CN105468208A - Electronic whiteboard trace tracking method and apparatus - Google Patents
Electronic whiteboard trace tracking method and apparatus Download PDFInfo
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- CN105468208A CN105468208A CN201410456464.3A CN201410456464A CN105468208A CN 105468208 A CN105468208 A CN 105468208A CN 201410456464 A CN201410456464 A CN 201410456464A CN 105468208 A CN105468208 A CN 105468208A
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Abstract
The present invention discloses an electronic whiteboard trace tracking method and apparatus. The method comprises the steps of: marking at least one to-be-tracked trace curve; calculating distances between each sample coordinates and curvilinear coordinates of the last point in each trace curve successively, and determining a distance minimum among the distances; setting a distance threshold; and comparing the distance minimum with the distance threshold, and if the distance minimum is greater than the distance threshold, setting the sample coordinates corresponding to the distance minimum as a starting point of a new trace curve, or otherwise setting the sample coordinates corresponding to the distance minimum as new curvilinear coordinates of the trace curve where the curvilinear coordinates corresponding to the distance minimum are located. The apparatus comprises a calculation module and a comparison module which are successively connected. According to the method and apparatus provided by the present invention, the distance threshold and an angle threshold are set for further determination of the calculated distances and a vectorial angle during the electronic whiteboard touch trace tracking process, so that the sample coordinates can be matched on the trace curve more accurately, and tracking errors such as point breaking and track crossing are avoided.
Description
Technical field
The present invention relates to electronic whiteboard technology field, be specifically related to a kind of electronic whiteboard trace tracking method and device.
Background technology
Interactive electric whiteboard is that human-computer interaction device is assisted in the education of a kind of advanced person or meeting, and it can coordinate the instrument such as projector, computer, realizes dust-free writing, arbitrarily writes, the function such as remote communication.The variforms such as front projection type, back projection type and clipboard are had viewed from construction profile; From hardware principle, interactive electric whiteboard has merged Large Screen Projection Technology, pinpoint measuring technology etc.On the International or National market of present stage, have multiple technologies can realize electronic whiteboard accurately to locate, representative is the technology such as infrared ray, electromagnetic induction, electric capacity, ultrasound wave, CCD, and often kind of technology has different characteristics and advantages, commercially occupies certain share.
Touch point coordinate is fitted on corresponding track and is also shown by the track following process of electronic whiteboard exactly, and the accuracy of track following directly has influence on white board writing effect.The trace tracking method of prior art, due to accurate not, often there will be breakpoint, track cross and even cannot distinguish path.
Summary of the invention
The technical problem to be solved in the present invention is; for the deficiencies in the prior art; there is provided a kind of electronic whiteboard trace tracking method and device, the electronic whiteboard trace tracking method overcoming prior art is accurate not, often there will be the defect that breakpoint, track cross even cannot distinguish path.
The present invention for solving the problems of the technologies described above adopted technical scheme is:
A kind of electronic whiteboard trace tracking method, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate successively geometric locus last point curvilinear coordinates described in each sample coordinate and every bar distance and determine the distance minimum value in described distance;
A3, setpoint distance threshold value;
A4, more described distance minimum value and described distance threshold, if described distance minimum value is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
According to embodiments of the invention, comprise steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
A kind of electronic whiteboard trace tracking method, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate geometric locus last point curvilinear coordinates described in vector that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined and every bar successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle;
A3, setting angle threshold value;
A4, more described angle minimum value and described angle threshold value, if described angle minimum value is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
According to embodiments of the invention, comprise steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
A kind of electronic whiteboard trace tracking method, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate successively geometric locus last point curvilinear coordinates described in each sample coordinate and every bar distance and determine the distance minimum value in described distance, calculate vector that described geometric locus last point curvilinear coordinates corresponding to described distance minimum value determine and described geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines;
A3, setting angle threshold value;
A4, more described angle and described angle threshold value, if described angle is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
According to embodiments of the invention, comprise steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
A kind of electronic whiteboard trace tracking method, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate geometric locus last point curvilinear coordinates described in vector that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined and every bar successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle, calculate the distance of described sample coordinate corresponding to described angle minimum value and described geometric locus last point curvilinear coordinates;
A3, setpoint distance threshold value;
Distance threshold described in A4, more described Distance geometry, if described distance is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
According to embodiments of the invention, comprise steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
A kind of electronic whiteboard trace tracking method, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate successively geometric locus last point curvilinear coordinates described in each sample coordinate and every bar distance and determine the distance minimum value in described distance, calculate vector that described geometric locus last point curvilinear coordinates corresponding to described distance minimum value determine and described geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines;
