Summary of the invention
The object of the present invention is to provide a kind of scan control method and scanning means, to solve the problem.
In order to achieve the above object, first aspect, the invention provides a kind of scan control method, and for scanning means, this scanning means comprises image sensing processing unit, image acquisition unit, projection process unit and projecting cell, and the method comprises:
This image sensing processing unit sends the first triggering signal to this projection process unit;
This projection process unit receives this first triggering signal, judge from receiving this first triggering signal after first time period, control this projecting cell in second the time period projection for projection multiple projected images in the first projected image on determinand, and projection this first projected image before or send the second triggering signal when projecting this first projected image to this image sensing processing unit;
This image sensing processing unit receives this second triggering signal, judges, from receiving this second triggering signal after the 3rd time period, to control this image acquisition unit and take this determinand to obtain the first shooting picture in the 4th time period;
This image sensing processing unit returns and above-mentionedly sends the step of this first triggering signal to this projection process unit, and this projection process unit repeats this first triggering signal of above-mentioned reception and step afterwards, until when multiple projected images of this this wish of projection process unit judges projection project all, this projection process unit sends image reset signal to this image sensing processing unit;
After this image sensing processing unit receives this image reset signal, this image sensing processing unit takes the number of times of this determinand according to this image reset signal and this image acquisition unit, determine this first shooting picture each be by this wish project multiple projected images in which projected on this determinand time picture;
Wherein, this wish projection multiple projected images at least two projected images different.
Preferably, this second time period was greater than for the 4th time period.
Preferably, judge that this image sensing processing unit returns the step of this first triggering signal of above-mentioned transmission from obtaining this first shooting picture after the 5th time period.
Second aspect, the invention provides a kind of scan control method, and for scanning means, this scanning means comprises image sensing processing unit, image acquisition unit, projection process unit and projecting cell, and the method comprises:
This image sensing processing unit sends the 3rd triggering signal to this projection process unit;
This projection process unit receives the 3rd triggering signal, judges from receiving the 3rd triggering signal after the 9th time period, controls this projecting cell and projects the second projected image in multiple projected images that this wish projects on this determinand in the tenth time period;
This image sensing processing unit judges from sending the 3rd triggering signal after the 6th time period, controls this image acquisition unit in the 7th time period shooting determinand to obtain the second shooting picture;
This image sensing processing unit judges from obtaining this second shooting picture after the 8th time period, return and above-mentionedly send the step of the 3rd triggering signal to this projection process unit, and this projection process unit returns and receives the 3rd triggering signal and step afterwards until when multiple projected images that this this wish of projection process unit judges projects project all, this projection process unit sends image reset signal to this image sensing processing unit;
After this image sensing processing unit receives this image reset signal, this image sensing processing unit takes the number of times of this determinand according to this image reset signal and this image acquisition unit, determine this second shooting picture each be by for projection multiple projected images in which projected on this determinand time picture;
Wherein, this wish projection multiple projected images at least two projected images different.
Preferably, the 6th time period was greater than for the 9th time period, and the tenth time period was greater than for the 7th time period, and the 9th time period and the tenth time period sum are less than the twice of the 6th time period, the 7th time period, the 8th time period sum.
The third aspect, the invention provides a kind of scanning means, and this scanning means comprises: the first memory element, projecting cell, image acquisition unit, the second memory element, projection process unit and image sensing processing unit, this first memory element is for storing the multiple projected images for projection, this projecting cell for project this wish projection multiple projected images in the first projected image to determinand, this image acquisition unit is for taking this determinand, this second memory element is for storing the first shooting picture, this projection process unit couples this first memory element and this projecting cell, this projection process unit is for receiving the first triggering signal, judge from receiving this first triggering signal after first time period, control this projecting cell in the second time period project this wish projection multiple projected images in this first projected image on this determinand, and projection this first projected image before or send the second triggering signal when projecting this first projected image, send image reset signal when judging that multiple projected images that this wish projects project all, this image sensing processing unit couples this projection process unit, this image acquisition unit and this second memory element, this image sensing processing unit is used for sending this first triggering signal to this projection process unit, receive this second triggering signal, judge from receiving this second triggering signal after the 3rd time period, control this image acquisition unit and take this determinand to obtain the first shooting picture in the 4th time period, and store this first shooting picture to this second memory element, this first triggering signal is again sent after obtaining this first shooting picture, after receiving this image reset signal, the number of times taking this determinand according to this image reset signal and this image acquisition unit determine this first shooting picture each be which projected in the multiple projected images projected by this wish on this determinand time picture, wherein, this wish projection multiple projected images at least two projected images different.
