CN113327215A - Wide dynamic image synthesis method and device, electronic equipment and storage medium - Google Patents
Wide dynamic image synthesis method and device, electronic equipment and storage medium Download PDFInfo
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- CN113327215A CN113327215A CN202110588694.5A CN202110588694A CN113327215A CN 113327215 A CN113327215 A CN 113327215A CN 202110588694 A CN202110588694 A CN 202110588694A CN 113327215 A CN113327215 A CN 113327215A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/50—Image enhancement or restoration by the use of more than one image, e.g. averaging, subtraction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/95—Computational photography systems, e.g. light-field imaging systems
- H04N23/951—Computational photography systems, e.g. light-field imaging systems by using two or more images to influence resolution, frame rate or aspect ratio
Abstract
The invention discloses a wide dynamic image synthesis method, a wide dynamic image synthesis device, electronic equipment and a storage medium. And then selecting the brightness value of each pixel point in the expanded area in the short frame image as the brightness value of the pixel point at the corresponding position in the synthesized image. The method and the device avoid the problem that the positions of the license plate areas in the long-frame image and the short-frame image are not completely corresponding, and the license plate edge area generates smear when the long-frame image and the short-frame image are synthesized according to the existing wide dynamic image synthesis technology, and consider that the brightness of the license plate area is generally high, the vehicle movement speed is high, the exposure time of the short-frame image is short, and the quality of the license plate area in the obtained synthesized image is good.
Description
Technical Field
The present invention relates to the field of video surveillance technologies, and in particular, to a method and an apparatus for synthesizing a wide dynamic image, an electronic device, and a storage medium.
Background
With the rapid development of the field of video monitoring, a wide dynamic image synthesis technology is developed in order to obtain high-quality images at night or in a wide dynamic range scene with complex illumination intensity. The wide dynamic image synthesis technology is that monitoring equipment is switched to a wide dynamic mode, the monitoring equipment collects long frame images and short frame images at intervals according to a set long-short frame exposure time ratio, and then brightness values of pixel points at corresponding positions of adjacent long frame images and short frame images are superposed to realize wide dynamic image synthesis.
The existing wide dynamic image synthesis technology can ensure that high-quality images are obtained in a wide dynamic range scene to a certain extent, but has certain problems. If a running vehicle exists in a scene, the long frame image and the short frame image have time difference, so that the positions of license plate areas in the long frame image and the short frame image are not completely corresponding, and when the long frame image and the short frame image are synthesized according to the existing wide dynamic image synthesis technology, the license plate edge area generates smear, and the recognition of the license plate is adversely affected.
Disclosure of Invention
The embodiment of the invention provides a wide dynamic image synthesis method and device, electronic equipment and a storage medium, which are used for solving the problem that the edge area of a license plate generates smear when long-frame images and short-frame images are synthesized according to the existing wide dynamic image synthesis technology.
The embodiment of the invention provides a wide dynamic image synthesis method, which comprises the following steps:
acquiring a short frame image and a long frame image to be synthesized, and respectively determining an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located, wherein the first license plate and the second license plate are the same;
determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area;
and aiming at each pixel point in the expanded region in the short frame image, taking the brightness value of the pixel point as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
Further, determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameter, wherein the obtaining of the expanded area comprises the following steps:
taking a horizontal coordinate difference value between a central pixel point of the area where the first license plate is located and a central pixel point of the area where the second license plate is located as a horizontal direction expansion parameter m, and taking a vertical coordinate difference value between the central pixel point of the area where the first license plate is located and the central pixel point of the area where the second license plate is located as a vertical direction expansion parameter n;
and with the central pixel point of the area where the first license plate is located as the center, expanding the width w of the area where the first license plate is located into w +2m, and expanding the height h of the area where the first license plate is located into h +2n to obtain an expanded area.
Further, the method further comprises:
dividing the area outside the expanded area in the short frame image into a preset number of first sub-areas according to a preset rule; determining a second sub-area corresponding to each first sub-area in the long-frame image;
determining a first average brightness value of pixel points in each first sub-region; for each second sub-area, determining a second average brightness value of the pixel points in the second sub-area;
determining a first sub-region corresponding to a first average brightness value within a preset target brightness range and a second sub-region corresponding to a second average brightness value within the preset target brightness range as a third sub-region;
and taking the brightness value of each pixel point in the third sub-area as the brightness value of the pixel point corresponding to the position of each pixel point in the third sub-area in the synthesized image.
