CN103945119B - The method and its mobile terminal of raising camera focusing speed based on mobile terminal - Google Patents
The method and its mobile terminal of raising camera focusing speed based on mobile terminal Download PDFInfo
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Abstract
The invention discloses a kind of method of the raising camera focusing speed based on mobile terminal, including：Receive focusing order；Detect and judge whether the current frame rate of camera is less than setting frame per second；When judged result for when being, acquisition is more than the focusing frame per second of current frame rate；Focusing is completed according to focusing frame per second.Compared with prior art, mobile terminal of the present invention is after focusing order is received, detect first and judge whether the current frame rate of camera is less than setting frame per second, then in judged result for when being, obtain the focusing frame per second more than current frame rate, focusing is finally completed according to focusing frame per second, it is achieved thereby that in focus process, when ambient brightness is relatively low（I.e. current frame rate is less than setting frame per second）When, it is not to be focused with relatively low current frame rate, but focusing is completed with a larger focusing frame per second, focusing speed is fast, better user experience.The present invention discloses a kind of mobile terminal for improving camera focusing speed.
Description
Technical Field
The invention relates to the field of camera shooting, in particular to a method for improving focusing speed of a camera based on a mobile terminal and the mobile terminal.
Background
At present, except that a camera has a shooting function, cameras are installed on most mobile terminals, and the shooting function is achieved. A camera or a camera unit on a mobile terminal generally has an auto-focus function so that a photographed scene can be focused at the time of image preview. However, in a dark environment, in order to ensure the quality of a picture, a camera generally takes a picture at a lower frame rate, and focusing is performed at the lower frame rate during auto-focusing, which results in a very slow focusing speed.
Disclosure of Invention
The invention aims to provide a method for improving the focusing speed of a camera based on a mobile terminal, so as to realize quick focusing in a dark environment and improve user experience.
Another object of the present invention is to provide a mobile terminal for increasing the focusing speed of a camera, so as to achieve fast focusing in a dark environment and improve user experience.
In order to achieve the above object, the present invention provides a method for improving focusing speed of a camera based on a mobile terminal, comprising the following steps:
receiving a focusing command;
detecting and judging whether the current frame rate of the camera is less than a set frame rate;
when the judgment result is yes, acquiring a focusing frame rate which is not less than the current frame rate;
completing focusing according to the focusing frame rate,
wherein,
the step of acquiring the focusing frame rate not less than the set frame rate specifically includes:
and adjusting an exposure table stored in the mobile terminal to enable the frame rate corresponding to any exposure parameter in the exposure table not to be less than the set frame rate.
Compared with the prior art, the method for improving the focusing speed of the camera based on the mobile terminal comprises the steps that after the mobile terminal receives a focusing command, whether the current frame rate of the camera is smaller than the set frame rate is detected and judged, then the focusing frame rate larger than the current frame rate is obtained when the judgment result is yes, and finally focusing is finished according to the focusing frame rate, so that in the focusing process, when the environment brightness is low (namely the current frame rate is smaller than the set frame rate), focusing is finished not at the lower current frame rate, but at the focusing frame rate larger than the current frame rate, the focusing speed is high, and the user experience is better.
Preferably, the acquiring the focusing frame rate not less than the set frame rate specifically further includes:
and searching the adjusted exposure table according to the current environment brightness to obtain a corresponding frame rate as the focusing frame rate.
Preferably, the step of completing focusing according to the focusing frame rate further comprises:
judging whether the exposure table is changed;
and restoring the exposure table to a state before focusing according to the judgment result.
Preferably, after the detecting and determining whether the current frame rate of the camera is less than the set frame rate, the method further includes:
and when the judgment result is negative, finishing focusing according to the current frame rate.
Preferably, the step of completing focusing according to the focusing frame rate further comprises:
and adjusting the frame rate of the camera to the current frame rate from the focusing frame rate.
Correspondingly, the invention also provides a mobile terminal for improving the focusing speed of the camera, which comprises:
the receiving module is used for receiving a focusing command;
the detection and judgment module is used for detecting and judging whether the current frame rate of the camera is less than the set frame rate;
the acquisition module is used for acquiring a focusing frame rate which is not less than the current frame rate when the judgment result of the detection judgment module is yes; and
a first focusing module for completing focusing according to the focusing frame rate,
wherein,
the acquisition module specifically includes:
and the adjusting unit is used for adjusting the exposure table stored in the mobile terminal so that the frame rate corresponding to any exposure parameter in the exposure table is not less than the set frame rate.
Preferably, the acquiring module further includes:
and the acquisition unit is used for searching the adjusted exposure table according to the current environment brightness so as to acquire the corresponding frame rate as the focusing frame rate.
