CN114241090B - OCR-based electronic whiteboard straight line drawing method, system, equipment and medium - Google Patents
OCR-based electronic whiteboard straight line drawing method, system, equipment and medium Download PDFInfo
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- CN114241090B CN114241090B CN202111661183.8A CN202111661183A CN114241090B CN 114241090 B CN114241090 B CN 114241090B CN 202111661183 A CN202111661183 A CN 202111661183A CN 114241090 B CN114241090 B CN 114241090B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/20—Drawing from basic elements, e.g. lines or circles
- G06T11/203—Drawing of straight lines or curves
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Abstract
The invention discloses an electronic whiteboard linear drawing method, system, equipment and medium based on OCR, wherein the linear drawing method comprises the following steps: acquiring hand-drawn handwriting, and identifying and determining a target line segment through character symbols; acquiring a width and height parameter of a target line segment, and determining a starting point coordinate and an end point coordinate; and drawing a connecting line based on the starting point coordinate and the end point coordinate to obtain a hand-drawn straight line image. The method and the device have the advantages that linear graph recognition is carried out on the hand-drawn handwriting through OCR character recognition, and then the end points of the drawn straight line are corrected through the rectangular object to achieve the scheme of intelligent hand-drawn straight line, so that the drawn straight line is more accurate, meanwhile, the threshold is lower, the intelligent operation sense can be brought to a user, and the user experience is improved.
Description
Technical Field
The invention relates to the field of electronic whiteboard image drawing, in particular to an OCR-based electronic whiteboard linear drawing method, system, equipment and medium.
Background
At present, the method for drawing a straight line in the electronic whiteboard currently is that a user selects a starting point and an end point on the whiteboard when the electronic whiteboard is in a specific straight line graph mode, and a system automatically connects the two points so as to draw a corresponding straight line; however, when a user wants to draw a straight line in the writing mode process, the mode needs to be switched, the user experience is not smooth enough, and certain use limitations exist.
The method for drawing the straight line can also be that in a specific straight line graph mode, a user draws a straight line on a white board, and the system directly takes the starting point and the terminal position of the drawn line as the coordinates of the starting point and the terminal point of the straight line and then generates the corresponding straight line. However, the starting point and the ending point of the drawn handwriting may be curved, so that the finally generated straight line position does not correspond to the straight line position drawn by the user, and the user is required to adjust the straight line position twice, which affects the user experience.
Disclosure of Invention
In order to overcome the defects in the prior art, one of the purposes of the present invention is to provide an electronic whiteboard straight line drawing method based on OCR, which can improve the accuracy of straight line drawing and improve the user experience.
The invention also aims to provide an electronic whiteboard straight line drawing system based on the OCR.
It is a further object of the present invention to provide an electronic device.
It is a fourth object of the present invention to provide a storage medium.
One of the purposes of the invention is realized by adopting the following technical scheme:
an electronic whiteboard straight line drawing method based on OCR comprises the following steps:
acquiring hand-drawn handwriting, and identifying and determining a target line segment through character symbols;
acquiring width and height parameters of an area where a target line segment is located, and determining a starting point coordinate and an end point coordinate;
and performing connection drawing based on the starting point coordinates and the end point coordinates to obtain a hand-drawn linear image.
Further, the hand-drawn handwriting is obtained in response to a touch event; the touch event comprises a press-down event and a lift-up event associated with the press-down event, and the method further comprises the following steps when recording the touch event:
judging whether a new press-down event is received within preset time after the lift-up event is executed currently; if not, recording the lift-off event and the hand-drawn handwriting drawn during the press-down event associated with the lift-off event to obtain a complete touch event; and if a new pressing event is received, continuously recording the hand-drawn handwriting until a new lifting event is obtained, and fusing the new lifting event and the hand-drawn handwriting drawn during the previous pressing event to obtain a complete touch event.