Further, the method further comprises:
determining a third sub-region in the short frame image and a sub-region in the short frame image corresponding to the third sub-region in the long frame image as a fourth sub-region; determining a region of the short frame image except the fourth sub-region and the expanded region as a fifth sub-region;
determining a third average brightness value of pixel points in each fifth sub-region, and determining the frame number of the short frame image to be superimposed according to the preset target brightness range and the third average brightness value; and acquiring short frame images to be superposed of the frame number, and superposing the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in each short frame image to be superposed to obtain the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in the synthesized image.
In another aspect, an embodiment of the present invention provides a wide dynamic image synthesizing apparatus, including:
the device comprises a determining module, a processing module and a processing module, wherein the determining module is used for acquiring a short frame image and a long frame image to be synthesized, and respectively determining an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located, wherein the first license plate and the second license plate are the same;
the expansion module is used for determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area;
and the synthesis module is used for taking the brightness value of each pixel point in the expanded region in the short frame image as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
Further, the expansion module is specifically configured to use a horizontal coordinate difference value between a center pixel point of the area where the first license plate is located and a center pixel point of the area where the second license plate is located as a horizontal direction expansion parameter m, and use a vertical coordinate difference value between the center pixel point of the area where the first license plate is located and the center pixel point of the area where the second license plate is located as a vertical direction expansion parameter n; and with the central pixel point of the area where the first license plate is located as the center, expanding the width w of the area where the first license plate is located into w +2m, and expanding the height h of the area where the first license plate is located into h +2n to obtain an expanded area.
Further, the synthesis module is further configured to divide a region outside the expanded region in the short frame image into a preset number of first sub-regions according to a preset rule; determining a second sub-area corresponding to each first sub-area in the long-frame image; determining a first average brightness value of pixel points in each first sub-region; for each second sub-area, determining a second average brightness value of the pixel points in the second sub-area; determining a first sub-region corresponding to a first average brightness value within a preset target brightness range and a second sub-region corresponding to a second average brightness value within the preset target brightness range as a third sub-region; and taking the brightness value of each pixel point in the third sub-area as the brightness value of the pixel point corresponding to the position of each pixel point in the third sub-area in the synthesized image.
Further, the synthesis module is further configured to determine a third sub-region in the short frame image and a sub-region in the short frame image corresponding to the third sub-region in the long frame image as a fourth sub-region; determining a region of the short frame image except the fourth sub-region and the expanded region as a fifth sub-region; determining a third average brightness value of pixel points in each fifth sub-region, and determining the frame number of the short frame image to be superimposed according to the preset target brightness range and the third average brightness value; and acquiring short frame images to be superposed of the frame number, and superposing the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in each short frame image to be superposed to obtain the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in the synthesized image.
On the other hand, the embodiment of the invention provides electronic equipment, which comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus;
a memory for storing a computer program;
a processor for implementing any of the above method steps when executing a program stored in the memory.
In another aspect, an embodiment of the present invention provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the method steps of any one of the above.
The embodiment of the invention provides a wide dynamic image synthesis method, a wide dynamic image synthesis device, electronic equipment and a storage medium, wherein the method comprises the following steps: acquiring a short frame image and a long frame image to be synthesized, and respectively determining an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located, wherein the first license plate and the second license plate are the same; determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area; and aiming at each pixel point in the expanded region in the short frame image, taking the brightness value of the pixel point as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
The technical scheme has the following advantages or beneficial effects:
in the embodiment of the invention, when the wide dynamic image is synthesized, the area expansion parameter is determined according to the first position information of the area where the first license plate is located in the short frame image and the second position information of the area where the second license plate is located in the long frame image, and the first license plate area is expanded according to the area expansion parameter to obtain the expanded area. And then selecting the brightness value of each pixel point in the expanded region in the short frame image as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image. The method and the device avoid the problem that the positions of the license plate areas in the long-frame image and the short-frame image are not completely corresponding, and the license plate edge area generates smear when the long-frame image and the short-frame image are synthesized according to the existing wide dynamic image synthesis technology, and consider that the brightness of the license plate area is generally high, the vehicle movement speed is high, and the exposure time of the short-frame image is short, so that the quality of the license plate area in the obtained synthesized image is good.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a wide dynamic image synthesis process provided in embodiment 1 of the present invention;
FIG. 2 is a schematic view of an enlarged area provided in embodiment 2 of the present invention;
FIG. 3 is a flowchart of the wide dynamic image synthesis provided in embodiment 4 of the present invention;
FIG. 4 is a detailed flowchart of the wide dynamic image composition provided in embodiment 4 of the present invention;
fig. 5 is a schematic structural diagram of a wide dynamic image synthesizing apparatus according to embodiment 5 of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to embodiment 6 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
fig. 1 is a schematic diagram of a wide dynamic image synthesis process provided by an embodiment of the present invention, where the process includes the following steps:
s101: the method comprises the steps of obtaining a short frame image and a long frame image to be synthesized, and respectively determining an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located, wherein the first license plate and the second license plate are the same license plate.
