CN103327244A - Shooting focusing method and device based on angular velocity detection - Google Patents
Shooting focusing method and device based on angular velocity detection Download PDFInfo
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- CN103327244A CN103327244A CN2013102224017A CN201310222401A CN103327244A CN 103327244 A CN103327244 A CN 103327244A CN 2013102224017 A CN2013102224017 A CN 2013102224017A CN 201310222401 A CN201310222401 A CN 201310222401A CN 103327244 A CN103327244 A CN 103327244A
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Abstract
The invention discloses a shooting focusing method and device based on angular velocity detection. The method includes receiving an image captured by camera equipment; detecting angular velocity data of the camera equipment at preset intervals, comparing the angular velocity data of a current frame and the angular velocity data of a previous frame, when the difference between the angular velocity data of the current frame and the angular velocity data of the previous frame is smaller than a preset threshold, starting automatic focusing, and when the difference is lager than or equal to the preset threshold, detecting the angular velocity data of the next frame. According to the shooting focusing method and device, by means of a gyroscope, whether focusing is to be carried out is judged. Data of the gyroscope can be directly obtained from a bottom drive, the operation state of the equipment can be obtained quickly and precisely, focusing is precisely and conveniently recognized, and the phenomenon that a focusing thread always occupies a CPU, and accordingly resources are wasted is avoided.
Description
Technical field
The present invention relates to the optical focus technology, particularly relate to a kind of shooting focusing method and device based on angular velocity detection.
Background technology
Focusing is also named light, focusing.By camera Focusing mechanism change object distance and position apart, the process of made thing imaging clearly is focused exactly.The general multi-band of present smart mobile phone has the function of touch screen focusing and continuous focusing.
The touch screen focusing refers to when detecting the action that a touch is arranged on the picture, is focused in the zone that the picture multiple spot touches, and this is according to user's oneself wish focusing process to be carried out in the place of wanting to focus.
Continuous focusing is the scenery picture that detects in a period of time, if do not change, focuses with regard to the automatic centring zone.This focusing mode is that the actual imaging according to camera lens judges whether correct coking, and the foundation of judgement generally is that contrast detects formula, concrete principle very complex.Continuous focusing need to carry out to two field picture that analyzing and processing obtains, thereby can take more cpu resource, if simultaneously also in mobile process, only mobile range is little, so just be not easy to detect, and be easy to occur the situation that mobile phone is also then focused in mobile process, waste cpu resource, poor user experience.
Summary of the invention
Based on this, be necessary for the problems referred to above, a kind of shooting focusing method and device based on angular velocity detection is provided, can identify intelligently the focusing operation, save cpu resource.
A kind of shooting focusing method based on angular velocity detection comprises:
Receive the picture image that picture pick-up device captures;
The Preset Time of being separated by detects the angular velocity data of described picture pick-up device, the gap of the angular velocity data of present frame and the angular velocity data of previous frame relatively, and when described gap during less than predetermined threshold value, starting automatically, focusing operates; When described gap during more than or equal to described predetermined threshold value, detect the angular velocity data of next frame.
Correspondingly, a kind of shooting focusing mechanism based on angular velocity detection comprises:
Take start unit, be used for receiving the picture image that picture pick-up device captures;
Data-reading unit, the Preset Time that is used for being separated by detects the angular velocity data of described picture pick-up device;
The data comparing unit is used for the gap of the angular velocity data of the angular velocity data of present frame relatively and previous frame;
Data determining unit is used for judging the size between described gap and the predetermined threshold value, when described gap during less than predetermined threshold value, starts automatically focusing operation; When described gap during more than or equal to described predetermined threshold value, detect the angular velocity data of next frame.
The present invention uses angular velocity data to judge whether current device remains static, because the focusing action need is in the situation that picture pick-up device is in relatively static carrying out, so, can be by the angular velocity data operation that judges whether to focus.Obtaining of angular velocity data can be by gyroscope, directly from bottom layer driving, obtain gyrostatic data, can get access to quickly and accurately the motion state of current device, accurately and easily identification focusing operation, avoid focusing operation thread to take CPU always, cause the wasting of resources.