Furthermore, the hand-drawn handwriting comprises X-axis coordinate data and Y-axis coordinate data of the touch event, and OCR character symbol recognition is performed on the coordinate data to obtain character symbols corresponding to the hand-drawn handwriting.
Further, the method for determining the target line segment comprises the following steps:
and judging whether the comparison similarity between the result of the hand-drawn handwriting after the character symbol recognition and a preset straight line model is greater than or equal to a threshold value, if so, marking the hand-drawn handwriting as a target line segment.
Further, the width and height parameters are obtained by constructing a rectangular object, and specifically include:
carrying out coordinate comparison on X-axis coordinate data of the hand-drawn handwriting to obtain a leftmost end coordinate and a rightmost end coordinate on an X axis, and correcting the left side and the right side of the constructed rectangular object to enable the left side of the rectangular object to be intersected with the leftmost end coordinate and the right side of the rectangular object to be intersected with the rightmost end coordinate;
carrying out coordinate comparison on Y-axis coordinate data of the hand-drawn handwriting to obtain the uppermost coordinate and the lowermost coordinate on the Y axis, and correcting the upper side and the lower side of the same rectangular object to enable the upper side of the rectangular object to be intersected with the uppermost coordinate and the lower side of the rectangular object to be intersected with the lowermost coordinate;
and acquiring the width and height parameters of the rectangular object according to the corrected vertex position of the rectangular object.
Further, the method for determining the coordinates of the starting point and the ending point comprises the following steps:
determining the direction of the straight line hand-drawing according to the width and height parameters of the corrected rectangular object;
if the straight-line hand-drawing direction is transverse, marking the leftmost end coordinate and the rightmost end coordinate of the target line segment as a starting point coordinate and an end point coordinate respectively;
and if the straight-line hand-drawing direction is longitudinal, respectively marking the uppermost end coordinate and the lowermost end coordinate of the target line segment as a starting point coordinate and an end point coordinate.
Further, the method for determining the direction of the straight line according to the width and height parameters of the corrected rectangular object comprises the following steps:
if the width value of the rectangular object is larger than the height value, the straight line is judged to be the transverse hand-drawing direction;
and if the height value of the rectangular object is larger than the width value, judging that the straight line is the longitudinal hand-drawing direction.
The second purpose of the invention is realized by adopting the following technical scheme:
an OCR-based electronic whiteboard straight line drawing system for executing the OCR-based electronic whiteboard straight line drawing method comprises the following steps:
the handwriting recognition module is used for acquiring hand-drawn handwriting and identifying and determining a target line segment through character symbols;
the coordinate correction module is used for acquiring width and height parameters of an area where the target line segment is located and determining a starting point coordinate and an end point coordinate;
and the straight line drawing module is used for drawing a connecting line based on the starting point coordinate and the end point coordinate to obtain a hand-drawn straight line image.
The third purpose of the invention is realized by adopting the following technical scheme:
an electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the processor implementing the OCR-based electronic whiteboard straight drawing method as described above when executing the computer program.
The fourth purpose of the invention is realized by adopting the following technical scheme:
a storage medium having stored thereon a computer program which, when executed, implements the OCR-based electronic whiteboard straight drawing method described above.
Compared with the prior art, the invention has the beneficial effects that:
the method and the device have the advantages that linear graph recognition is carried out on the hand-drawn handwriting through OCR character recognition, and then the end points of the drawn straight line are corrected through the rectangular object so as to realize the scheme of intelligent hand-drawn straight line, so that the drawn straight line is more accurate, meanwhile, the threshold is lower, the intelligent operation feeling can be brought to a user, and the user experience is improved.
Drawings
Fig. 1 is a schematic flow chart of an OCR-based electronic whiteboard straight line drawing method according to the present invention;
FIG. 2 is a schematic diagram of hand-drawn handwriting in the transverse direction of the present invention;
FIG. 3 is a schematic diagram of the hand-drawn handwriting in the longitudinal direction of the present invention;
fig. 4 is a schematic block diagram of an OCR-based electronic whiteboard straight line drawing system according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example one
This implementation provides an electronic whiteboard straight line drawing method based on OCR, and this embodiment compares in the current straight line drawing scheme of electronic whiteboard, through carrying out sharp figure recognition to the hand-drawn handwriting with the help of OCR character recognition, and the scheme of rethread correction algorithm drawing realization intelligence hand-drawn straight line realizes that the threshold is lower to can bring for user's intelligent operation sense, promote user experience.