A3, setpoint distance threshold value and angle threshold value;
A4, more described distance minimum value and described distance threshold, if described distance minimum value is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise more described angle and described angle threshold value further, if described angle is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
According to embodiments of the invention, comprise steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
A kind of electronic whiteboard trace tracking method, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate geometric locus last point curvilinear coordinates described in vector that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined and every bar successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle, calculate the distance of sample coordinate corresponding to the described angle minimum value described geometric locus last point curvilinear coordinates corresponding with described angle minimum value;
A3, setting angle threshold value and distance threshold;
A4, more described angle minimum value and described angle threshold value, if described angle minimum value is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise distance threshold described in more described Distance geometry further, if described distance is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
According to embodiments of the invention, comprise steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
A kind of electronic whiteboard track tracing device, comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate the distance of geometric locus last point curvilinear coordinates described in each sample coordinate and every bar successively and determine the distance minimum value in described distance, described comparison module is used for setpoint distance threshold value, more described distance minimum value and described distance threshold, if described distance minimum value is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
A kind of electronic whiteboard track tracing device, comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate geometric locus last point curvilinear coordinates described in vector and every bar that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle, described comparison module is for setting angle threshold value, more described angle minimum value and described angle threshold value, if described angle minimum value is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
A kind of electronic whiteboard track tracing device, comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate the distance of geometric locus last point curvilinear coordinates described in each sample coordinate and every bar successively and determine the distance minimum value in described distance, calculate vector that described geometric locus last point curvilinear coordinates corresponding to described distance minimum value determine and described geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines, described comparison module is for setting angle threshold value, more described angle and described angle threshold value, if described angle is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
A kind of electronic whiteboard track tracing device, comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate geometric locus last point curvilinear coordinates described in vector and every bar that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle, calculate the distance of described sample coordinate corresponding to described angle minimum value and described geometric locus last point curvilinear coordinates, described comparison module is used for setpoint distance threshold value, distance threshold described in more described Distance geometry, if described distance is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
A kind of electronic whiteboard track tracing device, comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate the distance of geometric locus last point curvilinear coordinates described in each sample coordinate and every bar successively and determine the distance minimum value in described distance, calculate vector that described geometric locus last point curvilinear coordinates corresponding to described distance minimum value determine and described geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines, described comparison module is used for setpoint distance threshold value and angle threshold value, more described distance minimum value and described distance threshold, if described distance minimum value is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise more described angle and described angle threshold value further, if described angle is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
A kind of electronic whiteboard track tracing device, comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate geometric locus last point curvilinear coordinates described in vector and every bar that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle, calculate the distance of sample coordinate corresponding to the described angle minimum value described geometric locus last point curvilinear coordinates corresponding with described angle minimum value, described comparison module is for setting angle threshold value and distance threshold, more described angle minimum value and described angle threshold value, if described angle minimum value is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise distance threshold described in more described Distance geometry further, if described distance is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
Implement technical scheme of the present invention, there is following beneficial effect: the present invention in electronic whiteboard touch track tracing process, arrange distance threshold and angle threshold value judges further to the Distance geometry vector angle calculated, can more accurately sample coordinate be matched on geometric locus, avoid the trail-and-error such as breakpoint, track cross.
Accompanying drawing explanation
Below by with reference to accompanying drawing describe the present invention particularly in conjunction with example, advantage of the present invention and implementation will be more obvious, wherein content shown in accompanying drawing is only for explanation of the present invention, and does not form restriction of going up in all senses of the present invention, in the accompanying drawings:
Fig. 1 is electronic whiteboard trace tracking method computation process schematic diagram of the present invention;
Fig. 2 is electronic whiteboard trace tracking method embodiment process flow diagram of the present invention;
Fig. 3 is another embodiment process flow diagram of electronic whiteboard trace tracking method of the present invention;
Fig. 4 is electronic whiteboard track tracing device schematic diagram of the present invention.