Preferably, the mobile terminal for increasing the focusing speed of the camera further includes:
the second focusing module is used for focusing according to the current frame rate when the judgment result of the detection judgment module is negative;
the judging module is used for judging whether the exposure table is changed or not after focusing is finished;
the restoration module is used for restoring the exposure table to a state before focusing according to the judgment result of the judgment module; and
and the frame rate adjusting module is used for adjusting the frame rate of the camera from the focusing frame rate to the current frame rate after the focusing is finished.
The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.
Drawings
Fig. 1 is a flowchart of an embodiment of a method for increasing a focusing speed of a camera based on a mobile terminal according to the present invention.
Fig. 2 is a block diagram of a mobile terminal according to an embodiment of the present invention for increasing a focusing speed of a camera.
Detailed Description
Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements. According to the method for improving the focusing speed of the camera based on the mobile terminal, when the ambient brightness is low, the frame rate of the camera can be quickly improved after the focusing command is received, the camera is focused at a larger focusing frame rate, and after the focusing is finished, the frame rate before the focusing is recovered, so that the quick focusing is realized, and the user experience is better.
Referring to fig. 1, the method for improving focusing speed of a camera based on a mobile terminal of the present invention includes the following steps:
step S101, receiving a focusing command issued by an upper layer;
step S102, detecting the frame rate of the camera under the current environment brightness, and recording the frame rate as the current frame rate, if the current frame rate is 15 frames/second; wherein, the environmental brightness and the frame rate of the camera are in one-to-one correspondence;
specifically, an exposure table is stored in the mobile terminal, the exposure table includes a plurality of exposure parameters, the exposure parameters include an ambient brightness X, an exposure time Y, and a signal gain value Z (that is, an amplification gain of the acquired analog image data before analog-to-digital conversion is performed, and since the signal gain amplifies a noise signal at the same time, the signal gain value is not the larger, the better), a one-to-one correspondence relationship exists between the exposure parameters, and in addition, the exposure time and the frame rate of the camera are also one-to-one correspondence, so that the ambient brightness, the exposure time, the signal gain value, and the frame rate are one-to-one correspondence, and the exposure table is shown in table 1 below:
| ambient brightness X | Exposure time Y | Signal gain value Z |
| X0 | Y0 | Z0 |
| X1 | Y1 | Z1 |
| …… | ……. | ……. |
| Xn | Yn | Zn |
TABLE 1
As can be seen from table 1, the ambient brightness X0 corresponds to the exposure time Y0 and the signal gain value Z0, the ambient brightness X1 corresponds to the exposure time Y1 and the signal gain value Z1 … … corresponds to the exposure time Yn and the signal gain value Zn, that is, when the current ambient brightness is X0, the exposure time Y of the camera is set to Y0, and the signal gain value Z of the Image Signal Processor (ISP) is set to Z0, and so on. In order to ensure the quality of the photo, the exposure time Y is generally shorter and the signal gain value Z is larger as the ambient brightness X is larger, and similarly, the exposure time Y is longer and the signal gain value Z is smaller as the ambient brightness X is smaller (i.e. the light is darker), so that when X0 to Xn in table 1 is decreased from large (i.e. the ambient brightness is changed from bright to dark), the exposure time Y0 to Yn is increased from small to large, and the signal gain value Z0 to Zn is decreased from large; the frame rate and the exposure time Y are in an inverse relation, and the longer the exposure time Y is, the lower the frame rate is, so that when the light is dark, the lower the frame rate is, and the focusing speed is very slow.
Step S103, judging whether the current frame rate is less than the set frame rate, if so, executing step S104, otherwise, executing step S106, wherein the set frame rate is a preset reference value, if the set frame rate is 20 frames/second, executing step S104 when the current frame rate is less than 20 frames/second, otherwise, executing step S106;
step S104, acquiring a focusing frame rate greater than the current frame rate, more specifically, acquiring a focusing frame rate not less than the set frame rate (i.e., a frame rate of the camera during the focusing process) in this embodiment, and then adjusting the frame rate of the camera from the current frame rate to the focusing frame rate;
the method for obtaining the focusing frame rate includes multiple methods, a larger frame rate (the frame rate is not less than the set frame rate) can be simply and directly set, and after the camera receives the focusing command, the frame rate is directly set as the focusing frame rate.
