Projection image detection method used in non-darkroom environment

Abstract

The invention relates to the technical field of projection image detection, in particular to a projection image detection method used in a non-darkroom environment. The gain film is used as a projection receiving plane, so that the projection performance of the projection lamp to be tested can be detected in a non-darkroom environment, and meanwhile, the size of the whole detection device can be greatly reduced. The invention also provides a projection image detection method, which comprises the following steps of: calculating to obtain a projection parameter formed on the gain film by the first projection lamp which is tested to be qualified, marking a projection parameter error range corresponding to the projection parameter on the gain film, and performing projection operation by using the projection lamp to be tested in a non-darkroom environment. If the projection parameter of the projection lamp to be tested on the gain film is within the projection parameter error range, the projection lamp to be tested is a qualified product, and the projection performance of the projection lamp to be tested can be detected in a non-darkroom environment.

Description

[0001] This case is a divisional application based on the invention patent with application date of June 22, 2020, application number CN202010571934.6, and name of a projection image detection device and method. Technical Field

[0002] The present invention relates to the technical field of projection image detection, and in particular to a projection image detection method used in a non-darkroom environment. Background Art

[0003] Various projection lamps such as logo projection lamp, welcome projection lamp, car logo projection lamp, car welcome projection lamp, car welcome light carpet projection lamp, etc. are often used to project brand logo, welcome pattern, advertising information and other content to improve user experience or attract customers.

[0004] At present, the optical performance testing of the above-mentioned various projection lamps at the production and assembly sites is usually equipped with expensive optical darkrooms, which are used to test the optical performance indicators such as the shape, size, brightness, clarity, contrast, gradient, etc. of the projection pattern. Due to the large size, high cost and complicated operation of such optical darkrooms, such optical darkrooms are usually not available at the installation and use sites, and the optical performance and projection effect testing can usually only rely on the visual inspection of the installers. Due to the huge differences in the optical environment at the installation and use sites, the visual judgment of the installers is also subject to great uncertainty, which greatly causes the limitation of the detection and affects the detection accuracy. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a projection image detection device and method which can be used in a non-darkroom environment.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is:

[0007] A projection image detection device is arranged in a non-darkroom environment, comprising a projection lamp to be tested and a gain film, wherein the projection direction of the projection lamp to be tested faces the gain film, and the gain film has preset projection comparison information on one side facing the projection lamp to be tested.

[0008] Another technical solution adopted by the present invention is

[0009] A projection image detection method comprises the following steps:

[0010] S1, obtaining a first projection lamp that has passed the test and corresponds to the projection lamp to be tested, and obtaining projection parameters formed by the first projection lamp on the gain film by calculation;

[0011] S2. Calculate the corresponding projection parameter error range according to the projection parameter of the first projection lamp, and mark the projection parameter error range on the gain film;

[0012] S3. Perform projection operation using the projection lamp to be tested in a non-darkroom environment to determine whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range. If so, the projection lamp to be tested is set as a qualified product.

[0013] The beneficial effects of the present invention are:

[0014] The projection image detection device provided by the present invention uses a gain film as a projection receiving plane, and can detect the projection performance of the projection lamp to be tested in a non-darkroom environment, and at the same time can greatly reduce the volume of the overall detection device. The projection image detection method also provided by the present invention first calculates the projection parameters formed on the gain film by the first projection lamp that has passed the test, and marks the corresponding projection parameter error range on the gain film, and then uses the projection lamp to be tested to perform a projection operation in a non-darkroom environment. If the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range, it means that the projection lamp to be tested is a qualified product, and the projection performance of the projection lamp to be tested can be detected in a non-darkroom environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the projection image detection device of the present invention;

[0016] Figure 2 for Figure 1 The main view;

[0017] Figure 3 is a flowchart of the steps of the projection image detection method of the present invention;

[0018] Figure 4 This is a light path diagram of the projection lamp of the present invention when the gain film is not attached;

[0019] Figure 5 It is a schematic diagram of imaging on a gain film of the present invention;

[0020] Figure 6 It is a schematic diagram of imaging in which the error range of projection parameters is marked on the gain film of the present invention;

[0021] Figure 7 It is a schematic diagram of the coordinate system of the present invention;

[0022] Description of labels:

[0023] 1. Rack; 2. Mounting frame; 3. Projection lamp to be tested; 4. Gain film. DETAILED DESCRIPTION

[0024] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0025] Please refer to Figure 1 A projection image detection device provided by the present invention is set in a non-darkroom environment. The projection image detection device includes a projection lamp to be tested and a gain film. The projection direction of the projection lamp to be tested is toward the gain film, and the gain film has preset projection comparison information on one side facing the projection lamp to be tested.