Preferably, this second time period was greater than for the 4th time period.
Preferably, this scanning means is mouth cavity scanner.
Fourth aspect, the invention provides a kind of scanning means, and this scanning means comprises: the 3rd memory element, projecting cell, image acquisition unit, the 4th memory element, projection process unit and image sensing processing unit, 3rd memory element is for storing the multiple projected images for projection, this projecting cell for project this wish projection multiple projected images in the second projected image to determinand, this image acquisition unit is for taking this determinand, 4th memory element is for storing the second shooting picture, this image sensing processing unit couples this image acquisition unit and the 4th memory element, this image sensing processing unit is used for sending the 3rd triggering signal, judge from sending the 3rd triggering signal after the 6th time period, control this image acquisition unit in the 7th time period shooting determinand to obtain this second shooting picture and to store this second shooting picture to the 4th memory element, judge from obtaining this second shooting picture after the 8th time period, again send the 3rd triggering signal, after receiving image reset signal, the number of times taking this determinand according to this image reset signal and this image acquisition unit determine this second shooting picture each be which projected in the multiple projected images projected by this wish on this determinand time picture, this projection process unit couples this image sensing processing unit, the 3rd memory element and this projecting cell, this projection process unit is for receiving the 3rd triggering signal, judge from receiving the 3rd triggering signal after the 9th time period, control this projecting cell in the tenth time period project this wish projection multiple projected images in this second projected image on this determinand, when multiple projected images of this this wish of projection process unit judges projection project all, send this image reset signal to this image sensing processing unit, wherein, this wish projection multiple projected images at least two projected images different.
Preferably, this scanning means is mouth cavity scanner.
Compared with prior art, scan control method provided by the invention and scanning means, multiple projected pictures of projection are all not identical and for any black and white or can have the image of GTG, because the image of projection can convert arbitrarily and the image that cannot be able to realize for grating, making can be trickleer various for the difference data of 3D computing, therefore, relative to the 3D model that projection still image builds, accuracy is higher.
Detailed description of the invention
For making there is further understanding to object of the present invention, structure, feature and function thereof, embodiment is hereby coordinated to be described in detail as follows.
The schematic flow sheet of a kind of scan control method that Fig. 1 provides for one embodiment of the invention; Fig. 2 is the time diagram of the scan control method shown in Fig. 1.As shown in Figure 1 and Figure 2, scan control method is used for scanning means, and scanning means can be mouth cavity scanner, and this scanning means comprises image sensing processing unit, image acquisition unit, projection process unit and projecting cell, and this scan control method comprises:
Step S101, image sensing processing unit send the first triggering signal X1 to projection process unit.
Step S102, projection process unit receive the first triggering signal X1, judge from receiving the first triggering signal X1 after first time period T1, control projecting cell to project for the first projected image in multiple projected images of projection on determinand in the second time period T2, and send the second triggering signal X2 to image sensing processing unit before projection first projected image or when projecting the first projected image.Before projection first projected image, the second triggering signal X2 is sent for projection process unit in Fig. 2.
Step S103, image sensing processing unit receive the second triggering signal X2, judge from receiving the second triggering signal X2 after the 3rd time period T3, control image acquisition unit and take determinand to obtain the first shooting picture in the 4th time period T4.
Step S104, image sensing processing unit return and above-mentionedly send the step of the first triggering signal X1 to projection process unit, and projection process unit repeats above-mentioned reception first triggering signal X1 and step afterwards, until when projection process unit judges projects all for the multiple projected images projected, projection process unit sends image reset signal Y to image sensing processing unit.
After step S105, image sensing processing unit receive image reset signal Y, image sensing processing unit according to image reset signal Y and image acquisition unit shooting determinand number of times, determine each first shooting picture be by for projection multiple projected images in which projected on determinand time picture.
Wherein, different at least two projected images in multiple projected images of projection.Second time period T2 is greater than the 4th time period T4 (i.e. T2>T4), effective to ensure the picture that image acquisition unit is taken.Image acquisition unit shooting determinand when projecting cell projection projected image can obtain effective shooting picture, therefore, 4th time period T4 of image acquisition unit shooting determinand should to project the second time period T2 of projected image overlapping at least partly with projecting cell, preferably, the 4th time period T4 of image acquisition unit shooting determinand is within the second time period T2 of projecting cell projection projected image.
