Lamp light spot motion stability test system

Abstract

The invention discloses a lamp light spot motion stability test system, which comprises a projection surface used for bearing light beams projected by a lamp to form light spots, a camera device used for shooting the projection surface, and a controller used for controlling the lamp to move and analyzing the light spot motion stability of the lamp according to images shot by the camera device, under the control of the controller, the lamp controls a light beam to swing by more than 90 degrees to enable a light spot to enter a projection surface, the camera device shoots the shape and position change of the light spot on the projection surface in real time and sends the shape and position change to the controller, and the controller calculates the position of the light spot after identifying that an ideal light spot is formed on the projection surface. And the light spot motion stability of the lamp is judged according to the amplitude of the light spot deviating from the stable position. The light spot movement track on the projection surface is shot by the camera device, the light spot position is calculated after the ideal light spot is recognized, the light spot movement stability of the lamp is automatically judged according to the amplitude of the light spot deviating from the final stable position in the light spot movement process, and the efficiency and the precision are high.

Description

Technical Field

[0001] The present invention relates to the technical field of stage lamps, and more particularly to a lamp spot motion stability testing system. Background Art

[0002] As a stage lighting fixture, stage lights usually project light beams to targets from a long distance, and the light beams often move. Due to the long projection distance, a slight shake of the lamp during rotation will cause a large deviation of the light beam projection spot, so the stability of the lamp movement is relatively high.

[0003] At present, the light spot movement stability test is generally carried out on the lamps before they leave the factory, but the current method is visual inspection, which has large errors and low efficiency. Summary of the invention

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides a lamp spot motion stability testing system, which can automatically perform evaluation with high accuracy and efficiency.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a lamp spot motion smoothness test system, comprising a projection surface for supporting a light spot formed by a light beam projected by the lamp, a camera device for photographing the projection surface, and a controller for controlling the movement of the lamp and analyzing the smoothness of the lamp spot motion according to the image photographed by the camera device. Under the control of the controller, the lamp controls the light beam to swing more than 90° and then allows the light spot to enter the projection surface. The camera device photographs the shape and position changes of the light spot on the projection surface in real time and sends them to the controller. After the controller recognizes that an ideal light spot is formed on the projection surface, it calculates the light spot position and judges the smoothness of the lamp spot motion according to the amplitude of the light spot deviating from its stable position.

[0006] The lamp spot motion smoothness test system uses a camera device to capture the light spot motion trajectory on the projection surface, and starts to calculate the light spot position after identifying the formation of an ideal light spot. The controller automatically determines the lamp spot motion smoothness according to the amplitude of the light spot deviating from its final stable position during the motion process. The system has automated operation, high efficiency, and reduces errors caused by manual operation.

[0007] Furthermore, the ideal light spot refers to a complete light spot formed on the projection surface, and the light spot distortion is less than a first preset threshold value. That is, before the light spot completely enters the projection surface or the distortion on the projection surface is too large (the center line of the light beam deviates too much from the vertical position of the projection surface), the light spot position calculation is not performed temporarily, and only pattern recognition is performed to save computing power.

[0008] Furthermore, the light beam is conical or cylindrical, and when the center line of the light beam is perpendicular to the projection surface, the light spot formed is circular. The light spot position of the circular light spot is easy to calculate, and the shape is easy to identify. In addition, general lamps have white circles, so the white circle can be used to form a circular light spot when the center line of the light beam is perpendicular to the projection surface.

[0009] Furthermore, the minimum circumscribed circle radius R1 and the maximum inscribed circle radius R2 of the light spot are calculated, and d = (R1-R2) / R1 is used to represent the integrity and distortion of the light spot. That is, when the minimum circumscribed circle and the maximum inscribed circle of the light spot are almost coincident, the light spot is considered to be complete and less distorted.

[0010] Furthermore, the first preset threshold is less than 0.1.

[0011] Furthermore, the spot position is based on the center position of the spot, which is easy to calculate and is less affected by the distortion of the spot.

