CN103051841B - The control method of time of exposure and device - Google Patents
The control method of time of exposure and device Download PDFInfo
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- CN103051841B CN103051841B CN201310002371.9A CN201310002371A CN103051841B CN 103051841 B CN103051841 B CN 103051841B CN 201310002371 A CN201310002371 A CN 201310002371A CN 103051841 B CN103051841 B CN 103051841B
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Abstract
The invention discloses the control method of time of exposure and device, by detecting the jitter level of terminal, and the corresponding relation in conjunction with jitter level Yu time of exposure determines time of exposure, when jitter level is more low, corresponding time of exposure is more long, and this is equivalent to when terminal jitter level is relatively low, automatically into the pattern that image quality is preferential, light sensitivitys (ISO) is reduced, thus improving the image quality of photo by elongating time of exposure.
Description
Technical Field
The present invention relates to the field of camera control, and in particular, to a method and an apparatus for controlling exposure time.
Background
Some scene mode settings exist in the camera, such as a night scene mode, a seaside mode, a snow scene mode, and the like, and when a user selects different scenes, the camera shutters have different exposure times, so that pictures with better image quality can be obtained in different scenes.
However, no matter the camera is a separate terminal or is integrated in the smart mobile terminal, the selection of the scene mode requires manual operation of the user, and particularly when the camera is integrated in the smart mobile terminal, the user often needs to click the touch screen several times to call up a menu for selecting the scene mode, which is very cumbersome to operate.
Disclosure of Invention
The embodiment of the invention provides a method and a device for controlling exposure time, which can automatically control the exposure time on the premise of simplifying user operation.
The invention provides a method for controlling exposure time, which comprises the following steps:
detecting a photographing trigger event;
if a photographing triggering event is detected, detecting the jitter level of the terminal;
determining exposure time corresponding to the jitter level according to the corresponding relation between the jitter level and the exposure time;
wherein the lower the jitter level, the longer the corresponding exposure time.
According to the control method of the exposure time provided by the embodiment of the invention, the exposure time is determined by detecting the jitter level of the terminal and combining the corresponding relation between the jitter level and the exposure time, when the jitter level is lower, the corresponding exposure time is longer, which is equivalent to automatically entering a mode with priority on image quality when the jitter level of the terminal is lower, and the exposure time is prolonged to reduce the sensitivity (ISO), so that the image quality of a picture is improved.
The embodiment of the invention provides three modes for detecting the jitter level of a terminal.
In a first mode, the jitter level of the detection terminal is:
detecting the change of the linear acceleration of the terminal within a set time; and determining the shaking level according to the first corresponding relation between the variation range of the linear acceleration and the shaking level.
Further, the method also includes:
detecting the current external light intensity;
selecting a first corresponding relation corresponding to the current external light intensity;
in the first correspondence relationship corresponding to the lower external light intensity, the same range of variation of the linear acceleration corresponds to a higher jitter level. Therefore, different external light intensities correspond to different first corresponding relations, so that external light is taken into consideration, and the exposure time is controlled more reasonably.
In a second mode, the jitter level of the detection terminal is:
detecting the change of angular acceleration of the terminal in set time; and determining the jitter level according to the second corresponding relation between the change range of the angular acceleration and the jitter level.
Further, the method also includes:
detecting the current external light intensity;
selecting a second corresponding relation corresponding to the current external light intensity;
wherein, the same angular acceleration variation range, in the second corresponding relationship corresponding to the lower external light intensity, the higher the corresponding dithering level. Therefore, different external light intensities correspond to different second corresponding relations, so that external light is taken into consideration, and the exposure time is controlled more reasonably.
In a third mode, the jitter level of the detection terminal is:
respectively detecting the change of linear acceleration and the change of angular acceleration of the terminal within set time;
determining the jitter level according to the first corresponding relation between the variation range of the linear acceleration and the jitter level;
determining the shaking level according to the second corresponding relation between the change range of the angular acceleration and the shaking level;
if the jitter level determined according to the first corresponding relation is the same as the jitter level determined according to the second corresponding relation, taking any one of the jitter levels as the jitter level of the terminal; and if the jitter level determined according to the first corresponding relation is different from the jitter level determined according to the second corresponding relation, taking the higher jitter level as the jitter level of the terminal.
Further, the method also includes:
detecting the current external light intensity;
selecting a first corresponding relation and a second corresponding relation corresponding to the current external light intensity;
wherein, the same variation range of the linear acceleration is higher in the corresponding first corresponding relation of lower external light intensity; the same angular acceleration variation range corresponds to a higher jitter level in the second correspondence relationship corresponding to a lower external light intensity. Therefore, different external light intensities correspond to different first corresponding relations and different second corresponding relations, so that external light is taken into consideration, and exposure time is controlled more reasonably.
In the first and third aspects, the change of the linear acceleration of the detection terminal within the set time is:
respectively detecting linear acceleration components of the terminal in each set direction at each moment in set time, respectively calculating absolute values of differences between the linear acceleration components of the moment in each set direction and the linear acceleration components of the previous moment, and adding the absolute values of the set directions to obtain a motion vector sum of the terminal at the moment;
and obtaining a change curve of the motion vector sum of the terminal in the set time.