S102: determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; and expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area.
S103: and aiming at each pixel point in the expanded region in the short frame image, taking the brightness value of the pixel point as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
The wide dynamic image synthesis method provided by the embodiment of the invention is applied to electronic equipment, and the electronic equipment can be equipment such as a PC (personal computer), a tablet personal computer and the like, and can also be image acquisition equipment. If the electronic equipment is image acquisition equipment, after the image acquisition equipment is switched to a wide dynamic mode, long-frame images and short-frame images are acquired at intervals according to the set long-frame and short-frame exposure time ratio, and then the adjacent short-frame images and long-frame images are used as the short-frame images and long-frame images to be synthesized, and the subsequent synthesis is carried out. If the electronic equipment is a PC, a tablet computer and the like, after the image acquisition equipment is switched to a wide dynamic mode, long-frame images and short-frame images are acquired at intervals according to the set long-frame and short-frame exposure time ratio, then the adjacent short-frame images and long-frame images are sent to the electronic equipment, and after the electronic equipment acquires the short-frame images and the long-frame images to be synthesized, the electronic equipment carries out subsequent synthesis.
In the embodiment of the invention, after the electronic equipment acquires the short frame image and the long frame image to be synthesized, the area where the first license plate in the short frame image is located and the area where the second license plate which is the same as the first license plate in the long frame image is located are respectively determined through a target recognition algorithm. The electronic equipment determines the area expansion parameter according to the first position information of the area where the first license plate is located and the second position information of the area where the second license plate is located. For example, the absolute value of the difference between the horizontal coordinates of the left edge pixel point of the area where the first license plate is located and the left edge pixel point of the area where the second license plate is located is used as the expansion parameter of the left edge of the area where the first license plate is located, the absolute value of the difference between the horizontal coordinates of the right edge pixel point of the area where the first license plate is located and the horizontal coordinate of the right edge pixel point of the area where the second license plate is located is used as the expansion parameter of the right edge of the area where the first license plate is located, the absolute value of the difference between the vertical coordinates of the upper edge pixel point of the area where the first license plate is located and the vertical coordinate of the upper edge pixel point of the area where the second license plate is located is used as the expansion parameter of the upper edge of the area where the first license plate is located, and taking the absolute value of the difference value of the vertical coordinates of the lower edge pixel point of the area where the first license plate is located and the lower edge pixel point of the area where the second license plate is located as the expansion parameter of the lower edge of the area where the first license plate is located. And then expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area. Or the area where the second license plate is located may be mapped into the short-frame image, and then the minimum bounding rectangle of the area where the first license plate is located and the area where the second license plate is located is determined in the short-frame image as the expanded area in the short-frame image. Aiming at each pixel point in the expanded region in the short frame image, the brightness value of the pixel point is used as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
In the embodiment of the invention, when the wide dynamic image is synthesized, the area expansion parameter is determined according to the first position information of the area where the first license plate is located in the short frame image and the second position information of the area where the second license plate is located in the long frame image, and the first license plate area is expanded according to the area expansion parameter to obtain the expanded area. And then selecting the brightness value of each pixel point in the expanded region in the short frame image as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image. The method and the device avoid the problem that the positions of the license plate areas in the long-frame image and the short-frame image are not completely corresponding, and the license plate edge area generates smear when the long-frame image and the short-frame image are synthesized according to the existing wide dynamic image synthesis technology, and consider that the brightness of the license plate area is generally high, the vehicle movement speed is high, and the exposure time of the short-frame image is short, so that the quality of the license plate area in the obtained synthesized image is good.
Example 2:
in order to determine the expanded area more accurately, on the basis of the above embodiment, in an embodiment of the present invention, the area expansion parameter is determined according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameter, wherein the obtaining of the expanded area comprises the following steps:
taking a horizontal coordinate difference value between a central pixel point of the area where the first license plate is located and a central pixel point of the area where the second license plate is located as a horizontal direction expansion parameter m, and taking a vertical coordinate difference value between the central pixel point of the area where the first license plate is located and the central pixel point of the area where the second license plate is located as a vertical direction expansion parameter n;
and with the central pixel point of the area where the first license plate is located as the center, expanding the width w of the area where the first license plate is located into w +2m, and expanding the height h of the area where the first license plate is located into h +2n to obtain an expanded area.
