CN103903000B - method and system for identifying target object from background - Google Patents
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- CN103903000B CN103903000B CN201210591173.6A CN201210591173A CN103903000B CN 103903000 B CN103903000 B CN 103903000B CN 201210591173 A CN201210591173 A CN 201210591173A CN 103903000 B CN103903000 B CN 103903000B
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Abstract
The invention discloses methods and systems for identifying a target object from a background, wherein the method comprises the steps of acquiring image information by an image acquisition unit for acquiring a display image of a display unit, adjusting the brightness of the image, acquiring second image information of the display unit by the image acquisition unit, and determining the position of the object on the display unit according to image information and the second image information.
Description
Technical Field
The invention relates to the field of object positioning, in particular to methods and systems for identifying target objects from backgrounds.
Background
With the continuous development of electronic devices, the usage of electronic devices is more and more diversified. In the prior art, a new use mode is provided for electronic equipment with a display unit.
The electronic equipment with the display unit can be a tablet personal computer, a mobile phone or other electronic equipment with a screen, and the tablet personal computer is taken as an example to be explained below.
In the prior art, the position determination method for dice mainly includes: the method comprises the steps of obtaining image information containing dice, processing a part of the image information, the brightness of which is larger than a preset threshold value, into white, and processing a part of the image information, the brightness of which is smaller than the preset threshold value, into black. The black parts are then identified as dice.
However, since the image displayed by the display unit of the electronic device is changed, the brightness change range of the image information acquired by the camera is also large, and when the image itself contains more areas with brightness smaller than the preset threshold, the position of the object cannot be accurately identified by the object position determining method above the display unit in the prior art.
Disclosure of Invention
The invention aims to provide methods and systems for identifying a target object from a background, which can eliminate the interference of the brightness of a display unit on an object position determination process, thereby accurately determining the position of the object above the display unit.
In order to achieve the purpose, the invention provides the following scheme:
A method for identifying a target object from a background, the method being applied to an electronic device having an image capturing unit, the method comprising:
acquiring an image of the target object in the background through the image acquisition unit to acquire th image information;
adjusting an optical parameter;
acquiring second image information of the target object in the background through the image acquisition unit;
and identifying the target object from the background according to the th image information and the second image information.
Optionally, the adjusting the optical parameter is adjusting the optical parameter of the background.
Optionally, the target object takes a display unit as the background;
the adjusting the optical parameter includes: adjusting an optical parameter of the display unit.
Optionally, the identifying the target object from the background includes:
acquiring optical parameters of the th image information and optical parameters of the second image information;
identifying th areas of the two image information, wherein the optical parameter change is smaller than a preset threshold value;
determining the th area as the target object.
Optionally, the identifying the target object from the background includes:
acquiring optical parameters of the th image information and optical parameters of the second image information;
identifying a second area of the two image information, wherein the change of the optical parameter is greater than a preset threshold value;
and determining the residual area excluding the second area in the image information as the target object.
Optionally, the adjusting the optical parameter of the image includes:
increasing an optical parameter of the image;
alternatively, the optical parameters of the image are reduced.
Optionally, the method further includes:
identifying whether an optical parameter of the image is in an th optical parameter range or a second optical parameter range, an optical parameter value in the th optical parameter range being less than an optical parameter value in the second optical parameter range;
performing the step of increasing the optical parameter of the image when the brightness of the image is in the th optical parameter range;
when the brightness of the image is in the second optical parameter range, the step of reducing the optical parameter of the image is performed.
Optionally, the optical parameter is luminance or chrominance.
A system for identifying a target object from a background, the system being applied to an electronic device having an image capturing unit, the system comprising:
an image information acquisition unit, which is used for acquiring the image of the target object in the background through the image acquisition unit and acquiring image information;
an optical parameter adjusting unit for adjusting an optical parameter;
the second image information acquisition unit is used for acquiring second image information of the target object in the background through the image acquisition unit;
and the target object identification unit is used for identifying the target object from the background according to the th image information and the second image information.
Optionally, the optical parameter adjusting unit includes:
optical parameter adjusting subunit for adjusting the optical parameter of the background.
