CN101877067A - Method and system for hand input based on camera device - Google Patents
Method and system for hand input based on camera device Download PDFInfo
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Abstract
The invention discloses a method for hand input based on a camera device, which comprises the following steps of: arranging a camera device in advance, wherein a display device connected with the camera device displays image information captured by the camera device; determining an input region for hand input based on the image information captured by the camera device; in the current frame captured by the camera device, acquiring an input end of an input device and first display coordinates and second display coordinates of the input end projected in the input region; when the first display coordinates are equal to the second display coordinates, acquiring and recording actual coordinates of the input end in the input region according to the first display coordinates or the second display coordinates, and resetting the current frame; and when the acquired first display coordinates are not equal to the second display coordinates, acquiring handwritings for hand input according to all the recorded actual coordinates of the input end in the input region. The invention also discloses a system for hand input based on a camera device. By using the method and the system, hand input can still be realized without using the traditional hand input device.
Description
Technical field
The present invention relates to the writing technology field, particularly a kind of method and system of the handwriting input based on camera head.
Background technology
In the prior art, when the user wishes the content of the mode mode of input equipments such as keyboard (rather than by) the input required input in computing machine by handwriting input, generally all need to use extra handwriting input device.When using traditional handwriting input device, the user at first needs employed handwriting input device is connected with computing machine, and software or the driver relevant with this handwriting input device be installed in the computing machine that is connected, and then (for example use specific input tool, input pen), and on specific tablet, carry out handwriting input, the content of required input could be input in the computing machine.In the use of above-mentioned handwriting input device, user's operating process more complicated, and the user also need buy extra handwriting input device, thus improved the cost that the user uses the handwriting input mode.For example, Chang Yong traditional handwriting input equipment generally can be divided into three classes such as resistance pressure-sensitive, electromagnetism pressure-sensitive, electric capacity pressure-sensitive.Wherein, though the price of resistance pressure-sensitive and electromagnetism pressure-sensitive handwriting input device is lower, damage than being easier to, and precision is lower; Though and electric capacity pressure-sensitive handwriting input device can be accomplished very high precision, price is very expensive, thereby improves the cost that the user uses the handwriting input mode greatly.
Summary of the invention
In view of this, the invention provides a kind of method and system of the handwriting input based on camera head, thereby improve the simplicity of handwriting input, reduce user's cost.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
A kind of method of the handwriting input based on camera head, this method comprises:
A, a camera head is set, this camera head shows the image information that this camera head absorbs by connected display device;
B, determine the input field of handwriting input according to the image information that camera head absorbed;
C, in the present frame of the image information that described camera head absorbed, the input end that obtains input media in described input field first displaing coordinate and the input end of this input media be projected in second displaing coordinate in the described input field;
D, when first displaing coordinate that is obtained and second displaing coordinate equate, according to described first displaing coordinate or second displaing coordinate, obtain and write down the true coordinate of input end in the input field of described input media, reset described present frame, return execution in step C;
When first displaing coordinate that is obtained and second displaing coordinate are unequal, obtain the person's handwriting of handwriting input according to input end each true coordinate in the input field of the described input media that is write down.
Described camera head is: camera, probe or monitor.
Also further comprise in the described steps A:
Adjust the shooting angle and/or the shooting distance of described camera head, make the input field of described handwriting input be positioned at fully within the coverage of described camera head.
Described step B comprises:
By the Boundary Recognition method, from the image information that described camera head absorbed, automatically identify the border of described input field, determine the input field of described handwriting input.
Described step B comprises:
The user determines four summits of the input field of described handwriting input by default affirmation mode in the image information that described camera head absorbed, thereby determines the input field of described handwriting input.
This method also further comprises:
One secondary light source is set, makes when using described input media to carry out handwriting input, with the input end of described input media clearly side projection in described input field.
Described step C comprises:
In the present frame that camera head absorbed, according to the position in the present frame of being projected in of the input end of the input end of described input media and input media, the input end that obtains described input media in described input field first displaing coordinate and the input end of described input media be projected in second displaing coordinate in the described input field.
The present frame that resets among the described step D comprises:
N frame after the present frame that described camera head absorbed is set at present frame; Described N is a natural number.
