A video frame time interval verification device

Abstract

This utility model relates to the field of forensic identification of physical evidence from road traffic accidents, specifically to a video inter-frame time interval verification device, comprising: a housing with an LED installation area on the front; LED groups installed in the installation area according to functional partitions, including: a first LED area with a first group of LEDs connected to a first control signal; a second LED area with a second group of LEDs connected to a second control signal; a third LED area with a third group of LEDs connected to a third control signal; and a controller outputting the first, second, and third control signals. This utility model uses a controllable LED flashing sequence as a high-precision time reference and generates quantifiable time markers through video capture, achieving accurate verification of inter-frame time intervals.

Description

Technical Field

[0001] This utility model relates to the field of forensic identification of physical evidence from road traffic accidents, specifically to a video frame time interval verification device. Background Technology

[0002] Forensic opinions on vehicle speed are crucial evidence in judicial practice for determining liability in traffic accidents and judging the guilt or innocence of relevant parties. Video footage, due to its objective recording nature, has become the primary source of evidence in vehicle speed assessments. According to the classic kinematic formula (velocity = displacement / time), displacement and time are the only two core variables affecting the results of vehicle speed assessments. However, in practice, the videos used for assessment are mostly roadside surveillance videos, and assessors typically cannot obtain the specific technical parameters of the cameras. More importantly, such video materials generally suffer from frame rate anomalies (such as frame skipping, stuttering, inaccurate timestamps, etc.), causing the displayed time information to differ from the actual elapsed time. Therefore, precise temporal verification and analysis of the video material itself is a necessary prerequisite for ensuring the accuracy and reliability of vehicle speed assessment results. The current national standard GB / T 33195-2016, "Road Traffic Accident Vehicle Speed ​​Appraisal," clearly stipulates that video vehicle speed appraisal should be conducted in accordance with GA / T 1133, "Technical Appraisal of Vehicle Speed ​​Based on Video Images." Furthermore, Clause 3.4.1 of GA / T1133-2014 requires that "the display time of the video image should be calibrated, and the calibrated time should be used for calculation." Unfortunately, this standard does not provide a specific time calibration method.

[0003] The currently prevalent analytical methods in the industry primarily rely on combining the display timestamps inherent in video images with the frame rate information claimed in the file, and inferring the true inter-frame time intervals by analyzing the rationality of object motion trajectories frame by frame. This method is essentially based on theoretical analysis of video generation mechanisms, selecting time parameters for speed calculation by setting upper and lower thresholds in the time domain. However, this method has significant limitations: its analysis results often lead to excessively large calculated vehicle speed ranges, which may even include critical thresholds such as legal speed limits, making the expert conclusions ambiguous and failing to meet the requirements of judicial practice for the precision of evidence.

[0004] Therefore, there is currently a lack of high-precision, quantitative detection and verification technology for the frame interval of road surveillance videos, and there is an urgent need to develop a new type of video time calibration device suitable for complex field environments. Utility Model Content

[0005] To address the above technical problems, this utility model provides a video frame time interval verification device.

[0006] The technical problem solved by this utility model can be achieved by the following technical solution:

[0007] A video inter-frame time interval verification device, comprising:

[0008] The housing has a lamp bead mounting area on its front side;

[0009] LED chip assemblies, installed in the LED chip mounting area according to functional zones, include:

[0010] The first LED bead area is provided with a first group of LED beads, and the first group of LED beads is connected to a first control signal;

[0011] The second LED bead area is provided with a second group of LED beads, and the second group of LED beads is connected to a second control signal;

[0012] The third LED bead area is provided with a third group of LED beads, and the third group of LED beads is connected to a third control signal;

[0013] The controller outputs the first control signal, the second control signal, and the third control signal.