Description of drawings
Fig. 1 is the flow chart of a kind of shooting focusing method based on angular velocity detection of the present invention;
Fig. 2 is the first embodiment flow chart of a kind of shooting focusing method based on angular velocity detection of the present invention;
Fig. 3 is the second embodiment flow chart of a kind of shooting focusing method based on angular velocity detection of the present invention;
Fig. 4 is the schematic diagram of a kind of shooting focusing mechanism based on angular velocity detection of the present invention;
Fig. 5 is the first embodiment schematic diagram of a kind of shooting focusing mechanism based on angular velocity detection of the present invention;
Fig. 6 is the second embodiment schematic diagram of a kind of shooting focusing mechanism based on angular velocity detection of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the flow chart of a kind of shooting focusing method based on angular velocity detection of the present invention, comprising:
S101: receive the picture image that picture pick-up device captures;
S102: the Preset Time of being separated by detects the angular velocity data of described picture pick-up device,
S103: the gap of the angular velocity data of comparison present frame and the angular velocity data of previous frame,
S104: when described gap during less than predetermined threshold value, start automatically focusing operation;
S105: when described gap during more than or equal to described predetermined threshold value, detect the angular velocity data of next frame.
The present invention is applicable to digital camera, slr camera, video camera, the mobile phone with camera function or panel computer or palmtop PC, or the equipment of other operations of need to focusing; The present invention can judge the motion state of machine or equipment, and then whether identification starts the focusing operation.The below is that technical scheme of the present invention describes in detail: at first, open camera, open the shooting process, catch the picture image that picture pick-up device photographs, the picture that can preview shoot with video-corder this moment; Meanwhile, or before the thread that starts automatically focusing operation, detect the angular velocity data of this picture pick-up device, preferably, can utilize gyroscope to detect, the Preset Time of being separated by receives the angular velocity data that gyroscope detects, relatively the gap of the angular velocity data of the angular velocity data of present frame and previous frame, when described gap during less than predetermined threshold value, restart automatic focusing operation thread; When described gap during more than or equal to described predetermined threshold value, detect the angular velocity data of next frame.Next frame as present frame, is proceeded comparison and judgement.
The focusing thread is a complexity and the operation that need take in a large number cpu resource.It possesses following 3 characteristics: 1, the captured main body of automatic decision photographer in some way; 2, measure in some way distance between shot subject and the camera photo-sensitive cell; 3, CD-ROM drive motor is shifted the focusing mechanism of camera lens onto correspondingly distance scale.Start the cooperation of hardware aspect except needs, also need to use the complex software algorithm, for example, range finding automatically focusing mainly contains infrared distance measuring algorithm and ultrasonic ranging algorithm, and focus detection methods mainly contains contrast algorithm and phase algorithm.Therefore, in the situation that the non-operation of focusing of user, start the focusing thread, can take a large amount of cpu resources undoubtedly, even driven some hardware and done unnecessary beamhouse operation, void has consumed hardware resource, has also wasted energy.
Gyroscope is mainly used in the anti-shake field of optics.For example, in the portable optics of eyeglass is anti-shake, survey the shake of camera by a pair of built-in gyro sensor, and with the direction adjustment of lens assembly to shake, to offset this shake, prevent fuzzy pictures.Gyroscope in the camera lens detects small movement, helps to calculate the displacement that needs compensation, and purpose is to overcome the image fog because of the generation of vibration of camera.And the present invention is applied to gyroscope to focus on the Intelligent Recognition that operates, and has obtained the saving cpu resource, opens quickly and accurately the excellent effects such as focusing.The present invention does not get rid of other instruments that can obtain the angular velocity data of the machine picture pick-up device.
Fig. 2 is the first embodiment flow chart of a kind of shooting focusing method based on angular velocity detection of the present invention.Compared to Figure 1, the embodiment of Fig. 2 is by the angular velocity data on the different directions of same frame relatively, as starting the automatically preposition Rule of judgment of focusing operation thread, in order to strengthen the recognition capability of focusing operation.