Embodiment
Electronic whiteboard is underlying device, so electronic whiteboard will do is exactly done by touch points all for synchronization and mate when there being touch control operation, according to " nearby, angle is little " two large principle determination track, put on the ID of affiliated track, then packing sends to PC to carry out track display.
1, nearby principle: so-called nearby principle is exactly touch point coordinate (x to be matched, y) with last coordinate (X put in track, Y) distance between is short, i.e. D=(x-X) * (x-X)+(y-Y) * (y-Y), D is enough little, as how much little, according to the operation of reality, fixed a threshold values V, D are only less than V and just can think it may is the point that track is new, otherwise abandon it.
2, the little principle of angle: the little principle of so-called angle is exactly the vectorial V1 that touch point to be matched and last point of track form, the vectorial V2 that last point of track forms with track penultimate point, angle theta between two vectors is little, same definable threshold values θ 1, be less than the point thinking that track is new, be greater than and abandon it.
As shown in Figure 1,123 3 points that solid line connects are effective tracks, the point 4 that dotted line connects is touch points to be matched, by point 43 composition of vector V1, by point 32 composition of vector V2, V1, V2 calculate angle theta, angle theta requires little, and 43 calculate distance D, distance D meets nearby, both are simultaneously satisfied is less than threshold values, then think that the match is successful.
Just different embodiment of the present invention lists technical scheme below:
Embodiment 1
Electronic whiteboard trace tracking method of the present invention, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate successively each sample coordinate and every bar geometric locus last point curvilinear coordinates distance and determine distance in distance minimum value;
A3, setpoint distance threshold value;
A4, compare distance minimum value and distance threshold, if distance minimum value is greater than distance threshold, the sample coordinate that then setpoint distance minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the setpoint distance minimum value curvilinear coordinates place that to be distance minimum value corresponding.
Comprise steps A 5 further: if geometric locus does not match new curvilinear coordinates, then abandon the tracking to geometric locus.
Embodiment 2
Electronic whiteboard trace tracking method of the present invention, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate vector that each sample coordinate and every bar geometric locus last point curvilinear coordinates determine and every bar geometric locus last point curvilinear coordinates successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in angle;
A3, setting angle threshold value;
A4, compare angle minimum value and angle threshold value, if angle minimum value is greater than angle threshold value, the sample coordinate that then set angle minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the set angle minimum value curvilinear coordinates place that to be angle minimum value corresponding.
Comprise steps A 5 further: if geometric locus does not match new curvilinear coordinates, then abandon the tracking to geometric locus.
Embodiment 3
Electronic whiteboard trace tracking method of the present invention, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate successively each sample coordinate and every bar geometric locus last point curvilinear coordinates distance and determine the distance minimum value in distance, calculate vector that geometric locus last point curvilinear coordinates corresponding to distance minimum value determine and geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines;
A3, setting angle threshold value;
A4, compare angle and angle threshold value, if angle is greater than angle threshold value, the sample coordinate that then setpoint distance minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the setpoint distance minimum value curvilinear coordinates place that to be distance minimum value corresponding.
Comprise steps A 5 further: if geometric locus does not match new curvilinear coordinates, then abandon the tracking to geometric locus.
Embodiment 4
Electronic whiteboard trace tracking method of the present invention, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate vector that each sample coordinate and every bar geometric locus last point curvilinear coordinates determine and every bar geometric locus last point curvilinear coordinates successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in angle, calculate the distance of sample coordinate corresponding to angle minimum value and geometric locus last point curvilinear coordinates;
A3, setpoint distance threshold value;
A4, compare Distance geometry distance threshold, if distance is greater than distance threshold, the sample coordinate that then set angle minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the set angle minimum value curvilinear coordinates place that to be angle minimum value corresponding.
Comprise steps A 5 further: if geometric locus does not match new curvilinear coordinates, then abandon the tracking to geometric locus.
