CN114339062A - Method and device for improving image definition of specific area and electronic equipment - Google Patents
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Abstract
The invention discloses a method and a device for improving the image definition of a specific area and electronic equipment, wherein the method comprises the following steps: acquiring the illumination condition of the current ambient light; if the illumination condition of the current ambient light is detected to meet the preset condition, controlling to change the exposure parameter of the camera; carrying out video acquisition in a long exposure and short exposure alternating mode, and respectively generating a corresponding long exposure video and a corresponding short exposure video; processing an image in the short-exposure video, and extracting a region image corresponding to a specific region; and acquiring the position of a specific area in the long-exposure video, recording the position as a target position, and pasting the area image back to the target position to generate a target image. The invention can realize that after long exposure and short exposure are alternately shot under the condition of poor illumination condition, the specific area in the image shot by the short exposure is pasted back to the corresponding position of the long exposure image after the brightness of the specific area is improved, thereby improving the image definition of the automobile data recorder.
Description
Technical Field
The invention relates to the technical field of image recognition, in particular to a method and a device for improving image definition of a specific area and electronic equipment.
Background
The driving recorder is an instrument for recording the image and sound of the vehicle during driving. After the automobile data recorder is installed, the video images and the sound of the whole automobile driving process can be recorded, and evidence can be provided for traffic accidents. People who like self-driving tour can also use it to record the process of overcoming difficult obstructions. The video recording is carried out while driving, and the time, the speed and the position are recorded in the video recording, so that the video recording device is a black box. The system can also be used as DV shooting life pleasure at home, or used as home monitoring, and can also be used for parking monitoring at ordinary times.
The existing automobile data recorder has the advantages that pictures shot under the condition of poor illumination are fuzzy, image details such as license plates cannot be obtained, and inconvenience is brought to an automobile owner to view videos afterwards.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a method and a device for improving the image definition of a specific area and electronic equipment, and aims to solve the problem that in the prior art, under the condition of poor illumination, pictures shot by a vehicle data recorder are blurred, license plate information cannot be obtained, and inconvenience is brought to a vehicle owner to view videos afterwards.
The technical scheme of the invention is as follows:
the first embodiment of the invention provides a method for improving the image definition of a specific area, which is applied to a vehicle event data recorder and comprises the following steps:
acquiring the illumination condition of the current ambient light;
if the illumination condition of the current ambient light is detected to meet the preset condition, controlling to change the exposure parameter of the camera;
carrying out video acquisition in a long exposure and short exposure alternating mode, and respectively generating a corresponding long exposure video and a corresponding short exposure video;
processing an image in the short-exposure video, and extracting a region image corresponding to a specific region;
and acquiring the position of a specific area in the long-exposure video, recording the position as a target position, and pasting the area image back to the target position to generate a target image.
Further, the acquiring the illumination condition of the current ambient light includes:
illuminance data of current ambient light is acquired.
Further, if it is detected that the illumination condition of the current ambient light satisfies the preset condition, controlling to change the exposure parameter of the camera, including:
and if the detected illumination of the current ambient light is smaller than the preset illumination threshold, controlling to change the exposure parameters of the camera.
Further, before the video acquisition is performed in an alternating manner of long exposure and short exposure to generate the corresponding long exposure video and short exposure video, the method further includes:
the proportional relation between the long exposure and the short exposure in the preset time is preset.
Further, the video acquisition is performed in an alternating manner of long exposure and short exposure, and the corresponding long exposure video and short exposure video are respectively generated, including:
carrying out long exposure shooting according to preset first exposure time to generate a long exposure video, wherein the preset first exposure time is more than or equal to first preset time;
and carrying out short exposure shooting according to a preset second exposure time to generate a short exposure video, wherein the preset second exposure time is less than or equal to a second preset time length.
Further, when the specific area is a license plate area of the vehicle, extracting an area image corresponding to the specific area after processing the image in the short-exposure video includes:
acquiring a short-exposure video frame in a short-exposure video, and carrying out image recognition on the short-exposure video frame to acquire a license plate area of a vehicle;
and after the license plate area of the vehicle is subjected to brightness processing, extracting an area image corresponding to the license plate area.
