CN113375909A - Speckle measurement method and device based on auxiliary focusing of image edge detection - Google Patents
Speckle measurement method and device based on auxiliary focusing of image edge detection Download PDFInfo
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Abstract
The invention provides a speckle measurement method and a device based on picture edge detection auxiliary focusing, wherein the method comprises the following steps: image acquisition is carried out through a camera, a shot picture is intercepted, edge detection auxiliary focusing of the intercepted picture is carried out, and speckle measurement work is carried out when the clear contrast of the intercepted picture reaches the maximum; setting exposure time, wherein the exposure time is set to be integral multiple of the frame frequency of the laser display equipment; controlling a steering engine to rotate a steering engine turntable to switch the optical filter for time-delay shooting; and after shooting is finished, intercepting and calculating the shot speckle picture to obtain the speckle contrast. The invention assists focusing based on picture edge detection, is used for measuring the speckle degree of the laser display equipment, and is more accurate and scientific than the method for measuring the speckle degree of the laser display equipment by auxiliary focusing observed by human eyes.
Description
Technical Field
The invention relates to the technical field of laser display speckle measurement, in particular to a speckle measurement method and device based on picture edge detection auxiliary focusing.
Background
Laser television has now gradually entered the ordinary family, and when the laser light reaches the rough screen surface, a granular pattern, called speckle, occurs that strongly affects the image. The speckle phenomenon of the laser display equipment cannot be completely eliminated due to the high coherence of laser, the contrast and the resolution of an image are greatly reduced, the actual appearance of a user is influenced if the speckle phenomenon is too obvious, and poor feeling is brought to the user, so that accurate measurement needs to be carried out on laser speckle characteristics of the laser display equipment, such as speckle contrast, speckle particle size and speckle arrangement mode, the performance index of the laser display equipment is objectively evaluated, the existing national standard does not provide specific and clear evaluation indexes for the speckle of the laser display industry, and most of the laser display equipment is still in a test and research stage.
As shown in chinese patent application No. 202010309464.6, the related prior art discloses a laser speckle measurement system based on human visual characteristics, which includes: the laser projector is used for projecting to the projection screen; the optical lens is used for simulating human eyes and is used for acquiring an image imaged on the projection screen; and the data processor is connected with the optical lens for simulating the human eyes, and is used for obtaining the speckle contrast according to the images acquired by the optical lens for simulating the human eyes.
However, in the existing patent, an optical lens for simulating human eyes is used for simulating human eyes to obtain speckle contrast of images on a screen, the speckle measurement method is not strict enough, accuracy of speckle measurement cannot be guaranteed well, and many factors such as exposure time, temperature, external brightness and the like can have great influence on the speckle measurement in the speckle measurement process.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a speckle measurement method and device based on picture edge detection auxiliary focusing, which can be more accurate and scientific than the auxiliary focusing observed by human eyes.
In order to solve the problems, the technical scheme of the invention is as follows:
a speckle measurement method based on picture edge detection auxiliary focusing comprises the following steps:
image acquisition is carried out through a camera, a shot picture is intercepted, edge detection auxiliary focusing of the intercepted picture is carried out, and speckle measurement work is carried out when the clear contrast of the intercepted picture reaches the maximum;
setting exposure time, wherein the exposure time is set to be integral multiple of the frame frequency of the laser display equipment;
controlling a steering engine to rotate a steering engine turntable to switch the optical filter for time-delay shooting; and
and after shooting is finished, intercepting and calculating the shot speckle picture to obtain the speckle contrast.
Optionally, the image acquisition is performed through a camera, the shot picture is intercepted, the intercepted picture is subjected to edge detection auxiliary focusing, and the step of performing speckle measurement when the clear contrast of the intercepted picture reaches the maximum specifically includes: the method comprises the steps of carrying out image acquisition through an industrial camera, transmitting a shot picture to a computer, intercepting the shot picture at the computer, carrying out edge detection on the intercepted picture by using a Laplacian operator in a software program, calculating to obtain a real-time value of a visual evaluation function, slowly focusing a camera lens according to the real-time value, and carrying out speckle measurement when the value of the visual evaluation function is adjusted to the maximum value.
Optionally, the industrial camera is a MV-CA050-10GM model 500 ten thousand pixel industrial area-array camera.
Optionally, the setting the exposure time, and the setting the exposure time to be an integer multiple of the frame frequency of the laser display device specifically includes: in order to avoid that the shot picture is too bright or too dark to influence the value of the final speckle contrast, the exposure time is set, and simultaneously, in order to avoid the interference fringe phenomenon, the exposure time is set to be integral multiple of the frame frequency of the laser display equipment.