Further, as an optional implementation manner, determining the jitter level according to the first corresponding relationship is:
calculating the area value enclosed by the change curve;
and determining the jitter grade corresponding to the area value according to the corresponding relation between the area value range and the jitter grade.
Further, as an optional implementation manner, determining the jitter level according to the first corresponding relationship is:
calculating the difference value of each wave peak value of the change curve and two adjacent wave valley values;
calculating the average value of all the difference values;
and determining the jitter level corresponding to the average value according to the corresponding relation between the average value range and the jitter level.
In the second and third modes, the change of the angular acceleration of the detection terminal within the set time is:
respectively detecting the angular acceleration component of the terminal in each set direction at each moment in set time, respectively calculating the absolute value of the difference between the angular acceleration component of the moment in each set direction and the angular acceleration component of the previous moment, and adding the absolute values of the set directions to obtain the motion vector sum of the terminal at the moment;
and obtaining a change curve of the motion vector sum of the terminal in the set time.
Further, as an optional implementation manner, determining, according to the second correspondence, the jitter level as:
calculating the area value enclosed by the change curve;
and determining the jitter grade corresponding to the area value according to the corresponding relation between the area value range and the jitter grade.
Further, as an optional implementation manner, determining, according to the second correspondence, the jitter level as:
calculating the difference value of each wave peak value of the change curve and two adjacent wave valley values;
calculating the average value of all the difference values;
and determining the jitter level corresponding to the average value according to the corresponding relation between the average value range and the jitter level.
The embodiment of the invention provides a control device of exposure time, which comprises:
the first detection unit is used for detecting a photographing trigger event;
the second detection unit is used for detecting the jitter level of the terminal after the first detection unit detects the photographing trigger event;
a control unit configured to determine an exposure time corresponding to the shake level detected by the second detection unit, based on a correspondence between the shake level and the exposure time;
wherein the lower the jitter level, the longer the corresponding exposure time.
The internal structure of the second detection unit has three implementation modes.
In a first implementation, the second detection unit includes:
the first detection module is used for detecting the change of the linear acceleration of the terminal within the set time after the first detection unit detects the photographing trigger event;
the first determining module is used for determining the jitter level according to the first corresponding relation between the variation range of the linear acceleration and the jitter level.
Further, the second detection unit further includes:
the selection module is used for detecting the current external light intensity; selecting a first corresponding relation corresponding to the current external light intensity;
wherein, the same variation range of the linear acceleration is higher in the first corresponding relationship corresponding to lower external light intensity.
In a second implementation manner, the second detection unit includes:
the second detection module is used for detecting the change of angular acceleration of the terminal in set time after the first detection unit detects the photographing trigger event;
and the second determining module is used for determining the jitter level according to the second corresponding relation between the change range of the angular acceleration and the jitter level.
Further, the second detection unit further includes:
the selection module is used for detecting the current external light intensity; selecting a second corresponding relation corresponding to the current external light intensity;
wherein, the same angular acceleration variation range, in the second corresponding relationship corresponding to the lower external light intensity, the higher the corresponding dithering level.
In a third implementation, the second detection unit includes:
the first detection module is used for detecting the change of the linear acceleration of the terminal within the set time after the first detection unit detects the photographing trigger event;
the second detection module is used for detecting the change of angular acceleration of the terminal in set time after the first detection unit detects the photographing trigger event;
the first determining module is used for determining the jitter level according to the first corresponding relation between the variation range of the linear acceleration and the jitter level;
the second determining module is used for determining the jitter level according to the second corresponding relation between the change range of the angular acceleration and the jitter level;
and a third determining module, configured to use any one of the jitter levels as a jitter level of the terminal when the jitter level determined according to the first corresponding relationship is the same as the jitter level determined according to the second corresponding relationship, and use a higher jitter level as a jitter level of the terminal when the jitter level determined according to the first corresponding relationship is different from the jitter level determined according to the second corresponding relationship.
Further, the second detection unit further includes:
the selection module is used for detecting the current external light intensity; selecting a first corresponding relation and a second corresponding relation corresponding to the current external light intensity;
wherein, the variation range of the same linear acceleration is higher in the first corresponding relation corresponding to the lower external light intensity; the same angular acceleration variation range corresponds to a higher jitter level in the second correspondence relationship corresponding to a lower external light intensity.
In the first and third implementations, the first detection module includes:
the detection submodule is used for respectively detecting the linear acceleration component of the terminal in each set direction at each moment in set time, respectively calculating the absolute value of the difference between the linear acceleration component of the moment in each set direction and the linear acceleration component of the previous moment, and adding the absolute values of the set directions to obtain the motion vector sum of the terminal at the moment;
and the generation submodule is used for obtaining a change curve of the motion vector sum of the terminal within the set time according to the detection result of the detection submodule.