As shown in Figure 2, multiple projected images for projection comprise: P1, P2 ... Pn, P1, P2 ... at least two in Pn different, preferably, P1, P2 ... Pn is all different, after image sensing processing unit receives image reset signal Y, the number of times taking determinand before image reset signal Y can be determined, according to the number of times of shooting determinand can determine each shooting picture in multiple shooting picture respectively with multiple projected image P1, P2 ... in Pn, which is corresponding.
Exemplary, image sensing processing unit sends the first triggering signal X1 to projection process unit, projection process unit receives the first triggering signal X1, judge from receiving the first triggering signal X1 after first time period T1, control projecting cell and project projected image P1 on determinand in the second time period T2, and the second triggering signal X2 is sent to image sensing processing unit before projecting projected image P1 or when projecting projected image P1, image sensing processing unit receives the second triggering signal X2, judge from receiving the second triggering signal X2 after the 3rd time period T3, control image acquisition unit and take determinand to obtain shooting picture B1 in the 4th time period T4, image sensing processing unit sends the first triggering signal X1 to projection process unit, projection process unit receives the first triggering signal X1, judge from receiving the first triggering signal X1 after first time period T1, control projecting cell and project projected image P2 on determinand in the second time period T2, and the second triggering signal X2 is sent to image sensing processing unit before projecting projected image P2 or when projecting projected image P2, image sensing processing unit receives the second triggering signal X2, judge from receiving the second triggering signal X2 after the 3rd time period T3, control image acquisition unit and take determinand to obtain shooting picture B2 in the 4th time period T4, image sensing processing unit sends the first triggering signal X1 to projection process unit, projection process unit receives the first triggering signal X1, judge from receiving the first triggering signal X1 after first time period T1, control projecting cell and project projected image P3 on determinand in the second time period T2, and the second triggering signal X2 is sent to image sensing processing unit before projecting projected image P3 or when projecting projected image P3, image sensing processing unit receives the second triggering signal X2, judge from receiving the second triggering signal X2 after the 3rd time period T3, control image acquisition unit and take determinand to obtain shooting picture B3 in the 4th time period T4, circulation performs ... until when projection process unit judges projects all for the multiple projected images projected, projection process unit sends image reset signal Y to image sensing processing unit, after image sensing processing unit receives image reset signal Y, image sensing processing unit according to image reset signal Y and image acquisition unit shooting determinand number of times, determine each first shooting picture be by for projection multiple projected images in which projected on determinand time picture.Suppose image acquisition unit shooting determinand number of times be 5 times, image sensing processing unit can take the number of times (5 times) of determinand according to image reset signal Y and image acquisition unit, determine that shooting picture B1 is first projected image (i.e. projected image P1) in projected image picture when being projeced on determinand, shooting picture B2 is the picture of second projected image (i.e. projected image P2) in projected image when being projeced on determinand, shooting picture B3 is the picture of the 3rd projected image (i.e. projected image P3) in projected image when being projeced on determinand, shooting picture B4 is the picture of the 4th projected image (i.e. projected image P4) in projected image when being projeced on determinand, shooting picture B5 is the picture of the 5th projected image (i.e. projected image P5) in projected image when being projeced on determinand.
Preferably, image sensing processing unit judges, from obtaining the first shooting picture after the 5th time period T5, to return step S101.
Projection process unit also needs to judge whether the multiple projected images for projection project all, the step whether projection process unit judges has projected all for the multiple projected images projected, can before reception first triggering signal X1, or, before projection first projected image or when projecting the first projected image, or, when projected image second time period, T2 completed in projection first or after completing; With after projecting the first projected image second time period T2 in Fig. 2, whether projection process unit judges has projected all for multiple projected images of projection is.The schematic flow sheet example of a kind of scan control method that Fig. 3 provides for another embodiment of the present invention.As shown in Figure 3, before reception first triggering signal X1, whether projection process unit judges projects all for multiple projected images of projection, and this scan control method comprises:
Step S301, image sensing processing unit send the first triggering signal X1 to projection process unit.
Whether step S302, projection process unit judges project all for multiple projected images of projection.If not, step S303 is performed; If so, step S305 is performed.
