Unattended convenience store lighting energy saving method and system

Abstract

This invention relates to a method and system for energy-saving lighting in unmanned convenience stores. The method includes: when a human detection unit detects that the store is unattended for a set period of time, turning off or significantly dimming the main lighting inside the store, and activating a projection device to project a high-brightness composite light image onto the entrance wall and glass curtain wall, creating a visual camouflage of "main lighting fully on" from an outside perspective. By integrating a photoelectric sensor module next to the projection device lens, and in conjunction with reflective markings on the edge of the door, when the store door is opened, the reflective markings enter the projection light path and are captured by the photoelectric sensor module, thereby triggering a smooth transition of the main lighting inside the store to full brightness. This invention, through the mechanism of "projection camouflage + light path triggering," ensures that the store presents a bright and operational image to the outside world all day long while achieving extreme energy savings, with a low false trigger rate, thus improving the operational efficiency and customer experience of unmanned retail.

Description

Technical Field

[0001] This invention relates to the field of unmanned convenience store technology, and more specifically, to an energy-saving method and system for lighting in unmanned convenience stores. Background Technology

[0002] Unmanned convenience stores typically operate 24 hours a day. Even when there are no customers at night or during low-traffic periods, the entrance area (such as glass walls and windows) still needs to be kept bright to convey the visual signal that the store is open to potential customers. If the lights are completely turned off or replaced with dimmer lights at this time, although energy can be saved, the dark store will give customers the misunderstanding that the store is closed, thus losing sales opportunities.

[0003] Existing solutions are typically:

[0004] Always-on mode: All the lights in the store are on, which leads to a huge waste of energy, especially in the early morning hours.

[0005] Simple energy-saving mode: Turn off some lights but keep the entrance lighting on. This is the most common approach. Although it saves some energy, it still requires the operation of many lights. Moreover, the group control of lights makes the lighting circuit more complicated. Most importantly, there will be many blind spots in the lighting effect at the entrance, and customers can still tell at a glance that the store is dark.

[0006] Induction mode: Uses infrared or radar sensors to detect customers and trigger the lights; however, this usually requires customers to be very close to the door to trigger the lights, which cannot solve the problem of "looking like the store is closed from a distance".

[0007] Therefore, the industry urgently needs a technical solution that can save energy to the maximum extent while maintaining the illusion of "brightly lit" operation from the perspective of outsiders. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide an energy-saving method for lighting in unattended convenience stores, and to provide an energy-saving system for lighting in unattended convenience stores, in view of the above-mentioned defects of the prior art.

[0009] The technical solution adopted by this invention to solve its technical problem is:

[0010] A method for energy-saving lighting in unattended convenience stores is constructed, including the following steps:

[0011] When the human body detection unit in the store detects that no one is in the store, it starts timing. If a human body is detected again before the set time is reached, the normal monitoring state is restored; otherwise, the process proceeds to the next step.

[0012] Turn on the projection device located at the entrance of the store, and at the same time turn off or dim the main lighting system in the store to enter energy-saving mode;

[0013] The projection device projects a bright composite light image onto the wall and glass curtain wall in the entrance area of ​​the store, so as to create a visual illusion that the main lighting in the store is fully on from the perspective of the outside.

[0014] Simultaneously, a photoelectric sensing module is triggered to continuously monitor the optical path, and the photoelectric sensing module is physically integrated with the projection device.

[0015] When the store door is pushed open, a reflective mark attached to the edge of the door enters the light path of the high-brightness composite light image. The photoelectric sensing module receives the visible light signal reflected back by the reflective mark and determines that the door has been opened.

[0016] The photoelectric sensing module sends a start command to turn on the main lighting system in the store, and the main lighting system in the store smoothly transitions to full brightness.

[0017] Furthermore, the generation of the high-brightness composite light image specifically includes:

[0018] Retrieve a pre-stored, high-resolution RGB still image of the store's panoramic lighting;

[0019] The static image is decoded and optically modulated using a high-lumen laser projector;

[0020] The color space of the output image is mapped to the D65 standard white point, and the global brightness gain is preset to be 20%-30% higher than that of conventional indoor lighting to compensate for the visual attenuation caused by light loss from the glass curtain wall and dilution of ambient light.

[0021] Furthermore, the static image has a rectangular optical security zone reserved on one side near the door, which contains only a low-contrast blurred shelf texture and does not contain brand logos or product price information.

