Lens zooming and light compensation control method based on filter adaptation and related equipment

Abstract

The application provides a lens zoom light compensation control method based on filter adaptation and related equipment, and the method comprises the following steps: obtaining a zoom instruction of a camera and analyzing to obtain a current field of view angle; determining a light compensation mode according to the field of view angle, calculating a first current value, a second current value of a main light group and a third current value of a spotlight; and driving three LED lamps to output light compensation according to the current values. The application links the camera zoom state with the light compensation system, automatically switches the light compensation mode according to different field of view angles and optimizes the power distribution of each LED lamp, solves the problems of insufficient edge illumination in the wide-angle mode and central brightness attenuation in the long-focus mode of the traditional fixed light compensation scheme, realizes uniform light compensation in the whole focus section, and improves the imaging quality in different shooting scenes.

Description

Technical Field

[0001] This invention relates to the field of equipment control technology, and in particular to a lens zoom lighting control method and related equipment based on filter adaptation. Background Technology

[0002] With the development of mobile phone photography technology, multi-camera systems have become a standard feature of smartphones, allowing users to switch between wide-angle, medium-range, and telephoto lenses using zoom to achieve different shooting effects. However, existing mobile phone lighting systems typically use a fixed flash configuration and cannot dynamically adjust the lighting mode according to the camera's zoom status.

[0003] In practical use, when users switch to telephoto mode to shoot distant targets, traditional wide-angle fill lights suffer from excessive divergence, resulting in severe attenuation of center illumination and insufficient fill light intensity for telephoto shooting. Conversely, when switching to wide-angle mode, fill lights with a focused design cause insufficient fill light at the edges of the field of view, leading to uneven brightness in the image. Existing fill light systems cannot adaptively adjust fill light parameters according to the camera's zoom status, resulting in unsatisfactory fill light effects at different focal lengths. Summary of the Invention

[0004] The main objective of this invention is to solve the technical problem that existing mobile phone fill light systems cannot adaptively adjust fill light parameters according to the zoom state of the camera, resulting in unsatisfactory fill light effects at different focal lengths; This invention provides a lens zoom illumination control method based on filter adaptation, the adaptive control method comprising: Obtain the zoom command from the camera, parse the zoom command, and obtain the current field of view; The fill light mode is determined based on the current field of view, and the current parameters of the three LEDs on the mobile phone are calculated based on the fill light mode to obtain the first current value, the second current value of the main light group and the third current value of the spotlight. The three LEDs are driven and controlled according to the first current value, the second current value and the third current value, and the corresponding supplementary light output is obtained by cooperating with filters and lenses with different optical characteristics.

[0005] The present invention also provides a lens zoom illumination control device based on filter adaptation, the lens zoom illumination control device based on filter adaptation includes: The instruction parsing module is used to obtain the zoom instruction from the camera, parse the zoom instruction, and obtain the current field of view. The current calculation module is used to determine the supplementary lighting mode based on the current field of view, and to calculate the current parameters of the three LED lights on the mobile phone based on the supplementary lighting mode, so as to obtain the first current value, the second current value of the main light group and the third current value of the spotlight. The drive control module is used to drive and control the three LEDs according to the first current value, the second current value and the third current value, and obtain the corresponding supplementary light output by cooperating with filters and lenses with different optical characteristics.

[0006] The present invention also provides a lens zoom lighting control device based on filter adaptation, comprising: a memory and at least one processor, wherein the memory stores instructions, and the memory and the at least one processor are interconnected by a circuit; the at least one processor calls the instructions in the memory to cause the lens zoom lighting control device based on filter adaptation to perform the steps of the above-described lens zoom lighting control method based on filter adaptation.

[0007] The present invention also provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the steps of the above-described lens zoom illumination control method based on filter adaptation.

[0008] The aforementioned lens zoom illumination control method and related equipment based on filter adaptation obtain the zoom command from the camera and parse it to obtain the current field of view; determine the illumination mode based on the field of view, calculate the first current value and second current value of the main light group and the third current value of the spotlight; and drive the three LEDs to output illumination based on the current values. This invention links the camera zoom state with the illumination system, automatically switches the illumination mode according to different field of view, and optimizes the power distribution of each LED. This solves the problems of insufficient edge illumination in wide-angle mode and center brightness attenuation in telephoto mode in traditional fixed illumination solutions, achieving uniform illumination across the entire focal length and improving image quality in different shooting scenarios.

[0009] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0010] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the first embodiment of the lens zoom fill light control method based on filter adaptation in this invention. Figure 2 This is a schematic diagram of the second embodiment of the lens zoom fill light control method based on filter adaptation in this invention. Figure 3 This is a schematic diagram of one embodiment of the lens zoom supplementary lighting control device based on filter adaptation in this invention. Figure 4 This is a schematic diagram of an embodiment of a lens zoom supplementary lighting control device based on filter adaptation in this invention. Figure 5 This is a schematic diagram of a first layout of three LED lights in an embodiment of the present invention; Figure 6 This is a schematic diagram of a second layout of three LED lights in an embodiment of the present invention. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] The terms "comprising" and "having," and any variations thereof, used in the embodiments of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include other steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0014] To facilitate understanding of this embodiment, a lens zoom illumination control method based on filter adaptation, as disclosed in this embodiment of the invention, will first be described in detail. For example... Figure 1 As shown, this method includes the following steps: 101. Obtain the zoom command from the camera, parse the zoom command, and obtain the current field of view; In this embodiment, obtaining the zoom command from the camera and parsing the zoom command to obtain the current field of view includes: extracting the current focal length value from the zoom command; obtaining the sensor size parameters of the camera; calculating the sensor diagonal length based on the sensor size parameters; and calculating the current field of view using an arctangent function based on the current focal length value and the sensor diagonal length.

[0015] Specifically, when a user triggers a zoom operation, the camera module generates a zoom command containing focal length information. This command can be triggered by the user swiping the screen, tapping a preset zoom level button, or using a two-finger zoom gesture. After receiving these operations, the system encapsulates the current lens focal length value in the zoom command. For example, when the user switches from 1x zoom to 2x zoom, the focal length value carried in the zoom command will switch from the equivalent focal length of the main camera (e.g., 26mm) to the equivalent focal length of the telephoto lens (e.g., 52mm).

