effect is determined, European and American developed countries and South Korea are spread at present, Singapore, the local communities medical centre aspect such as Taiwan.
Many basic research have been done by domestic each colleges and universities, have delivered many papers.Li Haiyan etc. utilizes live body human head CT images, segmentation and binaryzation, edge repair are carried out to image by self-compiling program, removed after the processing such as interference, image correcting error and edge extracting, witness mark is determined, the accurate measurement to os prefrontale, parietal bone and occipital bone thickness is realized.This method can both realize the measurement to diverse location in a width skull bone CT image, can also realize the automatic measurement to same position in multiple image.Li Haiyan etc. proposes two kinds of skull symmetry evaluation algorithms, using live body human head CT images, image is carried out after the processing such as segmentation and binaryzation, image correcting error, edge extracting by self-compiling program, realizes the quantitative measurment of skull symmetry.Thank to China and wait CT images for two kinds of form live body human heads of JPEG and DICOM, skull geometric properties are enclosed etc. to os prefrontale, parietal bone and occipital bone thickness and the head breadth, a long, head circumference and cranium using self-editing Matlab programs and carry out high-volume accurate measurement.Zhou Zhizun etc. describes the several method used when being measured to skull, illustrates the test principle and e measurement technology means of every kind of method, and several measuring methods are compared.There is provided a set of quick, convenient, science acquisition means of accurate human organ spatial parameters and MATLAB 3 Dimension Image Techniques.Liu Xiaojing etc. is according to patient's skull CT scanning data, using RP technique, builds Three-dimensional model, evaluates application value of the model surgery based on skull model in Craniofacial anomalies diagnoses and treatment.Du Fangfang etc. realizes the reconstruction of skull surface skin using the MC algorithms of CT 3-dimensional reconstructions.Ke Tao describes the method that three-dimensional reconstruction is carried out to human skull using the theory and structure light three-dimensional sequences image of digital photogrammetry based on photogrammetric Theory.Research contents includes：Camera calibration, texture lack clarification of objective point correspondence, is directly solved using relative orientation and carries out relative orientation, the piecemeal network forming of model and the connection of stereogram, structure, the texture mapping of Delaunay triangulation network based on constraints etc..Guo Fuqiang obtains data using skull model as research object using coded structured light, first projects one group of vertical striped, then projects one group of orthogonal to that striped, obtains modulation image using two video cameras, according to binocular stereo vision principle, realizes the reconstruction of spatial point.Liu Guizhen obtains the D coordinates value of skull image, carries out resurfacing to the section of two-dimentional skull using iso-surface patch algorithm, important information is extracted using wavelet transformation, select a kind of suitable classifying identification method that Cranial features are identified.Qu Dewei sets up the three-dimensional image of a set of normal crinial bone and display system and different angles observations and can measure the various boundary values of each structure, to quantify all structures of skull.Including：Image coordinate correction (contraposition), the processing of two dimensional image, the extraction to intending stereo reconstruction structural edge, the border of ready-built structure carried out two-parameter spline interpolation, calculate rebuild structural edge contour line convex closure, adjacent sections structural edge contour line connected using the method for " cover tile piece ", the 3 D stereo of reconstruction structure is shown.
The content of the invention
It is an object of the invention to for the excessive deficiency of model parameter in infant cranium three-dimensional measurement, propose a kind of method that use deformable two-dimensional curves measure infant cranium three-dimensional parameter in the picture, this method only needs to a camera and can be carried out infant cranium three-dimensional measurement, reduce infant cranium measurement cost, it is adaptable to the measurement of various targets.
To realize such purpose, in technical scheme, build system hardware platform, the surface for being placed on infant cranium using a camera is shot to infant cranium vertically downward, collection is per color image frame, using the profile of infant cranium on deformable two-dimensional curves fitted figure picture, the measurement of three-dimensional dimension is carried out according to distance between key point in the parameter and curve of two-dimensional curve.System hardware platform is built using camera, video line, video frequency collection card, computer first, the surface for being placed on infant cranium using a camera is shot to infant cranium vertically downward, collection is per color image frame, according to the R of collection current frame image, G, B component value extracts the number of people, and the infant cranium edge contour on current frame image is detected using image Segmentation Technology.Then the edge contour of infant cranium on current frame image is fitted using deformable two-dimensional curves using curve fitting technique, obtain the parameter and centre coordinate of each two-dimensional curve, some key points on two-dimensional curve are selected, head width, length, catercorner length are calculated according to these key point positions.Finally calculate and obtain head circumference and head ratio.
The infant cranium method for three-dimensional measurement of the present invention specifically includes following steps：
1. the design on hardware and software of infant cranium three-dimension measuring system
The hardware platform of infant cranium three-dimension measuring system is built using camera, video line, video frequency collection card, computer, Software for producing interface, the interface can show the image of infant cranium.Also the hardware platform of infant cranium three-dimension measuring system can be built using camera, video line, DSP video development plates.Software programming is carried out using step 2-5 method by infant cranium three-dimension measuring system flow chart.
