CN103077553A - Three-dimensional coordinate determination method and device - Google Patents
Three-dimensional coordinate determination method and device Download PDFInfo
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Abstract
The invention discloses a three-dimensional coordinate determination method and device. The method comprises the steps that a volume reconstruction image is obtained, wherein the volume reconstruction image is a two-dimensional image and comprises a three-dimensional object; two-dimensional coordinates of a first position and a second position in the volume reconstruction image are respectively obtained, wherein the first position and the second position are two different positions clicked by a user in the volume reconstruction image; and a first three-dimensional coordinate corresponding to the two-dimensional coordinates in the volume reconstruction image is determined. With the three-dimensional coordinate determination method and the device, the endpoints of a distance to be measured or the vertex of an angle to be measured can be directly selected in the volume reconstruction image, and the problem that a tangent plane reconstruction image needs to be adjusted for times when distance or angle measurement is carried out in the tangent plane reconstruction image is avoided, so that a better medical treatment observation effect is realized.
Description
Technical field
The present invention relates to medical field, in particular to a kind of definite method and device of three-dimensional coordinate.
Background technology
During clinical treatment is used, can carry out volume reconstruction to obtain the volume reconstruction image to many scan images, the three-dimensional information that comprises scanned object in the volume reconstruction image, when passing through volume reconstruction image viewing human anatomic structure, need to carry out space measurement to interested anatomical structure toward contact, be included in range observation, measurement of angle in the three dimensions.To the three-dimensional measurement of bone, in bone correction, plastic operation, has important value; To the three-dimensional measurement of organ and diseased region, in lesion resection, surgery planning, radiotherapy planning, has important value.But lack at present and a kind ofly be easy to use and the three-dimensional space measurement mode of accurate positioning.
In the prior art, usually adopt by repeatedly attempting and adjusting, find one to comprise the tangent plane reconstructed image apart from end points or angle summit that to measure, then carry out distance or measurement of angle.The searching and determine of suitable tangent plane reconstructed image, common difficulty relatively needs repeatedly to attempt and continuous artificial the adjustment, and is not only consuming time, and easily makes mistakes.
For in the prior art when medical treatment is observed the lower problem of efficient of measuring distance or angle, the present invention proposes a kind of method of directly in the volume reconstruction image, carrying out distance or measurement of angle.
Summary of the invention
The invention provides a kind of definite method and device of three-dimensional coordinate, to solve at least in the prior art the lower problem of efficient of when medical treatment is observed measuring distance or angle.
To achieve these goals, according to an aspect of the present invention, provide a kind of definite method of three-dimensional coordinate.
Definite method according to three-dimensional coordinate of the present invention comprises: obtain the volume reconstruction image, wherein, the volume reconstruction image is two dimensional image, and comprises three-dimensional object in the two dimensional image; Obtain respectively primary importance and the second place two-dimensional coordinate in the volume reconstruction image, wherein, primary importance and the second place are two diverse locations that the user clicks the volume reconstruction image; Determine the first three-dimensional coordinate of two-dimensional coordinate correspondence in the volume reconstruction image.
Further, obtain three-dimensional coordinate corresponding to two-dimensional coordinate and comprise: obtain default viewpoint and the three-dimensional system of coordinate take viewpoint as initial point, wherein, the volume reconstruction image is arranged in three-dimensional system of coordinate; Obtain the second three-dimensional coordinate of two-dimensional coordinate correspondence in three-dimensional system of coordinate; Obtain the gray-scale value of the point on the default ray, wherein, default ray passes the ray of point corresponding to the second three-dimensional coordinate for take initial point as starting point; Obtain the corresponding relation of gray-scale value and transparency; Obtain default transparency threshold value; Obtain the 3rd three-dimensional coordinate, wherein, presetting on the ray for first that the 3rd three-dimensional coordinate is corresponding, first is greater than the point of transparency threshold value along first transparency accumulated value on the direction of default ray; And determine that first the 3rd corresponding in three-dimensional system of coordinate three-dimensional coordinate is the first three-dimensional coordinate of two-dimensional coordinate correspondence in the volume reconstruction image.