This method also further comprises:
The transmission frame number of described camera head is set in advance or dynamically according to handwriting input speed.
The person's handwriting that input end each true coordinate in the input field according to the described input media that is write down among the described step D obtains handwriting input comprises:
Sequencing according to writing time of described each true coordinate connects the represented point of each true coordinate with linear sequence, thereby obtains the person's handwriting of this user's handwriting input.
A kind of system of the handwriting input based on camera head also is provided in the embodiments of the invention, and this system comprises: input media, camera head, display device and treating apparatus;
Described input media is used for carrying out handwriting input in the coverage of described camera head;
Described camera head, the image information that is used for being absorbed sends to described display device and treating apparatus;
Described display device is used to the image information that shows that described camera head sends;
Described treating apparatus, the image information that is used for absorbing according to described camera head is determined the input field of handwriting input; In the present frame of the image information that camera head absorbed, the input end that obtains input media in described input field first displaing coordinate and the input end of this input media be projected in second displaing coordinate in the described input field; When first displaing coordinate that is obtained is equal with second displaing coordinate, according to described first displaing coordinate or second displaing coordinate, obtain and write down the true coordinate of input end in the input field of described input media, reset present frame; When first displaing coordinate that is obtained and second displaing coordinate are unequal, obtain the person's handwriting of handwriting input according to input end each true coordinate in the input field of the described input media that is write down.
As from the foregoing, the invention provides a kind of method and system of the handwriting input based on camera head, because in this method and system, do not need to use traditional handwriting input device, and only need set in advance a camera head, and obtain the content of user by handwriting input by the image information that set camera head absorbed, thereby when not using the traditional handwriting input media, also can realize user's handwriting input, thereby improved the simplicity of handwriting input greatly, reduce user's cost, improved user's Experience Degree.
Description of drawings
Fig. 1 is the process flow diagram based on the method for the handwriting input of camera head among the present invention.
Fig. 2 is the synoptic diagram of the input field of determined handwriting input among the present invention.
Fig. 3 is for obtaining the synoptic diagram of the true coordinate of input end in the input field of described input media among the present invention.
Fig. 4 is the synoptic diagram based on the system of the handwriting input of camera head among the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, below lift specific embodiment and, the present invention is described in more detail with reference to accompanying drawing.
Fig. 1 is the process flow diagram based on the method for the handwriting input of camera head among the present invention.As shown in Figure 1, the method based on the handwriting input of camera head among the present invention comprises step as described below:
In this step, can set in advance a camera head that can absorb distinct image information continuously according to practical situations, and this camera head is linked to each other with a display device, make this display device can show the image information that this camera head absorbs.In an embodiment of the present invention, above-mentioned camera head can be the apparatuss for making a video recording such as various cameras, probe or monitor that now generally use; Above-mentioned display device then can be to have the computing machine of display or other the display device that receives, handles and show the image information that above-mentioned camera head absorbs.For example, can set in advance a camera that links to each other with computing machine by USB interface, this computing machine can receive and handle the image information that this camera absorbs, and shows the image information that this camera absorbs by display.
In an embodiment of the present invention, the shooting angle of above-mentioned camera head and/or shooting distance can be adjusted according to practical situations, so that the input field of determined handwriting input is positioned within the coverage of described camera head fully in subsequent step.For example, when the input field of handwriting input is not also determined, this camera head can be arranged at the front upper place of the position that the input field of this handwriting input may occur, can cover the input field of determined handwriting input in the subsequent step with the coverage of guaranteeing described camera head fully.
In addition, for the ease of identification in the subsequent step or processing, parameters such as the resolution of the image information that above-mentioned camera head absorbed, transmission frame number should satisfy predefined standard.Concrete standard can be provided with in advance according to practical situations, and concrete set-up mode does not repeat them here.