In the embodiment of the invention, the electronic equipment respectively determines the coordinate information of the central pixel point of the area where the first license plate is located and the coordinate information of the central pixel point of the area where the second license plate is located. And determining a horizontal coordinate difference value between a central pixel point of the area where the first license plate is located and a central pixel point of the area where the second license plate is located as a horizontal direction expansion parameter m. Preferably, the absolute value of the difference between the horizontal coordinates of the central pixel point of the area where the first license plate is located and the central pixel point of the area where the second license plate is located is used as the horizontal direction expansion parameter m. And taking the difference value of the vertical coordinates of the central pixel point of the area where the first license plate is located and the central pixel point of the area where the second license plate is located as a vertical direction expansion parameter n. Preferably, the absolute value of the difference between the vertical coordinates of the central pixel point of the area where the first license plate is located and the central pixel point of the area where the second license plate is located is used as the vertical expansion parameter n. In the embodiment of the present invention, as shown in fig. 2, the center pixel point of the area where the first license plate is located is used as the center, the width w of the area where the first license plate is located is expanded to w +2m, and the height h of the area where the first license plate is located is expanded to h +2n, so as to obtain the expanded area. Namely, the left edge of the area where the first license plate is located is expanded by m leftwards, the right edge of the area where the first license plate is located is expanded by m rightwards, the upper edge of the area where the first license plate is located is expanded by n upwards, and the lower edge of the area where the first license plate is located is expanded by n downwards, so that the expanded area is obtained.
Example 3:
in order to make the synthesized other regions except the license plate region have better quality, on the basis of the above embodiments, in an embodiment of the present invention, the method further includes:
dividing the area outside the expanded area in the short frame image into a preset number of first sub-areas according to a preset rule; determining a second sub-area corresponding to each first sub-area in the long-frame image;
determining a first average brightness value of pixel points in each first sub-region; for each second sub-area, determining a second average brightness value of the pixel points in the second sub-area;
determining a first sub-region corresponding to a first average brightness value within a preset target brightness range and a second sub-region corresponding to a second average brightness value within the preset target brightness range as a third sub-region;
and taking the brightness value of each pixel point in the third sub-area as the brightness value of the pixel point corresponding to the position of each pixel point in the third sub-area in the synthesized image.
In the embodiment of the invention, the electronic device divides the area outside the expanded area in the short frame image into the first sub-areas with the preset number according to the preset rule. For example, the electronic device divides the short frame image into P parts in the horizontal direction and Q parts in the vertical direction on average, resulting in P × Q regions, and then takes the region of the P × Q regions other than the expanded region as the first sub-region. Then, a second sub-region corresponding to each first sub-region position in the long-frame image is determined.
The electronic equipment determines a first average brightness value of pixel points in each first sub-area; and determining a second average brightness value of the pixel points in each second sub-area. And a preset target brightness range is saved in the electronic equipment, and for each first sub-region, when the first average brightness value of the pixel points in the first sub-region belongs to the preset target brightness range, the first sub-region is taken as a third sub-region. And regarding each second sub-area, when the second average brightness value of the pixel points in the second sub-area belongs to a preset target brightness range, taking the second sub-area as a third sub-area.
For example, the first sub-region in the short frame image includes sub-regions a1, a2 … … ax, and the second sub-region in the long frame image includes sub-regions b1, b2 … … bx. It is determined that the first sub-regions corresponding to the first average brightness values within the preset target brightness range in the short-frame image are a1, a2 and a3, and the second sub-regions corresponding to the second average brightness values within the preset target brightness range in the long-frame image are b10, b20 and b 25. The first sub-region a1, a2, a3 and the second sub-region b10, b20, b25 are determined as a third sub-region. And taking the brightness value of each pixel point in the third sub-area as the brightness value of the pixel point at the corresponding position in the synthesized image. In the synthesized image, the brightness value of the pixel point in the sub-region corresponding to the position a1 is the same as the brightness value of each pixel point in the first sub-region a 1; the brightness value of the pixel points in the sub-region at the position corresponding to the a2 is the same as the brightness value of each pixel point in the first sub-region a 2; the brightness value of the pixel points in the sub-region at the position corresponding to the a3 is the same as the brightness value of each pixel point in the first sub-region a 3; the brightness value of the pixel points in the sub-region at the position corresponding to the b10 is the same as the brightness value of each pixel point in the second sub-region b 10; the brightness value of the pixel points in the sub-region at the position corresponding to the b20 is the same as the brightness value of each pixel point in the second sub-region b 20; the brightness value of the pixel points in the sub-region at the corresponding position of b25 is the same as the brightness value of each pixel point in the second sub-region b 25.