[0016] After extracting the focal length value from the zoom command, the field of view needs to be calculated in conjunction with the camera's sensor size. Different mobile phone models have different image sensor sizes, such as 1 / 1.56 inch or 1 / 2.3 inch, and this size information is usually stored in the system configuration file. After obtaining the long and short side dimensions of the sensor, the sensor diagonal length can be calculated. In practical applications, the sensor diagonal length is calculated using the Pythagorean theorem, that is, the diagonal length is equal to the square root of the sum of the squares of the long and short sides.

[0017] After obtaining the current focal length *f* and the sensor diagonal length *d*, the field of view (FOV) is calculated based on optical imaging principles. Since there is an arctangent relationship between the FOV, focal length, and sensor size, the FOV can be obtained using the arctangent function. During the calculation, unit conversion is crucial; focal length is typically expressed in millimeters, while sensor size may be expressed in micrometers or millimeters. Units must be standardized before calculation. Furthermore, the final FOV is a radian value, which will be converted to an angle value for threshold comparison when determining the supplementary lighting mode.

[0018] It should be noted that some mobile phones have multiple camera switching capabilities. When the focal length changes, causing a physical lens switch, the corresponding sensor size parameters will also be updated. Therefore, when parsing zoom commands, in addition to extracting the focal length value, it is also necessary to simultaneously obtain the identifier of the currently enabled camera in order to call the correct sensor parameters for field of view calculation.

[0019] 102. Determine the supplementary lighting mode based on the current field of view, and calculate the current parameters of the three LEDs on the mobile phone based on the supplementary lighting mode to obtain the first current value, the second current value of the main light group and the third current value of the spotlight. In this embodiment, determining the fill light mode based on the current field of view includes: comparing the current field of view with a preset first threshold and a second threshold; when the current field of view is greater than the first threshold, it is determined to be a wide-angle fill light mode; when the current field of view is less than or equal to the second threshold, it is determined to be a telephoto fill light mode; when the current field of view is greater than the second threshold and less than or equal to the first threshold, it is determined to be a mid-range hybrid fill light mode.

[0020] Specifically, after obtaining the current field of view (FOV), the system immediately enters the supplementary lighting mode determination process. The determination process adopts a dual threshold comparison mechanism, with the first and second thresholds set based on the actual optical parameters of the mobile phone camera and the supplementary lighting requirements. In a specific embodiment, the first threshold can be set to 85 degrees, and the second threshold can be set to 35 degrees. Such threshold configuration can effectively distinguish between wide-angle, mid-range, and telephoto shooting scenarios.

[0021] When the field of view (FOV) is greater than 85 degrees, it indicates that the user is using an ultra-wide-angle or wide-angle lens for shooting. In this case, the shooting scene is larger, and the area requiring illumination also increases accordingly. The system will then determine this as wide-angle fill light mode. In this mode, the main light group's two LEDs provide fill light primarily. These two LEDs have a large divergence angle, capable of covering the entire wide-angle field of view. The spotlight compensation lamp, due to its narrow beam angle, can cause center overexposure and edge underexposure in wide-angle scenes, and therefore is not enabled in this mode.

[0022] If the field of view (FOV) is less than or equal to 35 degrees, it indicates that the camera is in telephoto mode, and the subject is usually at a distance. Traditional wide-angle fill lights are ineffective in this scenario because the light diverges, causing the illumination to significantly decrease by the time it reaches the distant target. In this case, the system determines it to be in telephoto fill light mode, which disables the main light assembly and activates only the spotlight compensation light. The spotlight compensation light uses a narrow beam design with high beam concentration, focusing light energy onto a smaller area to ensure sufficient illumination for distant targets.

[0023] For shots with a field of view (FOV) between 35 and 85 degrees, the system will determine it to be a mid-range hybrid fill light mode. This focal length range covers most everyday shooting scenarios; it doesn't offer the wide field of view of a wide-angle lens, nor does it focus on a single distant target like a telephoto lens. In mid-range shooting scenarios, relying solely on the main light group or spotlight cannot achieve ideal results. Therefore, this mode employs a hybrid strategy: the main light group operates at medium power to provide basic illumination, while the spotlight compensation lamp is activated at lower power to enhance the brightness of the central area of ​​the image. This combination ensures uniform illumination throughout the image while avoiding overexposure in the center.

[0024] After determining the fill light mode, the system will invoke the corresponding current calculation method based on the different modes. Each mode corresponds to a different current distribution strategy. For example, in wide-angle mode, the main lights may each operate at 300mA, while in mid-focus hybrid mode, the main lights may drop to 200mA, and the spotlights will dynamically adjust within the range of 200-800mA depending on the actual distance. The calculation process for these current values ​​will be explained in detail in subsequent steps.

[0025] 103. Drive and control the three LEDs according to the first current value, the second current value and the third current value, and obtain the corresponding supplementary light output by using filters and lenses with different optical characteristics.

[0026] In this embodiment, the step of driving and controlling the three LEDs according to the first, second, and third current values, and obtaining the corresponding supplementary light output through the cooperation of filters and lenses with different optical characteristics, includes: calculating the duty cycle of the pulse width modulation signal according to the first, second, and third current values ​​to obtain the first duty cycle corresponding to the first main lamp, the second duty cycle corresponding to the second main lamp, and the third duty cycle corresponding to the spotlight compensation lamp; inputting the first, second, and third duty cycles to three independent LED driving channels respectively, modulating and controlling the output current of each driving channel to obtain the actual driving current of the three LEDs; and synchronously triggering the three LEDs according to the actual driving current to obtain the superimposed light intensity output of the three LEDs as the supplementary light output.

