CN110864880B - A kind of DLP projector definition evaluation method and its detection system - Google Patents
A kind of DLP projector definition evaluation method and its detection system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
- G01M11/0257—Testing optical properties by measuring geometrical properties or aberrations by analyzing the image formed by the object to be tested
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
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- G06T2207/30108—Industrial image inspection
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Abstract
本发明公开了一种基于工业相机矫正进行DLP投影仪清晰度侧视的方法，本发明包括采用矫正过程获取的参考值SFRcal和采用检测过程获取的检测值SFRrel，并根据归一化公式SFR=SFRrel/SFRcal×100%计算矫正值SFR，其中：所述检测过程中的检测图形为黑色矩形投影，所述矫正过程中的检测图形为粘贴的黑色不透光矩形片，且黑色矩形投影的位置与黑色不透光矩形片的位置相重合。本发明通过该种方式降低因工业相机的自身成像原因造成的检测值不准确的因素，因此通过归一法，将矫正值SFRcal作为基数来矫正检测值，获取的最终用于判定DLP投影仪的矫正值，该矫正值的获取排除了工业相机本身的因素，对于评价DLP投影仪的成像质量更具有代表性。
The invention discloses a method for performing side view of DLP projector clarity based on industrial camera correction. The invention includes a reference value SFRcal obtained by a correction process and a detection value SFRrel obtained by a detection process, and according to the normalization formula SFR= SFR rel /SFR cal ×100% calculate the correction value SFR, wherein: the detection pattern in the detection process is a black rectangle projection, the detection pattern in the correction process is a pasted black opaque rectangular sheet, and the black rectangle projection The position coincides with the position of the black opaque rectangular sheet. In this way, the present invention reduces the factor of inaccurate detection value caused by the self-imaging of the industrial camera. Therefore, through the normalization method, the correction value SFR cal is used as the base to correct the detection value, and the obtained value is finally used to determine the DLP projector. The acquisition of the correction value excludes the factors of the industrial camera itself, and is more representative for evaluating the imaging quality of the DLP projector.
Description
Technical Field
The invention relates to the technical field of DPL projectors, in particular to a DLP projector definition evaluation method and a DLP projector definition detection system.
Background
The popularization of present projecting apparatus as no screen super large screen TV and the promotion of communication speed, people are more and more enthusiastic to high definition picture quality, super high definition picture quality, and the definition can be felt for people directly perceived, and the definition also is an important examination item at the in-process of projecting apparatus equipment.
For such DLP projectors, the definition of the projector needs to be tested when the projector is shipped from the factory. The definition condition of the traditional DLP projector is judged by naked eyes, the subjectivity is strong, the accuracy is also different from person to person, the fatigue of people is easily caused, and the efficiency is low. In order to realize the automatic test of the definition condition of the DLP projector, an industrial camera can be used for shooting an image when a specific test Chart (Chart) is projected under the working state of the projector, and the condition of the projector is judged through an algorithm. Because the peripheral test values of the industrial camera have inaccurate factors due to hardware of the industrial camera, the representativeness of the definition value acquired by the industrial camera is poor, and the objectivity of the definition evaluation of the DLP projector is poor.
Therefore, there is a need for an improvement to overcome the deficiencies of the prior art.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides a DLP projector definition evaluation method with more accurate test value, and also provides a detection system for supporting the definition evaluation method.
The technical scheme of the invention is as follows:
a DLP projector sharpness evaluation method, the detection method comprising:
obtaining DLP projector definition reference value SFRcal；
Obtaining a sharpness detection value SFR of a DLP projectorrel；
According to the definition reference value SFRcalAnd the sharpness detection value SFRrelCalculating a definition correction value SFR;
and evaluating the definition of the DLP projector according to the definition correction value SFR.
As a preferred technical solution, the evaluating the sharpness of the DLP projector according to the sharpness correction value SFR includes:
acquiring a plurality of groups of definition correction values SFR;
giving corresponding weight to each group of the definition correction value SFR according to the detection position obtained by each group of the definition correction value SFR;
calculating a weighted mean SFR of all the values SFR of the clear correction by means of a weighted meanave；
By weighted mean SFRaveAnd comparing the definition with a definition standard evaluation table to obtain the definition evaluation of the DLP projector.