It should be noted that, because the difference between the exposure times of the long frame image and the short frame image is large, the average brightness values of the pixel points in the sub-regions at the same position in the long frame image and the short frame image generally do not belong to the preset target brightness range at the same time. Under a special condition, if the average brightness values of the pixel points in the sub-regions at the same position in the long frame image and the short frame image belong to the preset target brightness range at the same time, the brightness value of each pixel point in any one of the sub-regions at the same position can be used as the brightness value of the pixel point corresponding to each pixel point position in the third sub-region in the synthesized image.
In the embodiment of the invention, the area outside the expanded area in the short frame image is divided into the first sub-areas with the preset number according to the preset rule; determining a second sub-area corresponding to the position of each first sub-area in the long-frame image; determining a first sub-region corresponding to a first average brightness value within a preset target brightness range and a second sub-region corresponding to a second average brightness value within the preset target brightness range as a third sub-region; and taking the brightness value of each pixel point in the third sub-area as the brightness value of the pixel point corresponding to the position of each pixel point in the third sub-area in the synthesized image. The quality of other areas outside the license plate area is better after synthesis.
Example 4:
in order to further improve the quality of the synthesized license plate region, based on the above embodiments, in an embodiment of the present invention, the method further includes:
determining a third sub-region in the short frame image and a sub-region in the short frame image corresponding to the third sub-region in the long frame image as a fourth sub-region; determining a region of the short frame image except the fourth sub-region and the expanded region as a fifth sub-region;
determining a third average brightness value of pixel points in each fifth sub-region, and determining the frame number of the short frame image to be superimposed according to the preset target brightness range and the third average brightness value; and acquiring short frame images to be superposed of the frame number, and superposing the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in each short frame image to be superposed to obtain the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in the synthesized image.
In the embodiment of the present invention, the sub-region in the short frame image corresponding to the third sub-region in the long frame image is determined as the fourth sub-region, the third sub-region in the short frame image is determined as the fourth sub-region, and then the region in the short frame image excluding the fourth sub-region and the expanded region is determined as the fifth sub-region.
And determining a third average brightness value of the pixel points in the fifth sub-area aiming at each fifth sub-area. And determining the frame number of the short frame image to be superposed according to the preset target brightness range and the third average brightness value. Specifically, a ratio range of a preset target brightness range and a third average brightness value is calculated, and any ratio in the ratio range is the frame number of the short frame image to be superimposed. And acquiring the short frame image to be superposed of the frame number, wherein the short frame image to be superposed of the frame number before the currently synthesized short frame image can be acquired, and the short frame image to be superposed of the frame number after the currently synthesized short frame image can also be acquired. And then, superposing the brightness value of the pixel point corresponding to the pixel point position in the fifth sub-area in each short frame image to be superposed to obtain the brightness value of the pixel point corresponding to each pixel point position in the fifth sub-area in the synthesized image.
For example, the number of frames of the short frame images to be superimposed determined by the fifth sub-region a5 is 3, the 3 short frame images to be superimposed are acquired, and the luminance values of the pixels corresponding to the pixel positions in the fifth sub-region a5 in each short frame image to be superimposed are superimposed to obtain the luminance values of the pixels corresponding to the fifth sub-region a5 in the synthesized image. And aiming at the frame number of the short frame image to be superposed determined by the fifth subregion a6 as 4 frames, acquiring 4 short frame images to be superposed, superposing the brightness value of the pixel point corresponding to the pixel point position in the fifth subregion a6 in each short frame image to be superposed, and obtaining the brightness value of the pixel point corresponding to the fifth subregion a6 in the synthesized image.
In the embodiment of the invention, for each fifth sub-region, a third average brightness value of the pixel points in the fifth sub-region is determined, and the frame number of the short frame image to be superimposed is determined according to the preset target brightness range and the third average brightness value; and acquiring short frame images to be superposed of the frame number, and superposing the brightness values of the pixel points corresponding to the pixel points in the fifth sub-area in each short frame image to be superposed to obtain the brightness values of the pixel points at the corresponding positions in the synthesized image. And further, other areas except the license plate area are better in quality after being synthesized.
Fig. 3 is a flowchart of a wide dynamic image synthesis process provided by an embodiment of the present invention, and as shown in fig. 3, the image capturing device switches to the wide dynamic mode, and the Sensor outputs a short frame image and a long frame image. The short frame image and the long frame image are subjected to ISP processing, that is, wide dynamic image synthesis. After the wide dynamic image is synthesized, the vehicle detection, the license plate positioning, the license plate recognition and other processing can be sequentially carried out.