Further, the acquiring a position of a specific region in the long-exposure video, which is recorded as a target position, and attaching the region image back to the target position to generate a target image includes:
acquiring a long exposure video frame corresponding to the short exposure video frame in the long exposure video;
carrying out image recognition on the long exposure video frame to obtain a license plate area of the vehicle, cutting the license plate area, and recording the position of the license plate area as a target position;
and pasting the area image back to the target position to generate a target image.
Another embodiment of the present invention provides an apparatus for improving image sharpness of a specific area, which is applied to a vehicle event data recorder, and includes:
the illumination condition acquisition module is used for acquiring the illumination condition of the current ambient light;
the exposure parameter control module is used for controlling and changing the exposure parameters of the camera if the illumination condition of the current ambient light is detected to meet the preset condition;
the video acquisition module is used for acquiring videos in a long exposure and short exposure alternating mode and respectively generating corresponding long exposure videos and short exposure videos;
the region image extraction module is used for extracting a region image corresponding to the specific region after processing the image in the short-exposure video;
and the image attaching module is used for acquiring the position of a specific area in the long-exposure video, recording the position as a target position, and attaching the area image back to the target position to generate a target image.
Another embodiment of the present invention provides an electronic device comprising at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method for improving sharpness of a specific area as described above.
Another embodiment of the present invention also provides a non-transitory computer-readable storage medium storing computer-executable instructions, which when executed by one or more processors, may cause the one or more processors to perform the above-mentioned method for improving the sharpness of an image in a specific area.
Has the advantages that: according to the embodiment of the invention, after long exposure and short exposure are alternately shot under the condition of poor illumination conditions, the specific area in the image shot by the short exposure is back attached to the corresponding position of the long exposure image after the brightness of the specific area is improved, so that the image definition of the automobile data recorder is improved.
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The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flowchart illustrating a method for improving the image sharpness of a specific area according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of image processing of a specific area according to a preferred embodiment of the apparatus for improving image sharpness of the specific area of the present invention;
FIG. 3 is a functional block diagram of an apparatus for improving the image sharpness of a specific area according to a preferred embodiment of the present invention;
fig. 4 is a schematic diagram of a hardware structure of an electronic device according to a preferred embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is described in further detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Embodiments of the present invention will be described below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a flowchart of a method for improving image sharpness of a specific area according to a preferred embodiment of the present invention. As shown in fig. 1, it includes the steps of:
s100, acquiring the illumination condition of the current ambient light;
s200, if the illumination condition of the current ambient light is detected to meet the preset condition, controlling to change the exposure parameter of the camera;
step S300, video acquisition is carried out in a long exposure and short exposure alternating mode, and corresponding long exposure video and short exposure video are respectively generated;
step S400, extracting a region image corresponding to a specific region after processing an image in the short-exposure video;
step S500, acquiring the position of a specific area in the long-exposure video, recording the position as a target position, and pasting the area image back to the target position to generate a target image.
In specific implementation, the embodiment of the invention is applied to the automobile data recorder. Acquiring the illumination of the current ambient light; when the illumination condition of the current ambient light is detected to meet the preset condition, controlling to change the exposure parameter of the camera; shooting by using long exposure, and then shooting in a short exposure mode to respectively generate a long exposure video and a short exposure video; acquiring a short-exposure image frame, and extracting a region image corresponding to a specific region after the brightness of the short-exposure image is improved; and pasting the specific area back to the corresponding position of the long exposure image frame to generate a target image.
In one embodiment, acquiring the illumination condition of the current ambient light comprises:
illuminance data of current ambient light is acquired.
In specific implementation, the embodiment of the invention mainly represents the illumination condition through illumination and judges the illumination condition of the current ambient light by measuring the illumination data of the current ambient light. In some other embodiments, a light-sensitive sensor may also be used for light condition measurements.
In one embodiment, if it is detected that the illumination condition of the current ambient light satisfies a preset condition, controlling to change an exposure parameter of the camera includes:
and if the detected illumination of the current ambient light is smaller than the preset illumination threshold, controlling to change the exposure parameters of the camera.
When the illumination of the detected environment light is smaller than the preset illumination threshold, the current illumination condition is judged to be bad, so that parameters such as exposure time of the camera and the like are controlled to be changed, and the camera enters an exposure mode with alternate long exposure and short exposure.
In one embodiment, before performing video acquisition in an alternating manner of long exposure and short exposure and generating corresponding long exposure video and short exposure video, the method further includes:
the proportional relation between the long exposure and the short exposure in the preset time is preset.