[0012] Furthermore, the amplitude of the light spot's position deviating from its stable position when the light spot first turns after entering the projection surface is taken as the maximum amplitude of the light spot, and the stability of the light spot movement of the lamp is judged by the maximum amplitude. This position is directly taken as the farthest point where the light spot deviates from the stable position, so as to judge the stability of the light spot movement quickly.

[0013] Furthermore, the magnitude of the light spot deviation from its stable position is expressed as and ,in is the stable position of the light spot, Indicates the real-time position of the light spot, and , ,Will As the maximum amplitude of the light spot, the maximum amplitude is used to judge the stability of the light spot movement of the lamp. After the ideal light spot is formed, the entire movement process of the light spot is comprehensively considered to judge the distance it deviates from the stable position, avoiding the interference of unexpected factors as much as possible, and the result is more accurate.

[0014] Furthermore, the stable position of the light spot is based on the average position of the spot when the light spot position fluctuation is less than or equal to the second preset threshold value. The calculation of the stable position is more accurate based on the average position, or the calculation is simple based on the light spot position that is separated by a third preset threshold value after the controller recognizes that an ideal light spot is formed on the projection surface.

[0015] Furthermore, the second preset threshold is less than or equal to 0.1 mm, which meets the general lamp's requirement for slight jitter when the light spot is stable, and the third preset threshold is greater than or equal to 5 s, which meets the time required for the light spot of a general lamp to reach stability.

[0016] Furthermore, the stabilization time for the light spot to stabilize at the stable position is calculated, and the stability of the light spot movement of the lamp is judged according to the light spot amplitude and the stabilization time. That is, the light spot movement stability is qualified only when it does not deviate far from the stable position during the movement and can quickly stabilize at the stable position.

[0017] Furthermore, the camera device takes an original image of the projection surface before the light spot enters the projection surface, compares the actual image taken after the light spot enters the projection surface with the original image, and obtains the light spot image after removing the background. The interference information in the background can be effectively removed to better identify the light spot.

[0018] Furthermore, the image containing the light spot is converted to the HSV space, the maximum and minimum pixel values ​​of the three channels H, S, and V are calculated respectively, the channel with the largest difference between the maximum and minimum pixel values ​​is selected as the grayscale image of the original RGB image, and the grayscale image is binarized according to the fourth preset threshold value to obtain a binary image of the light spot. Selecting the channel with the largest difference between the maximum and minimum pixel values ​​as the grayscale image of the original RGB image can better identify the light spot, and after binarizing the grayscale image, the light spot can be sharper and the calculation of the light spot position can be more accurate.

[0019] Furthermore, the lamp includes a lamp head for emitting a light beam and a support arm for supporting the lamp head to rotate around a horizontal axis, and the controller controls the lamp head to rotate around the horizontal axis to perform a stability test, that is, the light spot moves vertically on the projection surface to detect the stability of the movement of the lamp head when rotating around the horizontal axis.

[0020] Furthermore, under the control of the controller, the lamp controls the light beam to swing 150°-250° and then the light spot enters the projection surface. The movement amplitude of the lamp is large enough to simulate the daily use scenario and judge the stability of its light spot movement, which is closer to reality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the lamp spot motion stability test system of the present invention.

[0022] Figure 2 It is a schematic diagram of the working process of the lamp spot motion stability testing system of the present invention.

[0023] Figure 3 It is a schematic diagram of the light spot motion state of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the lamp of the present invention. DETAILED DESCRIPTION

[0025] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0026] like Figures 1 to 4 The present invention provides a lamp spot motion smoothness test system, comprising a projection surface for supporting a light spot formed by a light beam projected by the lamp, a camera device for photographing the projection surface, and a controller for controlling the movement of the lamp and analyzing the lamp spot motion smoothness according to the image photographed by the camera device. Under the control of the controller, the lamp controls the light beam to swing more than 90° so that the light spot enters the projection surface. The camera device photographs the shape and position changes of the light spot on the projection surface in real time and sends them to the controller. After the controller recognizes that an ideal light spot is formed on the projection surface, the light spot position is calculated, and the lamp spot motion smoothness is judged according to the amplitude of the light spot deviating from its stable position.