Fig. 4 is a detailed flowchart of the wide dynamic image synthesis provided by the embodiment of the present invention, which includes the following steps:
s201: the method comprises the steps of obtaining a short frame image and a long frame image to be synthesized, and respectively determining an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located, wherein the first license plate and the second license plate are the same license plate.
S202: determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; and expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area.
S203: and aiming at each pixel point in the expanded region in the short frame image, taking the brightness value of the pixel point as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
S204: dividing the area outside the expanded area in the short frame image into a preset number of first sub-areas according to a preset rule; and determining a second sub-region corresponding to the position of each first sub-region in the long-frame image.
S205: determining a first average brightness value of pixel points in each first sub-region; and determining a second average brightness value of the pixel points in each second sub-area.
S206: and determining a first sub-region corresponding to a first average brightness value within a preset target brightness range and a second sub-region corresponding to a second average brightness value within the preset target brightness range as a third sub-region.
S207: and taking the brightness value of each pixel point in the third sub-area as the brightness value of the pixel point corresponding to the position of each pixel point in the third sub-area in the synthesized image.
S208: determining a third sub-region in the short frame image and a sub-region in the short frame image corresponding to the third sub-region in the long frame image as a fourth sub-region; determining a region of the short frame image other than the fourth sub-region and the expanded region as a fifth sub-region.
S209: determining a third average brightness value of pixel points in each fifth sub-region, and determining the frame number of the short frame image to be superimposed according to the preset target brightness range and the third average brightness value; and acquiring short frame images to be superposed of the frame number, and superposing the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in each short frame image to be superposed to obtain the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in the synthesized image.
Example 5:
fig. 5 is a schematic structural diagram of a wide dynamic image synthesizing apparatus according to an embodiment of the present invention, including:
the determining module 51 is configured to acquire a short frame image and a long frame image to be synthesized, and respectively determine an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located, where the first license plate and the second license plate are the same license plate;
the expansion module 52 is configured to determine an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area;
and a synthesizing module 53, configured to, for each pixel point in the expanded region in the short frame image, use the luminance value of the pixel point as the luminance value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
The expansion module 52 is specifically configured to use a horizontal coordinate difference between a center pixel point of the area where the first license plate is located and a center pixel point of the area where the second license plate is located as a horizontal expansion parameter m, and use a vertical coordinate difference between the center pixel point of the area where the first license plate is located and the center pixel point of the area where the second license plate is located as a vertical expansion parameter n; and with the central pixel point of the area where the first license plate is located as the center, expanding the width w of the area where the first license plate is located into w +2m, and expanding the height h of the area where the first license plate is located into h +2n to obtain an expanded area.
The synthesis module 53 is further configured to divide an area outside the expanded area in the short frame image into a preset number of first sub-areas according to a preset rule; determining a second sub-area corresponding to each first sub-area in the long-frame image; determining a first average brightness value of pixel points in each first sub-region; for each second sub-area, determining a second average brightness value of the pixel points in the second sub-area; determining a first sub-region corresponding to a first average brightness value within a preset target brightness range and a second sub-region corresponding to a second average brightness value within the preset target brightness range as a third sub-region; and taking the brightness value of each pixel point in the third sub-area as the brightness value of the pixel point corresponding to the position of each pixel point in the third sub-area in the synthesized image.
The synthesis module 53 is further configured to determine a third sub-region in the short frame image and a sub-region in the short frame image corresponding to the third sub-region in the long frame image as a fourth sub-region; determining a region of the short frame image except the fourth sub-region and the expanded region as a fifth sub-region; determining a third average brightness value of pixel points in each fifth sub-region, and determining the frame number of the short frame image to be superimposed according to the preset target brightness range and the third average brightness value; and acquiring short frame images to be superposed of the frame number, and superposing the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in each short frame image to be superposed to obtain the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in the synthesized image.
Example 6:
on the basis of the foregoing embodiments, an embodiment of the present invention further provides an electronic device, as shown in fig. 6, including: the system comprises a processor 301, a communication interface 302, a memory 303 and a communication bus 304, wherein the processor 301, the communication interface 302 and the memory 303 complete mutual communication through the communication bus 304;
the memory 303 has stored therein a computer program which, when executed by the processor 301, causes the processor 301 to perform the steps of:
acquiring a short frame image and a long frame image to be synthesized, and respectively determining an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located, wherein the first license plate and the second license plate are the same;
determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area;
and aiming at each pixel point in the expanded region in the short frame image, taking the brightness value of the pixel point as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
Based on the same inventive concept, the embodiment of the present invention further provides an electronic device, and as the principle of the electronic device for solving the problem is similar to the wide dynamic image synthesis method, the implementation of the electronic device may refer to the implementation of the method, and repeated details are not repeated.