[0026] From the above description, it can be seen that the beneficial effect of the present invention is that by using the gain film as the projection receiving plane, the projection performance of the projection lamp to be tested can be detected in a non-darkroom environment, and the volume of the overall detection device can be greatly reduced.

[0027] Furthermore, the projection direction of the projection lamp to be tested is perpendicular to the plane where the gain film is located, and the projection area of ​​the projection lamp to be tested on the gain film is set corresponding to the preset projection comparison information.

[0028] It can be seen from the above description that the above structure can make the outline and lines of the projection pattern of the projection lamp to be tested on the gain film clearer, which is convenient for detecting the performance of the projection lamp to be tested.

[0029] Furthermore, the gain multiple of the gain film is more than 7 times.

[0030] From the above description, it can be seen that through a large number of experiments, it can be found that using a gain film with a gain multiple of 7 or more can meet the conditions required for detection in a non-darkroom environment.

[0031] Furthermore, it also includes an image recognizer, and the recognition range of the image recognizer covers a side of the gain film facing the projection lamp to be tested.

[0032] From the above description, it can be known that with the help of the image recognizer, it is possible to quickly determine whether the projection pattern of the projection lamp to be tested on the gain film falls within the preset projection comparison information, thereby quickly knowing whether the projection lamp to be tested is a qualified product.

[0033] Furthermore, it also includes a frame, a mounting seat and a mounting frame respectively arranged on the frame; the mounting seat is used to load the projection lamp to be tested, and the mounting frame is used to load the gain film.

[0034] From the above description, it can be known that the projection lamp to be tested is loaded on the mounting seat on the rack, and the gain film is loaded on the mounting frame on the rack, so that the two maintain a relatively fixed position relationship, which is convenient for detection and the detection accuracy is guaranteed.

[0035] Furthermore, the mounting frame is a flat plate made of acrylic, and the gain film is attached to a side surface of the flat plate facing the projection lamp to be tested.

[0036] From the above description, it can be known that the gain film is attached to the side of the flat plate facing the projector lamp to be tested and the flat plate is made of acrylic, so that the flatness of the gain film is guaranteed and the detection accuracy is ensured.

[0037] See also Figure 2 The present invention also provides a projection image detection method, comprising the following steps:

[0038] S1, obtaining a first projection lamp that has passed the test and corresponds to the projection lamp to be tested, and obtaining projection parameters formed by the first projection lamp on the gain film by calculation;

[0039] S2. Calculate the corresponding projection parameter error range according to the projection parameter of the first projection lamp, and mark the projection parameter error range on the gain film;

[0040] S3. Perform projection operation using the projection lamp to be tested in a non-darkroom environment to determine whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range. If so, the projection lamp to be tested is set as a qualified product.

[0041] From the above description, it can be seen that the beneficial effect of the present invention is that: firstly, the projection parameters formed by the first projection lamp that has passed the test on the gain film are obtained by calculation and the corresponding projection parameter error range is marked on the gain film, and then the projection lamp to be tested is used to perform a projection operation in a non-darkroom environment. If the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range, it means that the projection lamp to be tested is a qualified product, and the projection performance of the projection lamp to be tested can be tested in a non-darkroom environment. The projection performance includes the shape, size, brightness, clarity, contrast and gradient of the projection pattern.

[0042] Furthermore, the projection parameters formed by the first projection lamp on the gain film are obtained by calculation in step S1, specifically:

[0043] A first projection parameter of a first projection lamp on a preset plane parallel to the gain film is obtained, and the projection parameter formed by the first projection lamp on the gain film is calculated according to a spatial projection calculation method.

[0044] It can be seen from the above description that, through the above method, the projection parameters formed by the first projection lamp on the gain film can be theoretically calculated.

[0045] Further, in step S3, it is determined whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range, specifically:

[0046] Taking pictures to obtain an image containing both the projection parameters of the projection lamp to be tested on the gain film and the error range of the projection parameters;

[0047] The projection parameters of the projection lamp to be tested on the gain film and the positions of the projection parameter error range on the image are respectively identified; and based on the positional relationship between the projection parameters of the projection lamp to be tested on the gain film and the projection parameter error range, it is determined whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range.

[0048] It can be seen from the above description that, through the above method, with the help of image recognition technology, it is possible to quickly determine whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range.

[0049] Furthermore, after step S3, the following steps are further included:

[0050] S4. Preset a camera device that has been calibrated with environmental parameters, and use the camera device to collect relevant performance parameters of the projection lamp to be tested.

[0051] It can be seen from the above description that the above method can be used to measure performance parameters such as brightness and contrast of the projection pattern.