In specific implementation, the long exposure and the short exposure are in a proportional relationship in advance. Taking the predetermined time as 1s as an example, if there are 30 frames of images in 1s, it can be set that within 30 frames of one second, there are 25 frames of long exposure and 5 frames of short exposure. Note that the proportion of the long and short exposures may be changed, and may be set to 15 frames long exposure and 15 frames short exposure within 30 frames per second.
Further, video acquisition is carried out through the mode that long exposure and short exposure are alternated, respectively generate corresponding long exposure video and short exposure video, include:
carrying out long exposure shooting according to preset first exposure time to generate a long exposure video, wherein the preset first exposure time is more than or equal to first preset time;
and carrying out short exposure shooting according to a preset second exposure time to generate a short exposure video, wherein the preset second exposure time is less than or equal to a second preset time length.
In specific implementation, generally, two video records are formed by the frames with long and short exposures, and a user can separately look up the original video information.
And carrying out long exposure shooting according to the preset first exposure time to generate a long exposure video. For example, the first predetermined time period is 20ms, and preferably, the preset first exposure time may be set to 30 ms.
And performing short-exposure shooting according to a preset second exposure time to generate a short-exposure video, wherein the second preset time is 5ms, for example, and the preferential preset second exposure time can be set to 3-5 ms.
In one embodiment, when the specific area is a license plate area of a vehicle, extracting an area image corresponding to the specific area after processing the image in the short-exposure video includes:
acquiring a short-exposure video frame in a short-exposure video, and carrying out image recognition on the short-exposure video frame to acquire a license plate area of a vehicle;
and after the license plate area of the vehicle is subjected to brightness processing, extracting an area image corresponding to the license plate area.
In specific implementation, a specific area is taken as a license plate area of a vehicle for example, a short-exposure video frame in a short-exposure video is obtained, image recognition is carried out on the short-exposure video frame, and the license plate area of the vehicle is obtained; after the brightness of the license plate region of the vehicle is improved through a brightness processing algorithm, the region image corresponding to the license plate region is extracted.
In one embodiment, acquiring the position of a specific area in a long-exposure video, and pasting the area image back to the target position to generate a target image, includes:
acquiring a long exposure video frame corresponding to the short exposure video frame in the long exposure video;
carrying out image recognition on the long exposure video frame to obtain a license plate area of the vehicle, cutting the license plate area, and recording the position of the license plate area as a target position;
and pasting the area image back to the target position to generate a target image.
In the specific implementation, if a good shooting effect is needed at night, the exposure time is long (about 30 milliseconds), and if the vehicle moves in the period, a fuzzy smear phenomenon is formed. If a shorter exposure time (3-5 ms) is used, the vehicle moves only a small distance during the exposure and the picture taken shows substantially no blurred smear.
The embodiment of the invention obtains a long exposure video frame corresponding to a short exposure video frame in a long exposure video; carrying out image recognition on the long exposure video frame to obtain a license plate area of the vehicle, cutting the license plate area, and recording the position of the license plate area as a target position; and the region image extracted from the short-exposure video is attached back to the target position to generate a target image, so that the image fusion of the short-exposure video frame and the long-exposure video frame is realized, and the definition of a specific region is improved.
As shown in fig. 2, small boxes indicate corresponding positions of the long exposure frame to which the image of the license plate region in the short exposure frame is pasted back. It should be noted that the area to be pasted back is not necessarily limited to the license plate, for example, the large box is to paste the whole vehicle back. In fig. 2, the lower image is a short exposure frame and the upper image is a long exposure frame.
The embodiment of the method can be seen from the above, the invention provides a method for improving the image definition of a specific area, and in order to achieve a better viewing effect, post-processing may be performed. For example, since the time difference between long and short frames is only 30ms, the objects between two frames can be considered to be almost one-to-one, and the distortion on the image is very small. Therefore, objects which are the same between two frames can be identified by utilizing the algorithm, the brightness of the objects in the short exposure frame is improved by the algorithm, and the objects are pasted back to the corresponding positions in the long exposure frame, so that under the condition of poor illumination conditions, after long exposure and short exposure are alternately shot, the brightness of a specific area in an image shot by the short exposure is improved, and then the specific area is pasted back to the corresponding position of the long exposure image, and the image definition of the automobile data recorder is improved.