Embodiment 5
As shown in Figure 2, electronic whiteboard trace tracking method of the present invention, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate successively each sample coordinate and every bar geometric locus last point curvilinear coordinates distance and determine the distance minimum value in distance, calculate vector that geometric locus last point curvilinear coordinates corresponding to distance minimum value determine and geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines;
A3, setpoint distance threshold value and angle threshold value;
A4, compare distance minimum value and distance threshold, if distance minimum value is greater than distance threshold, the sample coordinate that then setpoint distance minimum value is corresponding is the starting point of new geometric locus, otherwise compare angle and angle threshold value further, if angle is greater than angle threshold value, the sample coordinate that then setpoint distance minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the setpoint distance minimum value curvilinear coordinates place that to be distance minimum value corresponding.
Comprise steps A 5 further: if geometric locus does not match new curvilinear coordinates, then abandon the tracking to geometric locus.
Embodiment 6
As shown in Figure 3, electronic whiteboard trace tracking method of the present invention, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate vector that each sample coordinate and every bar geometric locus last point curvilinear coordinates determine and every bar geometric locus last point curvilinear coordinates successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in angle, calculate the distance of sample coordinate corresponding to the angle minimum value geometric locus last point curvilinear coordinates corresponding with angle minimum value;
A3, setting angle threshold value and distance threshold;
A4, compare angle minimum value and angle threshold value, if angle minimum value is greater than angle threshold value, the sample coordinate that then set angle minimum value is corresponding is the starting point of new geometric locus, otherwise compare Distance geometry distance threshold further, if distance is greater than distance threshold, the sample coordinate that then set angle minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the set angle minimum value curvilinear coordinates place that to be angle minimum value corresponding.
Comprise steps A 5 further: if geometric locus does not match new curvilinear coordinates, then abandon the tracking to geometric locus.
As shown in Figure 3, electronic whiteboard track tracing device of the present invention, comprise the computing module and comparison module that connect successively, at least one geometric locus that computing module is used for preparing to follow the tracks of marks, calculate the distance of each sample coordinate and every bar geometric locus last point curvilinear coordinates successively and determine the distance minimum value in distance, comparison module is used for setpoint distance threshold value, relatively distance minimum value and distance threshold, if distance minimum value is greater than distance threshold, the sample coordinate that then setpoint distance minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the setpoint distance minimum value curvilinear coordinates place that to be distance minimum value corresponding.
The another kind of real-time mode of electronic whiteboard track tracing device of the present invention, comprise the computing module and comparison module that connect successively, at least one geometric locus that computing module is used for preparing to follow the tracks of marks, calculate vector that each sample coordinate and every bar geometric locus last point curvilinear coordinates determine and every bar geometric locus last point curvilinear coordinates successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in angle, comparison module is for setting angle threshold value, relatively angle minimum value and angle threshold value, if angle minimum value is greater than angle threshold value, the sample coordinate that then set angle minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the set angle minimum value curvilinear coordinates place that to be angle minimum value corresponding.
The another kind of real-time mode of electronic whiteboard track tracing device of the present invention, comprise the computing module and comparison module that connect successively, at least one geometric locus that computing module is used for preparing to follow the tracks of marks, calculate the distance of each sample coordinate and every bar geometric locus last point curvilinear coordinates successively and determine the distance minimum value in distance, calculate vector that geometric locus last point curvilinear coordinates corresponding to distance minimum value determine and geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines, comparison module is for setting angle threshold value, relatively angle and angle threshold value, if angle is greater than angle threshold value, the sample coordinate that then setpoint distance minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the setpoint distance minimum value curvilinear coordinates place that to be distance minimum value corresponding.
The another kind of real-time mode of electronic whiteboard track tracing device of the present invention, comprise the computing module and comparison module that connect successively, at least one geometric locus that computing module is used for preparing to follow the tracks of marks, calculate vector that each sample coordinate and every bar geometric locus last point curvilinear coordinates determine and every bar geometric locus last point curvilinear coordinates successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in angle, calculate the distance of sample coordinate corresponding to angle minimum value and geometric locus last point curvilinear coordinates, comparison module is used for setpoint distance threshold value, relatively Distance geometry distance threshold, if distance is greater than distance threshold, the sample coordinate that then set angle minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the set angle minimum value curvilinear coordinates place that to be angle minimum value corresponding.