Further, obtaining two-dimensional coordinate in the volume reconstruction image after corresponding the first three-dimensional coordinate, said method also comprises: determine distance between primary importance and the second place according to three-dimensional coordinate and the three-dimensional coordinate of the second place in the volume reconstruction image of primary importance in the volume reconstruction image.
Further, determine that the distance between primary importance and the second place comprises: obtain primary importance and the two-dimensional coordinate of the second place in the volume reconstruction image that the user selectes again; And definite primary importance of again selecting and the distance between the second place.
Further, obtaining respectively primary importance and the second place two-dimensional coordinate in the volume reconstruction image comprises: obtain respectively primary importance, the second place and the 3rd position two-dimensional coordinate in the volume reconstruction image that the user clicks, obtain two-dimensional coordinate in the volume reconstruction image after corresponding the first three-dimensional coordinate, said method also comprises: the size of determining the angle take the second place as the summit that primary importance, the second place and the 3rd position form according to primary importance, the second place and the 3rd position two-dimensional coordinate in the volume reconstruction image.
Further, after the first three-dimensional coordinate that obtains two-dimensional coordinate correspondence in the volume reconstruction image, said method also comprises: the common plane of determining primary importance and the second place according to the three-dimensional coordinate of the three-dimensional coordinate of primary importance and the second place, wherein, common plane is the plane at primary importance and second place place.
Further, determine that according to the three-dimensional coordinate of primary importance and the three-dimensional coordinate of the second place the common plane at primary importance and second place place comprises: the plane of determining the primary importance place; Judge and comprise whether the plane of primary importance comprises the second place; Determine to comprise that simultaneously the plane of primary importance and the second place is the common plane of primary importance and the second place.
To achieve these goals, according to another aspect of the present invention, provide a kind of definite device of three-dimensional coordinate, this device is used for carrying out definite method of any one three-dimensional coordinate provided by the invention.
A kind of definite device of three-dimensional coordinate is provided according to a further aspect in the invention.This device comprises: the first acquiring unit, be used for obtaining the volume reconstruction image, and wherein, the volume reconstruction image is two dimensional image, and comprises three-dimensional scanning object in the two dimensional image; Second acquisition unit is used for obtaining primary importance and the second place at the two-dimensional coordinate of volume reconstruction image respectively, and wherein, primary importance and the second place are two diverse locations that the user clicks the volume reconstruction image; And first determining unit, be used for determining three-dimensional coordinate corresponding to two-dimensional coordinate.
Further, second acquisition unit comprises: first obtains subelement, is used for obtaining default viewpoint and the three-dimensional system of coordinate take viewpoint as initial point, and wherein, the volume reconstruction image is arranged in three-dimensional system of coordinate; Second obtains subelement, is used for obtaining two-dimensional coordinate at the second three-dimensional coordinate corresponding to three-dimensional system of coordinate; The 3rd obtains subelement, is used for obtaining the gray-scale value of the point on the default ray, and wherein, default ray passes the ray of point corresponding to the second three-dimensional coordinate for take initial point as starting point; The 4th obtains subelement, is used for obtaining the corresponding relation of gray-scale value and transparency; The 5th obtains subelement, is used for obtaining default transparency threshold value; The 6th obtains subelement, is used for obtaining the 3rd three-dimensional coordinate, wherein, is presetting on the ray for first that the 3rd three-dimensional coordinate is corresponding, and first is greater than the point of transparency threshold value along first transparency accumulated value on the direction of default ray; And first determine subelement, is used for determining that be two-dimensional coordinate corresponding first three-dimensional coordinate in the volume reconstruction image at the 3rd three-dimensional coordinate corresponding to three-dimensional system of coordinate at first.
Further, said apparatus also comprises: the second determining unit is used for determining distance between primary importance and the second place according to primary importance at the three-dimensional coordinate of volume reconstruction image and the three-dimensional coordinate of the second place in the volume reconstruction image.