In this step, can determine the input field of described handwriting input by the mode of automatic or manual according to the image information (for example, a plurality of frames that this camera head absorbed) that described camera head absorbed.For example, when above-mentioned input field be the known paper of length breadth ratio (for example, the A4 paper of standard) or other (for example have the regulation shape, rectangle) and can be for the laminar medium of user input the time, can be by Boundary Recognition method commonly used, the border that (for example, a certain frame in the described image information) automatically identifies above-mentioned input field from the image information that described camera head absorbed is (for example, the four edges of A4 paper and 4 summits), thus the input field of definite handwriting input.Again for example, when above-mentioned input field is that the known paper of length breadth ratio or other have the regulation shape and can be for the laminar medium of user's input the time, the user can be by default affirmation mode (for example, by modes such as clicks) in the image information that described camera head absorbed (for example, in a certain definite frame in the described image information) determine four summits of the input field of described handwriting input, thus determine the input field of described handwriting input.In an embodiment of the present invention, above-mentioned Boundary Recognition method, determine that by four summits the method in zone all can use the various common methods in this area, therefore repeat no more.
Fig. 2 is the synoptic diagram of the input field of determined handwriting input among the present invention.As shown in Figure 2, the input field 201 of described handwriting input is arranged in a certain frame 200 of the image information that described camera head absorbs, and four summits of this input field 201 are respectively A, B, C and D.Because the image information that camera head absorbed is a two dimensional image, and this camera head generally all is arranged at the front upper place of above-mentioned input field 201, therefore to be that the input field 201 of rectangle is shown as in Fig. 2 one trapezoidal for true form, that is to say, because shown input field is equivalent to the projection of input field in image information of actual handwriting input in the image information, therefore the shape of shown input field is different in the shape of the input field of actual handwriting input and the image information.
Behind the input field of determining handwriting input, can also be in above-mentioned image information (for example, in a certain definite frame), with a certain selected point in this image information (for example, some summits of this input field) be initial point, in this image information, set up displaing coordinate system, thereby make the every bit in the input field of above-mentioned handwriting input in this displaing coordinate system, all have definite displaing coordinate (i.e. the positional information of this point in above-mentioned image information).For example, as shown in Figure 2, be initial point, be transverse axis with AD, be that the longitudinal axis is set up a displaing coordinate system with summit A point in can a certain frame 200 in the image information that described camera head absorbed with straight line perpendicular to AD.The displaing coordinate system that sets up according to above-mentioned can obtain the displaing coordinate of every bit in this displaing coordinate is in the input field of above-mentioned handwriting input.For example, the displaing coordinate that A is ordered be the displaing coordinate that (0,0), B are ordered be (b1, b2), the C displaing coordinate of ordering be (c1, c2), the D displaing coordinate of ordering is (d1,0), or the like.Accordingly, can set up one in the plane at the place, input field of the handwriting input of reality is corresponding plane right-angle coordinate with above-mentioned displaing coordinate, for example, with above-mentioned displaing coordinate on image information be corresponding, can be in the plane at the place, input field of the handwriting input of reality, with summit A point be initial point, be transverse axis with AD, being that the longitudinal axis is set up a corresponding plane right-angle coordinate perpendicular to the straight line of AD (promptly by AB straight line), certain some the coordinate in this plane right-angle coordinate can be described as the true coordinate of this point.Hence one can see that, and each point in the input field of above-mentioned handwriting input all has a displaing coordinate and true coordinate.
Because the input field of the handwriting input shape in the image information that described camera head absorbed is also inequality with the true form of this input field, therefore some displaing coordinate in above-mentioned image information of certain in the above-mentioned input field might not equate (except the special point with the true coordinate of this point, for example, initial point), but owing to there is relation one to one between the true coordinate of the displaing coordinate of the every bit in the input field and this point, therefore according to this corresponding relation, and by using conversion method commonly used in the prior art, can obtain the true coordinate of this point according to certain any displaing coordinate.
In addition, after the input field of having determined above-mentioned handwriting input, under default situations, can directly enter the process of obtaining user's handwriting input person's handwriting as described below.And in specific embodiments of the invention, also can be after the input field of having determined above-mentioned handwriting input, do not enter the process of obtaining user's handwriting input person's handwriting as described below immediately, but after the user sends command adapted thereto (for example, the user clicks corresponding button or direct input instruction), enter the process of obtaining user's handwriting input person's handwriting as described below again.
Step 103, in the present frame of the image information that camera head absorbed, the input end that obtains input media in above-mentioned input field first displaing coordinate and the input end of this input media be projected in second displaing coordinate in the above-mentioned input field.