If step S303 projection process unit judges does not project all for multiple projected images of projection, projection process unit receives the first triggering signal X1, judge from receiving the first triggering signal X1 after first time period T1, control projecting cell second time period T2 to project for the first projected image in multiple projected images of projection on determinand, and send the second triggering signal X2 to image sensing processing unit before projection first projected image or when projecting the first projected image.Wherein, different at least two projected images in multiple projected images of projection, the second time period T2 is greater than the 4th time period T4 (i.e. T2>T4).
Step S304, image sensing processing unit receive the second triggering signal X2, judge from receiving the second triggering signal X2 after the 3rd time period T3, control this image acquisition unit and take determinand to obtain the first shooting picture in the 4th time period T4, and after acquisition first shooting picture, return above-mentioned steps S301.
If step S305 projection process unit judges projects all for multiple projected images of projection, projection process unit sends image reset signal Y to image sensing processing unit.
After step S306, image sensing processing unit receive image reset signal Y, according to image reset signal Y and image acquisition unit shooting determinand number of times determine each first shooting picture be by for projection multiple projected images in which projected on determinand time picture.
Preferably, image sensing processing unit judges, from obtaining the first shooting picture after the 5th time period T5, to return above-mentioned steps S301.
Scan control method provided by the invention, multiple projected pictures of projection are all not identical and for any black and white or can have the image of GTG, because the image of projection can convert arbitrarily and the image that cannot be able to realize for grating, making can be trickleer various for the difference data of 3D computing, therefore, relative to the 3D model that projection still image builds, accuracy is higher.
A kind of scan control method that Fig. 4 provides for another embodiment of the present invention; Fig. 5 is the time diagram of the scan control method shown in Fig. 4.As shown in Figure 4, Figure 5, scan control method is used for scanning means, and scanning means can be mouth cavity scanner, and this scanning means comprises image sensing processing unit, image acquisition unit, projection process unit and projecting cell, and this scan control method comprises:
Step S401, image sensing processing unit send the 3rd triggering signal X3 to projection process unit.
After step S402, projection process unit receive the 3rd triggering signal X3, judging from receiving the 3rd triggering signal X3 after the 9th time period T9, controlling projecting cell and projecting for the second projected image in multiple projected images of projection on determinand in the tenth time period T10.
Step S403, image sensing processing unit judge from sending the 3rd triggering signal X3 after the 6th time period T6, control image acquisition unit and take determinand to obtain the second shooting picture in the 7th time period T7.
Step S404, image sensing processing unit judge from obtaining the second shooting picture after the 8th time period T8, return above-mentioned steps S401, and projection process unit returns above-mentioned reception the 3rd triggering signal X3 and step afterwards, until when projection process unit judges projects all for the multiple projected images projected, projection process unit sends image reset signal Y to image sensing processing unit.
Step S405, image sensing processing unit receive image reset signal Y, image sensing processing unit according to image reset signal Y and image acquisition unit shooting determinand number of times, determine each second shooting picture be by for projection multiple projected images in which projected on determinand time picture.
Wherein, different at least two projected images in multiple projected images of projection.
Image acquisition unit shooting determinand when projecting cell projection projected image can obtain effective shooting picture, therefore, 7th time period T7 of image acquisition unit shooting determinand should to project the tenth time period T10 of projected image overlapping at least partly with projecting cell, preferably, the 7th time period T7 of image acquisition unit shooting determinand is within the tenth time period T10 of projecting cell projection projected image.Preferably, 6th time period T6 is greater than the 9th time period T9, tenth time period T10 is greater than the 7th time period T7,9th time period T9 and the tenth time period T10 sum be less than 2 times of the 6th time period T6, the 7th time period T7, the 8th time period T8 sum (namely, T6>T9, T10>T7, T9+T10<2T6+T7+T8), effective to ensure the picture that image acquisition unit is taken.
As shown in Figure 5, multiple projected images for projection comprise: P1, P2 ... Pn, P1, P2 ... at least two in Pn different, preferably, P1, P2 ... Pn is all different, after image sensing processing unit receives image reset signal Y, the number of times taking determinand before image reset signal Y can be determined, according to the number of times of shooting determinand can determine each shooting picture in multiple shooting picture respectively with multiple projected image P1, P2 ... in Pn, which is corresponding.