[0052] Please refer to Figure 1-7 , Embodiment 1 of the present invention is:

[0053] The present invention provides a projection image detection device, which is arranged in a non-darkroom environment (such as an open environment) where no special control is applied to the surrounding light environment. The projection image detection device includes a projection lamp to be tested and a gain film. The gain multiple of the gain film is more than 7 times, such as the ShowTeX 4860 0220 0553 product which can achieve a gain of more than 9 times within an observation angle of 10°. The projection direction of the projection lamp to be tested is toward the gain film, and the gain film has preset projection comparison information on one side facing the projection lamp to be tested. The preset projection comparison information is formed by calculating the projection parameters formed by the qualified projection lamp on the gain film, and then calculating the corresponding projection parameter error range according to the projection parameters, and marking the projection parameter error range on the gain film;

[0054] The error range of the projection parameters is Figure 6 The range enclosed by the two closed curves marked with c; the projection parameter is Figure 5 The lines marked with b; Figure 4The line labeled a is the light emitted by the projection lamp when no gain film is attached.

[0055] In this embodiment, the projection direction of the projector lamp to be tested is perpendicular to the plane where the gain film is located, and the projection area of ​​the projector lamp to be tested on the gain film is set corresponding to the preset projection comparison information. Through the above structure, the outline and lines of the projection pattern of the projector lamp to be tested on the gain film can be made clearer, which is convenient for detecting the performance of the projector lamp to be tested.

[0056] In order to quickly determine whether the projector lamp to be tested is a qualified product, the projection image detection device further includes an image recognizer, the recognition range of which covers the side of the gain film facing the projector lamp to be tested. With the help of the image recognizer, it is possible to quickly determine whether the projection pattern of the projector lamp to be tested on the gain film falls within the preset projection comparison information, thereby quickly knowing whether the projector lamp to be tested is a qualified product.

[0057] like Figure 1-2 As shown, the projection image detection device also includes a frame 1, a mounting seat and a mounting frame 2 respectively arranged on the frame 1; the mounting seat is used to load the projection lamp 3 to be tested, and the mounting frame 2 is used to load the gain film 4, so that the two maintain a relatively fixed position relationship, which is convenient for detection and the detection accuracy is guaranteed. The mounting frame is a flat plate and the material is acrylic. The gain film is attached to the side surface of the flat plate facing the projection lamp to be tested, so that the plane flatness of the gain film is guaranteed and the detection accuracy is ensured. In addition, the gain film can also be attached to the other side of the flat plate opposite to the side surface facing the projection lamp to be tested to form another plane receiving the projection.

[0058] In this embodiment, the rack is made of an aluminum profile frame in the shape of a rectangular parallelepiped, and the mounting frame is arranged around the aluminum profile frame. The overall volume is 640mm*380mm*350mm (about 0.085m3), and the weight is only about 3kg. The cost is only about 5% of the original solution. Since the receiving screen (that is, the mounting frame) is designed to be close to the projection light source (the projection lamp to be tested), and the gain film has an optical gain effect, it is easier to identify the characteristic pattern using image recognition technology; because the gain film has an optical gain effect that highlights the pattern boundary, it is also possible to directly use visual inspection to determine whether the shape and size of the projection pattern are within the tolerance band, so as to quickly determine whether the projection pattern meets the performance requirements. The observed brightness of this scheme when facing the projection pattern is: projection pattern brightness = projection lamp luminous intensity (cd) * gain of gain film / area of ​​gain film (m 2 ). This solution is more conducive to observation and measurement, and can still maintain sufficient accuracy without using a darkroom.

[0059] Please refer to Figure 3 , Embodiment 2 of the present invention is:

[0060] A projection image detection method comprises the following steps:

[0061] S1, obtaining a first projection lamp that has passed the test and corresponds to the projection lamp to be tested, and obtaining projection parameters formed by the first projection lamp on the gain film by calculation;

[0062] The projection parameters formed by the first projection lamp on the gain film are obtained by calculation in the above step S1, specifically:

[0063] A first projection parameter of a first projection lamp on a preset plane parallel to the gain film is obtained, and the projection parameter formed by the first projection lamp on the gain film is calculated according to a spatial projection calculation formula.

[0064] The above spatial projection calculation formula is as follows:

[0065]

[0066] Among them, Figure 7 As shown, (u 0 , v 0 ) the focus of the imaging plane;

[0067] The world coordinate system is (X W , Y W , Z W );

[0068] The human eye coordinate system is (X E , Y E , Z E );

[0069] The image coordinate system is (x, y) / (u, v);

[0070] S2. Calculate the corresponding projection parameter error range according to the projection parameter of the first projection lamp, and mark the projection parameter error range on the gain film;

[0071] S3. Perform projection operation using the projection lamp to be tested in a non-darkroom environment to determine whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range. If so, the projection lamp to be tested is set as a qualified product.