After the input field of having determined above-mentioned handwriting input, the user can carry out handwriting input by input media in the input field of determined handwriting input, thereby enters the process of obtaining user's handwriting input person's handwriting.In an embodiment of the present invention, described input media can be the instrument that any user of being convenient to imports the content of required input, and for example, above-mentioned input media can be various pen, or other be convenient to discern, an end is most advanced and sophisticated object.In addition, in an embodiment of the present invention, also (for example can set in advance a secondary light source, desk lamp, luminous indicator screen etc.), when making that stating input media in the use carries out handwriting input, can with the input end of this input media clearly side projection in above-mentioned input field, so that the projection of the input end of the input end of this input media and this input media is discerned; In addition, in actual applications, also can adjust the irradiating angle and/or the irradiation distance of above-mentioned secondary light source, make in follow-up process and can be simultaneously the projection of the input end of the input end of this input media and this input media to be discerned according to the shooting angle and/or the shooting distance of above-mentioned camera head.
Generally speaking, the image information that camera head obtained is made up of a plurality of continuous frames, and each frame wherein all can to regard as be a width of cloth still image.Therefore, in specific embodiments of the invention, can be according to the present frame of the image information that camera head absorbed, the input end that obtains input media (abbreviates input end as, down with) displaing coordinate in above-mentioned definite input field (can abbreviate first displaing coordinate as, down with), and the projection of the input end of this input media (abbreviates the input end projection as, down with) displaing coordinate in above-mentioned definite input field (can abbreviate second displaing coordinate as, down with).Wherein, described present frame be current required processing by picture frame that above-mentioned camera head absorbed.When execution in step 102 first, described present frame is first frame that this camera head is absorbed after the process that enters the described user's of obtaining handwriting input person's handwriting.
Specifically, in this step, can be in the present frame that camera head absorbed, be projected in position in the present frame according to input end and input end, obtain first displaing coordinate and the input end of above-mentioned input end in above-mentioned input field and be projected in second displaing coordinate in the above-mentioned input field.For example, in specific embodiments of the invention, can from described present frame, automatically identify above-mentioned input end and input end projection, be projected in position in the present frame thereby can obtain this input end and input end by automatic identifying method commonly used.Because above-mentioned input field is positioned within the coverage of described camera head fully, therefore above-mentioned input field must be positioned within the present frame, and the displaing coordinate of the every bit in the promptly above-mentioned input field is all inevitable corresponding to a position in the present frame.So, be projected under the situation of the position in the present frame at known this input end and input end, then can be projected in position in the present frame according to described input end and input end, obtain this input end and input end and be projected in displaing coordinate in the above-mentioned input field.
In this step, need at first to judge whether first displaing coordinate and second displaing coordinate that are obtained equate, when first displaing coordinate that is obtained is equal with second displaing coordinate, the input end of then representing described input media overlaps with the projection of the input end of this input media, this moment this input media the plane at the inevitable place, input field that fall into above-mentioned handwriting input of input end in, therefore can judge that the user has begun handwriting input, at this moment, can carry out input end the true coordinate input field in of follow-up step 105 to obtain and to write down input media; And work as first displaing coordinate that obtained and second displaing coordinate when unequal, the input end of then representing input media does not overlap with the projection of the input end of input media, this moment, the input end of input media did not fall on the plane at place, input field of above-mentioned handwriting input, therefore, direct execution in step 107.
The true coordinate of input end in the input field of described input media obtained and write down to step 105 according to described first displaing coordinate or second displaing coordinate.
By as can be known shown in Figure 2, because the shape of the input field in the image information that picture pick-up device absorbed and the true form of this input field and inequality, therefore, the displaing coordinate of the every bit in this input field is general and be not equal to this actual coordinate in the input field, but is certainly existing relation one to one between the actual coordinate of the displaing coordinate of every bit and this point.Therefore, according to certain some displaing coordinate in the input field, must obtain this actual coordinate in the input field.
In this step, because first displaing coordinate and second displaing coordinate are known and equal, therefore, according to the first above-mentioned displaing coordinate or second displaing coordinate, by using conversion method commonly used in this area, can obtain the true coordinate of input end in the input field of described input media.