Optionally, the target object uses a display unit as the background, and the optical parameter adjusting unit includes:
and the second optical parameter adjusting subunit is used for adjusting the optical parameters of the display unit.
Optionally, the target object identification unit includes:
an optical parameter obtaining subunit for obtaining the th image information optical parameters and the second image information optical parameters;
an th area identification subunit, configured to identify a th area of the two image information where the optical parameter variation is smaller than a preset threshold;
target object identifying subunit for determining the region as the target object.
Optionally, the target object identification unit includes:
a second optical parameter acquiring subunit configured to acquire an optical parameter of the th image information and an optical parameter of the second image information;
the second area identification subunit is used for identifying a second area of the two image information, wherein the change of the optical parameter is greater than a preset threshold value;
a second object identifying subunit, configured to determine, as the object, a remaining area excluding the second area in the image information.
Optionally, the optical parameter adjusting unit includes:
an optical parameter increasing subunit for increasing an optical parameter of the image;
an optical parameter reduction subunit for reducing an optical parameter of the image.
Optionally, the optical parameter adjusting unit further includes:
an optical parameter range identifying subunit for identifying whether an optical parameter of the image is in an th optical parameter range or a second optical parameter range, an optical parameter value in the th optical parameter range being smaller than an optical parameter value in the second optical parameter range;
an th control subunit for controlling the optical parameter increasing subunit to perform the step of increasing the optical parameter of the image when the optical parameter of the image is in the th optical parameter range;
a second control subunit, configured to control the optical parameter reduction subunit to perform the step of reducing the optical parameter of the image when the optical parameter of the image is in the second optical parameter range.
Optionally, the optical parameter is luminance or chrominance.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the method and the system for identifying the target object from the background can eliminate the interference of the optical parameters of the display unit on the object position determining process by changing the optical parameters of the image displayed by the display unit, placing the object on the display unit, respectively obtaining the image information before and after the optical parameters are changed, and identifying the target object from the background according to the area where the optical parameters are not obviously changed, thereby accurately identifying the target object from the background.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a flow chart of an embodiment 1 of the method of identifying a target object from a background according to the present invention;
FIG. 2 is a flow chart of embodiment 2 of the method of identifying a target object from a background according to the present invention;
FIG. 3 is a flow chart of embodiment 3 of the method of identifying a target object from a background according to the present invention;
FIG. 4 is a block diagram of embodiment 1 of the system for identifying a target object from the background of the present invention;
FIG. 5 is a block diagram of embodiment 2 of the system for identifying a target object from the background of the present invention;
fig. 6 is a block diagram of embodiment 3 of the system for identifying a target object from background according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, a more detailed description is provided below in conjunction with the accompanying drawings and the detailed description.
The method for identifying the target object from the background is applied to electronic equipment with an image acquisition unit, wherein the object is positioned above a display unit, the image acquisition unit can be a camera and the like, the display unit can be a display unit of the electronic equipment such as a tablet personal computer and the like, a certain background pattern such as a chessboard and the like can be displayed on the display unit, when the outline of the object is determined, the position of the object relative to the display unit can be determined, the object can be used as chess pieces to play chess games on the display unit, or when the object is the electronic equipment such as a mobile phone, after the target object is identified from the background, the information related to the mobile phone can be displayed on the display unit in an area adjacent to the mobile phone according to the position of the object relative to the display unit.
Fig. 1 is a flowchart of an embodiment 1 of the method for identifying a target object from the background according to the present invention. As shown in fig. 1, the method may include:
101, acquiring an image of the target object in the background through the image acquisition unit to acquire th image information
Because the object is located above the display unit, the image captured by the image capture unit will have two portions, part being the image displayed by the display unit itself and the second being the image formed by the object in the image capture unit.
In practical applications, the display unit may be controlled to display single uniform colors, such as white, in which case, the th part of the image captured by the image capturing unit is white, and the second part may be a shadow.
Step 102: adjusting an optical parameter of the image;
the optical parameters of the image displayed by the display unit are adjustable. Optical parameters in various embodiments of the present invention may include luminance and chrominance. The brightness change may mean that the brightness changes when the background color is not changed. The colorimetric change may mean that the color of the background, e.g., the RGB value, changes.