[0027] Specifically, the calculated three current values ​​need to be converted into control signals that the LED driver chip can recognize. In this embodiment, pulse width modulation (PWM) is used to control the LED brightness, which has higher efficiency and better linearity compared to analog dimming. The brightness of each LED is proportional to the drive current, which in turn is directly related to the duty cycle of the PWM signal. When calculating the duty cycle, the forward voltage drop of the LED and the power supply voltage of the driver circuit need to be considered. By mapping the duty cycle to the target current value, the corresponding PWM parameters can be obtained.

[0028] The phone's motherboard integrates three independent LED driver circuits, corresponding to the first main LED, the second main LED, and the spotlight compensation LED. The design parameters of these three driver circuits may differ; for example, the maximum current design of the main LED driver circuit is 350mA, while the spotlight driver circuit, considering higher power requirements, can reach a maximum current of 800mA. Before writing the duty cycle parameters into the driver chip, the system checks whether the current value of each circuit exceeds the hardware limit. If it does, it performs limiting processing to prevent overcurrent damage to the LEDs or driver circuits.

[0029] After receiving the duty cycle parameter, the drive channel outputs a corresponding square wave signal according to the preset PWM frequency. The selection of the PWM frequency requires a trade-off between switching losses and current ripple; too low a frequency may cause visible flickering in the LED, while too high a frequency will increase switching losses. In actual products, the PWM frequency is typically set between several kilohertz and tens of kilohertz. The drive circuit controls the on-time of the power transistor based on the PWM signal, thereby adjusting the average current flowing through the LED and achieving brightness adjustment.

[0030] It is important to note that the triggering sequence of the three LEDs needs to be strictly synchronized. At the moment of taking the picture, all three LEDs must light up simultaneously; otherwise, it will cause differences in exposure time in different areas of the image. To achieve synchronized triggering, the system sends a global enable signal along with the PWM signal. This enable signal acts on all three drive circuits simultaneously, ensuring that the three LEDs start illuminating at the same moment. The delay time from pressing the shutter to the LEDs lighting up is controlled within a few milliseconds; this delay mainly comes from the response time of the drive circuits and the LEDs' own on-time.

[0031] After the LEDs are lit, the three beams of light will overlap on the target plane. The two LEDs in the main light group produce larger and overlapping light spots, while the spotlight's light spot is smaller but has high intensity at the center. The superposition effect of these three beams depends on the spatial position and beam angle of each LED. In the aforementioned triangular layout design, the spotlight is located in the center and aligned with the telephoto lens. This layout provides optimal illumination in telephoto mode, while in wide-angle and mid-range telephoto modes, the symmetrical distribution of the main light groups ensures that the illumination on both sides of the image is basically consistent. The final superimposed fill light output will be captured synchronously with the camera exposure.

[0032] In this embodiment, the zoom command from the camera is obtained and the current field of view is parsed; the supplementary lighting mode is determined based on the field of view, and the first current value, the second current value of the main light group, and the third current value of the spotlight are calculated; the three LEDs are driven to output supplementary lighting based on the current values. This invention links the camera's zoom state with the supplementary lighting system, automatically switching the supplementary lighting mode according to different field of view and optimizing the power distribution of each LED. This solves the problems of insufficient edge illumination in wide-angle mode and center brightness attenuation in telephoto mode in traditional fixed supplementary lighting solutions, achieving uniform supplementary lighting across the entire focal length and improving image quality in different shooting scenarios.

[0033] Please see Figure 2 Another embodiment of the lens zoom fill light control method based on filter adaptation in this application includes: 201. Obtain the zoom command from the camera, parse the zoom command, and obtain the current field of view; In this embodiment, step 201 is similar to step 101, and will not be described again here.

[0034] 202. Determine the supplementary lighting mode based on the current field of view; In this embodiment, determining the supplementary lighting mode based on the current field of view includes: comparing the current field of view with a preset first threshold and a second threshold to obtain the range position of the field of view; classifying and determining the supplementary lighting mode type based on the range position of the field of view: when the field of view is greater than the first threshold, it is determined to be a wide-angle supplementary lighting mode; when the field of view is less than or equal to the second threshold, it is determined to be a telephoto supplementary lighting mode; when the field of view is greater than the second threshold and less than or equal to the first threshold, it is determined to be a mid-telephoto hybrid supplementary lighting mode; and selecting a current allocation strategy based on the determined supplementary lighting mode type to obtain a corresponding current calculation method.

[0035] Specifically, after completing the field of view (FOV) resolution, the system compares the obtained FOV value with two thresholds stored in the configuration table. These two thresholds have been tested and verified in numerous real-world shooting scenarios, effectively defining different ranges of supplementary lighting needs. The comparison process uses a simple numerical judgment logic: first, it checks if the FOV exceeds the first threshold; if it does, it is directly classified as wide-angle mode without further comparison. If the FOV is less than or equal to the first threshold, it is then compared with the second threshold to determine whether it is a telephoto mode or a hybrid mid-telephoto mode.

[0036] Due to differences in camera hardware configurations, the specific values ​​of the first and second thresholds may vary across different phone models. Some models equipped with ultra-wide-angle lenses may have a higher first threshold to more accurately identify ultra-wide-angle scenes. For models with strong telephoto capabilities, the second threshold setting will take into account the actual field of view of the telephoto lens. These threshold parameters are typically calibrated and written into the system before the phone leaves the factory, and can also be optimized through subsequent software updates.

[0037] The mode determination directly impacts the subsequent current allocation strategy. In wide-angle mode, due to the larger area to be illuminated, the main light group needs to operate at higher power. The current calculation method used in this mode focuses on power balance among the main light groups to ensure symmetrical illumination on both sides of the image. The current calculation method for telephoto mode is completely different. This method dynamically adjusts the spotlight's drive current based on the target distance information fed back by the ranging module; the greater the distance, the greater the current, to compensate for energy attenuation during light propagation.

[0038] The current calculation in the hybrid mid-focus mode is the most complex, requiring simultaneous consideration of the coordinated operation of the main light group and the spotlight. In this mode, the current calculation method not only needs to determine the basic current value of each LED, but also needs to be fine-tuned according to the characteristics of the actual scene. For example, when the subject is detected to be in the center of the frame, the current ratio of the spotlight can be appropriately increased; while when the subjects are more dispersed, the current of the main light group is increased to improve the overall brightness. This adaptive current distribution mechanism can achieve good fill light effects in different shooting scenarios.