S201: receive the picture image that picture pick-up device captures;
S202: the Preset Time of being separated by detects the angular velocity data of described picture pick-up device;
S203: described angular velocity data comprises that described gyroscope detects the angular speed numerical value that obtains in the three-dimensional coordinate direction, calculate respectively the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame in the three-dimensional coordinate direction, ask for the absolute value of this difference as gap; Particularly,
Calculate the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame at the first coordinate direction, ask for the absolute value of this difference as gap;
Calculate the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame at the second coordinate direction, ask for the absolute value of this difference as gap;
Calculate the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame in the three-dimensional direction, ask for the absolute value of this difference as gap;
S204: when the above gap of all directions during all less than the predetermined threshold value on the direction separately, start automatically focusing operation;
S205: when described gap during more than or equal to described predetermined threshold value, detect the angular velocity data of next frame;
S206: when the gap of consecutive numbers frame all is not less than predetermined threshold value, maybe after the shooting of opening described picture pick-up device reaches Preset Time, close the detection of described angular velocity data, or withdraw from the shooting operation of described picture pick-up device, or enter standby, stop the reception of the picture image of described picture pick-up device.
By the angular velocity data on the different directions of same frame relatively, as starting the automatically preposition Rule of judgment of focusing thread.Described different directions comprises 1 direction at least, for example, equipment is placed on the fixing camera trivets, perhaps place on the plane, at this moment, only need to " about " angular speed on the direction judges.And need not the angular speed on " up and down " or " front and back " direction is judged.Preferably, the present embodiment is considered the angular speed on three-dimensional coordinate direction X-axis, Y-axis and Z axis.Calculate respectively the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame in the three-dimensional coordinate direction, ask for again the absolute value of this difference as gap; When the above gap of all directions during all less than the predetermined threshold value on the direction separately, start automatically focusing thread.
Fig. 3 is the second embodiment flow chart of a kind of shooting focusing method based on angular velocity detection of the present invention.Compare with Fig. 2, the embodiment of Fig. 3 adopts the angular velocity data of consecutive numbers frame to compare, as starting the automatically preposition Rule of judgment of focusing operation thread, in order to strengthen the recognition capability of focusing operation.
S301: receive the picture image that picture pick-up device captures;
S302: the Preset Time of being separated by detects the angular velocity data of described picture pick-up device;
S303: the statistics angular velocity difference apart from all less than the quantity of the frame of predetermined threshold value, wherein, will be on the time interval gap of the adjacent two frame angular velocity datas in front and back as the angular velocity difference distance of a rear frame;
S304: when the angular velocity difference of consecutive numbers frame apart from all less than predetermined threshold value the time, start automatically focusing operation;
S305: when described gap during more than or equal to described predetermined threshold value, detect the angular velocity data of next frame;
S306: when the gap of consecutive numbers frame all is not less than predetermined threshold value, maybe after the shooting of opening described picture pick-up device reaches Preset Time, close the detection of described angular velocity data, or withdraw from the shooting operation of described picture pick-up device, or enter standby, stop the reception of the picture image of described picture pick-up device.
Adopt the angular velocity data of consecutive numbers frame to compare, as starting the automatically preposition Rule of judgment of focusing thread.Described consecutive numbers frame comprises the angular velocity data of continuous at least 3 frames.Connect an embodiment described, constantly read gyro data, the current frame image gyro data is (x2, y2, z2), previous frame image gyro data is (x0, y0, z0), the gyro data of upper two field picture is (x3, y3, z3), the time interval of this three frame can arrange, and the gap of two adjacent frame angular velocity datas is as the angular velocity difference distance of a rear frame before and after will be on the time interval, and the statistics angular velocity difference is apart from all less than the quantity of the frame of predetermined threshold value; When consecutive numbers arrives 3 times, think that so then equipment remains static, then carry out focusing process, otherwise think that equipment is in mobile status, then do not carry out focusing process.The number of times of described consecutive numbers is by the actual demand setting.
When described gap during more than or equal to described predetermined threshold value, detect the angular velocity data of next frame.
When the gap of consecutive numbers frame all is not less than predetermined threshold value, close the detection of described angular velocity data.
When the gap of consecutive numbers frame all is not less than predetermined threshold value, withdraw from the shooting operation of described picture pick-up device.