It should be noted that, a certain order does not necessarily exist between the above steps, and those skilled in the art can understand, according to the description of the embodiments of the present invention, that in different embodiments, the above steps may have different execution orders, that is, may be executed in parallel, may also be executed interchangeably, and the like.
Another embodiment of the present invention provides a device for improving image sharpness of a specific area, which is applied to a vehicle event data recorder, and as shown in fig. 3, the device 1 includes:
an illumination condition obtaining module 11, configured to obtain an illumination condition of current ambient light;
the exposure parameter control module 12 is configured to control to change an exposure parameter of the camera if it is detected that the illumination condition of the current ambient light satisfies a preset condition;
the video acquisition module 13 is configured to perform video acquisition in an alternating manner of long exposure and short exposure, and generate a long exposure video and a short exposure video respectively;
the region image extraction module 14 is configured to extract a region image corresponding to the specific region after processing the image in the short-exposure video;
and the image pasting module 15 is configured to acquire a position of a specific region in the long-exposure video, record the position as a target position, and paste the region image back to the target position to generate a target image.
The specific implementation is shown in the method embodiment, and is not described herein again.
Another embodiment of the present invention provides an electronic device, as shown in fig. 4, an electronic device 10 includes:
one or more processors 110 and a memory 120, where one processor 110 is illustrated in fig. 4, the processor 110 and the memory 120 may be connected by a bus or other means, and fig. 4 illustrates a connection by a bus as an example.
The processor 110 is used to implement various control logic for the electronic device 10, which may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a single chip, an ARM (Acorn RISC machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware controls, or any combination of these components. Also, the processor 110 may be any conventional processor, microprocessor, or state machine. Processor 110 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The memory 120 is a non-volatile computer-readable storage medium, and can be used to store a non-volatile software program, a non-volatile computer-executable program, and modules, such as program instructions corresponding to the method for improving the image definition of a specific area in the embodiment of the present invention. The processor 110 executes various functional applications and data processing of the apparatus 10, namely, implements the method for improving the image definition of a specific area in the above-described method embodiment, by executing the nonvolatile software program, instructions and units stored in the memory 120.
The memory 120 may include a storage program area and a storage data area, wherein the storage program area may store an application program required for operating the device, at least one function; the storage data area may store data created according to the use of the device 10, and the like. Further, the memory 120 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 120 optionally includes memory located remotely from processor 110, which may be connected to device 10 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more units are stored in the memory 120, and when executed by the one or more processors 110, perform the method for improving the image definition of the specific area in any of the above-described method embodiments, for example, perform the above-described method steps S100 to S500 in fig. 1.
Embodiments of the present invention provide a non-transitory computer-readable storage medium storing computer-executable instructions for execution by one or more processors, for example, to perform method steps S100-S500 of fig. 1 described above.
By way of example, non-volatile storage media can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), electrically erasable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in many forms such as Synchronous RAM (SRAM), dynamic RAM, (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The disclosed memory controls or memories of the operating environments described herein are intended to comprise one or more of these and/or any other suitable types of memory.
Another embodiment of the present invention provides a computer program product, which includes a computer program stored on a non-volatile computer-readable storage medium, where the computer program includes program instructions, which, when executed by a processor, cause the processor to execute the method for improving the sharpness of an image in a specific area according to the above method embodiment. For example, the method steps S100 to S500 in fig. 1 described above are performed.
The above-described embodiments are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that the embodiments may be implemented by software plus a general hardware platform, and may also be implemented by hardware. Based on such understanding, the above technical solutions essentially or contributing to the related art can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of the various embodiments or some parts of the embodiments.
Conditional language such as "can," "might," or "may" is generally intended to convey that a particular embodiment can include (yet other embodiments do not include) particular features, elements, and/or operations, among others, unless specifically stated otherwise or otherwise understood within the context as used. Thus, such conditional language is also generally intended to imply that features, elements, and/or operations are in any way required for one or more embodiments or that one or more embodiments must include logic for deciding, with or without input or prompting, whether such features, elements, and/or operations are included or are to be performed in any particular embodiment.