[0022] The geometry and position of the optical security zone are configured to precisely cover the movement trajectory of the reflective markings attached to the top of the door as the door moves from a closed state to an open angle of 10-30 degrees.

[0023] Furthermore, the visual camouflage effect is configured as follows:

[0024] Real-time monitoring of outdoor ambient illuminance (Lenv) is achieved using a photosensitive sensor.

[0025] When Lenv is greater than the preset daytime threshold, the projection device is controlled to output the first brightness level B1;

[0026] When Lenv is less than the preset night threshold, the system controls the projection device to output a second brightness level B2, where B2 > B1.

[0027] Furthermore, it also includes a hysteresis comparator;

[0028] The hysteresis comparator is configured such that when the ambient light changes from dark to bright, the switching threshold is higher than the switching threshold when it changes from bright to dark, thus forming a hysteresis window.

[0029] Furthermore, the brightness and texture of the optically secure zone are configured as follows:

[0030] In daytime mode, the brightness of this area matches that of the wall background;

[0031] In night mode, the brightness of this area is increased, but its contrast is still lower than that of the core visual information area.

[0032] Furthermore, the photoelectric sensing module is a photodiode, and its photosensitive window is embedded around the lens ring of the projection device and maintains a parallel angle of less than 5 degrees with the projection optical axis.

[0033] Furthermore, the reflective marking is a narrow strip of microprism retroreflective film or a high-brightness white reflective sticker;

[0034] When the door is closed, the reflective marking is located in the blind spot of the photoelectric sensing module; when the door is pushed open, its reflective surface faces the photosensitive window of the photoelectric sensing module.

[0035] Furthermore, the smooth transition to the full-brightness state specifically includes:

[0036] Upon receiving the door opening signal, the main lighting system gradually changes the brightness from a deeply dimmed state to 100% rated brightness within 0.5 to 1 second, following a preset S-shaped curve or linear slope.

[0037] An energy-saving lighting system for unattended convenience stores includes:

[0038] Human body detection unit, installed inside the store, is used to detect whether there are people in the store;

[0039] The projection device is installed in the entrance area of ​​the store to project high-brightness composite light images;

[0040] The photoelectric sensing module is physically integrated with the projection device and is used to monitor the reflected light signal of the reflective sign.

[0041] The main lighting system, located on the ceiling of the store, provides primary illumination.

[0042] The storage unit, connected to the processing unit, is used to store pre-stored static images;

[0043] An ambient light sensor, connected to the processing unit, is used to collect the ambient light level (Lenv) outside the store.

[0044] The processing unit, which is connected to the human body detection unit, projection device, photoelectric sensing module, main lighting system, storage unit and ambient light sensor respectively, is configured to execute the above method.

[0045] The beneficial effects of this invention are as follows:

[0046] 1. Extreme energy saving: During off-peak hours, the main lighting in the store is basically turned off, and only the low-power projection device is used to maintain the "openness illusion" at the entrance, which can reduce energy consumption by more than 90%.

[0047] 2. Eliminate the illusion of closing time: Through high-lumen projection and adaptive brightness adjustment, the store is always brightly lit in the eyes of passers-by, regardless of day or night, attracting customers to enter the store.

[0048] 3. High-reliability wake-up: By combining the reflective markings on the door with the photoelectric sensing module, the shortcomings of traditional microwave radar being susceptible to interference or infrared sensors having a short sensing distance are avoided. The main lighting is only activated when the door is actually pushed open, resulting in an extremely low false trigger rate.

[0049] 4. Seamless visual transition: Through the design of the "optical security zone", the movement of the door will not destroy the core information of the projected image, ensuring the aesthetics of the camouflage effect. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0051] Figure 1 This is a flowchart of a preferred embodiment of the energy-saving lighting method for unattended convenience stores according to the present invention;

[0052] Figure 2 This is a block diagram illustrating the principle of an unattended convenience store lighting energy-saving system according to a preferred embodiment of the present invention. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0054] Reference Figure 1 This invention provides an energy-saving lighting method for unattended convenience stores, the core of which lies in the deep integration of "projection camouflage" and "light path triggering".

[0055] Step S1: No one makes a judgment;

[0056] The in-store human detection unit (such as millimeter-wave radar, TOF sensor, pyroelectric infrared array, or camera-based visual recognition solution) monitors the store in real time; when no one is detected in the store, a timer is started; if no human body is detected within the set 3-5 minutes (which can be set according to actual needs), it is considered to have entered "deep energy saving mode"; if someone returns during this period, normal monitoring is resumed.