[0039] In addition to the three basic modes mentioned above, the system also includes a transitional handling mechanism for mode switching. When the FOV value fluctuates frequently around a threshold, triggering a mode switch with each fluctuation could lead to noticeable abrupt changes in the lighting effect. To avoid this, a delayed comparison mechanism has been added to the decision logic; the lighting mode will only be switched when the FOV remains stable within a certain range for several consecutive frames. This design improves the stability of the lighting system in actual use.

[0040] 203. Obtain the corresponding target illumination area according to the supplementary lighting mode type, calculate the size and distance parameters of the target illumination area, and obtain the coverage range of the target illumination area; In this embodiment, different lighting modes correspond to different target illumination areas. In wide-angle lighting mode, the target illumination area needs to cover the entire wide-angle field of view; in telephoto lighting mode, the target illumination area is concentrated in a smaller area in the center of the image; and in mid-range hybrid lighting mode, the target illumination area is somewhere in between. The system reads the corresponding illumination area parameters from preset configuration data according to the current lighting mode type.

[0041] Specifically, determining the target illumination area first requires obtaining the distance information of the subject. A mobile phone can calculate the distance using a laser rangefinder or by leveraging the parallax principle of dual cameras. This distance value is a key parameter for subsequently calculating the illumination range. After obtaining the distance data, the system combines it with the current field of view to estimate the actual size of the physical area that needs illumination. For example, when photographing an object one meter away, using a wide-angle lens might require illuminating an area close to one square meter; while switching to a telephoto lens might only require illuminating an area of ​​a few hundred square centimeters.

[0042] The calculation of the area size involves the basic principles of optical imaging. Once the camera's field of view is determined, the range of the scene that the lens can see at a specific distance is fixed. This range can be imagined as a rectangular area, whose width and height are determined by the horizontal and vertical field of view, respectively. The system internally stores the field of view parameters corresponding to different focal lengths. By looking up tables or interpolating, the size of the imaging area in the current state can be quickly obtained. Considering that supplementary lighting needs to have a certain margin to avoid vignetting at the edges of the image, the actual target illumination area will be slightly larger than the imaging area, typically expanding by 10% to 20% on each side.

[0043] The processing of distance parameters requires consideration of multiple factors. The most direct is the distance from the subject to the camera. However, due to the physical offset between the LED's installation position on the phone and the camera lens, the actual distance from the LED to the subject will differ slightly from the measured distance. In this embodiment, the first and second main lights are located on either side of the camera, and although the spotlight compensation light is centrally located, it is not completely aligned with the lens. These offsets, though only a few millimeters, have little impact on long-distance shooting, but cannot be ignored in close-up shooting scenarios. The system calculates the distance from each LED to the target individually based on the known LED installation coordinates.

[0044] After determining the area size and distance parameters, the lighting characteristics of the LEDs themselves also need to be considered. The main LED group is designed with a wide-angle divergence; the light emitted spreads outward in a cone shape, and the illumination range expands rapidly with increasing distance. Conversely, the spotlight compensation lamps use a narrow-angle design, resulting in high beam concentration and a smaller change in illumination range with distance. The system calculates the area that each LED can effectively illuminate at the target distance based on the LED's emission angle parameters. Here, "effective illumination" refers to the area where the illuminance meets the minimum requirement; excessively dark edge areas are not included in the coverage area.

[0045] In wide-angle mode, due to the large beam angles of both main lights, their illumination areas overlap significantly, illuminating almost the entire target area simultaneously. In telephoto mode, only the spotlight is used, resulting in a relatively concentrated coverage area. The mid-range hybrid mode is a special case, with both the main lights and the spotlight operating simultaneously, creating several distinct zones: the central area receives light from all three LEDs, representing a high-illuminance zone; further out, only the main lights cover the area, representing a medium-illuminance zone; and the outermost area may only receive weak illumination from a single main light, representing a low-illuminance zone. The system needs to identify these different zone distributions to prepare for subsequent illuminance optimization calculations.

[0046] 204. Based on the coverage area and the spatial position of the three LEDs, the illuminance distribution of each LED on the target illumination plane is superimposed and calculated, and the total illuminance distribution of the target illumination plane is calculated based on the Lambert optical model. In this embodiment, the three LED lights are respectively a first main light, a second main light, and a spotlight compensation light. The first main light and the second main light constitute the main light group for supplementary lighting in wide-angle and mid-range scenes, and the spotlight compensation light is used for supplementary lighting in telephoto scenes. The first main light, the second main light, and the spotlight compensation light are arranged in a triangle, with the spotlight compensation light located at the center of the triangle and aligned with the optical axis of the telephoto lens of the mobile phone.

[0047] Specifically, in this embodiment, the three LED lights are a first main light, a second main light, and a spotlight compensation light. The first main light and the second main light constitute the main light group for supplementary lighting in wide-angle and mid-range scenes, and the spotlight compensation light is used for supplementary lighting in telephoto scenes.

[0048] Specifically, the three LEDs on the back of the phone can be arranged in different ways to accommodate different camera module designs. For example... Figure 5 In layout 1 shown, the first main light A and the spotlight compensation light B are arranged vertically, with the spotlight compensation light B located at the position corresponding to the telephoto lens and the first main light A located at the position corresponding to the wide-angle lens. This layout is suitable for models with vertically arranged camera modules, where the two main lights are symmetrically distributed on both sides of the spotlight, forming a relatively compact three-point arrangement, suitable for models with limited space in the camera area.

[0049] like Figure 6 Layout 2, as shown, employs a more dispersed triangular arrangement. In this layout, the first main LED A and the second main LED A are located at the two vertices of the triangle, symmetrically distributed, with a spacing of approximately ten millimeters between them. The spotlight compensation LED B is located at the center of the triangle, aligned with the optical axis of the phone's telephoto lens. The advantage of this triangular layout is that the relative positions of the LEDs are more balanced. In the mid-range hybrid mode, when all three LEDs work simultaneously, a more symmetrical illuminance distribution can be produced. The dispersed layout also facilitates heat dissipation, making it suitable for flagship models with high requirements for supplemental lighting performance.