Fig. 3 is for obtaining the synoptic diagram of the true coordinate of input end in the input field of described input media among the present invention.Figure 3 shows that example, in specific embodiments of the invention, can be according to described first displaing coordinate or second displaing coordinate, and obtain the true coordinate of input end in the input field of described input media by conversion method as described below.
As shown in Figure 3, establish four summit A1, B1 of input field 201, the displaing coordinate of C1, D1 is respectively: (X1, Y1), (X2, Y2), (X3, Y3) and (X4, Y4), the displaing coordinate of auxiliary point E1, F1 is respectively (X5, Y5) and (X6, Y6), the displaing coordinate (i.e. first displaing coordinate) of the input end O of described input media in the input field be (X, Y), the true coordinate of input end O in the input field of described input media be (x, y).Wherein, A1, E1, D1 three point on a straight line, B1, F1, C1 three point on a straight line, and E1, O, F1 three point on a straight line.
Because it is known that X1, Y1, X2, Y2, X3, Y3, X4, Y4, X, Y are, and X5, Y5, X6 and Y6 be intermediate quantity, therefore can set up system of equations as described below:
a)
b)
c)
d)
Can get according to above-mentioned system of equations:
Wherein, L is when determining the input field of described handwriting input, and the true altitude of predefined input field (or being called physical length) is used to represent the precision of handwriting input.For example, when the resolution of described camera head is VGA (640 * 480), can be according to the coverage and the angle of this camera head reality, the value of L is made as 320, promptly the true altitude of this input field (or physical length) is 320; And when the resolution of described camera head is SXGA (1280 * 1024), the value of L can be made as 800, promptly the true altitude of this input field (or physical length) is 800.In an embodiment of the present invention, the value of described L can be determined according to the resolution or the experience preset value of described camera head, also can be determined voluntarily by the user, but the value of set L be not more than the height of the resolution of described camera head.
In like manner, can according to the above-mentioned identical method of value of obtaining y, obtain the value of another true coordinate x of above-mentioned input end O, thus obtain the true coordinate of input end O in the input field (x, y).At this moment, can set in advance a developed width W who is used to represent the input field of described handwriting input, W also can be definite according to the resolution or the experience preset value of described camera head, or determined voluntarily by the user, but the value of set W is not more than the width of the resolution of described camera head.Therefore, after the value of above-mentioned L and W was set, the size of this input field was (W * L).
Above-described conversion method in an embodiment of the present invention, also can obtain the true coordinate of input end in the input field of described input media by conversion method commonly used in other this area only for exemplarily describing.
Step 106 resets described present frame, returns execution in step 103;
In this step, can directly the N frame after the present frame that described camera head absorbed be set at present frame, and return execution in step 103.Wherein, N is a natural number, and the value of N can set in advance according to practical situations.For example, can establish N=1, the next frame that is about to the present frame that described camera head absorbs is set to present frame.
In actual applications, the transmission frame number of camera head is generally 30 frame/seconds or 60 frame/seconds, even has higher transmission frame number (for example, 120 frame/seconds), and user's handwriting input speed is then relatively slow.Therefore, in an embodiment of the present invention, the transmission frame number of camera head can be set in advance or dynamically according to handwriting input speed.For example, when user's handwriting input speed when very fast, can be provided with the transmission frame number of camera head bigger (for example, 60 frame/seconds or bigger); And when user's handwriting input speed is slow, then can be provided with the transmission frame number of camera head smaller (for example, 15 frame/seconds or littler).
Step 107 obtains the person's handwriting of handwriting input according to the input end of the described input media that is write down each true coordinate in the input field.
In an embodiment of the present invention, when the user begins input or (for example imports content corresponding continuously, import a certain stroke) time, the employed input media of this user must fall in the plane at place, above-mentioned input field, this moment, the input end of input media must overlap with the projection of this input end, and promptly above-mentioned first displaing coordinate that obtains and second displaing coordinate equate; (for example also do not begin input or finished a certain input continuously and work as the user, finish the input of a certain stroke) time, the employed input media of this user will leave the plane at place, above-mentioned input field, this moment, the input end of input media must not overlap with the projection of this input end, and promptly above-mentioned first displaing coordinate that obtains and second displaing coordinate are unequal.