Further, the second determining unit comprises: the 7th obtains subelement, be used for obtaining the user again selected primary importance and the second place at the two-dimensional coordinate of volume reconstruction image; And second determine subelement, is used for determining again selected primary importance and the distance between the second place.
Further, second acquisition unit also is used for obtaining primary importance, the second place and the 3rd position that the user clicks, said apparatus also comprises: the 3rd determining unit, and for the size of determining the angle take the second place as the summit that primary importance, the second place and the 3rd position form.
Further, said apparatus also comprises: the 4th determining unit, be used for determining according to the three-dimensional coordinate of the three-dimensional coordinate of primary importance and the second place the common plane of primary importance and the second place, wherein, common plane is the plane at primary importance and second place place.
Further, the 4th determining unit comprises: the 3rd determines subelement, is used for determining the plane at primary importance place; Judgment sub-unit is used for judging comprising whether the plane of primary importance comprises the second place; The 4th determines subelement, is used for determining to comprise that simultaneously the plane of primary importance and the second place is the common plane of primary importance and the second place.
By the present invention, directly the problem of tangent plane reconstructed image position when having avoided carrying out distance or measurement of angle in the tangent plane reconstructed image, need to repeatedly be adjusted in the end points of the distance of selection needs measurement or the summit of angle in the volume reconstruction image.The method that adopts this invention to propose, can be with user's selected two-dimensional coordinate point in the volume reconstruction image, be converted to three-dimensional coordinate, thereby further measure two two-dimensional coordinate points that the user selectes in the volume reconstruction image, corresponding two three-dimensional coordinates, and the distance between them, or three two-dimensional coordinates are put corresponding three formed angles of three-dimensional coordinate, by the present invention, can measure efficiently distance or angle between several impact points, solve in the prior art efficient lower problem of when medical treatment is observed measuring distance or angle.
Description of drawings
The accompanying drawing that consists of the application's a part is used to provide a further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the structured flowchart according to definite device of the three-dimensional coordinate of the embodiment of the invention;
Fig. 2 is the process flow diagram according to definite method of the three-dimensional coordinate of the embodiment of the invention;
Fig. 3 a is the corresponding schematic diagram according to the image space of the embodiment of the invention and object space;
Fig. 3 b is the schematic diagram that concerns according to the two-dimensional coordinate of the embodiment of the invention and three-dimensional coordinate; And
Fig. 4 is the conversion schematic diagram according to the two-dimensional coordinate of the embodiment of the invention and three-dimensional coordinate.
Embodiment
Need to prove, in the situation that do not conflict, embodiment and the feature among the embodiment among the application can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
The embodiment of the invention provides a kind of definite device of three-dimensional coordinate, below definite device of three-dimensional coordinate that the embodiment of the invention is provided be introduced.
Fig. 1 is the structured flowchart according to definite device of the three-dimensional coordinate of the embodiment of the invention.
As shown in Figure 1, definite device of this three-dimensional coordinate comprises the first acquiring unit 11, second acquisition unit 12 and determining unit 13.
The first acquiring unit 11 is used for obtaining the volume reconstruction image, and wherein, the volume reconstruction image is two dimensional image, and comprises three-dimensional object in the two dimensional image.
Determining unit 13 is used for determining that two-dimensional coordinate is at the first three-dimensional coordinate corresponding to volume reconstruction image.
In the present embodiment, owing at first obtaining the three-dimensional coordinate of volume reconstruction image according to two-dimensional coordinate, and determine common plane according to three-dimensional coordinate, replace manual debugging and chosen altogether isoplanar operation, behind the three-dimensional coordinate that draws the position that the user selectes, can accurately and fast determine corresponding common plane by the mode that data are processed, therefore solved in the prior art in the prior art the lower problem of efficient of when medical treatment observe measuring distance or angle, so improved to organization of human body carry out apart from or the efficient of measurement of angle.
Hereinafter also mention the second three-dimensional coordinate, the first three-dimensional coordinate in the present embodiment only is used for two kinds of different observed patterns of expression with the second three-dimensional coordinate, the first three-dimensional coordinate and the second three-dimensional coordinate can be in the same coordinate system, also can be positioned at different coordinate systems.