[0050] Regardless of the method Figure 5 still Figure 6The layout of the main lights follows the basic principles of symmetry in the main light group and alignment of the spotlight with the telephoto lens. The symmetrical arrangement of the first and second main lights provides balanced side lighting during wide-angle shooting, avoiding noticeable biases in the image. In some models, the two main lights are located on the top and bottom sides of the camera module, while in others they are distributed horizontally, but symmetry must be maintained. Since the spotlight primarily serves telephoto shooting scenarios, it must be placed as close as possible to the telephoto lens to ensure that its narrow beam accurately illuminates the center area of ​​the viewfinder.

[0051] From a hardware specifications perspective, the three LEDs differ somewhat in physical size and packaging. The main light assembly typically uses standard surface-mount LED packages, with each LED measuring three to five millimeters square and a beam angle exceeding 120 degrees, some even reaching 160 degrees. This large-angle design means that even slight misalignment in installation position has a relatively limited impact on the overall lighting effect. The spotlight, on the other hand, requires higher light output power and may use a slightly larger package, or integrate a hemispherical or conical silicone lens onto the LED chip to focus the beam, converging the light into a narrow angle range of 20 to 30 degrees. Due to the narrow beam angle, the spotlight requires much higher installation precision. If there is a deviation of several degrees between the optical axis and the telephoto lens's optical axis, the center of the spotlight may not be aligned with the center of the image.

[0052] In actual production, the installation positions of the three LEDs require precise alignment calibration. Even if the positions on the design drawings are very accurate, deviations of a few tenths of a millimeter may occur during the actual mounting process. These deviations will have an observable impact on the illuminance distribution when photographed at close range. Therefore, high-end models undergo calibration of the supplementary lighting system before leaving the factory. This is done by measuring the actual LED positions and writing the deviation values ​​into the system configuration file. Subsequent illuminance calculations are then corrected based on these measured data.

[0053] Besides the relative positions of the LEDs, their distance from the camera lens is also crucial. If the LEDs are too close to the lens, lens flare, halo, or ghosting may occur when shooting at close range; if the distance is too far, it will increase the overall thickness of the phone. Typically, there is a gap of more than five millimeters between the LEDs and the nearest lens, and a physical partition is placed between the LEDs and the lens to further reduce stray light interference. Although these structural design details do not directly participate in the illumination calculation, they have a significant impact on the final image quality.

[0054] Furthermore, the step of superimposing and calculating the illuminance distribution of each LED on the target illumination plane based on the coverage area and the spatial position of the three LEDs, and calculating the total illuminance distribution of the target illumination plane based on the Lambertian optical model, includes: setting multiple sampling points on the target illumination plane, calculating the spatial straight-line distance from each sampling point to each LED and the incident angle of light, obtaining the distance parameters and angle parameters corresponding to each LED; calculating the illuminance value of each LED at each sampling point based on the distance parameters and angle parameters of each LED, multiplying the cosine of the incident angle by the LED light intensity and dividing by the square of the distance, to obtain the single-lamp illuminance distribution of each LED at each sampling point; summing the single-lamp illuminance values ​​of the three LEDs at each sampling point to obtain the superimposed illuminance value of each sampling point, and spatially integrating the superimposed illuminance values ​​of all sampling points to obtain the total illuminance distribution of the target illumination plane.

[0055] Specifically, calculating the illuminance distribution requires first setting up sampling points within the target area. These sampling points discretize the continuous illumination plane, facilitating point-by-point calculations. The number and density of sampling points affect calculation accuracy; too few points may miss some local illuminance changes, while too many points will slow down the calculation. In practice, the system dynamically adjusts the sampling points based on the size of the illuminated area; for example, an area of ​​about one square meter might have four to five hundred points, ensuring accuracy without excessive calculation time. The sampling points are arranged in a grid on the plane, each point having a specific coordinate position, with the camera center as the origin of the coordinate system.

[0056] Once the sampling points are established, the distance from each point to the three LEDs needs to be calculated. This distance is the straight-line distance in three-dimensional space, not just the planar projection. Although the LEDs and camera are on the same motherboard, they protrude slightly, resulting in a vertical distance difference between them and the illumination plane. The calculation must take into account all three coordinates of the LED and the sampling point: the squares of the horizontal, vertical, and longitudinal distances are added together and then the square root is taken to obtain the true spatial distance. Since the first main light, the second main light, and the spotlight are installed in different positions, their distances to the same sampling point will definitely be different, especially the sampling points near the edges, which are closer to the main light on the side and farther from the main light on the other side.

[0057] After calculating the distance, we also need to calculate the angle. The angle here refers to the angle between the light ray incident on the sampling point and the plane's normal, also known as the angle of incidence. The illumination plane is generally parallel to the phone screen, and its normal direction is perpendicular to the outside. When the light ray emitted from the LED reaches the sampling point, the direction of this ray forms an angle with the normal direction. When the light ray hits the plane perpendicularly, the angle of incidence is zero degrees, resulting in the highest illuminance; the more oblique the light ray, the larger the angle of incidence, and the lower the illuminance. Calculating the angle of incidence requires knowing the LED position, the sampling point position, and the plane's normal direction. The cosine value of the angle can be obtained through vector operations.

[0058] Once the distance and angle are calculated, the illuminance can be calculated using the Lambertian optical model. The Lambertian model describes the emission characteristics of an ideal diffuse light source. While LEDs don't perfectly match this ideal, it's acceptable as an approximation. The core of the model is that illuminance is directly proportional to luminous intensity and inversely proportional to the square of the distance, while also being multiplied by the cosine of the incident angle. The luminous intensity parameter depends on the type of LED; the luminous intensity curves of the main light and the spotlight are different. The main light has a relatively flat luminous intensity over a large angle range, while the spotlight's luminous intensity is concentrated at a small central angle, dropping sharply beyond the beam angle. The system stores luminous intensity distribution data for different LEDs; during calculations, tables are consulted or polynomial fitting is used to obtain the luminous intensity value at a specific angle.