Assuming that the display unit displays a pure white background, the display unit displays a brighter image when the brightness value is higher than when the brightness is lower.
In order to make the change of the brightness of the image displayed by the display unit not be perceived by the user, the brightness change range may be controlled to be between 1-3 nits.
Step 103: acquiring second image information of the target object in the background through the image acquisition unit;
the second image information is obtained after adjusting the optical parameters of the image, and therefore, the second image information has different optical parameters from the th image information.
And 104, identifying the target object from the background according to the th image information and the second image information.
Since the second image information and the image information have different optical parameters, and the image information and the second portion of the second image information are blocked by the object, the optical parameters of the second portion are not changed substantially or slightly changed, and the degree of change of the optical parameters is different from that of the portion.
In summary, in the method for identifying a target object from a background according to this embodiment, by changing the optical parameters of the image displayed by the display unit, placing an object on the display unit, respectively obtaining the image information before and after the brightness change, and identifying the target object from the background according to the area where the optical parameters do not significantly change, it is possible to eliminate the interference of the optical parameters of the display unit on the object position determination process, thereby accurately identifying the target object from the background.
Fig. 2 is a flowchart of an embodiment 2 of the method for identifying a target object from the background according to the present invention. As shown in fig. 2, the method may include:
step 201, collecting the display image of the display unit through the image collection unit to obtain th image information;
step 202: adjusting the brightness of the image;
step 203: acquiring second image information of the display unit through the image acquisition unit;
step 204, acquiring the brightness information of the th image information and the brightness information of the second image information;
step 205, identifying th areas with brightness variation smaller than a preset threshold value in the two image information;
at step 206, the th area is determined as the position of the object.
Since the image capturing unit is located above the display unit, the captured image of the display unit may be blocked by the object, the blocked area may not have a significant change in brightness, and the change in brightness may be smaller than a preset threshold, so that the th area may be determined as the location of the object.
The above embodiment has been described with respect to luminance as an example, and may be replaced with chrominance.
Fig. 3 is a flowchart of embodiment 3 of the method for identifying a target object from the background according to the present invention. As shown in fig. 3, the method may include:
step 302: adjusting the chrominance of the image;
step 303: acquiring second image information of the display unit through the image acquisition unit;
acquiring the chrominance information of the th image information and the chrominance information of the second image information at step 304;
step 305: identifying a second area with the chrominance variation larger than a preset threshold value in the two image information;
step 306: and determining the remaining area excluding the second area in the image information as the position of the object.
The above embodiments have exemplified chromaticity, but may be replaced with luminance.
It should be noted that, in various embodiments of the present invention, the step of adjusting the optical parameter of the image may include:
increasing an optical parameter of the image;
the absolute value of the difference between the optical parameter of the image before adjustment and the optical parameter of the image after adjustment is greater than .
In addition, in order to protect the service life of the display unit and avoid the damage of the display unit caused by adjusting the display unit to a higher optical parameter, the embodiment of the invention may further include the steps of:
identifying whether an optical parameter of the image is in an th optical parameter range or a second optical parameter range, an optical parameter value in the th optical parameter range being less than an optical parameter value in the second optical parameter range;
performing the step of increasing the optical parameter of the image when the optical parameter of the image is in the th optical parameter range;
when the optical parameter of the image is in the second optical parameter range, the step of reducing the optical parameter of the image is performed.
The display unit in this state may not adjust the optical parameters of the image to be lower, so when the optical parameters of the image are in the optical parameter range, the step of increasing the optical parameters of the image is performed, the second optical parameter range is the optical parameter range, the display unit in this state may not adjust the optical parameters of the image to be higher, or, when the optical parameters of the image are in the second optical parameter range, damage to the display unit may be caused, so when the optical parameters of the image are in the second optical parameter range, the step of decreasing the optical parameters of the image is performed.
The invention also discloses systems for identifying a target object from the background, wherein the system is applied to an electronic device with an image acquisition unit, and the object is positioned above the display unit.
Fig. 4 is a block diagram of embodiment 1 of the system for identifying a target object from background according to the present invention. As shown in fig. 4, the system may include:
an image information acquiring unit 401 for acquiring image information by acquiring the image of the target object in the background through the image acquisition unit;
a second image information obtaining unit 403, configured to obtain, by the image acquisition unit, second image information of the target object in the background;
and object recognition 404, configured to recognize the object from the background according to the th image information and the second image information.