Optionally, the step of controlling the steering engine to rotate the steering engine turntable to switch the optical filter for time-delay shooting specifically comprises: the steering engine is connected with a steering engine turntable provided with a plurality of optical filters, the steering engine turntable is controlled by computer software to rotate for a fixed angle so that light penetrates through the optical filters, and the steering engine is sequentially rotated to replace the optical filters to perform time-delay shooting.
Optionally, the filters include Xr, Xb, Y, Z four filters.
Optionally, the shooting is finishedThe step of intercepting the shot speckle picture and calculating to obtain the speckle contrast specifically comprises the following steps: intercepting and calculating the speckle picture at a computer software end by using a correlation program and a formula to obtain speckle contrast, wherein the speckle contrast CsThe calculation formula of (c) may be:
where σ is the standard deviation of the speckle pattern intensity and I is the average intensity of the speckle pattern.
Further, the invention also provides a speckle measurement device based on picture edge detection auxiliary focusing, which comprises:
the image acquisition module comprises an industrial camera, the industrial camera is used for shooting speckle images and transmitting the speckle images to the computer end for calculation, and one end of the industrial camera is connected with a camera lens capable of manually adjusting the focal length and is used for measuring the definition focusing work before the speckles; and
and the software control module is used for intercepting the picture shot by the industrial camera, performing edge detection calculation on the picture by using a Laplacian operator in a software program to obtain a real-time value of the visual evaluation function, and slowly focusing the lens according to the real-time value until the value of the visual evaluation function reaches the maximum value to perform speckle measurement.
Optionally, the industrial camera is a MV-CA050-10GM model 500 ten thousand pixel industrial area-array camera.
Optionally, the image acquisition module further comprises a steering engine turntable provided with a plurality of optical filters, the steering engine turntable is connected with a steering engine, the steering engine turntable is controlled to rotate to switch different optical filters, and the optical filters comprise an Xr optical filter, an Xb optical filter, a Y optical filter and a Z optical filter.
Compared with the prior art, the speckle measurement method and device based on the auxiliary focusing of the image edge detection can perform edge detection according to a shot image and perform focusing on a visual evaluation function, and the measured speckle contrast ratio is more accurate and scientific than the focusing observed by human eyes. The speckle measurement method and the device of the invention are used for shooting to obtain the picture with the clearest speckle degree, calculating the accurate and scientific speckle contrast and evaluating the quality of the laser display equipment according to the accurate and scientific speckle contrast. In addition, the invention selects integral multiple of the frame frequency of the laser display equipment on the setting of the exposure time, so that the shot picture does not have interference phenomenon of horizontal stripes, and the delayed shooting is set to reduce the influence of vibration on the picture shooting.
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Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a flow chart of a speckle measurement method based on image edge detection-assisted focusing according to an embodiment of the present invention;
fig. 2 is a block diagram of a speckle measurement apparatus based on focusing assisted by image edge detection according to an embodiment of the present invention;
fig. 3 is an internal schematic diagram of an image acquisition module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention is analyzed and found on the basis of the speckle measurement of the laser display equipment, and the uncertainty of focusing is found to have great influence on the measurement value of the speckle contrast. The computer software is used for writing a program, the image edge detection in machine vision is used for assisting the focusing lens, the most clear lens position is obtained through judgment, the shot image is in the most obvious contrast state, and the measured speckle contrast is the most accurate value. The principle of the invention is that the edge detection of the picture is calculated by Laplace algorithm in the software program to obtain the real-time value of the visual evaluation function, and the slow focusing of the lens is carried out according to the real-time value, thereby carrying out the measurement work of the speckle.
Specifically, as shown in fig. 1, fig. 1 is a block flow diagram of a speckle measurement method based on picture edge detection assisted focusing provided by an embodiment of the present invention, where the method includes the following steps:
s1: image acquisition is carried out through a camera, a shot picture is intercepted, edge detection auxiliary focusing of the intercepted picture is carried out, and speckle measurement work is carried out when the clear contrast of the intercepted picture reaches the maximum;
specifically, to measure the speckles, an environment in a darkroom is selected, a speckle measuring device is placed at an appropriate distance of about 1.2m from a screen, an imaging device is placed on a conjugate surface of the screen, a relevant color field used for testing is adjusted to be projected by a laser display device, and the projected image is uniform in space and larger in size than a view field of the testing device.
The image acquisition is carried out through an industrial camera, in the embodiment, an MV-CA050-10GM type 500 ten thousand pixel industrial area array camera is used for shooting speckle images and transmitting the speckle images to a computer end for calculation, and one end of the industrial camera is connected with a camera lens capable of manually adjusting the focal length and used for measuring the definition focusing work before speckle. The computer intercepts the shot picture, edge detection is carried out on the picture by using a Laplacian operator in a software program, a real-time value of a visual evaluation function is obtained through calculation, slow focusing of a camera lens is carried out according to the real-time value, when the value of the visual evaluation function is adjusted to be maximum through focusing, the clear contrast of the shot picture is maximum at the moment, and speckle measurement can be carried out.