Further, as an optional implementation manner, the first determining module includes:
the first calculation submodule is used for calculating an area value enclosed by the change curve obtained by the generation submodule;
and the first determining submodule is used for determining the jitter level corresponding to the area value calculated by the first calculating submodule according to the corresponding relation between the area value range and the jitter level.
Further, as an optional implementation manner, the first determining module includes:
the first calculation submodule is used for calculating the difference value between each peak value of the change curve obtained by the generation submodule and two adjacent wave valley values of the change curve; calculating the average value of all the difference values;
and the first determining submodule is used for determining the jitter level corresponding to the average value according to the corresponding relation between the average value range and the jitter level.
In a second and third embodiment, the second detection module comprises:
the detection submodule is used for respectively detecting the angular acceleration component of the terminal in each set direction at each moment in set time, respectively calculating the absolute value of the difference between the angular acceleration component of the moment in each set direction and the angular acceleration component of the previous moment, and adding the absolute values of the set directions to obtain the motion vector sum of the terminal at the moment;
and the generation submodule is used for obtaining a change curve of the motion vector sum of the terminal within the set time according to the detection result of the detection submodule.
Further, as an optional implementation manner, the second determining module includes:
the second calculation submodule is used for calculating an area value enclosed by the change curve obtained by the generation submodule;
and the second determining submodule is used for determining the jitter level corresponding to the area value calculated by the first calculating submodule according to the corresponding relation between the area value range and the jitter level.
Further, as an optional implementation manner, the second determining module includes:
the second calculation submodule is used for calculating the difference value between each peak value of the change curve obtained by the generation submodule and two adjacent wave valley values of the change curve; calculating the average value of all the difference values;
and the second determining submodule is used for determining the jitter level corresponding to the average value according to the corresponding relation between the average value range and the jitter level.
Additional features and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solutions of the embodiments of the present invention are further described in detail with reference to the accompanying drawings and embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention, and are incorporated in and constitute a part of this specification, and do not constitute a limitation on embodiments of the invention. In the drawings:
FIG. 1 is a flowchart of a method for controlling exposure time according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for controlling exposure time according to a second embodiment of the present invention;
FIG. 3 is a schematic view of setting directions in the second embodiment of the present invention;
fig. 4 is a variation curve of the motion vector sum of the terminal in the second embodiment of the present invention;
FIG. 5 is a flowchart of a method for controlling exposure time according to a third embodiment of the present invention;
FIG. 6 is a flowchart of a method for controlling exposure time according to a fourth embodiment of the present invention;
fig. 7 is a schematic structural diagram of an exposure time control apparatus according to a fifth embodiment of the present invention;
fig. 8 is a schematic structural diagram of an exposure time control apparatus according to a sixth embodiment of the present invention;
fig. 9 is a schematic structural diagram of an exposure time control apparatus according to a seventh embodiment of the present invention;
fig. 10 is a schematic structural diagram of an exposure time control apparatus according to an eighth embodiment of the present invention.
Detailed Description
The preferred embodiments are described below in conjunction with the appended drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustrating and explaining embodiments of the present invention, and are not intended to limit the embodiments of the present invention.
Example one
Fig. 1 is a flowchart of a method for controlling an exposure time according to an embodiment of the present invention, where the flowchart includes:
step 11: a photo trigger event is detected.
In this step, the photographing triggering event may be triggering a physical key with a shutter function, or clicking a soft key with a shutter function on the touch display screen.
Step 12: and if the photographing triggering event is detected, detecting the jitter level of the terminal.
Step 13: determining exposure time corresponding to the jitter level according to the corresponding relation between the jitter level and the exposure time; wherein the lower the jitter level, the longer the corresponding exposure time.
In this step, the jitter level reflects the jitter degree of the user, and the higher the jitter level is, the higher the jitter degree is.
The corresponding relation between the jitter level and the exposure time is preset, different jitter levels correspond to different exposure times, and the specific values of the jitter level and the exposure time can be determined according to experience values on the premise of ensuring the picture quality of the photos.
In the method for controlling exposure time provided in this embodiment, the exposure time is determined by detecting the shake level of the terminal and combining the corresponding relationship between the shake level and the exposure time, and when the shake level is lower, the corresponding exposure time is longer, which is equivalent to automatically entering a mode with priority to image quality when the shake level of the terminal is lower, and the exposure time is lengthened to reduce the sensitivity (ISO), thereby improving the image quality of the picture.
Example two
Fig. 2 is a flowchart of a method for controlling exposure time according to a second embodiment of the present invention, where the flowchart includes:
step 21: a photo trigger event is detected.
In this step, the photographing triggering event may be triggering a physical key with a shutter function, or clicking a soft key with a shutter function on the touch display screen.
Step 22: the change of the linear acceleration of the detection terminal within the set time is detected.
Optionally, the detecting of the change of the linear acceleration of the terminal within the set time in this step may be implemented as follows: and respectively detecting the linear acceleration component of the terminal in each set direction at each moment in set time, respectively calculating the absolute value of the difference between the linear acceleration component of the moment in each set direction and the linear acceleration component of the last moment, adding the absolute values of the set directions to obtain the motion vector sum of the terminal at the moment, and obtaining the motion vector sum change curve of the terminal in the set time.