Of course, other ways may also be adopted to implement the method, such as adjusting an exposure table in the mobile terminal, and then the mobile terminal obtains the focusing frame rate according to the current ambient brightness and the adjusted exposure table. In this embodiment, the focusing frame rate is obtained in this manner. Specifically, in order to avoid that the frame rate of the camera is too low due to the dark ambient brightness during focusing, the exposure table may be adjusted according to a preset rule, so that when the ambient brightness is dark, the frame rate of the camera still can be not less than the set frame rate, if the ambient brightness corresponding to the set frame rate is Xa (a < n), and the exposure time is Za, the exposure table may be adjusted, the exposure time corresponding to the ambient brightness X having the ambient brightness less than Xa in the exposure table is all adjusted to Za, and the corresponding signal gain values are all set to the maximum value Y0, so that the maximum exposure time in the exposure table can be guaranteed to be Za, and thus the minimum frame rate of the camera is the set frame rate, and then the mobile terminal obtains the frame rate of the camera according to the current ambient brightness and the adjusted exposure table, where the frame rate is the focusing frame rate, so that the obtained focusing frame rate is not less.
Step S105, the voice coil motor starts to move, and the position with the clearest focusing is searched for according to the obtained focusing frame rate to finish focusing;
step S106, the voice coil motor starts to move, and the position with the clearest focusing is searched for at the current frame rate to finish focusing;
as can be seen from the above steps S105 and S106: when the current frame rate is higher than the set frame rate, the camera focuses at the current frame rate, when the current frame rate is lower than the set frame rate (namely, the ambient brightness is lower), the focusing frame rate which is not higher than the current frame rate is obtained, and then the focusing is carried out at the focusing frame rate, so that the focusing at the higher frame rate is adopted in the focusing process, and the problems of too low frame rate and low focusing speed caused by too low ambient brightness are solved.
Step S107, after focusing is finished, judging whether an exposure table is changed in the focusing process, if so, executing step S108, otherwise, executing step S109;
step S108, adjusting the exposure table again, and restoring the exposure table to the exposure table before focusing;
step S109, restoring the frame rate of the camera from the focusing frame rate to the current frame rate (i.e. the frame rate before focusing); after focusing is finished, the frame rate of the camera is adjusted to be the frame rate before focusing, the problem that when a user previews, due to the fact that the frame rate is improved in the focusing process, the signal gain value is too large, and then noise is too large is solved, and user experience is good.
Referring to fig. 2, the mobile terminal 100 for increasing the focusing speed of the camera according to the present invention includes:
a receiving module 10, configured to receive a focusing command;
the detection and judgment module 11 is used for detecting and judging whether the current frame rate of the camera is less than the set frame rate;
an obtaining module 12, configured to obtain a focusing frame rate greater than the current frame rate when the determination result of the detecting and determining module 11 is yes; more specifically, the obtaining module 12 is configured to obtain a focusing frame rate not less than a set frame rate when the determination result of the detecting and determining module 11 is yes, where the obtaining module 12 includes an adjusting unit 121 and an obtaining unit 122, the adjusting unit 121 is configured to adjust an exposure table stored in the mobile terminal so that a frame rate corresponding to any one exposure parameter in the exposure table is not less than the set frame rate, where the exposure parameter includes an ambient brightness, an exposure time and a signal gain value, and the obtaining unit 122 is configured to obtain focusing according to the current ambient brightness and the adjusted exposure table;
the first focusing module 13 is configured to complete focusing according to the focusing frame rate obtained by the obtaining module 12;
the second focusing module 14 is configured to complete focusing according to the current frame rate when the determination result of the detection determining module 11 is negative;
the judging module 15 is used for judging whether the exposure table is changed after the focusing is finished;
a restoring module 16, configured to restore the exposure table to a state before focusing according to the determination result of the determining module 15; and
and the frame rate adjusting module 17 is configured to adjust the frame rate of the camera from the focusing frame rate to the current frame rate after the focusing is completed.
As can be seen from the above description, when the mobile terminal 100 of the present invention for increasing the focusing speed of a camera operates, after receiving a focusing command, first, the detection and determination module 11 detects and determines whether the current frame rate of the camera is less than the set frame rate, if the determination result is yes, the acquisition module 12 acquires the focusing frame rate not less than the set frame rate, then the first focusing module 13 completes focusing according to the focusing frame rate acquired by the acquisition module 12, and if the determination result is no, the second focusing module 14 focuses according to the current frame rate, and after focusing is finished, the frame rate adjustment module 17 adjusts the frame rate of the camera from the focusing frame rate to the current frame rate, so that in the focusing process, when the ambient brightness is low (i.e. the current frame rate is less than the set frame rate), focusing is not completed at the lower current frame rate, but at a higher focusing frame rate, and the focusing speed is high, the user experience is better.
The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and is intended to cover various modifications, equivalent combinations, which are made in accordance with the spirit of the present invention.
