CN111147760A - Light field camera, luminosity adjusting method and device thereof and electronic equipment - Google Patents
Light field camera, luminosity adjusting method and device thereof and electronic equipment Download PDFInfo
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- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
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- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/76—Circuitry for compensating brightness variation in the scene by influencing the image signals
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- H—ELECTRICITY
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Abstract
The invention discloses a light field camera, a luminosity adjusting method and device thereof and electronic equipment, wherein the method comprises the following steps: acquiring a light field image passing through a micro microscope array; calculating the gray value of the light field image according to the light field image; calculating the gray value of the light field image according to a preset median value and a preset compensation value to obtain a light intensity adjustment value; and adjusting the intensity of the light field image according to the light intensity adjustment value to obtain an adjusted light field image. According to the luminosity adjusting method of the light field camera provided by the embodiment of the invention, the gray value of the light field image is calculated according to the preset median value and the preset compensation value to obtain the light intensity adjusting value, and the light field image is adjusted according to the light intensity adjusting value, so that the problem of facula caused by space light to imaging can be improved, meanwhile, the intensity of any light can be locally adjusted, and the locally generated light intensity drop is improved.
Description
Technical Field
The invention relates to the technical field of light field cameras, in particular to a light field camera, a luminosity adjusting method and device thereof and electronic equipment.
Background
The light field camera based on the micro microscope array applies a light field imaging technology, can record two-dimensional position information and two-dimensional direction information of a space target through single exposure, and is a mainstream light field acquisition device at present. The difference between the light field camera and the common camera is that the light field camera is provided with a micro lens array on an imaging surface between a main lens and a detector, the array divides the pupil of the main lens into a plurality of sub apertures, and each micro lens acquires light rays from the same position and different directions in a target scene through each sub aperture, so that the acquisition of four-dimensional light field data is realized. Compared with the traditional imaging equipment, the light field camera can additionally provide the direction information of light radiation, simultaneously enlarges the clear aperture and the depth of field range, improves the stability of the system, and has important application in the fields of three-dimensional scene reconstruction, real-time monitoring, target identification, high-temperature measurement and the like.
However, the existing light field camera is difficult to realize the function of light convergence on imaging because the imaging of the micro microscope array is independent and the microstructure process of each lens in the array cannot be controlled. Therefore, when the light field camera collects images of an area to be measured with strong light or light intensity having a large contrast, the images of the light field camera form spots that cannot be suppressed.
Disclosure of Invention
In view of this, embodiments of the present invention provide an optical field camera, a luminosity adjustment method and apparatus thereof, and an electronic device, so as to solve a technical problem that when an existing optical field camera collects strong light or light intensity in a relatively large region to be detected, an image formed by the optical field camera forms an unbounded light spot.
The technical scheme provided by the invention is as follows:
the first aspect of the embodiments of the present invention provides a luminosity adjustment method for a light field camera, where the luminosity adjustment method includes the following steps: acquiring a light field image passing through a micro microscope array; calculating the gray value of the light field image according to the light field image; calculating the gray value of the light field image according to a preset median value and a preset compensation value to obtain a light intensity adjustment value; and adjusting the intensity of the light field image according to the light intensity adjustment value to obtain an adjusted light field image.
Optionally, calculating a gray value of the light field image according to the light field image includes: calculating to obtain red, green and blue tristimulus values of the light field image according to the light field image; and calculating the red, green and blue tristimulus values according to any one of a maximum value method, a floating point algorithm, an integer method, a shifting method or an average value method to obtain the gray value of the light field image.
Optionally, calculating a gray value of the light field image according to a preset median value and a preset compensation value to obtain a light intensity adjustment value, including: judging the gray value of the light field image according to a preset median; and when the gray value of the light field image is smaller than the preset median, calculating to obtain a light intensity adjustment value according to the sum of the gray value of the light field image and the preset compensation value.