As an example, the above-mentioned set directions are X, Y and Z directions as shown in fig. 3, and it is assumed that linear acceleration components detected in these three directions are X ', Y ', and Z ', respectively.
The motion vector sum of the terminal at a certain time is: s = | x | + | y | + | z |.
Wherein X = X '(current) -X' (previous); y = Y '(current) -Y' (previous); z = Z '(current) -Z' (previous). Current in the above formula represents the current time and previous represents the last time.
Fig. 4 is a generated motion vector and variation curve, in which the vertical axis represents the motion vector and S, and the horizontal axis represents time.
Step 23: determining the jitter level according to the first corresponding relation between the variation range of the linear acceleration and the jitter level; wherein the lower the jitter level, the longer the corresponding exposure time.
In this step, the first corresponding relationship between the variation range of the linear acceleration and the jitter level is preset, and the specific value can be determined according to an empirical value.
Two examples of applications are as follows.
In the first application example, the first corresponding relationship is specifically a corresponding relationship between an area value range and a jitter level, an area value surrounded by the motion vector and the change curve generated in step 22 may be calculated, then the jitter level corresponding to the area value is determined according to the corresponding relationship between the area value range and the jitter level, and when the obtained area value is larger, it is proved that the higher the jitter degree of the user is, the higher the corresponding jitter level is. The area value can be determined in a number of ways, for example by integrating the curve.
As shown in fig. 4, the left half of the variation curve reflects the user jitter to a higher degree and the corresponding jitter level is also higher, and the right half reflects the user jitter to a lower degree and the corresponding jitter level is also lower.
In the second application example, the first corresponding relationship is specifically a corresponding relationship between an average value range and a jitter level, at this time, a difference between each peak value and two adjacent valley values in the motion vector and the variation curve generated in step 22 may be calculated, then an average value of all the difference values is calculated, and finally, a jitter level corresponding to the calculated average value is determined according to the corresponding relationship between the average value range and the jitter level, and when the obtained average value is larger, it is proved that the higher the jitter degree of the user is, the higher the corresponding jitter level is.
As shown in fig. 4, the left half of the variation curve reflects the user jitter to a higher degree and the corresponding jitter level is also higher, and the right half reflects the user jitter to a lower degree and the corresponding jitter level is also lower.
In this step, as an optional implementation manner, there may be a plurality of preset first corresponding relationships, and different external light intensities correspond to different first corresponding relationships. In the first correspondence relationship corresponding to the lower external light intensity, the same range of variation of the linear acceleration corresponds to a higher jitter level. In this case, a step of detecting the intensity of the external light is further included before step 23. Therefore, external light can be taken into consideration, and the exposure time can be controlled more reasonably.
EXAMPLE III
Fig. 5 is a flowchart of a method for controlling exposure time according to a third embodiment of the present invention, where the flowchart includes:
step 51: a photo trigger event is detected.
In this step, the photographing triggering event may be triggering a physical key with a shutter function, or clicking a soft key with a shutter function on the touch display screen.
Step 52: and detecting the change of angular acceleration of the terminal in a set time.
Optionally, the detecting of the change of the angular acceleration of the terminal within the set time in this step may be implemented as follows: and at each moment in the set time, detecting the angular acceleration component of the terminal in each set direction, calculating the absolute value of the difference between the angular acceleration component of the moment in each set direction and the angular acceleration component of the previous moment, adding the absolute values of the set directions to obtain the motion vector sum of the terminal at the moment, and obtaining the motion vector sum of the terminal in the set time.
The specific application example is the same as that in the second embodiment, and the setting direction and the change curve are similar to those shown in fig. 3 and 4, respectively.
Step 53: determining the shaking level according to the second corresponding relation between the change range of the angular acceleration and the shaking level; wherein the lower the jitter level, the longer the corresponding exposure time.
In this step, the second correspondence between the variation range of the angular acceleration and the jitter level is preset, and the specific value thereof may be determined according to an empirical value.
Two examples of applications are as follows.
In the first application example, the second corresponding relationship is specifically a corresponding relationship between an area value range and a jitter level, an area value surrounded by the motion vector and the change curve generated in step 52 may be calculated, then the jitter level corresponding to the area value is determined according to the corresponding relationship between the area value range and the jitter level, and when the obtained area value is larger, it is proved that the higher the jitter degree of the user is, the higher the corresponding jitter level is. The area value can be determined in a number of ways, for example by integrating the curve.
In the second application example, the second corresponding relationship is specifically a corresponding relationship between an average value range and a jitter level, at this time, a difference between each peak value and two adjacent valley values in the motion vector and the variation curve generated in step 52 may be calculated, then an average value of all the difference values is calculated, and finally, a jitter level corresponding to the calculated average value is determined according to the corresponding relationship between the average value range and the jitter level, and when the obtained average value is larger, it is proved that the higher the jitter degree of the user is, the higher the corresponding jitter level is.