[0027] The lamp spot motion smoothness test system uses a camera device to capture the light spot motion trajectory on the projection surface, and starts to calculate the light spot position after identifying the formation of an ideal light spot. The controller automatically determines the lamp spot motion smoothness according to the amplitude of the light spot deviating from its final stable position during the motion process. The system has automated operation, high efficiency, and reduces errors caused by manual operation.

[0028] The ideal light spot means that as the lamp moves, the light spot on the projection surface gradually changes until it meets specific requirements. Generally speaking, the ideal light spot can accurately identify the real position of the light spot.

[0029] In a preferred embodiment of the present invention, the ideal light spot refers to a complete light spot formed on the projection surface, and the light spot distortion is less than a first preset threshold value. That is, before the light spot completely enters the projection surface or when the distortion on the projection surface is too large (the center line of the light beam deviates too much from the vertical position of the projection surface), the light spot position calculation is not performed temporarily, and only pattern recognition is performed to save computing power.

[0030] Since the shape of the complete light spot formed when the center line of the light beam is perpendicular to the projection surface is known (usually the shape of the final complete light spot can be known based on the control instructions of the lamp), the actual image of the light spot can be compared with it to determine whether the light spot is complete and the degree of distortion.

[0031] The complete light spot formed when the center line of the light beam is perpendicular to the projection surface can be of any shape as long as the position of the light spot can be tracked and calculated.

[0032] In a preferred embodiment of the present invention, the light beam is conical or cylindrical, and when the center line of the light beam is perpendicular to the projection surface, the light spot formed is circular. The light spot position of the circular light spot is easy to calculate, for example, by fitting the edge of the light spot into a circle or an ellipse, its expression equation can be obtained to calculate the light spot position, and the circular shape is easy to identify to confirm whether the light spot has completely entered the projection surface. In addition, general lamps have white circles, so the white circle can be used to form a circular light spot when the center line of the light beam is perpendicular to the projection surface.

[0033] If the complete light spot formed when the center line of the light beam is perpendicular to the projection surface is in other shapes, then the corresponding shape fitting formula can be used to obtain its expression equation, thereby calculating the light spot position.

[0034] In a preferred embodiment of the present invention, the minimum circumscribed circle radius R1 and the maximum inscribed circle radius R2 of the light spot are calculated, and d=(R1-R2) / R1 is used to represent the integrity and distortion of the light spot. That is, when the minimum circumscribed circle and the maximum inscribed circle of the light spot are almost coincident, the light spot is considered to be complete and less distorted.

[0035] In a preferred embodiment of the present invention, the first preset threshold is less than 0.1 When the light spot just enters the projection surface, the shape of the light spot on the projection surface is a distorted minor arc (such as Figure 2 As the light spot continues to enter the projection surface, the shape of the light spot on the projection surface is a distorted semicircle (such as Figure 2 The light spot continues to move, and the distorted major arc is obtained. The light spot continues to move, and the shape of the light spot on the projection surface becomes an ellipse (that is, a circle with greater distortion) (such as Figure 2 Bottom), the light spot continues to move close to the stable position, the light spot distortion will become smaller and smaller, and the shape will become closer and closer to a circle. When the light spot continues to move beyond the stable position, the light spot will become an ellipse again, and the distortion will gradually increase until it moves to the extreme position, returns to the stable position again, and oscillates near the stable position.

[0036] In a preferred embodiment of the present invention, the spot position is based on the center position of the spot. The center position is easy to calculate and is less affected by the distortion of the spot. Regardless of the shape of the spot formed when the center line of the light beam is perpendicular to the projection surface, the center position of the spot can be used as the spot position. When it is a circle, the spot position is the center position of the circle.

[0037] In a preferred embodiment of the present invention, the amplitude of the light spot's position deviating from its stable position when the light spot first turns and moves after entering the projection surface is taken as the maximum amplitude of the light spot, and the stability of the light spot movement of the lamp is judged by the maximum amplitude. This position is directly taken as the farthest point that the light spot deviates from the stable position, so as to judge the stability of the light spot movement quickly.

[0038] Generally speaking, the stable position of the light spot is located in the middle of the projection surface in the moving direction of the light spot, so as to provide enough moving space for the light spot.