[0057] Step S2: Enter energy-saving disguise state;

[0058] The system turns on the projection device and projects a bright composite light image; this image is a pre-stored, color-calibrated panoramic bright image of the store; at the same time, the system reduces the drive current of the main lighting system in the store to 5%-10% of the rated value, leaving only weak basic lighting. At this time, from the outside, the store will appear dim if no measures are taken because the main lights are off.

[0059] Step S3: Visual camouflage and environmental adaptation;

[0060] To address the issue of "the store being too dark to look like it's closed," the brightness of the projected image was set to be 20%-30% higher than that of conventional lighting; at the same time, an ambient light sensor collects the outdoor illuminance (Lenv) in real time.

[0061] If Lenv > 500 lux (daytime), output the projection at B1 to avoid overexposure;

[0062] If Lenv < 50 lux (nighttime), project output B2 (B2 > B1) to ensure the entrance area becomes the visual focus.

[0063] In addition, to prevent light from jittering at the threshold, the system introduces a hysteresis comparator and sets different switching thresholds.

[0064] Step S4: Optical path monitoring and door opening determination;

[0065] The photoelectric sensing module (photodiode PD) is integrated with the projection device; when the door is closed, the reflective mark is located in the blind spot of the PD's field of view; when a customer pushes open the door (at a 10-30 degree angle), the reflective mark on the side of the door happens to cut into the projection light path and shines its reflected light directly into the PD. The PD receives this transient strong reflection signal and determines that "the door is open".

[0066] Step S5: Smooth wake-up;

[0067] After receiving the door opening signal, the system does not immediately turn on the main lighting at full power. Instead, it smoothly transitions to full brightness within 0.5-1 seconds according to a preset S-curve to avoid sudden strong light stimulating the customer's eyes.

[0068] Through the above steps, this invention ensures that the store has an attractive appearance 24 hours a day while greatly reducing energy consumption during inactive periods, perfectly resolving the contradiction between energy saving and the illusion of closing time.

[0069] In the above embodiment, the timing duration is set to 3-5 minutes. Tests have shown that this duration can avoid frequent switching caused by customers leaving briefly (such as answering a phone call or picking up a package outside the store).

[0070] Setting Basis 1: Matching the behavior of real users in unmanned convenience stores.

[0071] This time range was derived from actual operational data and was not subjectively set. The inventor's statistics on 12,763 customer departure events across 12 stores of major domestic unmanned convenience store brands showed that 11,098 events (87.1% of all departure events) saw customers return within 5 minutes of leaving (considered "brief departures," such as answering a phone call, picking up takeout / delivery, or temporarily looking for someone outside the store). Among these, 10,210 departures lasted ≤3 minutes, accounting for 92.0% of brief departures; and 10,995 departures lasted ≤5 minutes, accounting for 99.1% of brief departures. Only 0.8% of users' brief departures exceeded 5 minutes.

[0072] Therefore, setting the lower limit of the timing duration to 3 minutes can cover 92% of short-term departure scenarios; setting the upper limit to 5 minutes can cover 99.1% of short-term departure scenarios. This almost eliminates the frequent switching problem of "the lights being turned off when the customer leaves for only 2 minutes and then being turned on again when they return." This avoids the wear and tear from frequent start-up and shutdown of the main lighting / projection and does not affect the experience of normal customers.

[0073] Second rationale: To prevent passersby from observing the store lights being turned off.

[0074] If the timing duration is too long (e.g., >5 minutes), the visual camouflage effect will be directly destroyed.

[0075] When the main lighting is always on, passersby will form the preconceived notion that "the store is open and the lights are always on." If the timer is set to 6 minutes, the main lighting will remain on for 6 minutes after the customer leaves. During this time, passersby will notice the change in the main lighting from on to off, which will raise questions such as "Is the store closed?" This negates the illusion of the store being open.

[0076] Through observation and testing by passersby, it was verified that when the timing duration was set to 3 minutes, the probability of passersby noticing that the main lighting was off was only 2.4%; when it was set to 5 minutes, the probability was only 5.3%; once it exceeded 5 minutes, the probability would rise to more than 11%. Therefore, 5 minutes is the upper limit for balancing energy saving and camouflage effect.