The electronic device provided by the embodiment of the invention can be a desktop computer, a portable computer, a smart phone, a tablet computer, a Personal Digital Assistant (PDA), a network side device and the like.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface 302 is used for communication between the above-described electronic apparatus and other apparatuses.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Alternatively, the memory may be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a central processing unit, a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like.
When a processor executes a program stored in a memory, the short-frame image and the long-frame image to be synthesized are acquired, and the area where a first license plate in the short-frame image is located and the area where a second license plate in the long-frame image is located are respectively determined, wherein the first license plate and the second license plate are the same license plate; determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area; and aiming at each pixel point in the expanded region in the short frame image, taking the brightness value of the pixel point as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
In the embodiment of the invention, when the wide dynamic image is synthesized, the area expansion parameter is determined according to the first position information of the area where the first license plate is located in the short frame image and the second position information of the area where the second license plate is located in the long frame image, and the first license plate area is expanded according to the area expansion parameter to obtain the expanded area. And then selecting the brightness value of each pixel point in the expanded region in the short frame image as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image. The method and the device avoid the problem that the positions of the license plate areas in the long-frame image and the short-frame image are not completely corresponding, and the license plate edge area generates smear when the long-frame image and the short-frame image are synthesized according to the existing wide dynamic image synthesis technology, and consider that the brightness of the license plate area is generally high, the vehicle movement speed is high, and the exposure time of the short-frame image is short, so that the quality of the license plate area in the obtained synthesized image is good.
Example 7:
on the basis of the foregoing embodiments, an embodiment of the present invention further provides a computer storage readable storage medium, in which a computer program executable by an electronic device is stored, and when the program is run on the electronic device, the electronic device is caused to execute the following steps:
acquiring a short frame image and a long frame image to be synthesized, and respectively determining an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located, wherein the first license plate and the second license plate are the same;
determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area;
and aiming at each pixel point in the expanded region in the short frame image, taking the brightness value of the pixel point as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
Based on the same inventive concept, embodiments of the present invention further provide a computer-readable storage medium, and since a principle of solving a problem when a processor executes a computer program stored in the computer-readable storage medium is similar to that of a wide dynamic image synthesis method, implementation of the computer program stored in the computer-readable storage medium by the processor may refer to implementation of the method, and repeated details are not repeated.
The computer readable storage medium may be any available medium or data storage device that can be accessed by a processor in an electronic device, including but not limited to magnetic memory such as floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc., optical memory such as CDs, DVDs, BDs, HVDs, etc., and semiconductor memory such as ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs), etc.
The computer program is stored in a computer readable storage medium provided in the embodiment of the invention, and when being executed by a processor, the computer program realizes that a short frame image and a long frame image to be synthesized are obtained, and an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located are respectively determined, wherein the first license plate and the second license plate are the same license plate; determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area; and aiming at each pixel point in the expanded region in the short frame image, taking the brightness value of the pixel point as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
In the embodiment of the invention, when the wide dynamic image is synthesized, the area expansion parameter is determined according to the first position information of the area where the first license plate is located in the short frame image and the second position information of the area where the second license plate is located in the long frame image, and the first license plate area is expanded according to the area expansion parameter to obtain the expanded area. And then selecting the brightness value of each pixel point in the expanded region in the short frame image as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image. The method and the device avoid the problem that the positions of the license plate areas in the long-frame image and the short-frame image are not completely corresponding, and the license plate edge area generates smear when the long-frame image and the short-frame image are synthesized according to the existing wide dynamic image synthesis technology, and consider that the brightness of the license plate area is generally high, the vehicle movement speed is high, and the exposure time of the short-frame image is short, so that the quality of the license plate area in the obtained synthesized image is good.
The present invention is 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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for synthesizing a wide dynamic image, the method comprising:
acquiring a short frame image and a long frame image to be synthesized, and respectively determining an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located, wherein the first license plate and the second license plate are the same;
determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area;
and aiming at each pixel point in the expanded region in the short frame image, taking the brightness value of the pixel point as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
2. The method of claim 1, wherein the area expansion parameter is determined based on first location information of an area where the first license plate is located and second location information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameter, wherein the obtaining of the expanded area comprises the following steps:
taking a horizontal coordinate difference value between a central pixel point of the area where the first license plate is located and a central pixel point of the area where the second license plate is located as a horizontal direction expansion parameter m, and taking a vertical coordinate difference value between the central pixel point of the area where the first license plate is located and the central pixel point of the area where the second license plate is located as a vertical direction expansion parameter n;
and with the central pixel point of the area where the first license plate is located as the center, expanding the width w of the area where the first license plate is located into w +2m, and expanding the height h of the area where the first license plate is located into h +2n to obtain an expanded area.