The present embodiment realizes quick and precisely determining three-dimensional coordinate in the volume reconstruction image by the transparency threshold value, preferably, second acquisition unit comprises: first obtains subelement, be used for obtaining default viewpoint and the three-dimensional system of coordinate take viewpoint as initial point, wherein, the volume reconstruction image is arranged in three-dimensional system of coordinate; Second obtains subelement, is used for obtaining two-dimensional coordinate at the second three-dimensional coordinate corresponding to three-dimensional system of coordinate; The 3rd obtains subelement, is used for obtaining the gray-scale value of the point on the default ray, and wherein, default ray passes the ray of point corresponding to the second three-dimensional coordinate for take initial point as starting point; The 4th obtains subelement, is used for obtaining the corresponding relation of gray-scale value and transparency; The 5th obtains subelement, is used for obtaining default transparency threshold value; The 6th obtains subelement, is used for obtaining the 3rd three-dimensional coordinate, wherein, is presetting on the ray for first that the 3rd three-dimensional coordinate is corresponding, and first is greater than the point of transparency threshold value along first transparency accumulated value on the direction of default ray; And first determine subelement, is used for determining that be two-dimensional coordinate corresponding first three-dimensional coordinate in the volume reconstruction image at the 3rd three-dimensional coordinate corresponding to three-dimensional system of coordinate at first.
Three-dimensional coordinate can be used for calculating the distance between 2, preferably, said apparatus also comprises: the second determining unit is used for determining distance between primary importance and the second place according to primary importance at the three-dimensional coordinate of volume reconstruction image and the three-dimensional coordinate of the second place in the volume reconstruction image.
In the present embodiment, behind the position that changes certain selected point, can redefine the distance of point-to-point transmission, preferably, the second determining unit comprises: the 7th obtains subelement, be used for obtaining the user again selected primary importance and the second place at the two-dimensional coordinate of volume reconstruction image; And second determine subelement, is used for determining again selected primary importance and the distance between the second place.
Primary importance in the present embodiment only is used for distinguishing different positions with the second place, do not limit the data of selected point, namely, selected point can also be more than three or three, the below is take 3 as example, second acquisition unit also is used for obtaining primary importance, the second place and the 3rd position that the user clicks, and said apparatus also comprises: the 3rd determining unit, and for the size of determining the angle take the second place as the summit that primary importance, the second place and the 3rd position form.
In the prior art, need manually to adjust to determine common plane, the present embodiment can also be determined common plane, preferably, said apparatus also comprises: the 4th determining unit, be used for determining according to the three-dimensional coordinate of the three-dimensional coordinate of primary importance and the second place the common plane of primary importance and the second place, wherein, common plane is the plane at primary importance and second place place.
Particularly, the 4th determining unit comprises: the 3rd determines subelement, is used for determining the plane at primary importance place; Judgment sub-unit is used for judging comprising whether the plane of primary importance comprises the second place; The 4th determines subelement, is used for determining to comprise that simultaneously the plane of primary importance and the second place is the common plane of primary importance and the second place.
The embodiment of the invention also provides a kind of definite method of three-dimensional coordinate, and the method can be carried out based on above-mentioned device.
Fig. 2 is the process flow diagram according to definite method of the three-dimensional coordinate of the embodiment of the invention.
As shown in Figure 2, definite method of this three-dimensional coordinate comprises that following step S202 is to step S206.
Step S202 obtains the volume reconstruction image, and wherein, the volume reconstruction image is two dimensional image, and comprises three-dimensional object in the two dimensional image.The user can adjust the display mode of volume reconstruction image, comprises viewing angle, scaling, different tissues transparency.
The volume reconstruction image is the plane picture of two dimension, but this image can show the three-dimensional structure of object, carry out volume reconstruction by each tomographic sequence to scanning, can obtain the volume reconstruction image, for example, piece of bread is cut into sheet, a tension fault image of scanning is similar to a rusk so, the similar process that all rusk is reassembled into bread of the process of volume reconstruction, at last the bread that reconfigures is taken pictures, what take is the picture of a two dimension, but this picture may show the position relationship in the three dimensions, and the volume reconstruction image is similar to the picture of the bread in this example.