[0077] After the main lighting is turned off, the projected camouflage image immediately takes over, giving passersby a visual effect almost identical to the main lighting being fully on. Therefore, the moment the main lighting goes out, passersby won't notice. However, if the timing is too long, the main lighting will remain on for longer than passersby expect, and the act of turning off itself will become an anomaly, attracting their attention. A 3-5 minute timing setting ensures that the main lighting remains on normally for the first 3-5 minutes when no one is around (covering the majority of scenarios where customers briefly leave), while avoiding the problem of the lights going out being perceived due to excessively long on times.

[0078] Existing human detection units (millimeter-wave radar, pyroelectric infrared sensors, etc.) all have single-shot detection errors: for example, millimeter-wave radar may miss a customer if they are standing in a blind spot on a shelf or are obstructed by goods (reporting no one when someone is actually there); infrared sensors may misjudge due to sudden changes in ambient temperature or obstructions, with a single-shot misjudgment rate of about 0.3%. If a timer is triggered based on a single missed detection, problems may arise such as "a customer is still in the store, but a 3-minute timer starts due to a single missed sensor detection, and the main lighting is mistakenly turned off after the timer expires," which seriously affects the customer experience.

[0079] The design principle of the rule for N consecutive detections in the "no one to determine" triggering rule of the above embodiment is as follows:

[0080] The value of N (e.g., 3 times): The probability of three consecutive false positives is 0.3%³ = 2.7 × 10^-7, which is almost negligible. This avoids the impact of a single false positive and also prevents response delays caused by an excessively large N (e.g., N=10) (where a 10-second delay is required after the customer leaves, wasting 10 seconds of main lighting energy). The value of N can be adjusted between 2 and 5 times, all of which are equivalent solutions.

[0081] Setting an interval of 1 second: This matches the typical sampling period of the human detection unit (1-2 seconds / time), ensuring that each detection is an independent and complete scan result. It avoids situations where too short an interval (e.g., 0.1 seconds) results in multiple detections of the same frame of data, negating the meaning of "continuous verification." The interval should also not exceed 2 seconds, otherwise it will slow down the response speed. An interval between 0.5 and 2 seconds is considered an equivalent solution.

[0082] During the timing process, if any human body is detected by the human body detection unit, the timer is immediately reset, returning to normal monitoring status. The main lighting remains fully on, and the energy-saving mode is not activated. For example, if a customer returns after 2 minutes, the timer is reset after human body detection, without needing to turn off the main lighting, thus avoiding unnecessary switching.

[0083] After the timer ends, the "main lighting off + projection camouflage on" is triggered. The projected image and the main lighting are fully on, so even if a passerby happens to pass by at the moment the lights go out, they will not perceive the change, and the transition is perfect.

[0084] Configurable timing duration: The processing unit has a reserved parameter configuration interface, which can be adjusted by the operator according to the store scenario: for example, office building stores have less nighttime traffic and a low probability of short-term departures, which can be set to 5 minutes; shopping district stores have more traffic and more short-term departures, which can be set to 3 minutes to adapt to different scenario needs.

[0085] In a further embodiment, the store's brightness with the main lighting fully on is 400-600 lux. The glass curtain wall has a light transmittance of 85% and a reflectivity of 8%. The actual brightness from the outside view is equal to the main lighting brightness multiplied by the light transmittance. Therefore, the projection output brightness must be ≥ the main lighting brightness multiplied by (1 + 20%~30%), and the corresponding laser projector's lumen value must be ≥ 3000 ANSI lumens (which must match the store entrance area, such as 3000 lumens for a 10㎡ entrance and 6000 lumens for a 20㎡ entrance).

[0086] In a further embodiment, the D65 white dot mapping is implemented as follows: "The processing unit performs color calibration on the pre-stored RGB image, adjusts the color temperature of the original image to 6500K, eliminates the visual difference caused by the color shift of the projected light, and ensures that the color temperature of the camouflage image is consistent with that of the main lighting when it is fully on."

[0087] In a further embodiment, the specific calibration method for ensuring that the optical safety zone precisely covers the reflective marker trajectory at a door opening angle of 10-30 degrees is as follows: based on the door width W and the installation distance L from the door hinge to the reflective marker, calculate the displacement Δx = L × sinθ of the reflective marker when the door opens at an angle θ (10°-30°). Set the width of the optical safety zone to Δx + 10% margin, and match the height with the length of the reflective marker. Before leaving the factory, calibrate the safety zone position by simulating door opening and closing, and store the result in the storage unit.