[0072] In this embodiment, if Figure 4 The figure shows the projection pattern shape when no gain film is used. Figure 5 is the projection parameter of the projector lamp to be tested on the gain film, Figure 6 It is an image that contains both the projection parameters of the projection lamp to be tested on the gain film and the error range of the projection parameters (ie, the tolerance band).

[0073] In the above step S3, it is determined whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range, specifically:

[0074] Taking pictures to obtain an image containing both the projection parameters of the projection lamp to be tested on the gain film and the error range of the projection parameters;

[0075] The projection parameters of the projection lamp to be tested on the gain film and the positions of the projection parameter error range on the image are respectively identified; and based on the positional relationship between the projection parameters of the projection lamp to be tested on the gain film and the projection parameter error range, it is determined whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range.

[0076] After step S3, the following steps are also included:

[0077] S4. Preset a camera device that has been calibrated with environmental parameters, and use the camera device to collect relevant performance parameters of the projection lamp to be tested.

[0078] In summary, the present invention provides a projection image detection device that uses a gain film as a projection receiving plane, which can detect the projection performance of the projection lamp to be tested in a non-darkroom environment, and at the same time can greatly reduce the volume of the overall detection device. The present invention also provides a projection image detection method, which first calculates the projection parameters formed on the gain film by the first projection lamp that has passed the test and marks the corresponding projection parameter error range on the gain film, and then uses the projection lamp to be tested to perform a projection operation in a non-darkroom environment. If the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range, it means that the projection lamp to be tested is a qualified product, and the projection performance of the projection lamp to be tested can be detected in a non-darkroom environment.

[0079] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A projection image detection method used in a non-darkroom environment, characterized in that: The projection image detection device is arranged in a non-darkroom environment, wherein the projection image detection device comprises a projection lamp to be tested and a gain film, wherein the projection direction of the projection lamp to be tested faces the gain film, and a side of the gain film facing the projection lamp to be tested has preset projection comparison information; The projection image detection method comprises the following steps: S1, obtaining a first projection lamp that has passed the test and corresponds to the projection lamp to be tested, and obtaining projection parameters formed by the first projection lamp on the gain film by calculation; S2. Calculate the corresponding projection parameter error range according to the projection parameter of the first projection lamp, and mark the projection parameter error range on the gain film; S3. Perform projection operation using the projection lamp to be tested in a non-darkroom environment to determine whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range. If so, the projection lamp to be tested is set as a qualified product.

2. The projection image detection method used in a non-darkroom environment according to claim 1, characterized in that: The projection direction of the projection lamp to be tested is perpendicular to the plane where the gain film is located, and the projection area of ​​the projection lamp to be tested on the gain film is set corresponding to the preset projection comparison information.

3. The projection image detection method used in a non-darkroom environment according to claim 1, characterized in that: The gain multiple of the gain film is 7 times or more.

4. The projection image detection method used in a non-darkroom environment according to claim 1, characterized in that: The device also includes an image identifier, wherein an identification range of the image identifier covers a side of the gain film facing the projection lamp to be tested.

5. The projection image detection method used in a non-darkroom environment according to claim 1, characterized in that: It also includes a frame, a mounting seat and a mounting frame respectively arranged on the frame; the mounting seat is used to load the projection lamp to be tested, and the mounting frame is used to load the gain film.

6. The projection image detection method used in a non-darkroom environment according to claim 5, characterized in that: The mounting frame is a flat plate made of acrylic, and the gain film is attached to a side surface of the flat plate facing the projection lamp to be tested.

7. The projection image detection method used in a non-darkroom environment according to claim 1, characterized in that: The projection parameters formed by the first projection lamp on the gain film are obtained by calculation in step S1, specifically: A first projection parameter of a first projection lamp on a preset plane parallel to the gain film is obtained, and the projection parameter formed by the first projection lamp on the gain film is calculated according to a spatial projection calculation method.

8. The projection image detection method used in a non-darkroom environment according to claim 1, characterized in that: In step S3, it is determined whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range, specifically: Taking pictures to obtain an image containing both the projection parameters of the projection lamp to be tested on the gain film and the error range of the projection parameters; The projection parameters of the projection lamp to be tested on the gain film and the positions of the projection parameter error range on the image are respectively identified; and based on the positional relationship between the projection parameters of the projection lamp to be tested on the gain film and the projection parameter error range, it is determined whether the projection parameters of the projection lamp to be tested on the gain film are within the projection parameter error range.

9. The projection image detection method used in a non-darkroom environment according to claim 1, characterized in that: After step S3, the following steps are also included: S4. Preset a camera device that has been calibrated with environmental parameters, and use the camera device to collect relevant performance parameters of the projection lamp to be tested.

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