As shown in fig. 1, the electronic whiteboard straight line drawing method of this embodiment specifically includes the following steps:
step S1: generating corresponding hand-drawn handwriting in response to the touch event, performing character symbol recognition on the hand-drawn handwriting, and marking character symbols meeting preset conditions as target line segments;
step S2: establishing a rectangular object, updating the vertex position of the rectangular object according to the hand-drawn handwriting to obtain the width and height parameters of the updated rectangular object, re-determining the starting point coordinate and the end point coordinate of the target line segment according to the width and height parameters, and performing connection drawing on the starting point coordinate and the end point coordinate to display the hand-drawn linear image.
The touch event comprises a press-down event and a lift-up event, and a corresponding lift-up event is generated after the press-down event is generated, so that the press-down event and the lift-up event generated after the touch operation of the press-down and the lift-up are associated to form a complete touch event.
Recording the X-axis coordinate and the Y-axis coordinate of the event in real time after receiving the press event; when the touch event is recorded, whether a new press-down event is received within preset time after the lift-up event is executed currently needs to be judged; if not, the current touch operation is finished, and the lift-off event and the hand-drawn handwriting drawn during the press-down event associated with the lift-off event are recorded to obtain a complete touch event; and if a new press-down event corresponding to the next touch operation is received within the preset time, continuing to record the hand-drawn handwriting until a new lift-up event is obtained, and fusing the new lift-up event and the hand-drawn handwriting drawn during the press-down event of the previous touch operation to obtain a complete touch event. If the coordinate points of the lifting event of the previous touch operation and the pressing event of the next touch operation are not consistent, automatically connecting the coordinate points of the lifting event of the previous touch operation and the pressing event of the next touch operation.
After the hand-drawn handwriting is recorded, X-axis coordinate data and Y-axis coordinate data of a touch event can be obtained, and then the recorded coordinate data is transmitted to an SDK tool of OCR character symbols for recognition so as to obtain a character symbol result corresponding to the hand-drawn handwriting; in addition, the OCR character recognition SDK can be replaced by an SDK which can recognize characters or symbols with similar straight lines by different platforms.
And comparing the character symbol recognition result obtained by recognition with a preset linear model, wherein the preset linear model comprises a large number of character symbols similar to the linear handwriting, if the similarity between the character symbol recognition result obtained by recognition and any character symbol in the preset linear model is greater than or equal to a threshold value, the preset condition is met, at the moment, the fact that the user draws the straight line at this time can be judged, and the hand-drawn handwriting can be marked as a target line segment.
Considering that the starting and ending positions of the handwriting may be slightly curved, as shown in fig. 2 and 3, the starting and ending positions of the handwriting cannot be used simply as the two ends of the straight line. In order to draw a straight line close to the handwriting more accurately, after the recognition result of the hand-drawn handwriting confirms that the straight line is the straight line, the straight line is corrected and drawn, and the flow is as follows:
establishing a rectangular object, wherein the original size of the rectangular object can be any size or a fixed size;
carrying out coordinate comparison on X-axis coordinate data of the hand-drawn handwriting so as to obtain a leftmost end coordinate and a rightmost end coordinate on an X axis, and carrying out offset correction on the left side and the right side of the rectangular object so that the left side of the rectangular object is intersected with the leftmost end coordinate and the right side of the rectangular object is intersected with the rightmost end coordinate;
carrying out coordinate comparison on Y-axis coordinate data of the hand-drawn handwriting to obtain the uppermost coordinate and the lowermost coordinate on the Y axis, and carrying out offset correction on the upper side and the lower side of the rectangular object to enable the upper side of the rectangular object to be intersected with the uppermost coordinate and the lower side of the rectangular object to be intersected with the lowermost coordinate;
the above-mentioned process of correcting the left and right sides and the upper and lower sides of the rectangular object can be performed simultaneously;
the corrected rectangular object is the largest rectangular area intersected with the handwriting path, and the width and height parameters of the rectangular object are obtained according to the coordinates of four vertexes of the corrected rectangular object, are equivalent to the width and height parameters of the area where the target line segment is located, and specifically refer to a height value and a width value.