Step S204 obtains respectively primary importance and the second place two-dimensional coordinate in the volume reconstruction image, and wherein, primary importance and the second place are two diverse locations that the user clicks the volume reconstruction image.
The click location that the user is each, all two-dimensional coordinate i(x, a y in the corresponding volume reconstruction image), i(x, the y among following Fig. 3 b for example).
Step S206 determines two-dimensional coordinate corresponding first three-dimensional coordinate in the volume reconstruction image.
The first three-dimensional coordinate is the three-dimensional coordinate of point in three-dimensional system of coordinate in the volume reconstruction image, by the coordinate transformation method based on the ray cast algorithm, can convert the two-dimensional coordinate i (x, y) of volume reconstruction image to three-dimensional coordinate J(X, Y, Z).
Particularly, the ray cast algorithm is a kind of common method that generates the volume reconstruction image by two-dimentional tomoscan image.Its ultimate principle is, two-dimensional ct image with a series of continuous sweeps, at first reconstitute the three-dimensional volume data, then the point from the volume reconstructed image sends projection ray to the three-dimensional volume data, to ray the three-dimensional volume data point of process sample, and adopted value is carried out the mapping of transparency and color, carry out at last image synthetic, calculate color or the gray scale of each pixel in the volume reconstruction image, finally obtain the volume reconstruction image.
Fig. 3 a is the corresponding schematic diagram according to the image space of the embodiment of the invention and object space, shown in Fig. 3 a, the institute correspondence of the point with two-dimensional coordinate in the volume reconstruction image of two dimension have the point of three-dimensional coordinate in the object space, Fig. 3 b is the schematic diagram that concerns according to the two-dimensional coordinate of the embodiment of the invention and three-dimensional coordinate, shown in Fig. 3 b, emitted beam by the three dimensions of each pixel on the volume reconstruction image to the scanning object place, this ray and scanning object intersect at many points, these points are sampled point new on the three dimensions, for example, two-dimensional coordinate point i(x on the volume reconstruction image, y) corresponding object three-dimensional coordinate point J(X with it, Y, Z).Adopt " based on the coordinates transformation method of ray cast algorithm ", i (x, y) can be selected suitable reconstruct element, calculate the transmission equation of light, be converted to J (X, Y, Z).
Fig. 4 is the conversion schematic diagram according to the two-dimensional coordinate of the embodiment of the invention and three-dimensional coordinate, as shown in Figure 4, by this step, a selected observation station and with the true origin of this observation station as three-dimensional system of coordinate, the volume reconstruction image is arranged in this three-dimensional system of coordinate, two-dimensional coordinate i(x, y in the volume reconstruction image) coordinate in three dimensions is I(x, y, z).
Obtaining the first three-dimensional coordinate corresponding to this two-dimensional coordinate, be after the three-dimensional coordinate of the point in the volume reconstruction image, can also adopt process of iteration, determine the second three-dimensional coordinate of the some correspondence in the volume reconstruction image, i.e. the three-dimensional coordinate of the point in the corresponding three dimensions of point in the volume reconstruction image.Adopt following steps in the present embodiment:
The first, obtain default viewpoint and the three-dimensional system of coordinate take viewpoint as initial point, wherein, the volume reconstruction image is arranged in three-dimensional system of coordinate.
The second, obtain two-dimensional coordinate corresponding second three-dimensional coordinate in three-dimensional system of coordinate.
This three-dimensional coordinate is the coordinate of point in three-dimensional system of coordinate in the volume reconstruction image, for example the coordinate of ordering of the I among following Fig. 4.
The 3rd, obtain the gray-scale value of presetting the point on the ray, wherein, default ray passes the ray of point corresponding to the second three-dimensional coordinate for take initial point as starting point.
The 4th, obtain the corresponding relation of gray-scale value and transparency.
The 5th, obtain default transparency threshold value.