2. the infant cranium edge contour on current frame image is detected using image Segmentation Technology
The surface for being placed on infant cranium using a camera is shot to infant cranium vertically downward, and collection is per color image frame, and the current frame image I (x, y, i) of collection R, G, B component are respectively IR(x, y, i), IG(x,y,i),IB(x, y, i), is both less than 60 by R, G, B three-component value and the absolute value that mutually subtracts each other of three-component is both less than 25 pixel extraction and obtains number of people image TIL, number of people image TI is eliminated using morphology operations (such as corrosion and expansion)LIn isolated point and part Small object region.
3. the profile of head on current frame image is fitted using deformable two-dimensional curves
The edge contour of infant cranium on current frame image is detected using image Segmentation Technology (such as Canny boundary operators), the edge contour of infant cranium on current frame image is fitted using deformable two-dimensional curves using curve fitting technique, parameter k, a, b of two-dimensional curve are obtained, the curve of number of people parameter size will not met and its target area at place is eliminated.Obtain two-dimensional curve centre coordinate (x0,y0)。
4. calculate head width, length, catercorner length according to two-dimensional curve data
The distance between two intersection points that two-dimensional curve intersects with X-axis are calculated, the distance is the length on head.The distance between two intersection points that two-dimensional curve intersects with Y-axis are calculated, the distance is the width on head.Two-dimensional curve is calculated with being the distance between 45 degree two intersection points of straight line intersection by origin and slope, the distance is head catercorner length.Two-dimensional curve is calculated with being the distance between 135 degree two intersection points of straight line intersection by origin and slope, the distance is head catercorner length.
5. calculate head circumference and head ratio
Calculate the girth of two-dimensional curve, the Zhou Changwei head circumferences.The ratio between head width, length and catercorner length is calculated, the ratio is head ratio.
The inventive method is simple, and it is easy to realize.The two-dimensional curve of foundation can reflect the shape of infant cranium exactly.The inventive method is suitable for variously-shaped target detection.Experiment is using video frequency pick-up head gathered data that is cheap, easily installing, it is not necessary to which optional equipment, the method for extracting, calculating infant cranium parameter is simple, has the advantages that real-time, noncontact.
Brief description of the drawings
Fig. 1 is the schematic diagram of a scenario that camera shoots infant cranium.
In Fig. 1, a camera is placed on the surface of infant cranium, towards lower shooting infant cranium.
Fig. 2 is the flow chart of infant cranium three-dimension measuring system of the present invention.
In Fig. 2, system operation is by IMAQ, head detection, rim detection, deformable two-dimensional curves fitting, calculating head width length and catercorner length, calculating head circumference head 6 steps of ratio.
Fig. 3 is head detection, head contours extract, the experimental result of curve matching in image.
In Fig. 3, (a) it is camera is shot directly over infant cranium image, (b) it is head testing result corresponding with (a) image, (c) it is head edge contour testing result corresponding with (b) image, (d) corresponds to the deformable two-dimensional curves fitting result of (c).
Fig. 4 is deformable two-dimensional curves.
In Fig. 4, the curve is determined by five parameters：Center position coordinates (x0,y0)、k、a、b。
Embodiment
Technical scheme for a better understanding of the present invention, is described in further detail below in conjunction with drawings and Examples.Embodiment carries out the description of infant cranium three-dimensional measurement process specific to accompanying drawing 2,3,4.
1. the design on hardware and software of infant cranium three-dimension measuring system
The hardware platform of infant cranium three-dimension measuring system is built using camera, video line, video frequency collection card, computer, photographed scene is as shown in Figure 1.Also the hardware platform of infant cranium three-dimension measuring system can be built using camera, video line, DSP video developments plate (such as DM6437CPU plates).Software programming is carried out using step 2-5 method by infant cranium three-dimension measuring system flow in Fig. 2.
2. the surface for being placed on infant cranium using a camera is shot to infant cranium vertically downward, collection is per color image frame, and collection current frame image I (x, y, i) R, G, B component are respectively IR(x, y, i), IG(x,y,i),IB(x, y, i), is both less than 60 by R, G, B three-component value and the absolute value that mutually subtracts each other of three-component is both less than 25 pixel extraction and obtains head image TIL：
Head image TILShown in testing result such as Fig. 3 (b).Number of people image TI is eliminated using morphology operations (such as corrosion and expansion)LIn isolated point and part Small object region.
3. extracting the edge contour of infant cranium on current frame image using image Segmentation Technology (such as Canny boundary operators), edge detection results corresponding with Fig. 3 (b) are obtained, shown in such as Fig. 3 (c).