In this step, as an optional implementation manner, there may be a plurality of preset second corresponding relationships, where different external light intensities correspond to different second corresponding relationships, and the variation range of the same angular acceleration is higher in the second corresponding relationship corresponding to the lower external light intensity, and the corresponding jitter level is higher. In this case, a step of detecting the intensity of the external light is further included before step 53. Therefore, external light can be taken into consideration, and the exposure time can be controlled more reasonably.
Example four
Fig. 6 is a flowchart of a method for controlling exposure time according to a fourth embodiment of the present invention, where the flowchart includes:
step 61: a photo trigger event is detected.
In this step, the photographing triggering event may be triggering a physical key with a shutter function, or clicking a soft key with a shutter function on the touch display screen.
Step 62: and if the photographing triggering event is detected, respectively detecting the change of the linear acceleration and the change of the angular acceleration of the terminal within the set time.
In this step, the change in the detected linear acceleration can be realized as described in the second embodiment, and the change in the detected angular acceleration can be realized as described in the third embodiment.
And step 63: and determining the shaking level according to the first corresponding relation between the variation range of the linear acceleration and the shaking level.
In this step, determining the jitter level according to the first corresponding relationship may be implemented in the manner of the second embodiment.
Step 64: and determining the jitter level according to the second corresponding relation between the change range of the angular acceleration and the jitter level.
In this step, determining the jitter level according to the second corresponding relationship may be implemented in the manner described in the third embodiment.
Step 65: if the jitter level determined according to the first corresponding relation is the same as the jitter level determined according to the second corresponding relation, taking any one of the jitter levels as the jitter level of the terminal; and if the jitter level determined according to the first corresponding relation is different from the jitter level determined according to the second corresponding relation, taking the higher jitter level as the jitter level of the terminal.
In the fourth embodiment, as an optional implementation manner, there may be a plurality of preset first corresponding relations, which are the same as those in the second embodiment, and a plurality of preset second corresponding relations, which are the same as those in the third embodiment.
EXAMPLE five
Fig. 7 is a schematic structural diagram of an exposure time control apparatus according to a fifth embodiment of the present invention, where the apparatus includes: a first detection unit 71, a second detection unit 72, and a control unit 73.
A first detection unit 71, configured to detect a photographing trigger event.
A second detecting unit 72, configured to detect a shake level of the terminal after the first detecting unit 71 detects the photographing triggering event.
A control unit 73 for determining an exposure time corresponding to the shake level detected by the second detection unit, based on a correspondence between the shake level and the exposure time; wherein the lower the jitter level, the longer the corresponding exposure time. The jitter level here reflects the user's jitter level, and the higher the jitter level, the higher the jitter level reflects.
In the fifth embodiment, the correspondence between the jitter level and the exposure time is preset, different jitter levels correspond to different exposure times, and specific values of the jitter level and the exposure time can be determined according to empirical values on the premise of ensuring the picture quality of the photo.
The fifth embodiment provides an exposure time control apparatus, which determines an exposure time by detecting a shake level of a terminal and combining a correspondence relationship between the shake level and the exposure time, wherein the lower the shake level, the longer the corresponding exposure time is, which is equivalent to automatically entering a mode of giving priority to image quality when the shake level of the terminal is lower, and the exposure time is lengthened to reduce sensitivity (ISO), thereby improving image quality of a photograph.
EXAMPLE six
Fig. 8 is a schematic structural diagram of an exposure time control apparatus according to a sixth embodiment of the present invention, including: a first detection unit 81, a second detection unit 82, and a control unit 83.
The first detecting unit 81 is configured to detect a photographing trigger event.
The second detection unit 82 includes: a first detection module 821 and a first determination module 822.
The first detecting module 821 is configured to detect a change of a linear acceleration of the terminal within a set time after the first detecting unit 81 detects the photo triggering event.
The first determining module 822 is configured to determine the jitter level according to a first corresponding relationship between the variation range of the linear acceleration and the jitter level.
As an alternative embodiment, the first detection module 821 includes: a detection submodule and a generation submodule.
The detection submodule is configured to detect linear acceleration components of the terminal in each set direction at each time within a set time, calculate absolute values of differences between the linear acceleration components of the terminal in the set direction at the time and the linear acceleration components of the terminal at the previous time, and add the absolute values of the set directions to obtain a motion vector sum of the terminal at the time.
And the generation submodule is used for obtaining a change curve of the motion vector sum of the terminal within the set time according to the detection result of the detection submodule.
Based on the optional internal structure of the first detection module 821, as a first optional implementation, the first determination module 822 includes: a first calculation submodule and a first determination submodule.
The first calculating submodule is used for calculating an area value enclosed by the change curve obtained by the generating submodule.
The first determining submodule is configured to determine, according to a correspondence between the area value range and the jitter level, the jitter level corresponding to the area value calculated by the first calculating submodule.