The 6th, obtain the 3rd three-dimensional coordinate, wherein, presetting on the ray for first that the 3rd three-dimensional coordinate is corresponding, first be along first transparency accumulated value on the direction of default ray greater than the point of transparency threshold value, for example, there is a successively in the direction along this ray on default ray, b, c and d 4 points, wherein, the transparency that a is ordered is that the transparency that 1, b is ordered is that the transparency that 2, c is ordered is 3, the transparency that d is ordered is 4, the transparency threshold value is that the transparency accumulated value that 5, c is ordered is 1+2+3=6, is the point of first transparency accumulated value greater than the transparency threshold value, therefore, the c point is the first point under this scene.
Still take following Fig. 4 as example, the J point is the point of first in the present embodiment, and the coordinate that J is ordered is the 3rd three-dimensional coordinate.
The 7th, determine that first the 3rd corresponding in three-dimensional system of coordinate three-dimensional coordinate is the first three-dimensional coordinate of two-dimensional coordinate correspondence in the volume reconstruction image.
In this step, determine that the coordinate that J is ordered is the three-dimensional coordinate of i point in the object space of correspondence.
Take Fig. 4 as example, aforesaid operations can be specially:
A is with I(x, y, z) be starting point, advance to the direction away from initial point along ray oi according to the step-length d of unit.Can obtain a series of sampled point jn, n=0,1,2 ...Wherein, j0=I(x, y, z).
B, the gray-scale value of supposing the object dimensional locus at each sampled point jn place is fn=f(jn), n=0,1,2 ...
C, the gray-scale value corresponding according to the current display effect of volume reconstruction image-transparency mapping function can obtain transparency gn=g(f(jn corresponding to each sampled point jn)), n=0,1,2 ..., usually, the span of gn is [0,1].
D adopts following alternative manner, determines in the volume reconstruction image coordinate points i(x ', y ') corresponding human space three-dimensional coordinate:
1, set transparency threshold value H, transparency threshold value herein can rule of thumb be preset, and usually, the value of H is 0.8～0.9;
2, set transparency accumulated value h, initial value is 0, i.e. h=0;
3, set loop variable n=0;
4, make h=h+g(f(jn));
5, if h＜H then makes n=n+1, return execution in step 4; Otherwise, continue execution in step 6;
6, three-dimensional body volume coordinate corresponding to output jn.
Obtain two-dimensional coordinate in the volume reconstruction image after corresponding the first three-dimensional coordinate, can determine distance between primary importance and the second place according to three-dimensional coordinate and the second place the three-dimensional coordinate in volume reconstruction image of primary importance in the volume reconstruction image.
Adopt above-mentioned three-dimensional coordinate to determine method, can be in the volume reconstruction image, determine in the space 2 P1 and P2.Line segment length between 2 of P1 and the P2 is:
The user can be take linear measure longimetry line segment P1P2 as axle in device 5, and rotation changes the direction of tangent plane reconstructed image.And in the tangent plane reconstructed image, further adjust the position of P1 or P2.Adopt this step, can accurate adjustment P1 or the position of P2, guarantee measuring accuracy.
If the user has determined three points, can determine the angle at the angle that three points consist of, that is, and after the primary importance, the second place and the 3rd position that obtain user's click,, determine the size of the angle take the second place as the summit that primary importance, the second place and the 3rd position form.For example, behind the position of determining 3 of V1, V2 and V3, the angle between vectorial V2V1 and vectorial V2V3 is:
Wherein, the vector of V1 is pointed in V2V1 representative from V2, and the vector of V3, cos＜*, * are pointed in the V2V3 representative from V2〉represent the cosine value of two formed angles of vector.
In the present embodiment, can also change position or the direction of shown tangent plane reconstructed image.Comprise, keep the normal vector on plane, tangent plane reconstructed image place constant, make the tangent plane reconstructed image vertically mobile along normal vector; Make the tangent plane reconstructed image take vectorial V2V1 or V2V3 as axle, rotation changes the direction of tangent plane reconstructed image.