[0059] By combining the cosine of the incident angle, the LED luminous intensity, and the square of the distance according to the Lambert model, the illuminance produced by a single LED at a given sampling point can be obtained. This calculation needs to be performed for each LED and each combination of sampling points. For example, with 500 sampling points and three LEDs, this would require 1,500 calculations. Fortunately, these calculations are independent and can be processed in parallel to speed up the process. After the calculations are complete, each LED has an illuminance distribution map describing the illuminance it produces across the entire illumination plane when operating alone.

[0060] The next step is to superimpose the illuminance distributions of the three LEDs. The superposition process is straightforward: for each sampling point, simply add the illuminance values ​​generated by the three LEDs at that point. The superposition of light follows the principle of linear superposition, without any complex interference or diffraction effects; it's just a simple algebraic summation. This way, each sampling point will have a total illuminance value, reflecting the actual illuminance at that point when all three LEDs are working simultaneously. Some points may receive light from all three LEDs, resulting in higher illuminance; while some edge positions may only receive light from one or two LEDs, resulting in relatively lower illuminance.

[0061] The illuminance values ​​from all sampling points are aggregated to form a two-dimensional array, where each element corresponds to the total illuminance of a sampling point. This array is essentially a discretized illuminance distribution. To obtain a continuous distribution description, spatial integration is required. This integration involves interpolation and smoothing of the discrete points, extrapolating the illuminance between grid points. Bilinear interpolation or spline interpolation can be used to smoothly transition the illuminance between sampling points. The resulting total illuminance distribution contains not only specific numerical values ​​but also reflects the spatial trend of illuminance variation, such as which areas have high illuminance, which areas have low illuminance, and whether the illuminance gradient is large. This distribution data will serve as the basis for subsequent illuminance uniformity assessments.

[0062] 205. Evaluate the illuminance uniformity based on the total illuminance distribution, and adjust the current parameters of each LED lamp to make the illuminance uniformity reach a preset threshold, thereby obtaining the first current value, the second current value of the main lamp group, and the third current value of the spotlight. In this embodiment, illuminance uniformity is evaluated using the ratio of the minimum value to the average value. From the total illuminance distribution data obtained in the previous step, the illuminance values ​​of all sampling points can be extracted. The minimum and average values ​​are then found, and the ratio gives the uniformity index. This index ranges from zero to one; the closer the value is to one, the more uniform the illuminance distribution, and the closer it is to zero, the greater the difference between light and dark areas. In practical applications, considering the requirements for image quality, the uniformity should be at least 0.7, and ideally, 0.8.

[0063] Specifically, the system first calculates the total illuminance distribution using a set of initial current values, which are usually set directly according to the supplementary lighting mode. For example, in wide-angle mode, each of the two main lights is given 300 mA, and the spotlight is given 0 mA; in telephoto mode, the main light group is given 0 mA, and the spotlight is given 700 mA. The total illuminance distribution calculated using this set of initial currents often does not achieve the ideal uniformity, especially in the mid-range hybrid mode, where it is easy to have problems such as the center being too bright or the edges being too dark when all three LEDs are working simultaneously.

[0064] After obtaining the total illuminance distribution, the system iterates through the illuminance values ​​of all sampling points. During this process, it records the locations of the brightest and darkest points, the average illuminance, and the spatial distribution characteristics of the illuminance. This information can reflect the main problems with the current lighting. For example, if the darkest point appears at the edge of the image, it indicates that the main light power may be insufficient; if the darkest point is near the center but the surrounding area is bright, it indicates that the spotlight power is too low; if the brightest point appears in the exact center and is significantly higher than the surrounding area, it indicates that the spotlight power is too high.

[0065] Based on the characteristics of the illuminance distribution, the system determines which LEDs require current adjustment. The judgment logic is based on illuminance gradients and regional distribution patterns. The system divides the lighting area into three parts: a central area, a middle area, and an edge area, and calculates the average illuminance for each area. The central area is mainly affected by the spotlight, the edge area by the main light group, and the middle area by both. By comparing the illuminance differences among the three areas, the direction and magnitude of current adjustment for each LED can be calculated.

[0066] Current adjustment employs analytical calculations rather than iterative searches. Since illuminance and current are essentially linearly related, a simplified linear model can be established. Assume the current of the main lamp is I1 and I2, and the spotlight current is I3, with corresponding illuminances of E_center, E_mid, and E_edge for the center, middle, and edge zones, respectively. The system internally stores the contribution coefficients of different LEDs to the illuminance of each zone; these coefficients are obtained through simulation or actual measurement during the design phase. Using these coefficients, it is possible to quickly estimate how much current needs to be allocated to the three LEDs to achieve the target illuminance in each zone.

[0067] The calculation process takes into account the symmetry constraint of the main light group. The current of the first and second main lights must be equal to ensure left-right symmetry of the image. Therefore, there are actually only two degrees of freedom: the current of the main light group and the current of the spotlight. The system will generate two equations: one for uniformity constraint (requiring the ratio of minimum illuminance to average illuminance to reach a threshold), and the other for total illuminance constraint (requiring the average illuminance to meet shooting requirements). Solving this system of two equations will yield the values ​​of the main light current and the spotlight current.

[0068] Hardware limitations must be considered during the solution process. Each LED has a maximum current limit: 350 mA for a single main LED and 800 mA for a spotlight. If the calculated current exceeds this limit, it must be throttled to the maximum value, and then the uniformity must be rechecked. Additionally, the total power consumption must not exceed the limit; the weighted sum of the currents of the three LEDs must be controlled within a certain range, otherwise overcurrent protection will be triggered. When multiple constraints exist, the system will process them according to priority: first, ensuring that the hardware limits are not exceeded; second, satisfying the uniformity requirements as much as possible; and finally, considering the total illuminance.