Exemplary, image sensing processing unit sends the 3rd triggering signal X3 to projection process unit, after projection process unit receives the 3rd triggering signal X3, judge from receiving the 3rd triggering signal X3 after the 9th time period T9, control projecting cell and project projected image P1 on determinand in the tenth time period T10, image sensing processing unit judges from sending the 3rd triggering signal X3 after the 6th time period T6, controls image acquisition unit and takes determinand to obtain shooting picture D1 in the 7th time period T7, image sensing processing unit judges from obtaining shooting picture D1 after the 8th time period T8, image sensing processing unit sends the 3rd triggering signal X3 to projection process unit, after projection process unit receives the 3rd triggering signal X3, judge from receiving the 3rd triggering signal X3 after the 9th time period T9, control projecting cell and project projected image P2 on determinand in the tenth time period T10, image sensing processing unit judges from sending the 3rd triggering signal X3 after the 6th time period T6, control image acquisition unit and take determinand to obtain shooting picture D2 in the 7th time period T7, image sensing processing unit judges from obtaining shooting picture D2 after the 8th time period T8, image sensing processing unit sends the 3rd triggering signal X3 to projection process unit, after projection process unit receives the 3rd triggering signal X3, judge from receiving the 3rd triggering signal X3 after the 9th time period T9, control projecting cell and project projected image P3 on determinand in the tenth time period T10, image sensing processing unit judges from sending the 3rd triggering signal X3 after the 6th time period T6, control image acquisition unit and take determinand to obtain shooting picture D3 in the 7th time period T7, image sensing processing unit judges from obtaining shooting picture D3 after the 8th time period T8, image sensing processing unit sends the 3rd triggering signal X3 to projection process unit circulation performs, until when projection process unit judges projects all for the multiple projected images projected, projection process unit sends image reset signal Y to image sensing processing unit, image sensing processing unit receives image reset signal Y, image sensing processing unit takes the number of times of determinand according to image reset signal Y and image acquisition unit, determine each second shooting picture be by for projection multiple projected images in which projected on determinand time picture.Suppose image acquisition unit shooting determinand number of times be 4 times, image sensing processing unit can take the number of times (4 times) of determinand according to image reset signal Y and image acquisition unit, determine that shooting picture D1 is first projected image (i.e. projected image P1) in projected image picture when being projeced on determinand, shooting picture D2 is the picture of second projected image (i.e. projected image P2) in projected image when being projeced on determinand, shooting picture D3 is the picture of the 3rd projected image (i.e. projected image P3) in projected image when being projeced on determinand, shooting picture D4 is the picture of the 4th projected image (i.e. projected image P4) in projected image when being projeced on determinand.
Scan control method provided by the invention, multiple projected pictures of projection are all not identical and for any black and white or can have the image of GTG, because the image of projection can convert arbitrarily and the image that cannot be able to realize for grating, making can be trickleer various for the difference data of 3D computing, therefore, relative to the 3D model that projection still image builds, accuracy is higher.
The structural representation of a kind of scanning means that Fig. 6 provides for one embodiment of the invention.As shown in Figure 6, scanning means 1 is for the method shown in Fig. 1-Fig. 3 embodiment.Scanning means 1 comprises: the first memory element 11, projecting cell 12, image acquisition unit 13, second memory element 14, projection process unit 15 and image sensing processing unit 16.First memory element 11 is for storing the multiple projected images for projection.Projecting cell 12 is for projecting for the first projected image in multiple projected images of projection to determinand.Image acquisition unit 13 is for taking determinand.Second memory element 14 is for storing the first shooting picture.Projection process unit 15 couples the first memory element 11 and projecting cell 12, projection process unit 15 is for receiving the first triggering signal X1, judge from receiving the first triggering signal X1 after first time period T1, projection process unit 15 controls projecting cell 12 and projects for the first projected image in multiple projected images of projection on determinand in the second time period T2, and the second triggering signal X2 is sent before projection first projected image or when projecting the first projected image, projection process unit 15 is also for judging whether the multiple projected images for projection project all, and when judging all to project for multiple projected images of projection, send image reset signal Y.Image sensing processing unit 16 couples projection process unit 15, image acquisition unit 13 and the second memory element 14, image sensing processing unit 16 is for sending the first triggering signal X1, and receive the second triggering signal X2, image sensing processing unit 16 judges from receiving the second triggering signal X2 after the 3rd time period T3, control image acquisition unit 13 and take determinand to obtain the first shooting picture in the 4th time period T4, and store the first shooting picture to the second memory element 14, again send the first triggering signal X1 after obtaining the first shooting picture; Affect after sense process unit 16 receives image reset signal Y, the number of times taking determinand according to image reset signal Y and image acquisition unit 13 determine each first shooting picture be by which projected in the multiple projected images for projection on determinand time picture.Wherein, different at least two projected images in multiple projected images of projection.