[0014] Preferably, the first group of LED beads is green LED beads, arranged longitudinally at equal intervals on the left side of the LED bead installation area;

[0015] The second group of LED beads are red LED beads, arranged in a matrix with equal spacing in the lower right area of ​​the LED bead installation area;

[0016] The third group of LED beads are composite color LED beads, which are arranged horizontally in the upper right area of ​​the LED bead installation area;

[0017] The spatial distribution of the three groups of LED beads is as follows:

[0018] In the horizontal direction, the first group of LED beads is located to the left of the second group of LED beads and the third group of LED beads;

[0019] In the vertical direction, the second group of LED beads is located directly below the third group of LED beads, the bottom of the second group of LED beads is flush with the bottom of the first group of LED beads, and the top of the third group of LED beads is flush with the top of the first group of LED beads.

[0020] Preferably, the first control signal is a first timing pulse signal that drives the first group of LED beads to light up sequentially according to the target frame rate mode;

[0021] The second control signal is a second timing pulse signal that drives the second group of LED beads to light up cyclically at fixed time intervals; wherein, the fixed time interval is 10ms;

[0022] The third control signal is a composite level signal that drives the third group of LED beads to trigger color switching when the second group of LED beads completes two cycles of illumination, and supports multiple color changes, including red (R), green (G), blue (B), yellow (R+G), and cyan (G+B).

[0023] Preferably, the target frame rate is divided into multiple frame rate modes, including 5fps, 12fps, 15fps, 18fps, 20fps, 25fps, 30fps, and 36fps.

[0024] Preferably, the diameter of the lamp bead is 88mm, and each lamp bead is provided with a reflector around its periphery, the opening end of the reflector being flush with the surface of the housing.

[0025] Preferably, the back of the enclosure is provided with a power supply compartment and a movable cover for covering the power supply compartment, and a built-in power supply is installed inside the power supply compartment.

[0026] Preferably, the built-in power supply is a removable battery with a capacity of 83Wh, which is electrically connected to the LED assembly and the controller via wires.

[0027] Preferably, the side of the housing is equipped with function buttons and a display screen, and the function buttons and the display screen are electrically connected to the controller; the function buttons include a start button, a stop button, a confirmation button and a mode selection button.

[0028] Preferably, the housing is made of aluminum alloy.

[0029] Preferably, a top handle is fixedly installed on the top of the box, and side handles are fixedly installed on the left and right sides of the box.

[0030] Beneficial effects: By adopting the above technical solution, this utility model realizes multi-state, independent control and display of video frame time intervals by dividing the LED beads into functional zones and connecting them to independent control signals, thereby improving the intuitiveness, accuracy and ease of operation of the verification. Attached Figure Description

[0031] Figure 1 This is a structural diagram of the verification device of this utility model;

[0032] Figure 2 This is a rear view of the verification device of this utility model;

[0033] Figure 3 This is a schematic diagram of the lamp bead assembly of this utility model;

[0034] Figure 4 This is a schematic diagram of the controller 1 of this utility model.

[0035] Figure 5This is a schematic diagram of the controller 2 of this utility model.

[0036] Figure 6 This is a schematic diagram of the controller 3 of this utility model.

[0037] Explanation of reference numerals in the attached diagram: 1. Display screen; 2. Function button; 3. Cabinet; 4. LED bead; 5. Top handle; 6. Side handle; 7. Built-in power supply; 8. First LED bead area; 9. Second LED bead area; 10. Third LED bead area. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0041] In judicial practice, vehicle speed assessment reports are crucial evidence for determining accident liability and convicting individuals. Video footage is the primary source of this evidence, and according to the classic velocity-displacement-time kinematic formula, the time parameter is one of only two variables affecting the calculation results. However, since most video footage is roadside video, the assessor cannot obtain the relevant technical parameters of the cameras, and the video footage often exhibits abnormal frame rates. For example, in one specific case, the video showed 15 to 17 frames per second based on the image display time; however, the file properties indicated a frame rate of 29 fps. In judicial vehicle speed assessments, it is necessary to determine the actual inter-frame time interval of the video to select accurate parameters for calculating vehicle speed. In this case, a reliable inter-frame time interval could not be obtained from the known time information.