Judging the hand-drawing direction of the straight line according to the height value and the width value of the rectangular object, thereby obtaining the starting point coordinate and the end point coordinate of the straight line; the method for judging the direction of the linear freehand drawing comprises the following steps: on the premise that the hand-drawn handwriting recognition result is a straight line, if the width value of the rectangular handwriting area is greater than the height value, as shown in fig. 2, the straight line can be judged to be transversely hand-drawn; conversely, as shown in fig. 3, if the height of the rectangular object is greater than the width, it can be determined that the straight line is vertically hand-drawn.
If the straight-line hand-drawing direction is transverse, marking the leftmost coordinate and the rightmost coordinate of the target line segment as a starting point coordinate and an end point coordinate respectively; if the straight-line hand-drawing direction is longitudinal, respectively marking the uppermost end coordinate and the lowermost end coordinate of the target line segment as a starting point coordinate and an end point coordinate; and then, connecting the obtained start point coordinate and the end point coordinate by using a Canvas primitive method, thereby drawing a straight line close to the freehand handwriting.
When the coordinates of the starting point and the coordinates of the end point are determined, the time stamp of each coordinate point can be considered, namely, when a user generates one coordinate point during drawing, the time stamp corresponding to the coordinate point is generated according to the drawing time; after the straight line hand-drawing direction is judged, the starting point coordinate and the end point coordinate are determined by combining the time stamp of the coordinate point, so that the drawing direction of the straight line is distinguished, and the straight line is conveniently displayed or identified.
Example two
The embodiment provides an OCR-based electronic whiteboard linear drawing system, which executes the OCR-based electronic whiteboard linear drawing method according to the first embodiment, and as shown in fig. 4, the OCR-based electronic whiteboard linear drawing system includes:
the event recording module is used for acquiring a touch event and generating corresponding hand-drawn handwriting;
the handwriting recognition module is used for acquiring the hand-drawn handwriting, performing character symbol recognition on the hand-drawn handwriting and marking the character symbols meeting the preset conditions as target segments;
the coordinate correction module is used for establishing a rectangular object and updating the vertex position of the rectangular object according to the hand-drawn handwriting so as to obtain the width and height parameters of the updated rectangular object;
and the straight line drawing module is used for re-determining the start point coordinates and the end point coordinates of the target line segment according to the width and height parameters, and connecting and drawing the start point coordinates and the end point coordinates to display the hand-drawn straight line image.
In addition, the present embodiment also provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, where the processor implements the OCR-based electronic whiteboard straight line drawing method in the first embodiment when executing the computer program; in addition, the present embodiment also provides a computer-readable storage medium, on which a computer program is stored, which when executed, implements the above-mentioned OCR-based electronic whiteboard straight line drawing method.