In the present embodiment, it is verified that the higher the obtained area value is, the higher the user's jitter level is, and the higher the corresponding jitter level is.
Based on the optional internal structure of the first detection module 821, as a second optional implementation, the first determination module 822 includes: a first calculation submodule and a first determination submodule.
The first calculating submodule is configured to calculate a difference between each peak of the variation curve obtained by the generating submodule and two adjacent wave troughs of the variation curve; the average of all differences is calculated.
The first determining submodule is configured to determine, according to a correspondence between an average value range and a jitter level, a jitter level corresponding to the average value.
In the present embodiment, it is verified that the higher the average value obtained, the higher the jitter level of the user, and the higher the corresponding jitter level.
As an optional implementation manner, the second detection unit 82 may further include: a selection module 823 for detecting the current external light intensity; selecting a first corresponding relation corresponding to the current external light intensity; wherein, the same variation range of the linear acceleration is higher in the first corresponding relationship corresponding to lower external light intensity.
A control unit 83 for determining the exposure time corresponding to the shake level detected by the second detecting unit 82, based on the correspondence between the shake level and the exposure time; wherein the lower the jitter level, the longer the corresponding exposure time.
EXAMPLE seven
Fig. 9 is a schematic structural diagram of an exposure time control apparatus according to a seventh embodiment of the present invention, where the apparatus includes: a first detection unit 91, a second detection unit 92 and a control unit 93.
The first detecting unit 91 is configured to detect a photographing trigger event.
The second detection unit 92 includes: a second detection module 921 and a second determination module 922.
And the second detection module 921, configured to detect a change of angular acceleration of the terminal within a set time after the first detection unit 91 detects the photographing trigger event.
And a second determining module 922, configured to determine the shake level according to a second corresponding relationship between the variation range of the angular acceleration and the shake level.
As an alternative implementation, the second detection module 921 includes: a detection submodule and a generation submodule.
The detection submodule is configured to detect angular acceleration components of the terminal in each set direction at each time within a set time, calculate absolute values of differences between the angular acceleration components of the terminal in the set direction at the time and the angular acceleration components of the terminal in the previous time, and add the absolute values of the terminal in the set directions to obtain a motion vector sum of the terminal at the time.
And the generation submodule is used for obtaining a change curve of the motion vector sum of the terminal within the set time according to the detection result of the detection submodule.
Based on the optional internal structure of the second detection module 921, as an optional implementation, the second determination module 922 includes: a second calculation submodule and a second determination submodule.
And the second calculating submodule is used for calculating an area value enclosed by the change curve obtained by the generating submodule.
The second determining submodule is configured to determine, according to a correspondence between the area value range and the jitter level, the jitter level corresponding to the area value calculated by the first calculating submodule.
In the present embodiment, it is verified that the higher the obtained area value is, the higher the user's jitter level is, and the higher the corresponding jitter level is.
Based on the optional internal structure of the second detection module 921, as another optional implementation, the second determination module 922 includes: a second calculation submodule and a second determination submodule.
The second calculating submodule is used for calculating the difference value between each peak value of the change curve obtained by the generating submodule and two adjacent wave valley values of the change curve; the average of all differences is calculated.
The second determining submodule is configured to determine, according to a correspondence between the average value range and the jitter level, the jitter level corresponding to the average value.
In the present embodiment, it is verified that the higher the average value obtained, the higher the jitter level of the user, and the higher the corresponding jitter level.
As an optional implementation manner, the second detection unit 92 may further include: a selection module 923 for detecting the current external light intensity; selecting a second corresponding relation corresponding to the current external light intensity; the same angular acceleration variation range corresponds to a higher jitter level in the second correspondence relationship corresponding to a lower external light intensity.
A control unit 93 for determining the exposure time corresponding to the shake level detected by the second detecting unit 92, based on the correspondence between the shake level and the exposure time; wherein the lower the jitter level, the longer the corresponding exposure time.
Example eight
Fig. 10 is a schematic structural diagram of an exposure time control apparatus according to an eighth embodiment of the present invention, where the apparatus includes: a first detection unit 1001, a second detection unit 1002, and a control unit 1003.
The first detecting unit 1001 is configured to detect a photographing trigger event.
The second detection unit 1002 includes: a first detection module 111, a second detection module 112, a first determination module 113, a second determination module 114, and a third determination module 115.
The first detecting module 111 is configured to detect a change of a linear acceleration of the terminal within a set time after the first detecting unit 1001 detects the photo trigger event.
The second detecting module 112 is configured to detect a change of angular acceleration of the terminal within a set time after the first detecting unit 1001 detects the photo trigger event.
The first determining module 113 is configured to determine the jitter level according to a first corresponding relationship between the variation range of the linear acceleration and the jitter level.
And a second determining module 114, configured to determine the jitter level according to a second corresponding relationship between the variation range of the angular acceleration and the jitter level.
A third determining module 115, configured to use any one of the jitter levels as a jitter level of the terminal when the jitter level determined according to the first corresponding relationship is the same as the jitter level determined according to the second corresponding relationship, and use a higher jitter level as a jitter level of the terminal when the jitter level determined according to the first corresponding relationship is different from the jitter level determined according to the second corresponding relationship.