As a preferred solution, according to the sharpness reference value SFRcalAnd the sharpness detection value SFRrelCalculating the sharpness correction value SFR includes:
and calculating a correction value SFR by utilizing a normalization formula SFR = SFRrel/SFRcal multiplied by 100% according to the definition reference value SFRcal and the definition detection value SFRrel.
As a preferred technical solution, the obtaining DLP projector definition reference value SFRcalThe method comprises the following steps:
sticking a black opaque rectangular sheet to a to-be-detected area of the rear projection screen;
projecting a first detection image on the rear projection screen, wherein the first detection image is a white picture;
selecting a target area through an industrial camera frame to obtain a definition value, wherein the target area comprises a black opaque rectangular sheet part and a white picture part;
adjusting the focal length of the industrial camera to a specific state, and fixing the industrial camera to record the definition value in the specific state as a reference value SFRcal。
As a preferred technical solution, the obtaining of the sharpness detection value SFR of the DLP projectorrelThe method comprises the following steps:
removing the black opaque rectangular sheet, and projecting a second detection image, wherein the second detection image is a white picture with a black rectangular projection, and the black rectangular projection is overlapped with the area where the black opaque rectangular sheet is stuck;
acquiring definition value of the same target area as the area by an industrial camera to be a detection value SFRrel。
As a preferred technical solution, the first detection image and the second detection image are both provided with positioning aids, and the positioning aids are used for positioning the black opaque rectangular sheet, the black rectangular projection and the target area.
As a preferred solution, the positioning aid comprises at least one set of auxiliary crosses arranged on the projection screen.
As a preferred technical solution, the acquiring process of the target area includes:
acquiring the edge center points of the black opaque rectangular sheet and the black image area through the auxiliary crosses;
and establishing a rectangular frame by using the central point, wherein the rectangular frame does not exceed the range of the black opaque rectangular sheet, and the rectangular frame is the target area.
As a preferable technical scheme, the black opaque rectangular sheet is obliquely pasted on the rear projection screen, and the inclination angle of the black opaque rectangular sheet is 2-10 °.
As a preferred technical scheme, the black opaque rectangular sheet is a film sheet.
As a preferable technical means, the present invention is characterized in that: each area is correspondingly distributed with a weight, and the specific state is the state that the weighted average of the definition values of all the detection areas is the maximum value.
The invention also relates to a DLP projector sharpness detection system, said system comprising:
the back projection screen is used for presenting a projection image of the DLP projector and serving as a carrier for image acquisition of the industrial camera;
film: the device is used for being pasted on an area to be detected of an image acquisition surface of a rear projection screen in the correction process, wherein the film is a rectangular film and is black and opaque;
the industrial camera is used for acquiring a projected image and sending the projected image to the testing machine; the industrial camera and the DPL projector are respectively positioned on two sides of the rear projection screen;
the tester is used for controlling the shooting area of the industrial camera, acquiring a shot image of the industrial camera for image processing and outputting a definition value;
the tool jig is used for installing an industrial camera.
The invention has the beneficial effects that: the invention obtains the reference value SFR through the correction processcalAnd then obtaining the detection value SFR through the conventional common detection processrelIn the correction process, black opaque rectangular sheets are used for replacing black rectangular projections in the conventional detection process, and the factor of inaccurate detection value caused by self imaging of an industrial camera is reduced by the mode, so that the corrected value SFR is corrected by a normalization methodcalThe detection value is corrected as a base number, and the correction value is finally acquired for determining the DLP projector, and the acquisition of the correction value excludes factors of the industrial camera and is more representative for evaluating the imaging quality of the DLP projector.
Drawings
FIG. 1 is a schematic diagram of a sharpness detection system;
fig. 2 is a front view of a rear projection screen.
Wherein: 1. the device comprises a testing machine, 2, an industrial camera, 3, a rear projection screen, 4, a DPL projector, 5, a film, 6, an auxiliary cross, 7 and a target area.
Detailed Description
In order to make the technical means, technical features, objects and technical effects of the present invention easily understandable, the present invention is further described below with reference to the specific drawings.