In the system for identifying the target object from the background according to the embodiment, by changing the brightness of the image displayed by the display unit, placing the object on the display unit, respectively acquiring the image information before and after the brightness change, and determining the position of the object relative to the display unit according to the area where the brightness does not significantly change, the interference of the brightness of the display unit on the object position determination process can be eliminated, so that the position of the object above the display unit can be accurately determined.
Fig. 5 is a block diagram of embodiment 2 of the system for identifying a target object from background according to the present invention. As shown in fig. 5, the system may include:
an th image information acquiring unit 401 for acquiring th image information by acquiring the display image of the display unit through the image acquisition unit;
a luminance adjusting unit 4021 for adjusting the luminance of the image;
a second image information obtaining unit 403, configured to obtain, by the image acquisition unit, second image information of the display unit;
an th luminance information acquiring sub-unit 4041 for acquiring luminance information of the th image information and luminance information of the second image information;
an th region identification subunit 4042, configured to identify a th region of the two image information whose luminance change is smaller than a preset threshold;
, a target object identifying subunit 4043, configured to determine the area as the target object.
The above embodiment has been described with respect to luminance as an example, and may be replaced with chrominance.
Fig. 6 is a block diagram of embodiment 3 of the system for identifying a target object from background according to the present invention. As shown in fig. 6, the system may include:
an th image information acquiring unit 401 for acquiring th image information by acquiring the display image of the display unit through the image acquisition unit;
a chromaticity adjusting unit 4022 for adjusting chromaticity of the image;
a second image information obtaining unit 403, configured to obtain, by the image acquisition unit, second image information of the display unit;
a second chrominance information acquiring subunit 4044, configured to acquire chrominance information of the th image information and chrominance information of the second image information;
a second region identification subunit 4045, configured to identify a second region of the two pieces of image information where the chromaticity variation is greater than a preset threshold;
a second target object identifying subunit 4046, configured to determine, as the target object, a remaining area of the image information excluding the second area.
The above embodiments have exemplified chromaticity, but may be replaced with luminance.
In the system for recognizing a target object from the background of the present invention, the optical parameter adjusting unit 402 may include:
an optical parameter increasing subunit for increasing an optical parameter of the image;
an optical parameter reduction subunit for reducing an optical parameter of the image.
The optical parameter adjusting unit 402 may further include:
an optical parameter range identifying subunit for identifying whether an optical parameter of the image is in an th optical parameter range or a second optical parameter range, an optical parameter value in the th optical parameter range being smaller than an optical parameter value in the second optical parameter range;
an th control subunit for controlling the optical parameter increasing subunit to perform the step of increasing the optical parameter of the image when the optical parameter of the image is in the th optical parameter range;
th control subunit, for controlling the optical parameter reduction subunit to perform the step of reducing the optical parameter of the image when the optical parameter of the image is in the second optical parameter range.
Finally, it should also be noted that, in this document, relational terms such as , second, and the like are only used to distinguish entities or operations from another entities or operations, without necessarily requiring or implying any actual relationship or order between such entities or operations, furthermore, the terms "comprise", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises the series of elements does not include only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus.
Based on the understanding that all or part of the technical solution of the present invention contributing to the background can be embodied in the form of a software product, which can be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing computer devices (which may be personal computers, servers, or network devices, etc.) to execute the method described in each embodiment or some parts of the embodiments of the present invention.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core idea of the present invention, and to those skilled in the art with variations in the specific embodiments and applications of the invention.
Claims (10)
- A method for recognizing a target object from a background, the method being applied to an electronic device having an image pickup unit, the method comprising:acquiring an image of the target object in the background through the image acquisition unit to acquire th image information;adjusting the optical parameter without being perceived by a user; the optical parameters include: brightness;acquiring second image information of the target object in the background through the image acquisition unit;identifying the target object from the background according to the th image information and the second image information;wherein the identifying the target object from the background comprises at least of the following:acquiring optical parameters of the th image information and optical parameters of the second image information;identifying th areas of the two image information, wherein the optical parameter change is smaller than a preset threshold value;determining the th area as the target object;alternatively, the first and second electrodes may be,acquiring optical parameters of the th image information and optical parameters of the second image information;identifying a second area of the two image information, wherein the change of the optical parameter is greater than a preset threshold value;and determining the residual area excluding the second area in the image information as the target object.