The another kind of real-time mode of electronic whiteboard track tracing device of the present invention, comprise the computing module and comparison module that connect successively, at least one geometric locus that computing module is used for preparing to follow the tracks of marks, calculate the distance of each sample coordinate and every bar geometric locus last point curvilinear coordinates successively and determine the distance minimum value in distance, calculate vector that geometric locus last point curvilinear coordinates corresponding to distance minimum value determine and geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines, comparison module is used for setpoint distance threshold value and angle threshold value, relatively distance minimum value and distance threshold, if distance minimum value is greater than distance threshold, the sample coordinate that then setpoint distance minimum value is corresponding is the starting point of new geometric locus, otherwise compare angle and angle threshold value further, if angle is greater than angle threshold value, the sample coordinate that then setpoint distance minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the setpoint distance minimum value curvilinear coordinates place that to be distance minimum value corresponding.
The another kind of real-time mode of electronic whiteboard track tracing device of the present invention, comprise the computing module and comparison module that connect successively, at least one geometric locus that computing module is used for preparing to follow the tracks of marks, calculate vector that each sample coordinate and every bar geometric locus last point curvilinear coordinates determine and every bar geometric locus last point curvilinear coordinates successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in angle, calculate the distance of sample coordinate corresponding to the angle minimum value geometric locus last point curvilinear coordinates corresponding with angle minimum value, comparison module is for setting angle threshold value and distance threshold, relatively angle minimum value and angle threshold value, if angle minimum value is greater than angle threshold value, the sample coordinate that then set angle minimum value is corresponding is the starting point of new geometric locus, otherwise compare Distance geometry distance threshold further, if distance is greater than distance threshold, the sample coordinate that then set angle minimum value is corresponding is the starting point of new geometric locus, otherwise the new curvilinear coordinates of the geometric locus at sample coordinate corresponding to the set angle minimum value curvilinear coordinates place that to be angle minimum value corresponding.
Those skilled in the art do not depart from essence of the present invention and spirit, various deformation scheme can be had to realize the present invention, the foregoing is only the better feasible embodiment of the present invention, not thereby interest field of the present invention is limited to, the equivalent structure change that all utilizations instructions of the present invention and accompanying drawing content are done, is all contained within interest field of the present invention.
Claims (18)
1. an electronic whiteboard trace tracking method, is characterized in that, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate successively geometric locus last point curvilinear coordinates described in each sample coordinate and every bar distance and determine the distance minimum value in described distance;
A3, setpoint distance threshold value;
A4, more described distance minimum value and described distance threshold, if described distance minimum value is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
2. electronic whiteboard trace tracking method according to claim 1, is characterized in that, comprises steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
3. an electronic whiteboard trace tracking method, is characterized in that, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate geometric locus last point curvilinear coordinates described in vector that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined and every bar successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle;
A3, setting angle threshold value;
A4, more described angle minimum value and described angle threshold value, if described angle minimum value is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
4. electronic whiteboard trace tracking method according to claim 3, is characterized in that, comprises steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
5. an electronic whiteboard trace tracking method, is characterized in that, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate successively geometric locus last point curvilinear coordinates described in each sample coordinate and every bar distance and determine the distance minimum value in described distance, calculate vector that described geometric locus last point curvilinear coordinates corresponding to described distance minimum value determine and described geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines;
A3, setting angle threshold value;
A4, more described angle and described angle threshold value, if described angle is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
6. electronic whiteboard trace tracking method according to claim 5, is characterized in that, comprises steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
7. an electronic whiteboard trace tracking method, is characterized in that, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate geometric locus last point curvilinear coordinates described in vector that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined and every bar successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle, calculate the distance of described sample coordinate corresponding to described angle minimum value and described geometric locus last point curvilinear coordinates;
A3, setpoint distance threshold value;
Distance threshold described in A4, more described Distance geometry, if described distance is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
8. electronic whiteboard trace tracking method according to claim 7, is characterized in that, comprises steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
9. an electronic whiteboard trace tracking method, is characterized in that, comprises step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate successively geometric locus last point curvilinear coordinates described in each sample coordinate and every bar distance and determine the distance minimum value in described distance, calculate vector that described geometric locus last point curvilinear coordinates corresponding to described distance minimum value determine and described geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines;
A3, setpoint distance threshold value and angle threshold value;
A4, more described distance minimum value and described distance threshold, if described distance minimum value is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise more described angle and described angle threshold value further, if described angle is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
10. electronic whiteboard trace tracking method according to claim 9, is characterized in that, comprises steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
11. 1 kinds of electronic whiteboard trace tracking methods, is characterized in that, comprise step:
A1, to prepare follow the tracks of at least one geometric locus mark;
A2, calculate geometric locus last point curvilinear coordinates described in vector that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined and every bar successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle, calculate the distance of sample coordinate corresponding to the described angle minimum value described geometric locus last point curvilinear coordinates corresponding with described angle minimum value;
A3, setting angle threshold value and distance threshold;
A4, more described angle minimum value and described angle threshold value, if described angle minimum value is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise distance threshold described in more described Distance geometry further, if described distance is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
12. electronic whiteboard trace tracking methods according to claim 11, is characterized in that, comprise steps A 5: if described geometric locus does not match new curvilinear coordinates, then abandon the tracking to described geometric locus.