What has been described herein in the specification and drawings includes examples of methods and apparatus that can provide improved distinctness of image in a particular area. It will, of course, not be possible to describe every conceivable combination of components and/or methodologies for purposes of describing the various features of the disclosure, but it can be appreciated that many further combinations and permutations of the disclosed features are possible. It is therefore evident that various modifications can be made to the disclosure without departing from the scope or spirit thereof. In addition, or in the alternative, other embodiments of the disclosure may be apparent from consideration of the specification and drawings and from practice of the disclosure as presented herein. It is intended that the examples set forth in this specification and the drawings be considered in all respects as illustrative and not restrictive. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A method for improving the image definition of a specific area is applied to a vehicle event data recorder, and comprises the following steps:
acquiring the illumination condition of the current ambient light;
if the illumination condition of the current ambient light is detected to meet the preset condition, controlling to change the exposure parameter of the camera;
carrying out video acquisition in a long exposure and short exposure alternating mode, and respectively generating a corresponding long exposure video and a corresponding short exposure video;
processing an image in the short-exposure video, and extracting a region image corresponding to a specific region;
and acquiring the position of a specific area in the long-exposure video, recording the position as a target position, and pasting the area image back to the target position to generate a target image.
2. The method of claim 1, wherein the obtaining the lighting condition of the current ambient light comprises:
illuminance data of current ambient light is acquired.
3. The method according to claim 2, wherein the controlling to change the exposure parameter of the camera if it is detected that the illumination condition of the current ambient light satisfies a preset condition comprises:
and if the detected illumination of the current ambient light is smaller than the preset illumination threshold, controlling to change the exposure parameters of the camera.
4. The method of claim 3, wherein before the video capture by alternating long exposure and short exposure and generating corresponding long exposure video and short exposure video, further comprising:
the proportional relation between the long exposure and the short exposure in the preset time is preset.
5. The method of claim 4, wherein the video capture by alternating long exposure and short exposure generates corresponding long exposure video and short exposure video respectively, comprising:
carrying out long exposure shooting according to preset first exposure time to generate a long exposure video, wherein the preset first exposure time is more than or equal to first preset time;
and carrying out short exposure shooting according to a preset second exposure time to generate a short exposure video, wherein the preset second exposure time is less than or equal to a second preset time length.
6. The method according to claim 5, wherein when the specific area is a license plate area of a vehicle, extracting an area image corresponding to the specific area after processing the image in the short-exposure video comprises:
acquiring a short-exposure video frame in a short-exposure video, and carrying out image recognition on the short-exposure video frame to acquire a license plate area of a vehicle;
and after the license plate area of the vehicle is subjected to brightness processing, extracting an area image corresponding to the license plate area.
7. The method according to claim 6, wherein said obtaining a position of a specific area in the long-exposure video, which is denoted as a target position, and pasting the area image back to the target position to generate a target image comprises:
acquiring a long exposure video frame corresponding to the short exposure video frame in the long exposure video;
carrying out image recognition on the long exposure video frame to obtain a license plate area of the vehicle, cutting the license plate area, and recording the position of the license plate area as a target position;
and pasting the area image back to the target position to generate a target image.
8. An apparatus for improving image definition of a specific area, which is applied to a vehicle event data recorder, the apparatus comprising:
the illumination condition acquisition module is used for acquiring the illumination condition of the current ambient light;
the exposure parameter control module is used for controlling and changing the exposure parameters of the camera if the illumination condition of the current ambient light is detected to meet the preset condition;
the video acquisition module is used for acquiring videos in a long exposure and short exposure alternating mode and respectively generating corresponding long exposure videos and short exposure videos;
the region image extraction module is used for extracting a region image corresponding to the specific region after processing the image in the short-exposure video;
and the image attaching module is used for acquiring the position of a specific area in the long-exposure video, recording the position as a target position, and attaching the area image back to the target position to generate a target image.
9. An electronic device, characterized in that the electronic device comprises at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method of improving sharpness of images in a particular region of any of claims 1-7.
10. A non-transitory computer-readable storage medium storing computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform the method of improving the sharpness of images in a specific area of any one of claims 1-7.
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| CN116668804A (en) * | 2023-06-14 | 2023-08-29 | 山东恒辉软件有限公司 | Video image analysis processing method, device and storage medium |
| CN116668804B (en) * | 2023-06-14 | 2023-12-22 | 山东恒辉软件有限公司 | Video image analysis processing method, device and storage medium |
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