S2: setting exposure time, wherein the exposure time is set to be integral multiple of the frame frequency of the laser display equipment;
specifically, for avoiding that the shot picture is too bright or too dark so as to influence the value of the final speckle contrast, the exposure time is set, and meanwhile, for avoiding the interference fringe phenomenon, the exposure time is set to be integral multiple of the frame frequency of the laser display device, and after the exposure time is set, if the shot picture is still subjected to image overexposure, a neutral filter can be added to reduce the acquisition brightness, so that the shot speckle picture is clearer.
S3: controlling a steering engine to rotate a steering engine turntable to switch the optical filter for time-delay shooting;
specifically, the steering wheel is the high performance intelligence steering wheel of big moment of torsion, the steering wheel carousel that is equipped with the light filter is connected to the steering wheel, receives the rotatory fixed angle of computer software control to make light see through the light filter, the light filter includes four light filters of Xr, Xb, Y, Z, and four light filters are changed in the rotatory steering wheel in proper order, carry out the time delay and shoot, for making the picture of gathering clearer, gather the picture again when the inside no longer shakes of device.
S4: and after shooting is finished, intercepting and calculating the shot speckle picture to obtain the speckle contrast.
Specifically, a high-pixel industrial camera is used for shooting a speckle picture projected to a screen by laser display equipment, and the speckle picture is intercepted and calculated at a computer software end by using a related program and a formula to obtain the speckle contrast equivalent value.
For a picture with obvious speckles, its speckle contrast CsThe calculation formula of (c) may be:
where σ is the standard deviation of the speckle pattern intensity and I is the average intensity of the speckle pattern.
Further, the embodiment of the invention also provides a speckle measurement device based on picture edge detection and auxiliary focusing, wherein fig. 2 is a structural block diagram of the speckle measurement device based on picture edge detection and auxiliary focusing, fig. 3 is an internal schematic diagram of an image acquisition module, as shown in fig. 2 and fig. 3, the speckle measurement device based on picture edge detection and auxiliary focusing comprises an image acquisition module 21 and a software control module 22, the image acquisition module 21 comprises an industrial camera, the industrial camera adopts a MV-CA050-10GM type 500 ten thousand pixel industrial area array camera for shooting speckle images and transmitting the speckle images to a computer end for calculation, and one end of the industrial camera is connected with a camera lens capable of manually adjusting the focal length for measuring the definition focusing before speckle. Image acquisition module 21 includes diaphragm 1, imaging lens 2, imaging device 3, Y light filter 4, Xr light filter 6, Xb light filter 7, Z light filter 8 and steering wheel carousel 9, Y light filter 4, Xr light filter 6, Xb light filter 7, Z light filter 8 are installed on steering wheel carousel 9, and reference numeral 5 represents incident light, and steering wheel carousel 9 can be connected with a steering wheel, receives the rotatory steering wheel carousel 9 of computer software control steering wheel to play the effect of rotatory different light filters of changing for switch four kinds of different light filters. The four filters of Y, Z, Xr and Xb are added in front of the diaphragm 1. Because the reason of steering wheel vibrations, in order to guarantee to measure the accuracy, need carry out the time delay and shoot, gather the picture again when the inside no longer shakes of device.
The software control module 22 is configured to intercept a picture taken by the industrial camera, perform edge detection calculation on the picture by using a laplacian operator in a software program to obtain a real-time value of a visual evaluation function, and perform slow focusing on a lens according to the real-time value until the value of the visual evaluation function reaches a maximum value, which means that the clear contrast of the picture taken by the camera reaches a maximum value, so that speckle measurement can be performed. Then the steering engine is controlled to rotate the steering engine rotary table 9, four different Xr, Xb, Y and Z optical filters are switched to perform time-delay shooting, pictures are collected when the interior of the device does not vibrate any more, the pictures are clearer, speckle pictures projected onto a screen by laser display equipment shot by an industrial camera in an image collection module are received, and the pictures are intercepted and calculated at a computer software end by using related programs and formulas to obtain the speckle contrast equivalent value.
Since the test must ensure that there is no stray light interference, the speckle measurement device must be externally enclosed and fixed by a ferrous metal housing, and the whole measurement condition must be performed in a dark room where the illumination generated by the background light is less than 0.1 lx.