[0039] In a preferred embodiment of the present invention, the magnitude of the light spot deviation from its stable position is expressed as and ,in is the stable position of the light spot, Indicates the real-time position of the light spot, and , ,Will As the maximum amplitude of the light spot, the maximum amplitude is used to judge the stability of the light spot movement of the lamp. After the ideal light spot is formed, the entire movement process of the light spot is comprehensively considered to judge the distance it deviates from the stable position, avoiding the interference of unexpected factors as much as possible, and the result is more accurate.

[0040] In a preferred embodiment of the present invention, the stable position of the light spot is based on the average position of the spot when the light spot position fluctuation is less than or equal to a second preset threshold value. The calculation of the stable position is more accurate based on the average position, or the calculation is simple based on the light spot position at a third preset threshold value after the controller recognizes that an ideal light spot is formed on the projection surface.

[0041] The spot position fluctuation refers to the distance between the farthest points on both sides of the stable position.

[0042] In a preferred embodiment of the present invention, the second preset threshold is less than or equal to 0.1 mm, which meets the general lamp's requirement for slight jitter when the light spot is stable, and the third preset threshold is greater than or equal to 5s, which meets the time required for the light spot of a general lamp to reach stability.

[0043] Preferably, the stable position of the light spot is based on the average position of the light spot when the light spot position fluctuation is less than 0.05 mm, specifically 0.01 mm.

[0044] Preferably, the stable position of the light spot is based on the light spot position after the controller recognizes that an ideal light spot is formed on the projection surface for more than 6 seconds, specifically 7 seconds.

[0045] In a preferred embodiment of the present invention, the stabilization time taken for the light spot to stabilize at a stable position is calculated, and the light spot motion stability of the lamp is determined based on the light spot amplitude and the stabilization time taken. That is, the light spot motion stability is considered qualified only when the light spot does not deviate far from the stable position during the motion process and can quickly stabilize at the stable position.

[0046] Preferably, the stabilization time needs to be less than or equal to 5 seconds, and further less than or equal to 3 seconds.

[0047] In a preferred embodiment of the present invention, the camera device takes an original image of the projection surface before the light spot enters the projection surface, compares the actual image after the light spot enters the projection surface with the original image, and obtains the light spot image after removing the background. The interference information in the background can be effectively removed to better identify the light spot. Using two pictures to compare and remove the background belongs to the prior art and will not be described in detail here.

[0048] In a preferred embodiment of the present invention, the image containing the light spot is converted to the HSV space, the maximum and minimum pixel values ​​of the three channels H, S, and V are calculated respectively, the channel with the largest difference between the maximum and minimum pixel values ​​is selected as the grayscale image of the original RGB image, and the grayscale image is binarized according to the fourth preset threshold value to obtain a binary image of the light spot. Selecting the channel with the largest difference between the maximum and minimum pixel values ​​as the grayscale image of the original RGB image can better identify the light spot, and after binarizing the grayscale image, the light spot can be sharper and the calculation of the light spot position can be more accurate.

[0049] Preferably, the fourth preset threshold is greater than or equal to 170, specifically 200.

[0050] In a preferred embodiment of the present invention, the lamp includes a lamp head for emitting a light beam and a support arm for supporting the lamp head to rotate around a horizontal axis, and the controller controls the lamp head to rotate around the horizontal axis to perform a stability test, that is, the light spot moves vertically on the projection surface to detect the stability of the movement of the lamp head when rotating around the horizontal axis.

[0051] Of course, a chassis for supporting the support arm to rotate around the vertical axis may also be included, and the support arm and the lamp head may be rotated around the vertical axis as a whole to detect the stability of the movement of the lamp head when rotating around the vertical axis. In a preferred embodiment of the present invention, the lamp, under the control of the controller, controls the light beam to swing 150°-250° and then allows the light spot to enter the projection surface. The movement amplitude of the lamp is large enough to simulate the daily use scenario and judge the stability of its light spot movement, which is closer to reality.