[0069] The calculated current value may not exactly equal the preset threshold for uniformity; it might be slightly higher. This is acceptable; slightly higher uniformity is better than none. If it's found that adjusting the current cannot reach the threshold, the system will provide a compromise, selecting the current combination that maximizes uniformity. While it may not reach the ideal value, it's at least the optimal solution under the current conditions. This situation may occur in extreme scenarios, such as when shooting at extremely close range, where achieving high uniformity is physically difficult.

[0070] Once the current parameters are determined, the system will recalculate the illuminance distribution using the new current values ​​to verify whether the uniformity truly meets the standard. This verification calculation follows the same procedure as before, only the current parameters have changed.

[0071] 206. Drive and control the three LEDs according to the first current value, the second current value and the third current value, and obtain the corresponding supplementary light output by cooperating with filters and lenses with different optical characteristics.

[0072] In this embodiment, step 206 is similar to step 103, and will not be described again here.

[0073] In this embodiment, the zoom command from the camera is obtained and the current field of view is parsed; the supplementary lighting mode is determined based on the field of view, and the first current value, the second current value of the main light group, and the third current value of the spotlight are calculated; the three LEDs are driven to output supplementary lighting based on the current values. This invention links the camera's zoom state with the supplementary lighting system, automatically switching the supplementary lighting mode according to different field of view and optimizing the power distribution of each LED. This solves the problems of insufficient edge illumination in wide-angle mode and center brightness attenuation in telephoto mode in traditional fixed supplementary lighting solutions, achieving uniform supplementary lighting across the entire focal length and improving image quality in different shooting scenarios.

[0074] The above describes the lens zoom illumination control method based on filter adaptation in the embodiments of the present invention. The following describes the lens zoom illumination control device based on filter adaptation in the embodiments of the present invention. Please refer to [link to relevant documentation] for details on this filter adaptation lens zoom illumination control device. Figure 3 One embodiment of the lens zoom fill light control device based on filter adaptation in this invention includes: The instruction parsing module 301 is used to obtain the zoom instruction from the camera, parse the zoom instruction, and obtain the current field of view. The current calculation module 302 is used to determine the supplementary lighting mode based on the current field of view, and to calculate the current parameters of the three LED lights on the mobile phone based on the supplementary lighting mode, so as to obtain the first current value, the second current value of the main light group and the third current value of the spotlight. The drive control module 303 is used to drive and control the three LEDs according to the first current value, the second current value and the third current value, and obtain the corresponding supplementary light output by cooperating with filters and lenses with different optical characteristics.

[0075] In this embodiment of the invention, the lens zoom supplementary lighting control device based on filter adaptation operates the aforementioned lens zoom supplementary lighting control method based on filter adaptation. The device obtains the zoom command from the camera and parses it to obtain the current field of view; determines the supplementary lighting mode based on the field of view; calculates the first current value, the second current value of the main light group, and the third current value of the spotlight; and drives the three LEDs to output supplementary lighting based on the current values. This invention links the camera zoom state with the supplementary lighting system, automatically switching the supplementary lighting mode according to different field of view and optimizing the power distribution of each LED. This solves the problems of insufficient edge illumination in wide-angle mode and center brightness attenuation in telephoto mode in traditional fixed supplementary lighting solutions, achieving uniform supplementary lighting across the entire focal length and improving image quality in different shooting scenarios.

[0076] above Figure 3 The lens zoom lighting control device based on filter adaptation in the embodiments of the present invention will be described in detail from the perspective of unitized functional entities. The lens zoom lighting control device based on filter adaptation in the embodiments of the present invention will be described in detail from the perspective of hardware processing.

[0077] Figure 4 This is a schematic diagram of a lens zoom lighting control device based on filter adaptation provided in an embodiment of the present invention. The lens zoom lighting control device 300 based on filter adaptation can vary significantly due to different configurations or performance characteristics. It may include one or more central processing units (CPUs) 410 (e.g., one or more processors) and a memory 420, and one or more storage media 430 (e.g., one or more mass storage devices) storing application programs 333 or data 432. The memory 420 and storage media 430 can be temporary or persistent storage. The program stored in the storage media 430 may include one or more units (not shown in the diagram), each unit may include a series of instruction operations on the lens zoom lighting control device 400 based on filter adaptation. Furthermore, the processor 410 can be configured to communicate with the storage medium 430 and execute a series of instruction operations in the storage medium 430 on the filter-adapted lens zoom lighting control device 400 to implement the steps of the above-described filter-adapted lens zoom lighting control method.

[0078] The lens zoom lighting control device 400 based on filter adaptation may also include one or more power supplies 440, one or more wired or wireless network interfaces 450, one or more input / output interfaces 460, and / or one or more operating systems 431, such as Windows Server, MacOSX, Unix, Linux, FreeBSD, etc. Those skilled in the art will understand that... Figure 4 The illustrated structure of the lens zoom lighting control device based on filter adaptation does not constitute a limitation on the lens zoom lighting control device based on filter adaptation provided by the present invention. It may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0079] The present invention also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when the instructions are executed on a computer, cause the computer to perform the steps of the lens zoom supplementary lighting control method based on filter adaptation.

[0080] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system, device, or unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0081] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0082] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lens zoom illumination control method based on filter adaptation, characterized in that, The lens zoom fill light control method includes: Obtain the zoom command from the camera, parse the zoom command, and obtain the current field of view; The fill light mode is determined based on the current field of view, and the current parameters of the three LEDs on the mobile phone are calculated based on the fill light mode to obtain the first current value, the second current value of the main light group and the third current value of the spotlight. The three LEDs are driven and controlled according to the first, second, and third current values, and corresponding supplementary light outputs are obtained through the combination of filters and lenses with different optical characteristics. The process of driving and controlling the three LEDs according to the first, second, and third current values, and obtaining corresponding supplementary light outputs through the combination of filters and lenses with different optical characteristics, includes: calculating the duty cycle of the pulse width modulation signal based on the first, second, and third current values ​​to obtain the first duty cycle corresponding to the first main lamp, the second duty cycle corresponding to the second main lamp, and the third duty cycle corresponding to the spotlight compensation lamp; inputting the first, second, and third duty cycles to three independent LED driving channels respectively, modulating and controlling the output current of each driving channel to obtain the actual driving current of the three LEDs; synchronously triggering the three LEDs according to the actual driving current, and using the superimposed light intensity output of the three LEDs as the supplementary light output.