[0042] To solve the above technical problems, refer to Figure 1 and Figure 2 This utility model provides a video inter-frame time interval verification device, comprising:

[0043] Box 3, the front of which is provided with a lamp bead installation area;

[0044] LED chip assemblies, installed in the LED chip mounting area according to functional zones, include:

[0045] First LED bead area 8, the first LED bead area 8 is provided with a first group of LED beads, the first group of LED beads is connected to a first control signal;

[0046] The second LED bead area 9 is provided with a second group of LED beads, and the second group of LED beads is connected to a second control signal;

[0047] The third LED bead area 10 is provided with a third group of LED beads, and the third group of LED beads is connected to a third control signal;

[0048] The controller outputs the first control signal, the second control signal, and the third control signal.

[0049] Specifically, in this embodiment of the invention, a controller outputs independent and precisely timed control signals to the three LED bead areas, enabling synchronous video capture by deploying equipment at the accident scene or monitoring area. When the video exhibits an abnormal frame rate, the visible light signal sequence formed by the LED bead group in the video frame will deviate quantifiablely from the theoretical timing sequence. By analyzing the correspondence between the captured LED bead 4 state changes and the actual control signals, the actual time interval between each frame can be directly calculated, while identifying abnormal locations such as frame skipping and stuttering. This design avoids dependence on camera technical parameters and video file metadata, achieving physical layer calibration of the original video stream time reference, and providing an objective and traceable time calibration basis for vehicle speed identification.

[0050] In a preferred embodiment of this utility model, the LED beads 4, controller, and built-in power supply 7 of the calibration equipment are all integrated within the housing 3, achieving a high degree of integration of the calibration equipment.

[0051] In a preferred embodiment of this utility model, the LED bead 4 is an RGB LED bead with a diameter of 88mm, a suitable size. This design has multiple advantages: First, the 88mm diameter ensures that within typical road monitoring inspection distances (5 to 20 meters), the LED bead 4 can form a sufficiently large and clear light spot in the video image, significantly improving its recognition and anti-interference capabilities under complex lighting conditions (such as backlight, rain, and night) or long-distance shooting conditions, effectively overcoming the problem that traditional small timing screens (such as mobile phone screens) are difficult to capture clearly at long distances or in backlight; second, the RGB LED bead gives the device powerful color expression capabilities, enabling the color change recording function of the third LED bead area 10 to be realized, clearly distinguishing the number of cycles; third, the combination of large size and high brightness makes the light signal coverage of the LED bead 4 wide and its penetration strong, so that it can be stably and accurately recorded by the road monitoring camera even at a distance of 20 meters, meeting the inspection needs of most road monitoring installation heights. Therefore, the selection of 88mm RGB LEDs perfectly meets the stringent requirements of road accident scene investigation for equipment visibility, environmental adaptability, and reliability, providing a solid physical foundation for high-precision inter-frame time interval verification.

[0052] As a preferred embodiment of this utility model, refer to Figure 3 The first group of LED beads consists of three green LED beads, which are arranged longitudinally at equal intervals on the left side of the LED bead installation area.

[0053] The second group of LEDs consists of six red LEDs arranged in a matrix at equal intervals in the lower right area of ​​the LED installation area;

[0054] The third group of LED beads consists of two composite color LED beads, which are arranged horizontally in the upper right area of ​​the LED bead installation area;

[0055] The spatial distribution of the three groups of LED beads is as follows:

[0056] In the horizontal direction, the first group of LED beads is located to the left of the second group of LED beads and the third group of LED beads;

[0057] In the vertical direction, the second group of LED beads is located directly below the third group of LED beads, the bottom of the second group of LED beads is flush with the bottom of the first group of LED beads, and the top of the third group of LED beads is flush with the top of the first group of LED beads.

[0058] In a preferred embodiment of this utility model, the verification device is equipped with three independent controllers, which respectively output the first control signal, the second control signal and the third control signal to control the LED beads 4 to operate collaboratively according to preset rules.

[0059] The first control signal is a first timing pulse signal that drives the first group of LED beads to light up sequentially according to the target frame rate mode; the second control signal is a second timing pulse signal that drives the second group of LED beads to light up cyclically at a fixed 10ms interval; the third control signal is a composite level signal that drives the third group of LED beads to trigger color switching when the second group of LED beads completes two cycles of lighting.