The present embodiment both can comprise that the user determined the process of distance or angle for the first time, can comprise that also the user adjusts the process of again determining distance or angle after the click location.For example, in this step, after can obtaining primary importance that the user determines for the first time, the second place, the 3rd position, can obtain and show the common plane at place, above-mentioned position, and show that corresponding tangent plane reconstructed image, user can pull adjustment primary importance, the second place and the 3rd position in the tangent plane reconstructed image, also can adjust the position that changes the tangent plane reconstructed image, in new tangent plane reconstructed image, specify new primary importance, the second place and the 3rd position.
Need in the prior art at first to obtain the distance that to measure or the plane at angle place by manual adjustments, in the present embodiment, can directly in the volume reconstruction image, carry out distance or measurement of angle.Need to prove, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the process flow diagram of accompanying drawing, and, although there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the memory storage and be carried out by calculation element, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. definite method of a three-dimensional coordinate is characterized in that, comprising:
Obtain the volume reconstruction image, wherein, described volume reconstruction image is two dimensional image, and comprises three-dimensional object in the described two dimensional image;
Obtain respectively primary importance and the second place two-dimensional coordinate in described volume reconstruction image, wherein, described primary importance and the described second place are two diverse locations that the user clicks the volume reconstruction image;
Determine the first three-dimensional coordinate of described two-dimensional coordinate correspondence in described volume reconstruction image.
2. definite method of three-dimensional coordinate according to claim 1 is characterized in that, obtains three-dimensional coordinate corresponding to described two-dimensional coordinate and comprises:
Obtain default viewpoint and the three-dimensional system of coordinate take described viewpoint as initial point, wherein, described volume reconstruction image is arranged in described three-dimensional system of coordinate;
Obtain the second three-dimensional coordinate of described two-dimensional coordinate correspondence in described three-dimensional system of coordinate;
Obtain the gray-scale value of the point on the default ray, wherein, described default ray passes the ray of point corresponding to described the second three-dimensional coordinate for take described initial point as starting point;
Obtain the corresponding relation of described gray-scale value and transparency;
Obtain default transparency threshold value;
Obtain the 3rd three-dimensional coordinate, wherein, corresponding first of described the 3rd three-dimensional coordinate is on described default ray, and described first is greater than the point of described transparency threshold value along first transparency accumulated value on the direction of described default ray; And
Determine described first the first three-dimensional coordinate that the 3rd corresponding in described three-dimensional system of coordinate three-dimensional coordinate is described two-dimensional coordinate correspondence in described volume reconstruction image.
3. definite method of three-dimensional coordinate according to claim 1 is characterized in that, after the first three-dimensional coordinate that obtains described two-dimensional coordinate correspondence in described volume reconstruction image, described method also comprises:
Determine distance between described primary importance and the described second place according to three-dimensional coordinate and the three-dimensional coordinate of the described second place in described volume reconstruction image of described primary importance in described volume reconstruction image.
4. definite method of three-dimensional coordinate according to claim 3 is characterized in that, determines that the distance between described primary importance and the described second place comprises:
Obtain primary importance and the two-dimensional coordinate of the second place in described volume reconstruction image that the user selectes again; And
Determine the described primary importance of again selecting and the distance between the second place.
5. definite method of three-dimensional coordinate according to claim 3 is characterized in that,
Obtaining respectively primary importance and the second place two-dimensional coordinate in described volume reconstruction image comprises:
Obtain primary importance, the second place and the 3rd position that the user clicks,
Obtain after the first three-dimensional coordinate of described two-dimensional coordinate correspondence in described volume reconstruction image, described method also comprises:
Determine the size of the angle take the described second place as the summit that described primary importance, the described second place and described the 3rd position form.
6. definite method of three-dimensional coordinate according to claim 1 is characterized in that, after the first three-dimensional coordinate that obtains described two-dimensional coordinate correspondence in described volume reconstruction image, described method also comprises:
Determine the common plane of described primary importance and the described second place according to the three-dimensional coordinate of the three-dimensional coordinate of described primary importance and the described second place, wherein, described common plane is the plane at described primary importance and described second place place.