Compared with the prior art, the speckle measurement method and device based on the auxiliary focusing of the image edge detection can perform edge detection according to a shot image and perform focusing on a visual evaluation function, and the measured speckle contrast ratio is more accurate and scientific than the focusing observed by human eyes. The speckle measurement method and the device of the invention are used for shooting to obtain the picture with the clearest speckle degree, calculating the accurate and scientific speckle contrast and evaluating the quality of the laser display equipment according to the accurate and scientific speckle contrast. In addition, the invention selects integral multiple of the frame frequency of the laser display equipment on the setting of the exposure time, so that the shot picture does not have interference phenomenon of horizontal stripes, and the delayed shooting is set to reduce the influence of vibration on the picture shooting.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A speckle measurement method based on picture edge detection auxiliary focusing is characterized by comprising the following steps:
image acquisition is carried out through a camera, a shot picture is intercepted, edge detection auxiliary focusing of the intercepted picture is carried out, and speckle measurement work is carried out when the clear contrast of the intercepted picture reaches the maximum;
setting exposure time, wherein the exposure time is set to be integral multiple of the frame frequency of the laser display equipment;
controlling a steering engine to rotate a steering engine turntable to switch the optical filter for time-delay shooting; and
and after shooting is finished, intercepting and calculating the shot speckle picture to obtain the speckle contrast.
2. The speckle measurement method based on the picture edge detection auxiliary focusing according to claim 1, wherein the image acquisition is performed by a camera, the shot picture is intercepted, the edge detection auxiliary focusing is performed on the intercepted picture, and the step of performing the speckle measurement when the clear contrast of the intercepted picture reaches the maximum specifically comprises: the method comprises the steps of carrying out image acquisition through an industrial camera, transmitting a shot picture to a computer, intercepting the shot picture at the computer, carrying out edge detection on the intercepted picture by using a Laplacian operator in a software program, calculating to obtain a real-time value of a visual evaluation function, slowly focusing a camera lens according to the real-time value, and carrying out speckle measurement when the value of the visual evaluation function is adjusted to the maximum value.
3. The speckle measurement method based on picture edge detection-assisted focusing according to claim 2, characterized in that: the industrial camera adopts an MV-CA050-10GM type 500 ten thousand pixel industrial area-array camera.
4. The method for measuring speckle based on picture edge detection-aided focusing according to claim 1, wherein the step of setting the exposure time to be an integral multiple of the frame frequency of the laser display device specifically comprises: in order to avoid that the shot picture is too bright or too dark to influence the value of the final speckle contrast, the exposure time is set, and simultaneously, in order to avoid the interference fringe phenomenon, the exposure time is set to be integral multiple of the frame frequency of the laser display equipment.
5. The speckle measurement method based on the auxiliary focusing for the image edge detection of claim 1, wherein the step of controlling the steering engine to rotate the steering engine turntable to switch the optical filter for time-delay shooting specifically comprises the following steps: the steering engine is connected with a steering engine turntable provided with a plurality of optical filters, and the steering engine is controlled by computer software to rotate the steering engine turntable to replace different optical filters for time-delay shooting.
6. The method for measuring speckle based on picture edge detection-aided focusing according to claim 5, wherein the filter comprises four filters of Xr, Xb, Y and Z.
7. The method according to claim 1The speckle measurement method for the auxiliary focusing of the image edge detection is characterized in that the step of intercepting and calculating the shot speckle image after shooting to obtain the speckle contrast specifically comprises the following steps: intercepting and calculating the speckle picture at a computer software end by using a correlation program and a formula to obtain speckle contrast, wherein the speckle contrast CsThe calculation formula of (c) may be:
where σ is the standard deviation of the speckle pattern intensity and I is the average intensity of the speckle pattern.
8. A speckle measurement device based on picture edge detection-assisted focusing, characterized in that the device comprises:
the image acquisition module comprises an industrial camera, the industrial camera is used for shooting speckle images and transmitting the speckle images to the computer end for calculation, and one end of the industrial camera is connected with a camera lens capable of manually adjusting the focal length and is used for measuring the definition focusing work before the speckles; and
and the software control module is used for intercepting the picture shot by the industrial camera, performing edge detection calculation on the picture by using a Laplacian operator in a software program to obtain a real-time value of the visual evaluation function, and slowly focusing the lens according to the real-time value until the value of the visual evaluation function reaches the maximum value to perform speckle measurement.
9. The picture edge detection-assisted focusing-based speckle measurement device according to claim 8, wherein: the industrial camera adopts an MV-CA050-10GM type 500 ten thousand pixel industrial area-array camera.
10. The picture edge detection-assisted focusing-based speckle measurement device according to claim 8, wherein: the image acquisition module is still including the steering wheel carousel of installing a plurality of light filters, the steering wheel carousel is connected with a steering wheel, and the rotatory steering wheel carousel of control steering wheel is used for switching different light filters, a plurality of light filters include Xr light filter, Xb light filter, Y light filter, Z light filter.
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Application publication date: 20210910 |
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