As an alternative implementation, the internal structure of the first detection module 111 may be the same as that of the first detection module 821 in the sixth embodiment, and further, the internal structure of the first determination module 113 may be the same as that of the first determination module 822 in the sixth embodiment.
As an alternative implementation, the internal structure of the second detection module 112 may be the same as the second detection module 921 in example seven, and further, the internal structure of the second determination module 114 may be the same as the second determination module 922 in example seven.
As an optional implementation manner, the second detection unit 1002 further includes: a selection module 116 for detecting the current external light intensity; selecting a first corresponding relation and a second corresponding relation corresponding to the current external light intensity; wherein, the same variation range of the linear acceleration is higher in the corresponding dithering level in the first corresponding relation corresponding to the lower external light intensity; in the second correspondence relationship corresponding to the lower external light intensity, the same angular acceleration variation range corresponds to the higher jitter level.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, provided that such modifications and variations of the embodiments of the present invention fall within the scope of the claims and their equivalents, the embodiments of the present invention are intended to include such modifications and variations as well.
Claims (14)
1. A method for controlling exposure time, the method comprising:
detecting a photographing trigger event;
if a photographing triggering event is detected, detecting the jitter level of the terminal;
determining exposure time corresponding to the jitter level according to the corresponding relation between the jitter level and the exposure time; wherein, the lower the jitter level, the longer the corresponding exposure time;
the jitter level of the detection terminal is as follows:
detecting the change of the linear acceleration of the terminal within a set time; detecting the current external light intensity; selecting a first corresponding relation corresponding to the current external light intensity; determining the jitter level according to the first corresponding relation between the variation range of the linear acceleration and the jitter level; wherein, the same variation range of the linear acceleration is higher in the corresponding dithering level in the first corresponding relation corresponding to the lower external light intensity; or,
detecting the change of angular acceleration of the terminal in set time; detecting the current external light intensity; selecting a second corresponding relation corresponding to the current external light intensity; determining the shaking level according to the second corresponding relation between the change range of the angular acceleration and the shaking level; wherein, the variation range of the same angular acceleration is higher in the corresponding dithering level in the second corresponding relation corresponding to the lower external light intensity; or,
respectively detecting the change of linear acceleration and the change of angular acceleration of the terminal within set time; detecting the current external light intensity; selecting a first corresponding relation and a second corresponding relation corresponding to the current external light intensity; determining the jitter level according to the first corresponding relation between the variation range of the linear acceleration and the jitter level; determining the shaking level according to the second corresponding relation between the change range of the angular acceleration and the shaking level; if the jitter level determined according to the first corresponding relation is the same as the jitter level determined according to the second corresponding relation, taking any one of the jitter levels as the jitter level of the terminal; if the jitter level determined according to the first corresponding relation is different from the jitter level determined according to the second corresponding relation, taking the higher jitter level as the jitter level of the terminal; wherein, the same variation range of the linear acceleration is higher in the corresponding first corresponding relation of lower external light intensity; the same angular acceleration variation range corresponds to a higher jitter level in the second correspondence relationship corresponding to a lower external light intensity.
2. The method of claim 1, wherein the change of the linear acceleration of the detection terminal in the set time is:
respectively detecting linear acceleration components of the terminal in each set direction at each moment in set time, respectively calculating absolute values of differences between the linear acceleration components of the moment in each set direction and the linear acceleration components of the previous moment, and adding the absolute values of the set directions to obtain a motion vector sum of the terminal at the moment;
and obtaining a change curve of the motion vector sum of the terminal in the set time.
3. The method of claim 2, wherein determining a jitter level based on the first correspondence is:
calculating the area value enclosed by the change curve;
and determining the jitter grade corresponding to the area value according to the corresponding relation between the area value range and the jitter grade.
4. The method of claim 2, wherein determining a jitter level based on the first correspondence is:
calculating the difference value of each wave peak value of the change curve and two adjacent wave valley values;
calculating the average value of all the difference values;
and determining the jitter level corresponding to the average value according to the corresponding relation between the average value range and the jitter level.
5. The method of claim 1, wherein the change of the angular acceleration of the detection terminal in the set time is:
respectively detecting the angular acceleration component of the terminal in each set direction at each moment in set time, respectively calculating the absolute value of the difference between the angular acceleration component of the moment in each set direction and the angular acceleration component of the previous moment, and adding the absolute values of the set directions to obtain the motion vector sum of the terminal at the moment;
and obtaining a change curve of the motion vector sum of the terminal in the set time.
6. The method of claim 5, wherein determining the jitter level from the second correspondence is:
calculating the area value enclosed by the change curve;
and determining the jitter grade corresponding to the area value according to the corresponding relation between the area value range and the jitter grade.
7. The method of claim 5, wherein determining the jitter level from the second correspondence is:
calculating the difference value of each wave peak value of the change curve and two adjacent wave valley values;
calculating the average value of all the difference values;
and determining the jitter level corresponding to the average value according to the corresponding relation between the average value range and the jitter level.