2. The lens zoom fill light control method based on filter adaptation according to claim 1, characterized in that, The process of obtaining the zoom command from the camera and parsing the zoom command to obtain the current field of view includes: Extract the current focal length value from the zoom command; Obtain the sensor size parameters of the camera, and calculate the diagonal length of the sensor based on the sensor size parameters to obtain the sensor diagonal length; The current field of view is obtained by calculating the arctangent function of the field of view based on the current focal length and the diagonal length of the sensor.

3. The lens zoom fill light control method based on filter adaptation according to claim 1, characterized in that, The determination of the supplementary lighting mode based on the current field of view includes: The current field of view is compared with a preset first threshold and a second threshold. When the current field of view is greater than the first threshold, it is determined to be a wide-angle fill light mode. When the current field of view is less than or equal to the second threshold, it is determined to be a telephoto fill light mode; When the current field of view is greater than the second threshold and less than or equal to the first threshold, it is determined to be a mid-focus hybrid fill light mode.

4. The lens zoom fill light control method based on filter adaptation according to claim 1, characterized in that, The calculation of the current parameters of the three LEDs on the mobile phone according to the supplementary lighting mode to obtain the first current value, the second current value of the main light group, and the third current value of the spotlight includes: Based on the supplementary lighting mode type, the corresponding target illumination area is obtained, and the size and distance parameters of the target illumination area are calculated to obtain the coverage range of the target illumination area; Based on the coverage area and the spatial position of the three LEDs, the illuminance distribution of each LED on the target illumination plane is superimposed and calculated, and the total illuminance distribution of the target illumination plane is calculated based on the Lambert optical model. The illuminance uniformity is evaluated based on the total illuminance distribution. The illuminance uniformity is then adjusted by adjusting the current parameters of each LED lamp to achieve a preset threshold, resulting in the first current value, the second current value of the main lamp group, and the third current value of the spotlight.

5. The lens zoom fill light control method based on filter adaptation according to claim 4, characterized in that, The three LED lights are a first main light, a second main light, and a spotlight compensation light. The first main light and the second main light constitute a main light group. A diffusion filter is respectively installed in front of the first main light and the second main light for supplementary lighting in wide-angle and mid-range scenes. A spotlight compensation light is installed in front of a spotlight lens for supplementary lighting in telephoto scenes. The first main light, the second main light, and the spotlight compensation light are arranged in a triangle. The spotlight compensation light is located at the center of the triangle and is aligned with the optical axis of the telephoto lens of the mobile phone. The diffuser filter expands the beam angle of the main light group to a preset wide-angle range, and the focusing lens narrows the beam angle of the spotlight compensation light to a preset narrow-angle range.

6. The lens zoom fill light control method based on filter adaptation according to claim 5, characterized in that, The step of superimposing and calculating the illuminance distribution of each LED on the target illumination plane based on the coverage area and the spatial position of the three LEDs, and calculating the total illuminance distribution of the target illumination plane based on the Lambert optical model, includes: Multiple sampling points are set on the target lighting plane. The spatial straight-line distance from each sampling point to each LED and the incident angle of light are calculated to obtain the distance parameters and angle parameters corresponding to each LED. Based on the distance and angle parameters of each LED, the illuminance value of each LED at each sampling point is calculated using the Lambert optical model. The cosine of the incident angle is multiplied by the LED light intensity and then divided by the square of the distance to obtain the single-lamp illuminance distribution of each LED at each sampling point. The individual illuminance values ​​of the three LEDs at each sampling point are summed point by point to obtain the summed illuminance value of each sampling point. The summed illuminance values ​​of all sampling points are then spatially integrated to obtain the total illuminance distribution of the target illumination plane.

7. A lens zoom illumination control device based on filter adaptation, characterized in that, The lens zoom illumination control device based on filter adaptation includes: The instruction parsing module is used to obtain the zoom instruction from the camera, parse the zoom instruction, and obtain the current field of view. The current calculation module is used to determine the supplementary lighting mode based on the current field of view, and to calculate the current parameters of the three LED lights on the mobile phone based on the supplementary lighting mode, so as to obtain the first current value, the second current value of the main light group and the third current value of the spotlight. The drive control module is used to drive and control three LEDs according to the first current value, the second current value, and the third current value, and obtain corresponding supplementary light output through the cooperation of filters and lenses with different optical characteristics. The process of driving and controlling the three LEDs according to the first current value, the second current value, and the third current value, and obtaining corresponding supplementary light output through the cooperation of filters and lenses with different optical characteristics includes: calculating the duty cycle of the pulse width modulation signal according to the first current value, the second current value, and the third current value to obtain the first duty cycle corresponding to the first main lamp, the second duty cycle corresponding to the second main lamp, and the third duty cycle corresponding to the spotlight compensation lamp; inputting the first duty cycle, the second duty cycle, and the third duty cycle to three independent LED drive channels respectively, modulating and controlling the output current of each drive channel to obtain the actual drive current of the three LEDs; synchronously triggering the three LEDs according to the actual drive current, and using the superimposed light intensity output of the three LEDs as the supplementary light output.

8. A lens zoom illumination control device based on filter adaptation, characterized in that, The lens zoom lighting control device based on filter adaptation includes: a memory and at least one processor, wherein the memory stores instructions; The at least one processor invokes the instructions in the memory to cause the filter-adapted lens zoom lighting control device to perform the steps of the filter-adapted lens zoom lighting control method as described in any one of claims 1-6.

9. A computer-readable storage medium storing instructions thereon, characterized in that, When the instruction is executed by the processor, it implements the steps of the lens zoom fill light control method based on filter adaptation as described in any one of claims 1-6.

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