The system, the device and the storage medium in this embodiment are based on two aspects of the same inventive concept, and the method implementation process has been described in detail in the foregoing, so that those skilled in the art can clearly understand the structure and implementation process of the system, the device and the storage medium in this embodiment according to the foregoing description, and for the sake of brevity of the description, no further description is provided here.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (7)
1. An electronic whiteboard straight line drawing method based on OCR is characterized by comprising the following steps:
acquiring hand-drawn handwriting, and identifying and determining a target line segment through character symbols;
acquiring width and height parameters of an area where a target line segment is located, and determining a starting point coordinate and an end point coordinate;
performing connection line drawing based on the starting point coordinate and the end point coordinate to obtain a hand-drawn linear image;
the width and height parameters are obtained by constructing a rectangular object, and specifically comprise the following steps:
carrying out coordinate comparison on X-axis coordinate data of the hand-drawn handwriting to obtain a leftmost end coordinate and a rightmost end coordinate on an X axis, and correcting the left side and the right side of the constructed rectangular object to enable the left side of the rectangular object to be intersected with the leftmost end coordinate and the right side of the rectangular object to be intersected with the rightmost end coordinate;
carrying out coordinate comparison on Y-axis coordinate data of the hand-drawn handwriting to obtain the uppermost coordinate and the lowermost coordinate on the Y axis, and correcting the upper side and the lower side of the same rectangular object to enable the upper side of the rectangular object to be intersected with the uppermost coordinate and the lower side of the rectangular object to be intersected with the lowermost coordinate;
acquiring a width and height parameter of the rectangular object according to the corrected vertex position of the rectangular object;
obtaining the hand-drawn handwriting in response to a touch event; the touch event comprises a press-down event and a lift-off event associated with the press-down event, and the method further comprises the following steps when recording the touch event:
judging whether a new press-down event is received within preset time after the lift-up event is executed currently; if not, recording the lift-off event and the hand-drawn handwriting drawn during the press-down event associated with the lift-off event so as to obtain a complete touch event; if a new pressing event is received, continuously recording the hand-drawn handwriting until a new lifting event is obtained, and fusing the new lifting event and the hand-drawn handwriting drawn during the previous pressing event to obtain a complete touch event;
the hand-drawn handwriting comprises X-axis coordinate data and Y-axis coordinate data of a touch event, and OCR character symbol recognition is carried out on the coordinate data to obtain character symbols corresponding to the hand-drawn handwriting.
2. An OCR-based electronic whiteboard straight drawing method according to claim 1, wherein the method for determining the target line segment is:
and judging whether the comparison similarity between the result of the hand-drawn handwriting after the character symbol recognition and a preset straight line model is greater than or equal to a threshold value, if so, marking the hand-drawn handwriting as a target line segment.
3. An OCR-based electronic whiteboard straight line drawing method according to claim 1, wherein the method for determining the start point coordinates and the end point coordinates is:
determining the direction of the straight line hand-drawing according to the width and height parameters of the corrected rectangular object;
if the straight-line hand-drawing direction is transverse, marking the leftmost end coordinate and the rightmost end coordinate of the target line segment as a starting point coordinate and an end point coordinate respectively;
and if the straight-line hand-drawing direction is longitudinal, respectively marking the uppermost end coordinate and the lowermost end coordinate of the target line segment as a starting point coordinate and an end point coordinate.
4. An OCR-based electronic whiteboard straight line drawing method according to claim 3, wherein the method for determining the straight line direction according to the corrected width and height parameters of the rectangular object is:
if the width value of the rectangular object is larger than the height value, the straight line is judged to be the transverse hand-drawing direction;
and if the height value of the rectangular object is greater than the width value, judging that the straight line is in the longitudinal hand-drawing direction.
5. An OCR-based electronic whiteboard linear drawing system, characterized by executing the OCR-based electronic whiteboard linear drawing method according to any one of claims 1~4, comprising:
the handwriting recognition module is used for acquiring the hand-drawn handwriting and determining a target line segment through character symbol recognition;
the coordinate correction module is used for acquiring width and height parameters of an area where the target line segment is located and determining a starting point coordinate and an end point coordinate;
and the straight line drawing module is used for drawing a connecting line based on the starting point coordinate and the end point coordinate to obtain a hand-drawn straight line image.
6. An electronic device comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, wherein the processor implements the OCR based electronic whiteboard straight drawing method of any one of claims 1~4 when executing the computer program.
7. A computer-readable storage medium having stored thereon a computer program which, when executed, implements the OCR-based electronic whiteboard straight line drawing method of any of claims 1~4.
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