[0052] Preferably, under the control of the controller, the lamp controls the light beam to swing 180°-225° so that the light spot enters the projection surface, specifically 200°.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A lamp spot motion stability test system, characterized in that: The invention comprises a projection surface for supporting a light spot formed by a light beam projected by a lamp, a camera for photographing the projection surface, and a controller for controlling the movement of the lamp and analyzing the smoothness of the movement of the light spot of the lamp according to the image photographed by the camera. Under the control of the controller, the lamp controls the light beam to swing more than 90° so that the light spot enters the projection surface. The camera photographs the shape and position changes of the light spot on the projection surface in real time and sends the photos to the controller. After the controller recognizes that an ideal light spot is formed on the projection surface, the light spot position is calculated, and the smoothness of the movement of the light spot of the lamp is judged according to the amplitude of the light spot deviating from its stable position.

2. The lamp spot motion stability test system according to claim 1, characterized in that: The ideal light spot refers to a complete light spot formed on the projection surface, and the light spot distortion is less than a first preset threshold.

3. The lamp spot motion stability test system according to claim 2, characterized in that: The light beam is conical or cylindrical, and when the center line of the light beam is perpendicular to the projection surface, the formed light spot is circular.

4. The lamp spot motion stability testing system according to claim 3, characterized in that: Calculate the minimum circumscribed circle radius R1 and the maximum inscribed circle radius R2 of the light spot, and use d= (R1-R2) / R1 to represent the integrity and distortion of the light spot.

5. The lamp spot motion stability test system according to claim 4, characterized in that: The first preset threshold is less than 0.

1.

6. The lamp spot motion stability test system according to any one of claims 1 to 3, characterized in that: The spot position is based on the center of the spot.

7. The lamp spot motion stability test system according to claim 1, characterized in that: After the light spot enters the projection surface, the amplitude of the light spot's position deviating from its stable position during the first turning movement is taken as the maximum amplitude of the light spot, and the stability of the light spot movement of the lamp is judged by the maximum amplitude.

8. The lamp spot motion stability test system according to claim 1, characterized in that: The magnitude of the light spot's deviation from its stable position is expressed as and ,in is the stable position of the light spot, Indicates the real-time position of the light spot, and , ,Will The maximum amplitude of the light spot is used as the maximum amplitude of the light spot, and the stability of the light spot movement of the lamp is judged by the maximum amplitude.

9. The lamp spot motion stability test system according to claim 1, 7 or 8, characterized in that: The stable position of the light spot is based on the average position of the light spot when the light spot position fluctuation is less than or equal to the second preset threshold, or based on the light spot position at an interval of a third preset threshold after the controller recognizes that an ideal light spot is formed on the projection surface.

10. The lamp spot motion stability test system according to claim 9, characterized in that: The second preset threshold is less than or equal to 0.1 mm, and the third preset threshold is greater than or equal to 5 s.

11. The lamp spot motion stability test system according to claim 1, characterized in that: Calculate the time it takes for the light spot to stabilize at a stable position, and judge the stability of the light spot movement based on the light spot amplitude and the stabilization time.

12. The lamp spot motion stability test system according to claim 1, characterized in that: The camera device takes an original image of the projection surface before the light spot enters the projection surface, compares the actual image taken after the light spot enters the projection surface with the original image, and obtains the light spot image after removing the background.

13. The lamp spot motion stability test system according to claim 1 or 12, characterized in that: The image containing the light spot is converted to the HSV space, and the maximum and minimum pixel values ​​of the three channels H, S, and V are calculated respectively. The channel with the largest difference between the maximum and minimum pixel values ​​is selected as the grayscale image of the original RGB image, and the grayscale image is binarized according to the fourth preset threshold to obtain a binary image of the light spot.

14. The lamp spot motion stability testing system according to claim 1, characterized in that: The lamp comprises a lamp head for emitting a light beam and a support arm for supporting the lamp head to rotate around a horizontal axis, and the controller controls the lamp head to rotate around the horizontal axis to perform a stable test.

15. The lamp spot motion stability testing system according to claim 1, characterized in that: The lamp, under the control of the controller, controls the light beam to swing 150°-250° so that the light spot enters the projection surface.

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