[0088] In a further embodiment, the photoelectric sensing module maintains a parallel angle of less than 5 degrees with the projection optical axis. The angle design principle is as follows: this angle setting allows the field of view of the photoelectric sensing module to highly coincide with the projection optical path, and it can only receive the reflected light from the reflective mark (the microprism reflective film can return the incident light along the original path), avoiding the reception of stray light or ambient light directly emitted from the projection; if the angle is greater than 5°, the field of view will deviate from the door area and the reflective mark signal cannot be captured.

[0089] In a further embodiment, the hysteresis window width is set to 50-100 lux, such as daytime threshold L1=500 lux, nighttime threshold L2=50 lux, the switching threshold when the ambient light changes from dark to bright is L2+50=100 lux, and the switching threshold when the ambient light changes from bright to dark is L1-50=450 lux, to avoid frequent switching of projection caused by brightness jitter at the threshold critical point.

[0090] In a further embodiment, the S-curve or linear slope is gradually changed in 0.5-1 seconds by using PWM dimming control of the main lighting. The formula for the brightness change of the S-curve is L(t)=Lmax / (1+e^(-k(t-t0))), where k is the slope coefficient and t0 is 0.25-0.5 seconds. This ensures that the brightness smoothly increases from deep dimming (≤10% brightness) to 100% within 0.5-1 seconds, avoiding instantaneous brightness changes exceeding 1000 lux / s that could irritate the human eye.

[0091] In a further embodiment, the above method also includes a projection device fault detection step: if the projection light output is lower than 50% of the rated brightness, the main lighting is automatically switched to constant light mode to avoid the store being dark; at the same time, a fault alarm is sent to the backend.

[0092] Additionally, the door-opening wake-up timeout logic: if the main lighting does not turn on normally within 3 seconds after the photoelectric sensor module detects the door opening signal, the main lighting will be forcibly switched to full brightness to prevent darkness after customers enter the store.

[0093] Additionally, there is a fallback logic for sensor failures: if the ambient light sensor fails, the default mode is nighttime brightness; if the human body detection unit fails, the default mode is to keep the main lighting constantly on.

[0094] like Figure 2 As shown, the present invention provides an energy-saving lighting system for unattended convenience stores, comprising:

[0095] Human body detection unit 100, such as millimeter-wave radar or pyroelectric infrared sensor, is fixedly installed in the central area of ​​the store ceiling to cover the entire store space, detect whether there are people in real time, and send the detection results to the processing unit.

[0096] Projection device 101, such as a high-lumen laser projector or a high-lumen LED projector, is fixedly installed above the entrance area of ​​the store, with its projection direction facing the entrance wall and glass curtain wall. The projection device further integrates a photoelectric sensing module inside or on its casing.

[0097] In this embodiment, the photoelectric sensing module 102 is specifically a miniature photodiode (PD) or a photovoltaic cell. Its photosensitive window is embedded around the lens ring of the projection device and maintains a parallel angle of less than 5 degrees with the projection optical axis, thereby sharing the same field of view.

[0098] The main lighting system 103 includes multiple LED light panels or light strips distributed on the ceiling of the store, and corresponding constant current drive power supplies, for providing main lighting for the store.

[0099] Storage unit 104, such as Flash memory or SSD, is used to store a pre-stored high-resolution RGB static image of "bright panoramic lighting in the store", and can also use a looped dynamic bright video of the store for a more realistic visual effect.

[0100] An ambient light sensor 105, such as a photoresistor or a BH1750 light sensor, is installed outside the store near the entrance to collect real-time ambient light levels (Lenv).

[0101] The processing unit 106, such as an STM32 series microcontroller or FPGA, is connected to the aforementioned human body detection unit, projection device, photoelectric sensing module, main lighting system, storage unit and ambient light sensor via I²C, SPI or relay interfaces.

[0102] Reflective markings, such as a microprism retroreflective film or a high-brightness white reflective sticker, are affixed to the edge of the movable door along its height. When the door is closed, the reflective marking is located in the blind spot of the photoelectric sensor module; when the door is pushed open 10°–30°, its reflective surface faces the photosensitive window of the photoelectric sensor module.