Further, the second time period T2 is greater than the 4th time period T4, effective to ensure the picture that image acquisition unit 13 is taken.Image acquisition unit 13 takes determinand when projecting cell 12 projects projected image can obtain effective shooting picture, therefore, image acquisition unit 13 take determinand the 4th time period T4 should to project the second time period T2 of projected image overlapping at least partly with projecting cell 12, preferably, the 4th time period T4 that image acquisition unit 13 takes determinand projects at projecting cell 12 within second time period T2 of projected image.
Scanning means 1 can also comprise the necessary element such as light source, lens.
Preferably, scanning means 1 can be mouth cavity scanner.
Scanning means provided by the invention, multiple projected pictures of projection are all not identical and for any black and white or can have the image of GTG, because the image of projection can convert arbitrarily and the image that cannot be able to realize for grating, making can be trickleer various for the difference data of 3D computing, therefore, relative to the 3D model that projection still image builds, accuracy is higher.
The structural representation of a kind of scanning means that Fig. 7 provides for the embodiment of the present invention.As shown in Figure 7, imaging apparatus 2 is for the method shown in Fig. 4-Fig. 5 embodiment, and scanning means 2 comprises: the 3rd memory element 21, projecting cell 22, image acquisition unit 23, the 4th memory element 24, projection process unit 25 and image sensing processing unit 26.3rd memory element 21 is for storing the multiple projected images for projection.Projecting cell 22 is for projecting for the second projected image in multiple projected images of projection to determinand.Image acquisition unit 23 is for taking determinand.4th memory element 24 is for storing the second shooting picture.Image sensing processing unit 26 couples image acquisition unit 23 and the 4th memory element 24, image sensing processing unit 26 is for sending the 3rd triggering signal X3, judge from sending the 3rd triggering signal X3 after the 6th time period T6, control image acquisition unit 23 and take determinand to obtain the second shooting picture and to store the second shooting picture to the 4th memory element 24 in the 7th time period T7, image sensing processing unit 26 judges from obtaining the second shooting picture after the 8th time period T8, again send the 3rd triggering signal X3, after image sensing processing unit 26 receives image reset signal Y, the number of times taking determinand according to image reset signal Y and image acquisition unit 23 determine each second shooting picture be by which projected in the multiple projected images for projection on determinand time picture.Projection process unit 25 couples image sensing processing unit 26, 3rd memory element 21 and projecting cell 22, projection process unit 25 is for receiving the 3rd triggering signal X3, judge from receiving the 3rd triggering signal X3 after the 9th time period T9, control projecting cell 22 to project for the second projected image in multiple projected images of projection on determinand in the tenth time period T10, whether projection process unit judges projects all for multiple projected images of projection, and when projection process unit judges projects all for the multiple projected images projected, projection process unit sends image reset signal Y to image sensing processing unit 26.
Wherein, different at least two projected images in multiple projected images of projection.
Image acquisition unit 23 takes determinand when projecting cell 22 projects projected image can obtain effective shooting picture, therefore, image acquisition unit 23 take determinand the 7th time period T7 should to project the tenth time period T10 of projected image overlapping at least partly with projecting cell 22, preferably, the 7th time period T7 that image acquisition unit 23 takes determinand projects at projecting cell 22 within the tenth time period T10 of projected image.Preferably, 6th time period T6 is greater than the 9th time period T9, tenth time period T10 is greater than the 7th time period T7,9th time period T9 and the tenth time period T10 sum be less than 2 times of the 6th time period T6, the 7th time period T7 and the 8th time period T8 sum (namely, T6>T9, T10>T7, T9+T10<2T6+T7+T8), effective to ensure the picture that image acquisition unit 23 is taken.
Scanning means 2 can also comprise the necessary element such as light source, lens.
Preferably, scanning means can be mouth cavity scanner.
Scanning means provided by the invention, multiple projected pictures of projection are all not identical and for any black and white or can have the image of GTG, because the image of projection can convert arbitrarily and the image that cannot be able to realize for grating, making can be trickleer various for the difference data of 3D computing, therefore, relative to the 3D model that projection still image builds, accuracy is higher.
The present invention is described by above-mentioned related embodiment, but above-described embodiment is only enforcement example of the present invention.Must it is noted that the embodiment disclosed limit the scope of the invention.On the contrary, change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.