When the gap of consecutive numbers frame all is not less than predetermined threshold value, or enter standby, stop the reception of the picture image of described picture pick-up device.
After the shooting of opening described picture pick-up device reaches Preset Time, close the detection of described angular velocity data.
After the shooting of opening described picture pick-up device reaches Preset Time, withdraw from the shooting operation of described picture pick-up device.
After the shooting of opening described picture pick-up device reaches Preset Time, enter standby, stop the reception of the picture image of described picture pick-up device.
The embodiment of Fig. 2, Fig. 3 has increased by two kinds of concrete manner of comparison, is respectively by the angular velocity data on the different directions of same frame relatively, as starting the automatically preposition Rule of judgment of focusing operation thread; And, adopt the angular velocity data of consecutive numbers frame to compare, as starting the automatically preposition Rule of judgment of focusing thread.Above-mentioned two preposition Rule of judgment can be selected one and use or be combined with simultaneously, to strengthen the recognition capability of focusing operation.
Fig. 4 is the schematic diagram of a kind of shooting focusing mechanism based on angular velocity detection of the present invention, comprising:
Take start unit, be used for receiving the picture image that picture pick-up device captures;
Data-reading unit, the Preset Time that is used for being separated by detects the angular velocity data of described picture pick-up device;
The data comparing unit is used for the gap of the angular velocity data of the angular velocity data of present frame relatively and previous frame;
Data determining unit is used for judging the size between described gap and the predetermined threshold value, when described gap during less than predetermined threshold value, starts automatically focusing operation; When described gap during more than or equal to described predetermined threshold value, detect the angular velocity data of next frame.
Fig. 4 is corresponding with Fig. 1, identical among the figure in the operational mode of unit and the method.
Fig. 5 is the first embodiment schematic diagram of a kind of shooting focusing mechanism based on angular velocity detection of the present invention.
As shown in Figure 5, therein in the middle of embodiment, described data comparing unit, comprise, the X coordinate difference is apart from computing unit, is used for calculating at the first coordinate direction the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame, asks for the absolute value of this difference as gap; The Y coordinate difference is apart from computing unit, is used for calculating at the second coordinate direction the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame, asks for the absolute value of this difference as gap; The Z coordinate difference is apart from computing unit, is used for calculating in the three-dimensional direction difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame, asks for the absolute value of this difference as gap;
Wherein, described data determining unit also links to each other apart from computing unit apart from computing unit, Z coordinate difference apart from computing unit, Y coordinate difference with the X coordinate difference respectively, when also be used for judging the above gap of all directions all less than the predetermined threshold value on the direction separately, start automatically focusing operation.
In the middle of embodiment, comprising therein:
Pattern withdraws from the unit, be used for when the gap of consecutive numbers frame all is not less than predetermined threshold value, or after the shooting of opening described picture pick-up device reaches Preset Time, close the detection of described angular velocity data, or withdraw from the shooting operation of described picture pick-up device, or enter standby, stop the reception of the picture image of described picture pick-up device.
Fig. 5 is corresponding with Fig. 2, identical among the figure in the operational mode of unit and the method.
Fig. 6 is the second embodiment schematic diagram of a kind of shooting focusing mechanism based on angular velocity detection of the present invention.
Different from Fig. 5 is, as shown in Figure 6, in the middle of embodiment, described data determining unit comprises therein:
The number of times statistic unit is used for the number of times statistic unit, is used for the statistics angular velocity difference apart from all less than the quantity of the frame of predetermined threshold value; Wherein, the gap of two adjacent frame angular velocity datas is as the angular velocity difference distance of a rear frame before and after will be on the time interval; When the angular velocity difference of consecutive numbers frame apart from all less than predetermined threshold value the time, start automatically focusing operation.
Fig. 6 is corresponding with Fig. 3, identical among the figure in the operational mode of unit and the method.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (8)
1. the shooting focusing method based on angular velocity detection is characterized in that, comprising:
Receive the picture image that picture pick-up device captures;
The Preset Time of being separated by detects the angular velocity data of described picture pick-up device, the gap of the angular velocity data of present frame and the angular velocity data of previous frame relatively, and when described gap during less than predetermined threshold value, starting automatically, focusing operates; When described gap during more than or equal to described predetermined threshold value, detect the angular velocity data of next frame.