Optionally, calculating a gray value of the light field image according to a preset median value and a preset compensation value to obtain a light intensity adjustment value, further comprising: and when the gray value of the light field image is greater than the preset median value, calculating to obtain a light intensity adjustment value according to the difference between the gray value of the light field image and the preset compensation value.
Optionally, the luminosity adjustment method of the light field camera further includes: and outputting the adjusted light field image.
A second aspect of an embodiment of the present invention provides a luminosity adjustment apparatus for a light field camera, including: an image acquisition module for acquiring a light field image through the micro microscope array; the gray value calculation module is used for calculating the gray value of the light field image according to the light field image; the adjusting value calculating module is used for calculating the gray value of the light field image according to a preset median value and a preset compensation value to obtain a light intensity adjusting value; and the adjusting module is used for adjusting the light field image according to the light intensity adjusting value to obtain an adjusted light field image.
A third aspect of embodiments of the present invention provides a light field camera, including: the optical system comprises a lens, a micro microscope array and a gray scale processing unit, wherein the gray scale processing unit adjusts a light field image of the light field camera according to the luminosity adjusting method of the light field camera in the first aspect and the first aspect of the embodiment of the invention.
A fourth aspect of the embodiments of the present invention provides an electronic device, which includes a display unit and the light field camera according to the third aspect of the embodiments of the present invention.
A fifth aspect of the embodiments of the present invention provides a computer-readable storage medium, which stores computer instructions for causing a computer to execute the luminosity adjustment method for a light field camera according to any one of the first aspect and the first aspect of the embodiments of the present invention.
The technical scheme provided by the invention has the following advantages:
according to the light field camera and the luminosity adjusting method, device and electronic equipment thereof provided by the embodiment of the invention, the grey value of the light field image is calculated according to the preset median value and the preset compensation value to obtain the light intensity adjusting value, and the light field image is adjusted according to the light intensity adjusting value, so that the problem of light spots caused by space light on imaging can be improved, meanwhile, the intensity of any light can be locally adjusted, and the locally generated light intensity drop is improved. Therefore, the luminosity adjusting method of the light field camera provided by the embodiment of the invention adjusts the light field image through the light intensity adjusting value, and can solve the technical problem that when the light field camera collects strong light or light intensity to a large area to be detected, the imaging of the light field camera can form spots which cannot be inhibited.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method of photometric adjustment of a light field camera according to an embodiment of the present invention;
FIG. 2 is a flow chart of photometric adjustment of a light field camera according to another embodiment of the present invention;
FIG. 3 is a gray value distribution graph of a method of luminance adjustment of a light field camera according to an embodiment of the present invention;
FIG. 4 is a gray value distribution graph of a method of photometric adjustment of a light field camera according to another embodiment of the present invention;
fig. 5 is a block diagram of the structure of a luminosity adjustment apparatus of a light field camera according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an electronic device according to an embodiment of the invention;
fig. 7 is a schematic hardware configuration diagram of a luminosity adjustment terminal of a light field camera according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
The embodiment of the invention provides a luminosity adjusting method of a light field camera, which comprises the following steps as shown in figure 1:
step S101: acquiring a light field image passing through a micro microscope array; specifically, the light field camera works on the principle that light rays are recorded by adding a micro microscope array or a micro lens array at the focal length of a main lens, and the light rays recorded by the light field camera comprise information such as the intensity, the position and the direction of the light rays. Therefore, when adjusting the luminosity of the imaging image of the light field camera, a light field image through the micro microscope array may be acquired first.
Step S102: and calculating the gray value of the light field image according to the light field image.
Specifically, since the light field image obtained through the micro microscope array is generally a color image, each pixel in the color image is composed of three basic pigments of R (red), G (green), and B (blue), and the value of R, G, B is between [0, 255 ]. Therefore, the red, green and blue tristimulus values of the light field image can be calculated according to the light field image; specifically, the tristimulus values of the RGB color can be read by an existing RGB color reading device or the like, or can be calculated by an existing color extraction method or the like.