7. definite method of three-dimensional coordinate according to claim 6 is characterized in that, determines that according to the three-dimensional coordinate of described primary importance and the three-dimensional coordinate of the described second place the common plane at described primary importance and described second place place comprises:
Determine the plane at described primary importance place;
Judge and comprise whether the plane of described primary importance comprises the second place;
Determine to comprise that simultaneously the plane of described primary importance and the described second place is the common plane of described primary importance and the described second place.
8. definite device of a three-dimensional coordinate is characterized in that, comprising:
The first acquiring unit is used for obtaining the volume reconstruction image, and wherein, described volume reconstruction image is two dimensional image, and comprises three-dimensional scanning object in the described two dimensional image;
Second acquisition unit is used for obtaining primary importance and the second place at the two-dimensional coordinate of described volume reconstruction image respectively, and wherein, described primary importance and the described second place are two diverse locations that the user clicks the volume reconstruction image; And
The first determining unit is used for determining three-dimensional coordinate corresponding to described two-dimensional coordinate.
9. definite method of three-dimensional coordinate according to claim 8 is characterized in that, described second acquisition unit comprises:
First obtains subelement, is used for obtaining default viewpoint and the three-dimensional system of coordinate take described viewpoint as initial point, and wherein, described volume reconstruction image is arranged in described three-dimensional system of coordinate;
Second obtains subelement, is used for obtaining described two-dimensional coordinate at the second three-dimensional coordinate corresponding to described three-dimensional system of coordinate;
The 3rd obtains subelement, is used for obtaining the gray-scale value of the point on the default ray, and wherein, described default ray passes the ray of point corresponding to described the second three-dimensional coordinate for take described initial point as starting point;
The 4th obtains subelement, is used for obtaining the corresponding relation of described gray-scale value and transparency;
The 5th obtains subelement, is used for obtaining default transparency threshold value;
The 6th obtains subelement, be used for obtaining the 3rd three-dimensional coordinate, wherein, corresponding first of described the 3rd three-dimensional coordinate is on described default ray, and described first is greater than the point of described transparency threshold value along first transparency accumulated value on the direction of described default ray; And
First determines subelement, is used for determining that be the first three-dimensional coordinate of described two-dimensional coordinate correspondence in described volume reconstruction image at the 3rd three-dimensional coordinate corresponding to described three-dimensional system of coordinate at described first.
10. definite method of three-dimensional coordinate according to claim 8 is characterized in that, described device also comprises:
The second determining unit is used for determining distance between described primary importance and the described second place according to described primary importance at the three-dimensional coordinate of described volume reconstruction image and the three-dimensional coordinate of the described second place in described volume reconstruction image.
11. definite method of three-dimensional coordinate according to claim 10 is characterized in that, described the second determining unit comprises:
The 7th obtains subelement, be used for obtaining the user again selected primary importance and the second place at the two-dimensional coordinate of described volume reconstruction image; And
Second determines subelement, is used for determining the described primary importance of again selecting and the distance between the second place.
12. definite method of three-dimensional coordinate according to claim 10 is characterized in that,
Described second acquisition unit also is used for obtaining primary importance, the second place and the 3rd position that the user clicks,
Described device also comprises:
The 3rd determining unit is for the size of determining the angle take the described second place as the summit that described primary importance, the described second place and described the 3rd position form.
13. definite method of three-dimensional coordinate according to claim 8 is characterized in that, described device also comprises:
The 4th determining unit, be used for determining according to the three-dimensional coordinate of the three-dimensional coordinate of described primary importance and the described second place the common plane of described primary importance and the described second place, wherein, described common plane is the plane at described primary importance and described second place place.
14. definite method of three-dimensional coordinate according to claim 13 is characterized in that, described the 4th determining unit comprises:
The 3rd determines subelement, is used for determining the plane at described primary importance place;
Judgment sub-unit is used for judging comprising whether the plane of described primary importance comprises the second place;
The 4th determines subelement, is used for determining to comprise that simultaneously the plane of described primary importance and the described second place is the common plane of described primary importance and the described second place.
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