[0060] The third group of LEDs supports five color changes: red (R), green (G), blue (B), yellow (R+G), and cyan (G+B). The third group of LEDs changes color once after the second group completes two full cycles of illumination. Therefore, the operating conditions of the third group of LEDs are as follows:

[0061] When the first cycle of the six red LEDs ends, the first composite color LED lights up. When the second cycle of the six red LEDs ends, the second composite color LED lights up. Two cycles correspond to one period, and each period can be calculated as a 120ms time interval.

[0062] Specifically, in this embodiment of the present invention, the logic for lighting up the LEDs 4 of the verification device is as follows: Based on the synchronous startup phase (i.e., the first green LED in the first LED area 8, the first composite color LED in the third LED area 10, and the first red LED in the second LED area 9 are lit up simultaneously), the three green LEDs in the first LED area 8 are lit up in a loop from top to bottom according to the target frame rate to expose video frame skipping anomalies. The six red LEDs in the second LED area 9 are lit up in a loop at a fixed 10ms interval to form a millisecond-level time scale, where a single loop is 60ms. The two RGBW LEDs in the third LED area 10 mark the number of loops in the second LED area by switching colors every 120ms. The color change is: R→G→B→R+G→G+B, and the 5-color cycle is 600ms.

[0063] More specifically, in the embodiments of this utility model, referring to Figure 4-6 The three controllers follow the parallel and time-sharing drive logic shown in the diagram, and achieve independent control of multiple regions through precise time-slice division and coordination protocol, as detailed below:

[0064] Controller 1: Responsible for driving the green LED group in the first LED area 8.

[0065] During operation, timing pulses are generated strictly according to the preset frame rate mode, and designated green LED beads are lit sequentially within a continuous time period. For example, green LED bead A1 is lit at t0, green LED bead A2 is lit at t0+40ms, and green LED bead A3 is lit at t0+80ms, forming a uniformly moving light spot sequence.

[0066] Controller 2: Independently controls the red LEDs in the second LED area 9, serving as the core time scale. It uses an ultra-high precision clock source to drive the red LEDs to light up periodically, and its operating timing is shown in the diagram.

[0067] Each cycle is 60ms (e.g., [0-60ms], [61-120ms], etc.). Within one cycle, each red LED bead is on for 10ms and off for 50ms. For example, red LED bead B1 is on during [0-10] and off during [11-60], generating a stable, high-frequency flashing reference signal.

[0068] It strictly avoids overlapping with other controller periods, such as the red LED lighting period [0-10] being completely independent of the red LED lighting period [0-30] of controller 1.

[0069] Controller 3: Dedicated to controlling the RGBW lights in the third LED area 10, and records the number of cycles in the second LED area 9 by switching colors.

[0070] During operation, the counting unit is based on the 60ms cycle of the second LED area 9. The color state changes every two cycles (120ms), such as [0-120ms] red → [121-240ms] green → [241-360ms] blue → [361-480ms] yellow → [481-600ms] cyan, etc. The color switching is strictly aligned with the boundary of the red LED cycle to ensure that there is no cumulative error in the cycle count recording.

[0071] This architecture ensures that the three signals maintain nanosecond-level timing accuracy even in complex environments through physically separated controllers, non-overlapping time slice allocation, and strictly synchronized clocks.