After the tristimulus values of the light field image are obtained through calculation, the red, green and blue tristimulus values can be calculated through any one of a maximum value method, a floating point algorithm, an integer method, a shift method or an average value method, and the gray value of the light field image is obtained.
The maximum value method is to extract R, G, B the maximum value of the three values as the Gray value, i.e. the Gray value may be expressed as Gray ═ max { R, G, B }, the average value method is to extract R, G, B the average value as the Gray value, i.e. Gray ═ R + G + B)/3, the floating point algorithm is to calculate the Gray value by using the formula Gray ═ R ＊ 0.3+ G ＊ 0.59+ B ＊ 0.11, the integer method is to calculate the Gray value by using the formula Gray ═ R ＊ 30+ G ＊ 59+ B ＊ 11)/100, the shift method is to calculate the Gray value by using the formula Gray ═ R ＊ 77+ G ＊ 151+ B ＊ 28) > 8, and the Gray value of the light field image may be obtained by performing graying on the image by using the weighted average method, the component method, etc.
Step S103: calculating the gray value of the light field image according to a preset median value and a preset compensation value to obtain a light intensity adjustment value; specifically, a median value and a compensation value may be preset according to actual needs, the preset median value and the gray value are compared, and the preset compensation value is adopted to compensate the comparison result to obtain a light intensity adjustment value.
Step S104: and adjusting the intensity of the light field image according to the light intensity adjustment value to obtain an adjusted light field image. Specifically, since the obtained light field image of the light field camera includes information such as intensity, position, direction, and the like, when the light intensity is adjusted, the intensity information of the light rays in the light field image can be extracted, the intensity of the light field image is adjusted according to the calculated light intensity adjustment value, and specifically, the light intensity adjustment value can be added to the intensity of the original light field image, so that the adjusted light field image is obtained.
According to the luminosity adjusting method of the light field camera provided by the embodiment of the invention, the gray value of the light field image is calculated according to the preset median value and the preset compensation value to obtain the light intensity adjusting value, and the light field image is adjusted according to the light intensity adjusting value, so that the problem of facula caused by space light to imaging can be improved, meanwhile, the intensity of any light can be locally adjusted, and the locally generated light intensity drop is improved. Therefore, the luminosity adjusting method of the light field camera provided by the embodiment of the invention adjusts the light field image through the light intensity adjusting value, and can solve the technical problem that when the light field camera collects strong light or light intensity to a large area to be detected, the imaging of the light field camera can form spots which cannot be inhibited.
As an optional implementation manner of the embodiment of the present invention, as shown in fig. 2, the step S103 calculates the gray-level value of the light field image according to the preset median value and the preset compensation value to obtain the light intensity adjustment value, and includes the following steps:
step S201: judging the gray value of the light field image according to a preset median value; specifically, a grayscale image is an image in which each pixel has only one sample color. Such images are typically displayed in gray scale from the darkest black to the brightest white. During calculation, the white and the black can be divided into a plurality of levels according to a logarithmic relationship, the range is generally from 0 to 255, the white is 255, and the black is 0, therefore, the preset median value can be the median 128 of the gray values of 0 to 255, and meanwhile, other values can be selected as the preset median value according to actual needs, which is not limited by the invention.
Step S202: and when the gray value of the light field image is smaller than the preset median, calculating to obtain a light intensity adjustment value according to the sum of the gray value of the light field image and the preset compensation value. The preset compensation value may also be set as needed, and the same value as the preset median value may be selected, or other values may also be selected, for example, 120 may be selected as the compensation value. Specifically, the gray scale value of the light field image can be calculated according to step S102, and since the light field camera includes the micro microscope array, the light spot information of each lens in the array can be acquired after the image information collected by the lens passes through the micro microscope array, and after calculation, the gray scale value corresponding to each light spot information can be obtained, that is, a plurality of gray scale values in the light field image can be obtained. For example, if the calculated gray value includes 60 and the gray value is smaller than the preset median 128, the gray value 60 may be added to the preset compensation value 120 to obtain the light intensity adjustment value 180.