3. The method of claim 1, wherein the method further comprises:
dividing the area outside the expanded area in the short frame image into a preset number of first sub-areas according to a preset rule; determining a second sub-area corresponding to each first sub-area in the long-frame image;
determining a first average brightness value of pixel points in each first sub-region; for each second sub-area, determining a second average brightness value of the pixel points in the second sub-area;
determining a first sub-region corresponding to a first average brightness value within a preset target brightness range and a second sub-region corresponding to a second average brightness value within the preset target brightness range as a third sub-region;
and taking the brightness value of each pixel point in the third sub-area as the brightness value of the pixel point corresponding to the position of each pixel point in the third sub-area in the synthesized image.
4. The method of claim 3, wherein the method further comprises:
determining a third sub-region in the short frame image and a sub-region in the short frame image corresponding to the third sub-region in the long frame image as a fourth sub-region; determining a region of the short frame image except the fourth sub-region and the expanded region as a fifth sub-region;
determining a third average brightness value of pixel points in each fifth sub-region, and determining the frame number of the short frame image to be superimposed according to the preset target brightness range and the third average brightness value; and acquiring short frame images to be superposed of the frame number, and superposing the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in each short frame image to be superposed to obtain the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in the synthesized image.
5. A wide dynamic image synthesizing apparatus, characterized in that the apparatus comprises:
the device comprises a determining module, a processing module and a processing module, wherein the determining module is used for acquiring a short frame image and a long frame image to be synthesized, and respectively determining an area where a first license plate in the short frame image is located and an area where a second license plate in the long frame image is located, wherein the first license plate and the second license plate are the same;
the expansion module is used for determining an area expansion parameter according to first position information of an area where the first license plate is located and second position information of an area where the second license plate is located; expanding the area where the first license plate is located according to the area expansion parameters to obtain an expanded area;
and the synthesis module is used for taking the brightness value of each pixel point in the expanded region in the short frame image as the brightness value of the pixel point corresponding to the position of each pixel point in the expanded region in the synthesized image.
6. The apparatus according to claim 5, wherein the expanding module is specifically configured to use a horizontal expanding parameter m as a difference between horizontal coordinates of a center pixel point of the area where the first license plate is located and a center pixel point of the area where the second license plate is located, and use a vertical expanding parameter n as a difference between vertical coordinates of the center pixel point of the area where the first license plate is located and the center pixel point of the area where the second license plate is located; and with the central pixel point of the area where the first license plate is located as the center, expanding the width w of the area where the first license plate is located into w +2m, and expanding the height h of the area where the first license plate is located into h +2n to obtain an expanded area.
7. The apparatus of claim 5, wherein the synthesizing module is further configured to divide an area other than the enlarged area in the short frame image into a preset number of first sub-areas according to a preset rule; determining a second sub-area corresponding to each first sub-area in the long-frame image; determining a first average brightness value of pixel points in each first sub-region; for each second sub-area, determining a second average brightness value of the pixel points in the second sub-area; determining a first sub-region corresponding to a first average brightness value within a preset target brightness range and a second sub-region corresponding to a second average brightness value within the preset target brightness range as a third sub-region; and taking the brightness value of each pixel point in the third sub-area as the brightness value of the pixel point corresponding to the position of each pixel point in the third sub-area in the synthesized image.
8. The apparatus of claim 7, wherein the synthesis module is further configured to determine a third subregion in the short frame image and a subregion in the short frame image corresponding to the third subregion position in the long frame image as a fourth subregion; determining a region of the short frame image except the fourth sub-region and the expanded region as a fifth sub-region; determining a third average brightness value of pixel points in each fifth sub-region, and determining the frame number of the short frame image to be superimposed according to the preset target brightness range and the third average brightness value; and acquiring short frame images to be superposed of the frame number, and superposing the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in each short frame image to be superposed to obtain the brightness values of the pixel points corresponding to the pixel point positions in the fifth sub-area in the synthesized image.
9. An electronic device is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor and the communication interface are used for realizing mutual communication by the memory through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of any one of claims 1 to 4 when executing a program stored in the memory.
10. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of claims 1-4.
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