- 2. The method of claim 1, wherein the adjusting an optical parameter is adjusting an optical parameter of the background.
- 3. The method according to claim 1, wherein the target object has a display unit as the background;the adjusting the optical parameter includes: adjusting an optical parameter of the display unit.
- 4. The method of claim 1, wherein said adjusting optical parameters imperceptibly to a user comprises:increasing an optical parameter of the image;alternatively, the optical parameters of the image are reduced.
- 5. The method of claim 1, further comprising:identifying whether an optical parameter of the image is in an th optical parameter range or a second optical parameter range, an optical parameter value in the th optical parameter range being less than an optical parameter value in the second optical parameter range;performing the step of increasing the optical parameter of the image when the brightness of the image is in the th optical parameter range;when the brightness of the image is in the second optical parameter range, the step of reducing the optical parameter of the image is performed.
- A system for recognizing an object from a background, the system being applied to an electronic device having an image pickup unit, the system comprising:an image information acquisition unit, which is used for acquiring the image of the target object in the background through the image acquisition unit and acquiring image information;an optical parameter adjusting unit for adjusting the optical parameter without being perceived by a user; the optical parameters include: brightness;the second image information acquisition unit is used for acquiring second image information of the target object in the background through the image acquisition unit;a target object recognition unit for recognizing the target object from a background based on the th image information and the second image information;wherein the target object identification unit comprises at least of the following:an optical parameter obtaining subunit for obtaining the th image information optical parameters and the second image information optical parameters;an th area identification subunit, configured to identify a th area of the two image information where the optical parameter variation is smaller than a preset threshold;target object identifying subunit for determining the region as the target object;alternatively, the first and second electrodes may be,a second optical parameter acquiring subunit configured to acquire an optical parameter of the th image information and an optical parameter of the second image information;the second area identification subunit is used for identifying a second area of the two image information, wherein the change of the optical parameter is greater than a preset threshold value;a second object identifying subunit, configured to determine, as the object, a remaining area excluding the second area in the image information.
- 7. The system of claim 6, wherein the optical parameter adjustment unit comprises:optical parameter adjusting subunit for adjusting the optical parameter of the background.
- 8. The system of claim 6, wherein the target object has a display unit as the background, and the optical parameter adjustment unit comprises:and the second optical parameter adjusting subunit is used for adjusting the optical parameters of the display unit.
- 9. The system of claim 6, wherein the optical parameter adjustment unit comprises:an optical parameter increasing subunit for increasing an optical parameter of the image;an optical parameter reduction subunit for reducing an optical parameter of the image.
- 10. The system of claim 6, wherein the optical parameter adjustment unit further comprises:an optical parameter range identifying subunit for identifying whether an optical parameter of the image is in an th optical parameter range or a second optical parameter range, an optical parameter value in the th optical parameter range being smaller than an optical parameter value in the second optical parameter range;an th control subunit for controlling the optical parameter increasing subunit to perform the step of increasing the optical parameter of the image when the optical parameter of the image is in the th optical parameter range;a second control subunit, configured to control the optical parameter reduction subunit to perform the step of reducing the optical parameter of the image when the optical parameter of the image is in the second optical parameter range.
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| CN102236475A (en) * | 2010-04-29 | 2011-11-09 | 北京汇冠新技术股份有限公司 | Touch positioning method and device, touch screen and display |
| CN102804204A (en) * | 2009-06-25 | 2012-11-28 | 皇家飞利浦电子股份有限公司 | Geture recognition using chroma- keying |
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| CN102804204A (en) * | 2009-06-25 | 2012-11-28 | 皇家飞利浦电子股份有限公司 | Geture recognition using chroma- keying |
| CN102236475A (en) * | 2010-04-29 | 2011-11-09 | 北京汇冠新技术股份有限公司 | Touch positioning method and device, touch screen and display |
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