Claims (6)
1. A method for improving focusing speed of a camera based on a mobile terminal is characterized by comprising the following steps:
receiving a focusing command;
detecting and judging whether the current frame rate of the camera is less than a set frame rate;
when the judgment result is yes, adjusting an exposure table stored in the mobile terminal to enable the frame rate corresponding to any exposure parameter in the exposure table to be not less than the set frame rate, wherein the exposure parameters in the exposure table comprise environment brightness, exposure time, signal gain values and frame rates which are in one-to-one correspondence;
acquiring the frame rate of a camera according to the current environment brightness and the adjusted exposure table, and taking the frame rate as a focusing frame rate; and finishing focusing according to the focusing frame rate.
2. The method for improving the focusing speed of the camera based on the mobile terminal of claim 1, wherein the step of completing focusing according to the focusing frame rate further comprises:
judging whether the exposure table is changed;
and restoring the exposure table to a state before focusing according to the judgment result.
3. The method for increasing the focusing speed of the camera based on the mobile terminal according to claim 1, wherein the step of detecting and determining whether the current frame rate of the camera is less than the set frame rate further comprises:
and when the judgment result is negative, finishing focusing according to the current frame rate.
4. The method for improving the focusing speed of the camera based on the mobile terminal of claim 1, wherein the step of completing focusing according to the focusing frame rate further comprises:
and adjusting the frame rate of the camera to the current frame rate from the focusing frame rate.
5. The utility model provides an improve mobile terminal of camera speed of focusing which characterized in that includes:
the receiving module is used for receiving a focusing command;
the detection and judgment module is used for detecting and judging whether the current frame rate of the camera is less than the set frame rate;
the acquisition module is used for acquiring a focusing frame rate which is not less than the current frame rate when the judgment result of the detection judgment module is yes; and a first focusing module, configured to complete focusing according to the focusing frame rate, wherein the obtaining module specifically includes: the adjusting unit is used for adjusting an exposure table stored in the mobile terminal so that the frame rate corresponding to any exposure parameter in the exposure table is not less than the set frame rate, and the exposure parameters in the exposure table comprise one-to-one corresponding ambient brightness, exposure time, signal gain values and frame rate;
and the acquisition unit is used for searching the adjusted exposure table according to the current environment brightness so as to acquire the corresponding frame rate as the focusing frame rate.
6. The mobile terminal for increasing the focusing speed of a camera according to claim 5, further comprising:
the second focusing module is used for focusing according to the current frame rate when the judgment result of the detection judgment module is negative;
the judging module is used for judging whether the exposure table is changed or not after focusing is finished;
the restoration module is used for restoring the exposure table to a state before focusing according to the judgment result of the judgment module; and
and the frame rate adjusting module is used for adjusting the frame rate of the camera from the focusing frame rate to the current frame rate after the focusing is finished.
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| CN104954680A (en) * | 2015-06-16 | 2015-09-30 | 深圳市金立通信设备有限公司 | Camera focusing method and terminal |
| CN105611139B (en) * | 2015-07-15 | 2018-04-10 | 宇龙计算机通信科技(深圳)有限公司 | Image processing method, image processing apparatus and terminal |
| CN105227840B (en) * | 2015-10-08 | 2019-04-19 | Oppo广东移动通信有限公司 | Focusing method and device |
| CN106454127A (en) * | 2016-11-29 | 2017-02-22 | 惠州Tcl移动通信有限公司 | Method and system of improving the starting speed of camera of mobile terminal |
| CN108622100A (en) * | 2018-05-14 | 2018-10-09 | 常州星宇车灯股份有限公司 | A kind of road conditions automatic identification module |
| CN113709361B (en) * | 2021-07-27 | 2025-03-28 | 深圳市睿梁科技有限公司 | A method for dynamically adjusting frame rate to optimize autofocus |
| CN116074634B (en) * | 2022-05-27 | 2023-11-14 | 荣耀终端有限公司 | Exposure parameter determination method and device |
| CN115465225B (en) * | 2022-08-12 | 2024-05-10 | 重庆长安汽车股份有限公司 | Service life extension method and device of vehicle-mounted camera, vehicle and storage medium |
| CN118075617B (en) * | 2024-04-22 | 2024-07-23 | 杭州涂鸦信息技术有限公司 | Image exposure method, device, electronic equipment and storage medium |
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| CN102246504A (en) * | 2008-12-18 | 2011-11-16 | 高通股份有限公司 | System and method to autofocus assisted by autoexposure control |
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| US8154753B2 (en) * | 2008-10-29 | 2012-04-10 | Thx, Ltd. | Method and system for providing access to image system services |
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| CN102246504A (en) * | 2008-12-18 | 2011-11-16 | 高通股份有限公司 | System and method to autofocus assisted by autoexposure control |
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