Step S203: and when the gray value of the light field image is greater than the preset median value, calculating to obtain a light intensity adjustment value according to the difference between the gray value of the light field image and the preset compensation value. Specifically, according to step S102, a plurality of gray-scale values of the light-field image may be calculated, for example, the calculated gray-scale value is 150, which is greater than the preset median 128, so that the gray-scale value 150 may be subtracted from the preset compensation value 120 to obtain the light intensity adjustment value 30. After the light intensity adjustment value is calculated, the intensity of the light field image may be adjusted according to the adjustment value.
Specifically, as shown in fig. 3, the gray value distribution diagram of the light field image after calculating the gray value of the light field image according to the light field image is shown, wherein darker colors indicate smaller gray values, and lighter colors indicate larger gray values. When spatial light passes through the lens and images are mapped onto such a microscope array, some image portions are dark and some image portions are bright, and if such a light field image is imaged directly onto the image sensor, spots that cannot be suppressed are formed. After the luminosity adjustment method of the light field camera provided by the embodiment of the invention is used for adjustment, the distribution condition of the gray value of the image is shown in fig. 4, and it can be seen that the gray value of the image is relatively uniform after adjustment. When the light is changed sharply, a clear and smooth image picture can be obtained.
Optionally, the luminosity adjustment method of the light field camera further includes: and outputting the adjusted light field image. In particular, after obtaining the adjusted light field image, the light field image may be output to a display unit, which may be an LCD display screen or an LED display screen, or the like.
An embodiment of the present invention further provides a luminosity adjustment apparatus for a light field camera, as shown in fig. 5, the luminosity adjustment apparatus includes:
the image acquisition module 1 is used for acquiring a light field image passing through the micro microscope array; for details, refer to the related description of step S101 in the above method embodiment.
The gray value calculating module 2 is used for calculating the gray value of the light field image according to the light field image; for details, refer to the related description of step S102 in the above method embodiment.
The adjustment value calculating module 3 is used for calculating the gray value of the light field image according to a preset median value and a preset compensation value to obtain a light intensity adjustment value; for details, refer to the related description of step S103 in the above method embodiment.
And the adjusting module 4 is used for adjusting the light field image according to the light intensity adjusting value to obtain an adjusted light field image. For details, refer to the related description of step S104 in the above method embodiment.
The luminosity adjusting device of the light field camera provided by the embodiment of the invention can improve the problem of facula caused by space light to imaging by calculating the gray value of the light field image, calculating the gray value of the light field image according to the preset median value and the preset compensation value to obtain the light intensity adjusting value, and adjusting the light field image according to the light intensity adjusting value, and can also locally adjust the intensity of any light, thereby improving the locally generated light intensity drop. Therefore, the luminosity adjusting device of the light field camera provided by the embodiment of the invention adjusts the light field image through the light intensity adjusting value, and can solve the technical problem that when the light field camera collects strong light or light intensity to a large area to be detected, the imaging of the light field camera can form spots which cannot be inhibited.
An embodiment of the present invention further provides a light field camera, as shown in fig. 6, the light field camera includes: a lens 10, a micro-microscope array 20 and a gray scale processing unit 30, wherein the gray scale processing unit 30 adjusts the light field image of the light field camera according to the luminosity adjustment method of the light field camera in the above embodiment.
According to the light field camera provided by the embodiment of the invention, the light intensity in the light field image can be adjusted by adding the gray processing unit in the camera, so that the technical problem that the imaging of the light field camera can form spots which cannot be inhibited is solved.