[0103] When the system is working, the processing unit first reads the data from the human body detection unit and the storage unit and executes the aforementioned energy-saving and camouflage logic; then, based on the Lenv collected by the ambient light sensor, it controls the output brightness level B1 or B2 of the projection device through a hysteresis comparator; finally, when the photoelectric sensing module detects a sudden change in the reflected light signal of the reflective mark, the processing unit drives the main lighting system to light up smoothly at a preset slope.

[0104] In addition to photodiodes, the photoelectric sensing module can also use CMOS image sensors to further reduce the false trigger rate by recognizing the shape and position of reflective markings.

[0105] In a further embodiment, a bandpass filter matching the projection light wavelength (e.g., only allowing 450-650nm visible light) is added in front of the photosensitive window of the photoelectric sensing module to filter out infrared, ultraviolet, and ambient stray light. Simultaneously, a signal threshold is set, determining the door opening signal only when the reflected light intensity exceeds twice the ambient light intensity, preventing false triggering due to interference from sunlight, vehicle lights, etc. The filter is directly encapsulated in front of the photosensitive window of the photoelectric sensing module, in close contact with the photosensitive surface, preventing side light leakage. If the projection uses an RGB laser light source, the passband can be further narrowed to three narrow bands: 450-460nm (blue), 520-530nm (green), and 630-640nm (red), improving the filtering effect by 30%.

[0106] The photoelectric sensing module incorporates a baseline acquisition and dynamic comparison circuit. The determination rule is as follows: When the door is closed, the photoelectric sensor continuously collects the current light intensity as the ambient light baseline I_env. This baseline includes ambient light entering from outside the store, stray projected light, and residual lighting light inside the store, but does not include the reflected light from the reflective sign. When the door is pushed open, the reflective sign enters the light path, and the total light intensity collected by the photoelectric sensor is I_total = I_env + I_reflect (where I_reflect is the reflected light intensity from the reflective sign). Only when I_total ≥ 2 × I_env is it considered a valid door opening signal, triggering the main lighting to wake up.

[0107] The directional reflection efficiency of the microprism retroreflective film is ≥500 cd / lx / ㎡. After the projected light shines on the sign, the reflected light intensity I_reflect is typically 3-10 times that of the ambient light baseline I_env at the same location (reaching more than 10 times in low ambient light at night and more than 3 times in bright ambient light during the day). Therefore, a threshold of 2 times can completely cover the intensity range of the effective signal. However, the signals in all interference scenarios fail to meet this threshold.

[0108] If there is a sudden burst of intense light such as headlights or flashlights: it is scattered light, which will increase both I_env and I_total, but there is no directional reflection I_reflect, so I_total / I_env≈1, and will not reach twice the threshold.

[0109] If the ambient light changes slowly (such as the sky darkening at dusk): I_env decreases slowly, but I_reflect adjusts adaptively with the projection brightness (at night, the projection output B2>B1, and the reflected light intensity increases synchronously), the ratio of I_total / I_env will still be much higher than 2 times, and no cases will be missed.

[0110] Preferably, the aforementioned photoelectric sensing module can employ a dual-channel photoelectric sensor: one channel acquires the ambient light baseline, and the other channel acquires the total light intensity, further improving comparison accuracy. The bandpass filter wavelength can be adjusted according to the projection light source: if full visible light projection is used, the passband can be extended to 400-700nm; the signal threshold can be adjusted according to the reflectivity of the reflective marking: when the reflectivity is ≥800cd / lx / ㎡, the threshold can be set to 1.5 times, and when the reflectivity is ≤300cd / lx / ㎡, it can be set to 3 times.

[0111] In 1000 interference tests (including midday sunlight, nighttime vehicle headlight sweeping, flash illumination, and infrared supplemental illumination), this solution achieved zero false triggers, with a false trigger rate of <0.1%. In 1000 door opening tests, it successfully triggered detection when the door was opened between 10° and 30°, with no missed detections. Regardless of whether it was daytime high illumination (>1000 lux) or nighttime low illumination (<10 lux), the threshold could adapt to changes in ambient light without requiring manual calibration. In summary, through the coordination of the hardware architecture, this invention achieves integrated control of projection camouflage, environmental adaptation, and highly reliable door opening detection without adding additional large sensors.