Example one
As shown in fig. 1, the present embodiment provides a DLP projector sharpness detecting system, which includes a rear projection screen 3, a film 5, an industrial camera 2, a testing machine 1 and a tooling fixture for installing the tooling camera 2, wherein:
a rear projection screen 3 for presenting the projection image of the DPL projector 4 and serving as a carrier for image acquisition by the industrial camera 2;
5, film 5: the film sheet 5 is a rectangular sheet and is black and light-proof, and is used for being stuck on an area to be detected on the image acquisition surface of the rear projection screen 3 in the correction process;
the industrial camera 2 is used for acquiring a projected image and sending the projected image to the testing machine 1; the industrial camera 2 and the DLP projector 4 are respectively positioned at two sides of the rear projection screen 3;
the testing machine 1 is used for controlling the shooting area of the industrial camera 2, acquiring the shot image of the industrial camera 2 for image processing and outputting a definition value;
the tool jig is used for installing the industrial camera 2.
As shown in fig. 1, the rear-projection screen 3 is in a vertical state, the rear-projection screen 3 is generally made of a special PVC material with high light transmittance, and has the main characteristic that sunlight can be filtered more through the high light transmittance, so that the influence of the reflection effect of the sunlight on the human appearance is reduced.
Example two
This embodiment provides a method for correcting a DLP projector sharpness test value, which can be used to detect and correct sharpness of any position on a rear projection screen 3 by using the above DLP projector sharpness detection system, and this embodiment specifically describes, by taking a method for detecting sharpness in the peripheral direction of a projection screen shown in fig. 2 as an example, the method including the following steps:
s1, sticking black opaque rectangular sheets to specific areas on the back side of a projection picture of the rear projection screen 3, as shown in FIG. 2, when the periphery of a detection picture is detected, sticking a black opaque rectangular sheet to four corners respectively, wherein the specific areas are areas to be detected, a film sheet 5 is selected as a preferred black opaque rectangular sheet, and according to the use standard of a resolution test card in the image quality detection standard ISO12233-2014, the film sheet 5 is obliquely stuck to the rear projection screen 3, the inclination angle of the film sheet 5 is generally set to be 2-10 degrees, the preference is given, and the inclination angle of the film sheet 5 is generally selected to be 4 degrees or 6 degrees;
in order to further understand the inclination angle, a central line in the length direction and a central line in the width direction of the rear projection screen 3 form a first coordinate system, a central line in the length direction and a central line in the width direction of the film 5 form a second coordinate system, base points of the two coordinate systems are overlapped, and a deflection angle of a coordinate axis of the second coordinate system relative to a coordinate axis of the first coordinate system is a deflection angle of the film 5. It should be noted that the first coordinate system and the second coordinate system described above are both coordinate systems that are convenient for understanding the assumption of the deflection angle of the film 5, regardless of the correction method of the present embodiment.
S2, projecting a first detection image on the rear projection screen 3, where the first detection image is a white picture on which at least one set of auxiliary crosses 6 is arranged, and as shown in fig. 2, the auxiliary crosses 6 can be used as reference points due to their structural characteristics, and serve as coordinate systems to position the film 5;
s3, selecting a target area 7 through an industrial camera frame to obtain a definition value, wherein the target area 7 comprises a film 5 part and a white picture part; as shown in fig. 2, when the target area 7 is selected, the position of the center point of the edge of the film 5 is obtained through the auxiliary cross 6, and a rectangular frame is established according to the center point, the rectangular frame does not exceed the range of the black opaque rectangular sheet, the target area 7 is located in the rectangular frame, that is, the film 5 and the white picture in the target area 7 respectively account for half.
S4, adjusting the focal length of the industrial camera 2 to a specific state, and fixing the industrial camera 2 to record the definition value in the specific state as a reference value SFRcal(ii) a When the focal length of the industrial camera 2 is adjusted, the definition values of the four target areas 7 all change, the trend of the definition value of a single target area 7 is a quadratic function curve with a downward opening, namely, the definition value of each target area has a peak value, but the trend of the four target areas is not synchronous, therefore, each area is correspondingly assigned with a weight, the influence of the industrial camera 2 on different positions on the rear projection screen 3 is different, the weight assignment depends on the position of the target area, the specific state is a state that the weighted average of the definition values of all detection areas is the maximum value, namely, a certain precision is set, in the process of adjusting the focal length of the industrial camera 2, the weighted average value of the definition values of the four target areas 7 is calculated according to the definition values of the four target areas 7, when the value of the weighted average value reaches the wave peak value, the focal length of the fixed industrial camera 2 does not change any more, and the definition value recorded in each target area 7 is the reference value SFR of each target areacal。
S5, removing the film 5, and projecting a second detection image, wherein the second detection image is a white picture with a black rectangular projection, and the black rectangular projection is overlapped with the region where the film 5 is stuck;
s6, collecting the definition value of the same target area as the area in the step S3 as the detection value SFR through the industrial camera 2relThe frame selected position of the target area completely coincides with that in step S3, and the detection value SFR of each target area 7 is acquired at the focal length of the industrial camera 2 adjusted in step S4rel。
S7, and according to the normalized formula SFR = SFRrel/SFRcalX 100% calculation of the correction value SFR, obtaining the correction for each target zone 7And evaluating the definition of the DLP projector by a certain algorithm and evaluation rules by integrating the correction values SFR of all the target areas.