[0072] In a preferred embodiment of this utility model, to meet the needs of adapting to multiple frame rates in different road monitoring videos, the lights of the verification device have a function to switch between multiple frame rate modes. The target frame rate is divided into eight frame rate modes: 5fps (200ms), 12fps (83.33ms), 15fps (66.66ms), 18fps (55.44ms), 20fps (50ms), 25fps (40ms), 30fps (33.33ms), and 36fps (27.77ms). These frame rate modes almost cover the mainstream and common historical frame rate specifications currently used in domestic and international road monitoring systems. The control system can precisely drive the first LED bead area 8 to light up sequentially according to the selected target frame rate mode with a single click, as needed. For example, if it is suspected that a monitoring video is labeled as 25fps but actually has an abnormal frame rate, the operator can set the device to run in 25fps mode. At this time, the LED beads 4 in the first LED bead area 8 will light up sequentially at theoretically strict equal time intervals, forming a sequence of light spots moving at a expected uniform speed in the video. In the subsequent analysis of the video, the actual movement trajectory of the recorded light spot was observed:

[0073] If the light spots move at a strictly uniform speed and the spacing is uniform, it indicates that the video recording interval in this segment is stable and meets the preset frame rate.

[0074] If the position of the light spot jumps, stops, or the spacing varies, it directly reveals that the video has frame skipping, stuttering, or frame interval fluctuations.

[0075] By accurately measuring the difference in the number of frames the light spot actually moves, the true inter-frame time interval of each segment (or each abnormal point) and its deviation from the theoretical value can be quantitatively calculated.

[0076] In a preferred embodiment of this invention, to significantly improve the reliability of the device in the most challenging backlight environments (such as sunrise and sunset, and strong direct sunlight on the lens), a reflector is provided around the LED bead 4, with its opening flush with the surface of the housing 3. This reflector can employ a deeply optimized curved geometry and high-reflectivity materials, such as mirror aluminum or vacuum-coated surfaces.

[0077] In a preferred embodiment of this utility model, the back of the housing 3 is provided with a power supply compartment and a movable cover for covering the power supply compartment. The power supply compartment is equipped with a built-in power supply 7. The built-in power supply 7 is a removable battery with a capacity of 83Wh, which is electrically connected to the LED group and the controller through wires.

[0078] Specifically, in this embodiment of the invention, the movable cover can be reliably connected to the housing 3 via quick-release buckles, etc. When opened, it fully exposes the power supply compartment, allowing operators to quickly replace or remove the built-in power supply 7 without tools or complex procedures. This solves the power supply continuity problem during continuous on-site operations, and is particularly suitable for long-term surveys or multi-point mobile testing needs. Simultaneously, when closed, the movable cover and housing 3 form a tight seal, effectively isolating the equipment from rainwater splashes, dust intrusion, and accidental collisions, providing robust protection for the internal power supply 7 and ensuring stable operation of the equipment in harsh weather or complex road conditions. This design, which balances rapid maintenance with robust protection, significantly improves the flexibility and reliability of the equipment deployment at real accident sites, providing a solid physical guarantee for the uninterrupted generation of high-precision time reference signals.

[0079] More specifically, in this embodiment of the invention, the detachable nature of the built-in power supply 7 allows operators to quickly carry a spare battery for on-site hot-swapping, effectively addressing range anxiety in remote areas or scenarios without external power. Simultaneously, the 83Wh capacity strictly complies with the International Air Transport Association (IATA)'s upper limit requirements for lithium batteries in portable electronic devices (typically ≤100Wh), ensuring the device can be carried on civil flights without obstacles by forensic personnel, meeting the emergency investigation needs of major cross-regional accidents. This high-capacity, scalable, and compliant power supply design provides uninterrupted, high-precision time calibration capabilities for complex accident scenes, a key guarantee for the continuity and reliability of judicial evidence collection.

[0080] In a preferred embodiment of this utility model, a function button 2 and a display screen 1 are installed on the side of the housing 3; the function button 2 and the display screen 1 are electrically connected to the controller; the function button 2 includes a start button, a stop button, a confirmation button and a mode selection button; the display screen 1 is used to display the target frame rate mode currently in operation.