Deformable two-dimensional curves equation is：Wherein | k | ＜ 1, as shown in Figure 4.The edge contour of infant cranium on current frame image is fitted using the deformable two-dimensional curves for meeting above-mentioned equation using curve fitting technique, as shown in Figure 4.Parameter k, a, b of two-dimensional curve are obtained, the two-dimensional curve of infant cranium parameter size will not met and its target area at place is eliminated.Two-dimensional curve centre coordinate expression formula is：
Two-dimensional curve centre coordinate (x is obtained by above-mentioned expression formula0,y0)。
4. apart from d between calculating two intersection points that two-dimensional curve intersects with X-axis1Computing formula be：
d1=2a/ (1-k2)
The length d on head is obtained by above-mentioned computing formula1。
Apart from d between two intersection points that two-dimensional curve intersects with Y-axis2Computing formula be：
d2=2b
The width d on head is obtained by above-mentioned computing formula2。
By k, a, b, x=r1Cos45 °, y=r1Sin45 °, x=r2Cos225 °, y=r2Sin225 ° substitutes into two-dimensional curve equation and obtains r respectively1、r2, obtain a catercorner length d of head3=r1+r2。
By k, a, b, x=r3Cos135 °, y=r3Sin135 °, x=r4Cos315 °, y=r4Sin315 ° substitutes into two-dimensional curve equation and obtains r respectively3、r4, obtain another catercorner length d of head4=r3+r4。
5. calculate the girth d of two-dimensional curve, the Zhou Changwei head circumferences.
The computing formula of ratio between head width, length and catercorner length is：
L1=d1/d2 L2=d1/d3 L3=d2/d3 L4=d1/d4 L5=d2/d4
Ratio L1、L2、L3、L4、L5For head scale parameter.

Claims (1)

1. a kind of infant cranium method for three-dimensional measurement based on deformable model, it is characterised in that including following specific step Suddenly：
1) baby is built using camera, video line, video frequency collection card, computer (or DSP video developments plate) The hardware platform of head three-dimension measuring system, Software for producing interface.By infant cranium three-dimension measuring system stream The step of journey figure, carries out software programming；
2) surface for being placed on infant cranium using a camera is shot to infant cranium vertically downward, is adopted Collection is per color image frame, and according to the R of collection current frame image, G, B component value extracts head region.Using Morphology operations eliminate isolated point and part Small object region in head image；
3) edge contour of the infant cranium on current frame image is detected using image Segmentation Technology, using curve matching Technology is fitted the edge contour of infant cranium on current frame image using deformable two-dimensional curves, obtains each The parameter and centre coordinate of two-dimensional curve, by the curve and its target at place that do not meet number of people parameter size Region is eliminated；
4) the distance between two intersection points that two-dimensional curve intersects with X-axis and Y-axis are calculated, the distance is the length on head Degree and width.Calculate two-dimensional curve with by straight line intersection that origin and slope are 45 degree and 135 degree The distance between two intersection points, the distance is head catercorner length；
5) girth of two-dimensional curve, the Zhou Changwei head circumferences are calculated.Calculate head width, length and catercorner length it Between ratio, the ratio be head ratio.
CN201610012146.7A 2016-01-08 2016-01-08 Infant cranium method for three-dimensional measurement based on deformable model Pending CN106960461A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108205609A (en) * 2018-01-02 2018-06-26 深圳市晨宇科技有限公司 Custom Prosthesis skull corrects the manufacturing method of the helmet
CN111862048A (en) * 2020-07-22 2020-10-30 浙大城市学院 Automatic fish posture and length analysis method based on key point detection and deep convolution neural network
US20210004957A1 (en) * 2018-03-26 2021-01-07 Pediametrix Inc. Systems and methods of measuring the body based on image analysis
CN113040751A (en) * 2021-03-12 2021-06-29 国家康复辅具研究中心 Measuring method for customized orthopedic helmet and obtained orthopedic helmet
CN113131399A (en) * 2021-05-27 2021-07-16 国网河北省电力有限公司保定供电分公司 Aiming cutting method and aiming cutting system
CN113270172A (en) * 2021-03-31 2021-08-17 正雅齿科科技(上海)有限公司 Method and system for constructing contour line in lateral skull slice
US12033316B2 (en) * 2019-03-25 2024-07-09 Pediametrix Inc. Systems and methods of measuring the body based on image analysis

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108205609A (en) * 2018-01-02 2018-06-26 深圳市晨宇科技有限公司 Custom Prosthesis skull corrects the manufacturing method of the helmet
US20210004957A1 (en) * 2018-03-26 2021-01-07 Pediametrix Inc. Systems and methods of measuring the body based on image analysis
US12033316B2 (en) * 2019-03-25 2024-07-09 Pediametrix Inc. Systems and methods of measuring the body based on image analysis
CN111862048A (en) * 2020-07-22 2020-10-30 浙大城市学院 Automatic fish posture and length analysis method based on key point detection and deep convolution neural network
CN111862048B (en) * 2020-07-22 2021-01-29 浙大城市学院 Automatic fish posture and length analysis method based on key point detection and deep convolution neural network
CN113040751A (en) * 2021-03-12 2021-06-29 国家康复辅具研究中心 Measuring method for customized orthopedic helmet and obtained orthopedic helmet
CN113270172A (en) * 2021-03-31 2021-08-17 正雅齿科科技(上海)有限公司 Method and system for constructing contour line in lateral skull slice
CN113270172B (en) * 2021-03-31 2024-02-09 正雅齿科科技(上海)有限公司 Method and system for constructing contour lines in skull lateral position slice
CN113131399A (en) * 2021-05-27 2021-07-16 国网河北省电力有限公司保定供电分公司 Aiming cutting method and aiming cutting system

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Application publication date: 20170718