13. 1 kinds of electronic whiteboard track tracing devices, it is characterized in that: comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate the distance of geometric locus last point curvilinear coordinates described in each sample coordinate and every bar successively and determine the distance minimum value in described distance, described comparison module is used for setpoint distance threshold value, more described distance minimum value and described distance threshold, if described distance minimum value is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
14. 1 kinds of electronic whiteboard track tracing devices, it is characterized in that: comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate geometric locus last point curvilinear coordinates described in vector and every bar that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle, described comparison module is for setting angle threshold value, more described angle minimum value and described angle threshold value, if described angle minimum value is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
15. 1 kinds of electronic whiteboard track tracing devices, it is characterized in that: comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate the distance of geometric locus last point curvilinear coordinates described in each sample coordinate and every bar successively and determine the distance minimum value in described distance, calculate vector that described geometric locus last point curvilinear coordinates corresponding to described distance minimum value determine and described geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines, described comparison module is for setting angle threshold value, more described angle and described angle threshold value, if described angle is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
16. 1 kinds of electronic whiteboard track tracing devices, it is characterized in that: comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate geometric locus last point curvilinear coordinates described in vector and every bar that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle, calculate the distance of described sample coordinate corresponding to described angle minimum value and described geometric locus last point curvilinear coordinates, described comparison module is used for setpoint distance threshold value, distance threshold described in more described Distance geometry, if described distance is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
17. 1 kinds of electronic whiteboard track tracing devices, it is characterized in that: comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate the distance of geometric locus last point curvilinear coordinates described in each sample coordinate and every bar successively and determine the distance minimum value in described distance, calculate vector that described geometric locus last point curvilinear coordinates corresponding to described distance minimum value determine and described geometric locus last point curvilinear coordinates and be adjacent angle between vector that curvilinear coordinates determines, described comparison module is used for setpoint distance threshold value and angle threshold value, more described distance minimum value and described distance threshold, if described distance minimum value is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise more described angle and described angle threshold value further, if described angle is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described distance minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described distance minimum value is the described geometric locus at the described described curvilinear coordinates place corresponding apart from minimum value.
18. 1 kinds of electronic whiteboard track tracing devices, it is characterized in that: comprise the computing module and comparison module that connect successively, at least one geometric locus that described computing module is used for preparing to follow the tracks of marks, calculate geometric locus last point curvilinear coordinates described in vector and every bar that described in each sample coordinate and every bar, geometric locus last point curvilinear coordinates is determined successively and be adjacent angle between vector that curvilinear coordinates determines, determine the angle minimum value in described angle, calculate the distance of sample coordinate corresponding to the described angle minimum value described geometric locus last point curvilinear coordinates corresponding with described angle minimum value, described comparison module is for setting angle threshold value and distance threshold, more described angle minimum value and described angle threshold value, if described angle minimum value is greater than described angle threshold value, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise distance threshold described in more described Distance geometry further, if described distance is greater than described distance threshold, then set the starting point that described sample coordinate corresponding to described angle minimum value is new geometric locus, otherwise set the new curvilinear coordinates that described sample coordinate corresponding to described angle minimum value is the described geometric locus at described curvilinear coordinates place corresponding to described angle minimum value.
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