An embodiment of the present invention further provides an electronic device, as shown in fig. 6, the electronic device includes a display unit 40 and the light field camera described in the above embodiment. Specifically, the image adjusted by the gradation processing unit in the light field camera can be displayed on the display unit. The display unit 40 may be an LCD display or an LED display, or other devices with display function, which is not limited in the present invention.
An embodiment of the present invention further provides a luminosity adjustment terminal of a light field camera, as shown in fig. 7, the luminosity adjustment terminal of the light field camera may include a processor 51 and a memory 52, where the processor 51 and the memory 52 may be connected by a bus or in another manner, and fig. 7 takes the connection by the bus as an example.
The processor 51 may be a Central Processing Unit (CPU). The Processor 51 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 52 is a non-transitory computer readable storage medium, and can be used for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the luminosity adjustment apparatus of the light field camera in the embodiment of the present invention. The processor 51 executes various functional applications and data processing of the processor by running non-transitory software programs, instructions and modules stored in the memory 52, that is, implements the luminosity adjustment method of the light field camera in the above-described method embodiment.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 51, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, and these remote memories may be connected to the processor 51 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.
The one or more modules are stored in the memory 52 and, when executed by the processor 51, perform a method of photometric adjustment of a light field camera as in the embodiment shown in fig. 1-2.
The details of the luminosity adjustment terminal of the light field camera may be understood by referring to the corresponding related descriptions and effects in the embodiments shown in fig. 1 to fig. 2, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (9)
1. A luminosity adjusting method of a light field camera is characterized by comprising the following steps:
acquiring a light field image passing through a micro microscope array;
calculating the gray value of the light field image according to the light field image;
calculating the gray value of the light field image according to a preset median value and a preset compensation value to obtain a light intensity adjustment value;
and adjusting the intensity of the light field image according to the light intensity adjustment value to obtain an adjusted light field image.
2. The photometric adjustment method for a light field camera according to claim 1 wherein the calculating a gray value for the light field image from the light field image comprises:
calculating to obtain red, green and blue tristimulus values of the light field image according to the light field image;
and calculating the red, green and blue tristimulus values according to any one of a maximum value method, a floating point algorithm, an integer method, a shifting method or an average value method to obtain the gray value of the light field image.
3. The luminosity adjustment method of a light field camera according to claim 1, wherein calculating the gray value of the light field image according to a preset median value and a preset compensation value to obtain a light intensity adjustment value comprises:
judging the gray value of the light field image according to a preset median;
and when the gray value of the light field image is smaller than the preset median, calculating to obtain a light intensity adjustment value according to the sum of the gray value of the light field image and the preset compensation value.
4. The luminosity adjustment method of a light field camera according to claim 3, wherein the gray value of the light field image is calculated according to a preset median value and a preset compensation value to obtain a light intensity adjustment value, further comprising:
and when the gray value of the light field image is greater than the preset median value, calculating to obtain a light intensity adjustment value according to the difference between the gray value of the light field image and the preset compensation value.
5. The photometric adjustment method of a light field camera according to claim 1 further comprising:
and outputting the adjusted light field image.
6. A luminosity adjustment apparatus of a light field camera, comprising:
an image acquisition module for acquiring a light field image through the micro microscope array;
the gray value calculation module is used for calculating the gray value of the light field image according to the light field image;
the adjusting value calculating module is used for calculating the gray value of the light field image according to a preset median value and a preset compensation value to obtain a light intensity adjusting value;
and the adjusting module is used for adjusting the light field image according to the light intensity adjusting value to obtain an adjusted light field image.
7. A light field camera, comprising: a lens, a micro microscope array and a gray scale processing unit, the gray scale processing unit adjusts the light field image of the light field camera according to the luminosity adjustment method of the light field camera of any one of claims 1 to 5.
8. An electronic device comprising a display unit and the light field camera of claim 7.
9. A computer-readable storage medium storing computer instructions for causing a computer to execute a photometric adjustment method of a light field camera according to any one of claims 1 to 5.
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