Therefore, in an embodiment of the present invention, have only and work as first displaing coordinate that obtained and second displaing coordinate when unequal, just can carry out this step.And in this step, can obtain the person's handwriting of handwriting input according to above-mentioned each true coordinate that writes down by using disposal route commonly used in this area.For example, the sequencing according to writing time of each true coordinate connects the represented point of each true coordinate with linear sequence, then can obtain the person's handwriting of this user's handwriting input.Certainly, in an embodiment of the present invention, also can be by person's handwriting acquisition methods commonly used in other this area, obtain the person's handwriting of users' handwriting input according to the above-mentioned a plurality of true coordinate that write down, do not repeat them here.
In an embodiment of the present invention, when carrying out this step, the number of the true coordinate of the input end of the described input media that is write down in the input field may be 0, one or more.For example, when the number of the true coordinate that is write down is 0, then represent the also content of not input reality of user, promptly the person's handwriting of user's handwriting input is empty; When the number of the true coordinate that is write down was 1, the person's handwriting of then representing user's handwriting input was a point; And the number of working as the true coordinate that is write down is when being a plurality of, then be illustrated in before the execution in step 107, the input end of the employed input media of user has taken place to move continuously in the input field, thereby finished the input of a stroke, promptly the person's handwriting of this user's handwriting input is a stroke, for example, the person's handwriting of this user's handwriting input is a certain stroke in some Chinese characters, numeral, English alphabet or other symbol.
Hence one can see that, in an embodiment of the present invention, the user is made up of one or more strokes by the content of described input media handwriting input, for example, the user can come input digit " 3 " by a stroke of input " 3 ", and also can be by importing two strokes successively: the mode of " " and " Shu " be imported Chinese character " ten ", also can import English capitalization " H " by the mode of importing three strokes " Shu ", " one " and " Shu " successively, or the like, and can the rest may be inferred.
Therefore, when the user passes through the content of input media handwriting input reality, can obtain each stroke of this user's handwriting input by above-mentioned step 103～107.And after all strokes of having obtained this user's handwriting input, then can judge the content of the reality of user's handwriting input by determination methods commonly used in this area, for example, what judge user's handwriting input is which Chinese character, numeral, English alphabet or other symbol etc.Because concrete determination methods does not belong to the part of required protection in the technical scheme of the present invention, does not repeat them here.
As from the foregoing,, finally can obtain the person's handwriting of user's handwriting input, thereby obtain the content of user's handwriting input by above-mentioned step 101～107.Therefore, in the method for above-mentioned handwriting input based on camera head, do not need to use traditional handwriting input device, and only need set in advance a camera head, and obtain the content of user by handwriting input by the image information that set camera head absorbed.And, above-mentioned camera head can directly use the camera head various commonly used that is widely used in the daily life (for example, it is first-class to make a video recording), and the input field that the user carries out handwriting input also can only be the blank sheet of paper that a shape meets respective rule, thereby when not using extra traditional handwriting input media, also can realize user's handwriting input, thereby improve the simplicity of handwriting input greatly, reduce user's cost, improved user's Experience Degree.
In addition, in an embodiment of the present invention, also provide a kind of system of the handwriting input based on camera head.Fig. 4 is the synoptic diagram based on the system of the handwriting input of camera head among the present invention.As shown in Figure 4, the system based on the handwriting input of camera head among the present invention comprises: input media 401, camera head 402, display device 403 and treating apparatus 404.
Described input media 401 is used for carrying out handwriting input in the coverage of described camera head;
Described camera head 402, the image information that is used for being absorbed send to described demonstration and adorn 403 and put and treating apparatus 404;
Described display device 403 is used to the image information that shows that described camera head 402 sends;
Described treating apparatus 404 is used for determining according to the image information that described camera head 402 is absorbed the input field of handwriting input; In the present frame of the image information that camera head 402 is absorbed, the input end that obtains input media 401 in above-mentioned input field first displaing coordinate and the input end of this input media 401 be projected in second displaing coordinate in the above-mentioned input field; When first displaing coordinate that is obtained is equal with second displaing coordinate, according to described first displaing coordinate or second displaing coordinate, obtain and write down the true coordinate of input end in the input field of described input media 401, reset present frame; When first displaing coordinate that is obtained and second displaing coordinate are unequal, obtain the person's handwriting of handwriting input according to input end each true coordinate in the input field of the described input media 401 that is write down.