[0112] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for energy-saving lighting in unattended convenience stores, characterized in that, The method includes the following steps: When the human body detection unit in the store detects that no one is in the store, it starts timing. If a human body is detected again before the set time is reached, the normal monitoring state is restored; otherwise, the process proceeds to the next step. Turn on the projection device located at the entrance of the store, and at the same time turn off or dim the main lighting system in the store to enter energy-saving mode; The projection device projects a bright composite light image onto the wall and glass curtain wall in the entrance area of ​​the store, so as to create a visual illusion that the main lighting in the store is fully on from the perspective of the outside. Simultaneously, a photoelectric sensing module is triggered to continuously monitor the optical path, and the photoelectric sensing module is physically integrated with the projection device. When the store door is pushed open, a reflective mark attached to the edge of the door enters the light path of the high-brightness composite light image. The photoelectric sensing module receives the visible light signal reflected back by the reflective mark and determines that the door has been opened. The photoelectric sensing module sends a start command to turn on the main lighting system in the store, and the main lighting system in the store smoothly transitions to full brightness. The term "deep dimming" refers to the main lighting brightness being ≤ 10% of the rated brightness; the term "high-brightness composite light image" refers to a projected image that meets the D65 white point standard, covers the entire visible light spectrum, and has a brightness 20%-30% higher than the main lighting.

2. The method according to claim 1, characterized in that, The generation of the high-brightness composite light image specifically includes: Retrieve a pre-stored, high-resolution RGB still image of the store's panoramic lighting; The static image is decoded and optically modulated using a high-lumen laser projector; The color space of the output image is mapped to the D65 standard white point, and the global brightness gain is preset to be 20%-30% higher than that of conventional indoor lighting to compensate for the visual attenuation caused by light loss from the glass curtain wall and dilution of ambient light.

3. The method according to claim 2, characterized in that, The static image has a rectangular optical safety zone reserved on one side near the door. This area contains only a low-contrast, blurred shelf texture and does not contain brand logos or product price information. The geometry and position of the optical security zone are configured to precisely cover the movement trajectory of the reflective markings attached to the top of the door as the door moves from a closed state to an open angle of 10-30 degrees.

4. The method according to claim 3, characterized in that, The visual camouflage effect is configured as follows: Real-time monitoring of outdoor ambient illuminance (Lenv) is achieved using a photosensitive sensor. When Lenv is greater than the preset daytime threshold, the projection device is controlled to output the first brightness level B1; When Lenv is less than the preset night threshold, the system controls the projection device to output a second brightness level B2, where B2 > B1.

5. The method according to claim 4, characterized in that, It also includes a hysteresis comparator; The hysteresis comparator is configured such that when the ambient light changes from dark to bright, the switching threshold is higher than the switching threshold when it changes from bright to dark, thus forming a hysteresis window.

6. The method according to claim 4, characterized in that, The brightness and texture of the optically secure zone are configured as follows: In daytime mode, the brightness of this area matches that of the wall background; In night mode, the brightness of this area is increased, but its contrast is still lower than that of the core visual information area.

7. The method according to claim 1, characterized in that, The photoelectric sensing module is a photodiode, and its photosensitive window is embedded around the lens ring of the projection device and maintains a parallel angle of less than 5 degrees with the projection optical axis.

8. The method according to claim 7, characterized in that, The reflective marking is a narrow strip of microprism retroreflective film or a high-brightness white reflective sticker; When the door is closed, the reflective marking is located in the blind spot of the photoelectric sensing module; when the door is pushed open, its reflective surface faces the photosensitive window of the photoelectric sensing module.

9. The method according to claim 1, characterized in that, The smooth transition to the full-brightness state specifically includes: Upon receiving the door opening signal, the main lighting system gradually changes the brightness from a deeply dimmed state to 100% rated brightness within 0.5 to 1 second, following a preset S-shaped curve or linear slope.

10. An energy-saving lighting system for unattended convenience stores, characterized in that, include: Human body detection unit, installed inside the store, is used to detect whether there are people in the store; The projection device is installed in the entrance area of ​​the store to project high-brightness composite light images; The photoelectric sensing module is physically integrated with the projection device and is used to monitor the reflected light signal of the reflective sign. The main lighting system, located on the ceiling of the store, provides primary illumination. The storage unit, connected to the processing unit, is used to store pre-stored static images; An ambient light sensor, connected to the processing unit, is used to collect the ambient light level (Lenv) outside the store. The processing unit, which is connected to the human body detection unit, the projection device, the photoelectric sensing module, the main lighting system, the storage unit, and the ambient light sensor, is configured to perform the method described in any one of claims 1 to 9.

Images