8. An exposure time control apparatus, comprising:
the first detection unit is used for detecting a photographing trigger event;
the second detection unit is used for detecting the jitter level of the terminal after the first detection unit detects the photographing trigger event;
a control unit configured to determine an exposure time corresponding to the shake level detected by the second detection unit, based on a correspondence between the shake level and the exposure time; wherein, the lower the jitter level, the longer the corresponding exposure time;
the second detection unit includes: the first detection module is used for detecting the change of the linear acceleration of the terminal within the set time after the first detection unit detects the photographing trigger event; the selection module is used for detecting the current external light intensity; selecting a first corresponding relation corresponding to the current external light intensity; the first determining module is used for determining the jitter level according to the first corresponding relation between the variation range of the linear acceleration and the jitter level; wherein, the variation range of the same linear acceleration is higher in the first corresponding relation corresponding to the lower external light intensity; or,
the second detection unit includes: the second detection module is used for detecting the change of angular acceleration of the terminal in set time after the first detection unit detects the photographing trigger event; the selection module is used for detecting the current external light intensity; selecting a second corresponding relation corresponding to the current external light intensity; the second determining module is used for determining the jitter level according to the second corresponding relation between the change range of the angular acceleration and the jitter level; wherein, the variation range of the same angular acceleration is higher in the corresponding dithering level in the second corresponding relation corresponding to the lower external light intensity; or,
the second detection unit includes: the first detection module is used for detecting the change of the linear acceleration of the terminal within the set time after the first detection unit detects the photographing trigger event; the second detection module is used for detecting the change of angular acceleration of the terminal in set time after the first detection unit detects the photographing trigger event; the selection module is used for detecting the current external light intensity; selecting a first corresponding relation and a second corresponding relation corresponding to the current external light intensity; the first determining module is used for determining the jitter level according to the first corresponding relation between the variation range of the linear acceleration and the jitter level; the second determining module is used for determining the jitter level according to the second corresponding relation between the change range of the angular acceleration and the jitter level; a third determining module, configured to use any one of the jitter levels as a jitter level of the terminal when the jitter level determined according to the first corresponding relationship is the same as the jitter level determined according to the second corresponding relationship, and use a higher jitter level as a jitter level of the terminal when the jitter level determined according to the first corresponding relationship is different from the jitter level determined according to the second corresponding relationship; wherein, the variation range of the same linear acceleration is higher in the first corresponding relation corresponding to the lower external light intensity; the same angular acceleration variation range corresponds to a higher jitter level in the second correspondence relationship corresponding to a lower external light intensity.
9. The apparatus of claim 8, wherein the first detection module comprises:
the detection submodule is used for respectively detecting the linear acceleration component of the terminal in each set direction at each moment in set time, respectively calculating the absolute value of the difference between the linear acceleration component of the moment in each set direction and the linear acceleration component of the previous moment, and adding the absolute values of the set directions to obtain the motion vector sum of the terminal at the moment;
and the generation submodule is used for obtaining a change curve of the motion vector sum of the terminal within the set time according to the detection result of the detection submodule.
10. The apparatus of claim 9, wherein the first determining module comprises:
the first calculation submodule is used for calculating an area value enclosed by the change curve obtained by the generation submodule;
and the first determining submodule is used for determining the jitter level corresponding to the area value calculated by the first calculating submodule according to the corresponding relation between the area value range and the jitter level.
11. The apparatus of claim 9, wherein the first determining module comprises:
the first calculation submodule is used for calculating the difference value between each peak value of the change curve obtained by the generation submodule and two adjacent wave valley values of the change curve; calculating the average value of all the difference values;
and the first determining submodule is used for determining the jitter level corresponding to the average value according to the corresponding relation between the average value range and the jitter level.
12. The apparatus of claim 8, wherein the second detection module comprises:
the detection submodule is used for respectively detecting the angular acceleration component of the terminal in each set direction at each moment in set time, respectively calculating the absolute value of the difference between the angular acceleration component of the moment in each set direction and the angular acceleration component of the previous moment, and adding the absolute values of the set directions to obtain the motion vector sum of the terminal at the moment;
and the generation submodule is used for obtaining a change curve of the motion vector sum of the terminal within the set time according to the detection result of the detection submodule.
13. The apparatus of claim 12, wherein the second determining module comprises:
the second calculation submodule is used for calculating an area value enclosed by the change curve obtained by the generation submodule;
and the second determining submodule is used for determining the jitter level corresponding to the area value calculated by the first calculating submodule according to the corresponding relation between the area value range and the jitter level.
14. The apparatus of claim 12, wherein the second determining module comprises:
the second calculation submodule is used for calculating the difference value between each peak value of the change curve obtained by the generation submodule and two adjacent wave valley values of the change curve; calculating the average value of all the difference values;
and the second determining submodule is used for determining the jitter level corresponding to the average value according to the corresponding relation between the average value range and the jitter level.
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