2. the shooting focusing method based on angular velocity detection according to claim 1 is characterized in that, the gap of the angular velocity data of described relatively present frame and the angular velocity data of previous frame, when described gap during less than predetermined threshold value, start the automatically step of focusing operation, comprise
Calculate the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame at the first coordinate direction, ask for the absolute value of this difference as gap;
Calculate the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame at the second coordinate direction, ask for the absolute value of this difference as gap;
Calculate the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame in the three-dimensional direction, ask for the absolute value of this difference as gap;
When the above gap of all directions during all less than the predetermined threshold value on the direction separately, start automatically focusing operation.
3. the shooting focusing method based on angular velocity detection according to claim 1 and 2 is characterized in that, the gap of the angular velocity data of described relatively present frame and the angular velocity data of previous frame, when described gap during less than predetermined threshold value, start the automatically step of focusing operation, comprise
The statistics angular velocity difference is apart from all less than the quantity of the frame of predetermined threshold value; Wherein, the gap of two adjacent frame angular velocity datas is as the angular velocity difference distance of a rear frame before and after will be on the time interval;
When the angular velocity difference of consecutive numbers frame apart from all less than predetermined threshold value the time, start automatically focusing operation.
4. according to claim 1 to 3 each described shooting focusing methods based on angular velocity detection, it is characterized in that:
When the gap of consecutive numbers frame all is not less than predetermined threshold value, maybe after the shooting of opening described picture pick-up device reaches Preset Time, close the detection of described angular velocity data, or withdraw from the shooting operation of described picture pick-up device, or enter standby, stop the reception of the picture image of described picture pick-up device.
5. the shooting focusing mechanism based on angular velocity detection is characterized in that, comprising:
Take start unit, be used for receiving the picture image that picture pick-up device captures;
Data-reading unit, the Preset Time that is used for being separated by detects the angular velocity data of described picture pick-up device;
The data comparing unit is used for the gap of the angular velocity data of the angular velocity data of present frame relatively and previous frame;
Data determining unit is used for judging the size between described gap and the predetermined threshold value, when described gap during less than predetermined threshold value, starts automatically focusing operation; When described gap during more than or equal to described predetermined threshold value, detect the angular velocity data of next frame.
6. the shooting focusing mechanism based on angular velocity detection according to claim 5 is characterized in that, described data comparing unit comprises:
The X coordinate difference is apart from computing unit, is used for calculating at the first coordinate direction the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame, asks for the absolute value of this difference as gap;
The Y coordinate difference is apart from computing unit, is used for calculating at the second coordinate direction the difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame, asks for the absolute value of this difference as gap;
The Z coordinate difference is apart from computing unit, is used for calculating in the three-dimensional direction difference of the angular speed numerical value of the angular speed numerical value of present frame and previous frame, asks for the absolute value of this difference as gap;
Wherein, described data determining unit also links to each other apart from computing unit apart from computing unit, Z coordinate difference apart from computing unit, Y coordinate difference with the X coordinate difference respectively, when also be used for judging the above gap of all directions all less than the predetermined threshold value on the direction separately, start automatically focusing operation.
7. according to claim 5 or 6 described shooting focusing mechanisms based on angular velocity detection, it is characterized in that, described data determining unit comprises:
The number of times statistic unit is used for the statistics angular velocity difference apart from all less than the quantity of the frame of predetermined threshold value; Wherein, the gap of two adjacent frame angular velocity datas is as the angular velocity difference distance of a rear frame before and after will be on the time interval; When the angular velocity difference of consecutive numbers frame apart from all less than predetermined threshold value the time, start automatically focusing operation.
8. according to claim 5 to 7 each described shooting focusing mechanisms based on angular velocity detection, it is characterized in that, comprising:
Pattern withdraws from the unit, be used for when the gap of consecutive numbers frame all is not less than predetermined threshold value, or after the shooting of opening described picture pick-up device reaches Preset Time, close the detection of described angular velocity data, or withdraw from the shooting operation of described picture pick-up device, or enter standby, stop the reception of the picture image of described picture pick-up device.
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