[0081] Specifically, in this embodiment of the invention, the function buttons 2 integrated on the side of the housing 3 and the display screen 1 constitute the core human-machine interface for on-site operation, effectively realizing the visualization of equipment status and one-click parameter control. The start button instantly triggers the coordinated operation of the three area light groups, the stop button precisely freezes the current light signal state for video capture, the mode selection button quickly switches between eight preset target frame rates, and the confirmation button locks the final command for critical operations. Operators can quickly complete equipment deployment and parameter settings in complex accident scenes using intuitive physical buttons. Simultaneously, the display screen 1 clearly displays the currently active target frame rate mode in real time, providing operators with crucial visual confirmation and effectively avoiding mode setting errors caused by noisy environments or rushed operations. This "what you see is what you set, one-click response" interactive design significantly improves the efficiency and reliability of on-site equipment operation, enabling non-professionals to quickly and accurately initiate the frame rate verification process during emergency investigations, ensuring that the generated optical time reference signal strictly matches the expected frame rate of the video under inspection, providing an unambiguous original data foundation for subsequent forensic identification.

[0082] In a preferred embodiment of this utility model, the housing 3 is made of aluminum alloy and has external dimensions of 470mm × 370mm × 135mm. This aluminum alloy material gives the housing 3 excellent wear resistance, effectively resisting common scratches, collisions, and rough handling during inspections; its superior compressive strength ensures that the internal precision electronic components (such as controllers) and large-size LED beads 4 are not damaged during vehicle transport, on-site stacking, or accidental compression.

[0083] In a preferred embodiment of this utility model, a top handle 5 is fixedly installed on the top of the box 3, and side handles 6 are fixedly installed on the left and right sides, which can be quickly moved according to the needs of the test scenario.

[0084] In summary, this utility model provides a video inter-frame time interval verification device. Through innovative integration of a high-precision active-emitting time reference source, a multi-region collaborative optical coding mechanism, and an engineering design adapted to harsh on-site environments, it effectively solves the high-precision, quantitative detection problem of abnormal frame rates in road monitoring videos (such as frame skipping, stuttering, and timestamp distortion). Its core features include: using a first LED bead area 8, which can be preset with multiple frame rate modes, to generate a uniformly moving light spot sequence as a theoretical benchmark for inter-frame intervals; using a second LED bead area 9 to provide an absolute time reference with red lights flashing at fixed high-precision intervals; using the color change of a third LED bead area 10 to record the number of cycles for long-term calibration; and ensuring nanosecond-level timing accuracy for multi-channel signal collaborative operation through three independent, synchronous controllers. With the addition of large-size RGB LED beads 4, an anti-backlight reflector, an aluminum alloy protective housing 3, convenient human-machine interaction, and a detachable built-in power supply 7, this verification device can be quickly deployed and generate clear, stable, and interference-resistant optical "time fingerprints" under typical road accident scene conditions such as complex lighting, severe weather, long distances (5-20 meters), and narrow spaces. This calibration device provides an objective, quantifiable, and traceable time-domain calibration benchmark for video-based vehicle speed forensic identification. It overcomes the limitations and ambiguities of traditional methods that rely on video-borne metadata or natural reference objects, significantly improving the accuracy, reliability, and judicial evidentiary value of the identification results, thus filling a gap in the industry.

[0085] Specifically, taking mode 1—5fps as an example:

[0086] Display 1 shows 5fps. Press the confirmation button on function button 2 to start running.

[0087] At this time, the first green LED in the first LED area 8, the first composite color LED in the third LED area 10, and the first red LED in the second LED area 9 are lit up simultaneously. The green LEDs are lit up sequentially from top to bottom at 5fps (similar to a running light flashing), and the red LEDs are lit up sequentially from left to right and from top to bottom at 10ms (similar to a running light flashing). The time interval between the red LEDs is fixed at 10ms.

[0088] The operating conditions of composite color LEDs are as follows.

[0089] When the red LED bead completes the first lap, the first composite color LED bead lights up (R lights up). When it completes the second lap, the first composite color LED bead turns off, and the second composite color LED bead lights up (R lights up). Two laps correspond to one cycle.

[0090] When the red LED bead runs for the third lap, the first composite color LED bead lights up (G lights up). When it runs for the fourth lap, the first composite color LED bead turns off, and the second composite color LED bead lights up (G lights up); two laps correspond to one cycle.