In summary, the invention provides a kind of method and system of the handwriting input based on camera head, because in this method and system, do not need to use traditional handwriting input device, and only need set in advance a camera head, and obtain the content of user by handwriting input by the image information that set camera head absorbed, therefore can be when not using the traditional handwriting input media, also can realize user's handwriting input, thereby can improve the simplicity of handwriting input greatly, reduce user's cost, improve user's Experience Degree.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the method based on the handwriting input of camera head is characterized in that, this method comprises:
A, a camera head is set, this camera head shows the image information that this camera head absorbs by connected display device;
B, determine the input field of handwriting input according to the image information that camera head absorbed;
C, in the present frame of the image information that described camera head absorbed, the input end that obtains input media in described input field first displaing coordinate and the input end of this input media be projected in second displaing coordinate in the described input field;
D, when first displaing coordinate that is obtained and second displaing coordinate equate, according to described first displaing coordinate or second displaing coordinate, obtain and write down the true coordinate of input end in the input field of described input media, reset described present frame, return execution in step C;
When first displaing coordinate that is obtained and second displaing coordinate are unequal, obtain the person's handwriting of handwriting input according to input end each true coordinate in the input field of the described input media that is write down.
2. method according to claim 1 is characterized in that, described camera head is: camera, probe or monitor.
3. method according to claim 1 is characterized in that, also further comprises in the described steps A:
Adjust the shooting angle and/or the shooting distance of described camera head, make the input field of described handwriting input be positioned at fully within the coverage of described camera head.
4. method according to claim 1 is characterized in that, described step B comprises:
By the Boundary Recognition method, from the image information that described camera head absorbed, automatically identify the border of described input field, determine the input field of described handwriting input.
5. method according to claim 1 is characterized in that, described step B comprises:
The user determines four summits of the input field of described handwriting input by default affirmation mode in the image information that described camera head absorbed, thereby determines the input field of described handwriting input.
6. method according to claim 1 is characterized in that, this method also further comprises:
One secondary light source is set, makes when using described input media to carry out handwriting input, with the input end of described input media clearly side projection in described input field.
7. method according to claim 1 is characterized in that, described step C comprises:
In the present frame that camera head absorbed, according to the position in the present frame of being projected in of the input end of the input end of described input media and input media, the input end that obtains described input media in described input field first displaing coordinate and the input end of described input media be projected in second displaing coordinate in the described input field.
8. method according to claim 1 is characterized in that, the present frame that resets among the described step D comprises:
N frame after the present frame that described camera head absorbed is set at present frame; Described N is a natural number.
9. method according to claim 1 is characterized in that, this method also further comprises:
The transmission frame number of described camera head is set in advance or dynamically according to handwriting input speed.
10. method according to claim 1 is characterized in that, the person's handwriting that input end each true coordinate in the input field according to the described input media that is write down among the described step D obtains handwriting input comprises:
Sequencing according to writing time of described each true coordinate connects the represented point of each true coordinate with linear sequence, thereby obtains the person's handwriting of this user's handwriting input.
11. the system based on the handwriting input of camera head is characterized in that, this system comprises: input media, camera head, display device and treating apparatus;
Described input media is used for carrying out handwriting input in the coverage of described camera head;
Described camera head, the image information that is used for being absorbed sends to described display device and treating apparatus;
Described display device is used to the image information that shows that described camera head sends;
Described treating apparatus, the image information that is used for absorbing according to described camera head is determined the input field of handwriting input; In the present frame of the image information that camera head absorbed, the input end that obtains input media in described input field first displaing coordinate and the input end of this input media be projected in second displaing coordinate in the described input field; When first displaing coordinate that is obtained is equal with second displaing coordinate, according to described first displaing coordinate or second displaing coordinate, obtain and write down the true coordinate of input end in the input field of described input media, reset present frame; When first displaing coordinate that is obtained and second displaing coordinate are unequal, obtain the person's handwriting of handwriting input according to input end each true coordinate in the input field of the described input media that is write down.
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