[0091] When the red LED bead completes its 5th lap, the first composite color LED bead lights up (B lights up). When it completes its 6th lap, the first composite color LED bead turns off, and the second composite color LED bead lights up (B lights up). Two laps correspond to one cycle.

[0092] When the red LED bead completes the 7th lap, the first composite color LED bead lights up (R+G lights up). When it completes the 8th lap, the first composite color LED bead turns off, and the second composite color LED bead lights up (R+G lights up); 2 laps correspond to one cycle.

[0093] When the red LED bead completes the 9th lap, the first composite color LED bead lights up (G+B lights up). When it completes the 10th lap, the first composite color LED bead turns off, and the second composite color LED bead lights up (G+B lights up); two laps correspond to one cycle.

[0094] The other modes are the same as mode 1, except for the fps value. The operating status of red LEDs and composite color LEDs remains unchanged.

[0095] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A video inter-frame time interval verification apparatus characterized by, include: The housing has a lamp bead mounting area on its front side; LED chip assemblies, installed in the LED chip mounting area according to functional zones, include: The first LED bead area is provided with a first group of LED beads, and the first group of LED beads is connected to a first control signal; The second LED bead area is provided with a second group of LED beads, and the second group of LED beads is connected to a second control signal; The third LED bead area is provided with a third group of LED beads, and the third group of LED beads is connected to a third control signal; The controller outputs the first control signal, the second control signal, and the third control signal.

2. The video inter-frame time interval verification device according to claim 1, characterized in that, The first group of LED beads are green LED beads, arranged longitudinally at equal intervals on the left side of the LED bead installation area; The second group of LED beads are red LED beads, arranged in a matrix with equal spacing in the lower right area of ​​the LED bead installation area; The third group of LED beads are composite color LED beads, which are arranged horizontally in the upper right area of ​​the LED bead installation area; The spatial distribution of the three groups of LED beads is as follows: In the horizontal direction, the first group of LED beads is located to the left of the second group of LED beads and the third group of LED beads; In the vertical direction, the second group of LED beads is located directly below the third group of LED beads, the bottom of the second group of LED beads is flush with the bottom of the first group of LED beads, and the top of the third group of LED beads is flush with the top of the first group of LED beads.

3. The video inter-frame time interval verification device according to claim 2, characterized in that, The first control signal is a first timing pulse signal that drives the first group of LED beads to light up sequentially according to the target frame rate mode; The second control signal is a second timing pulse signal that drives the second group of LED beads to light up cyclically at fixed time intervals; wherein, the fixed time interval is 10ms; The third control signal is a composite level signal that drives the third group of LED beads to trigger color switching when the second group of LED beads completes two cycles of illumination, and supports multiple color changes, including red (R), green (G), blue (B), yellow (R+G), and cyan (G+B).

4. A video frame interval checking apparatus according to claim 3, wherein, The target frame rate is divided into multiple frame rate modes, including 5fps, 12fps, 15fps, 18fps, 20fps, 25fps, 30fps, and 36fps.

5. The video frame interval verification apparatus of claim 1, wherein, The diameter of the lamp bead is 88mm, and each lamp bead is provided with a reflector around its periphery, with the opening end of the reflector flush with the surface of the housing.

6. The video frame interval verification apparatus of claim 1, wherein, The back of the enclosure is provided with a power supply compartment and a movable cover for covering the power supply compartment, and a built-in power supply is installed inside the power supply compartment.

7. A video inter-frame time interval verification device according to claim 6, characterized in that, The built-in power source is a removable battery with a capacity of 83Wh, which is electrically connected to the LED assembly and the controller via wires.

8. The video frame interval verification apparatus of claim 1, wherein, The side of the enclosure is equipped with function buttons and a display screen, which are electrically connected to the controller. The function buttons include a start button, a stop button, a confirmation button, and a mode selection button.

9. The video frame interval verification apparatus of claim 1, wherein, The enclosure is made of aluminum alloy.

10. The video frame interval verification apparatus of claim 1, wherein, A top handle is fixedly installed on the top of the box, and side handles are fixedly installed on the left and right sides of the box.

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