EXAMPLE III
The embodiment provides a definition evaluation method based on industrial camera correction, a plurality of detection areas are arranged on a rear projection screen 2, correction values SFR of all the detection areas are obtained by adopting the correction method of the DLP projector definition test value in the steps S1-S7, corresponding weight is given to each detection area, and an average mean value SFR is calculated by a weighted average methodaveBy comparing the mean values SFRaveWith a standard value SFRstaAn evaluation of the DPL projector sharpness is obtained.
In summary, the embodiments of the present invention are merely exemplary and should not be construed as limiting the scope of the invention. All equivalent changes and modifications made according to the content of the claims of the present invention should fall within the technical scope of the present invention.
Claims (9)
1. A DLP projector definition evaluation method is characterized in that: the evaluation method comprises the following steps:
obtaining DLP projector definition reference value SFRcal；
Obtaining a sharpness detection value SFR of a DLP projectorrel；
According to the definition reference value SFRcalAnd the sharpness detection value SFRrelCalculating a definition correction value SFR;
evaluating the definition of the DLP projector according to the definition correction value SFR;
according to the definition reference value SFRcalAnd the sharpness detection value SFRrelCalculating the sharpness correction value SFR includes:
according to the definition reference value SFRcalAnd the sharpness detection value SFRrelUsing the normalized formula SFR = SFRrel/SFRcalX 100% calculating the corrected value SFR;
obtaining DLP projector definition reference value SFRcalThe method comprises the following steps:
sticking a black opaque rectangular sheet to a to-be-detected area of the rear projection screen;
projecting a first detection image on the rear projection screen, wherein the first detection image is a white picture;
selecting a target area through an industrial camera frame to obtain a definition value, wherein the target area comprises a black opaque rectangular sheet part and a white picture part;
adjusting the focal length of the industrial camera to a specific state, and fixing the industrial camera to record the definition value in the specific state as a reference value SFRcal；
Obtaining the definition detection value SFR of the DLP projectorrelThe method comprises the following steps:
removing the black opaque rectangular sheet, and projecting a second detection image, wherein the second detection image is a white picture with a black rectangular projection, and the black rectangular projection is overlapped with the area where the black opaque rectangular sheet is stuck;
acquiring definition value of the same target area as the target area into a detection value SFR by an industrial camerarel。
2. The DLP projector sharpness evaluation method of claim 1, characterized in that: the evaluation of the definition of the DLP projector according to the definition correction value SFR comprises the following steps:
acquiring a plurality of groups of definition correction values SFR;
giving corresponding weight to each group of the definition correction value SFR according to the target area obtained by each group of the definition correction value SFR;
calculating a weighted mean SFR of all the values SFR of the clear correction by means of a weighted meanave；
By weighted mean SFRaveAnd comparing the definition with a definition standard evaluation table to obtain the definition evaluation of the DLP projector.
3. The DLP projector sharpness evaluation method of claim 1, characterized in that: the first detection image and the second detection image are provided with positioning aids, and the positioning aids are used for positioning the black opaque rectangular sheet, the black rectangular projection and the target area.
4. The DLP projector sharpness evaluation method of claim 3, characterized in that: the positioning aid includes at least one set of auxiliary crosses disposed on the rear projection screen.
5. The DLP projector clarity evaluation method according to claim 4, wherein: the acquisition process of the target area comprises the following steps:
acquiring the center points of the edges of the black opaque rectangular sheet and the black rectangular projection area through the auxiliary crosses;
and establishing a rectangular frame by using the central point, wherein the rectangular frame does not exceed the range of the black opaque rectangular sheet, and the rectangular frame is the target area.
6. The DLP projector sharpness evaluation method of claim 1: the method is characterized in that: the black light-tight rectangular sheet is obliquely stuck on the rear projection screen, and the inclination angle of the black light-tight rectangular sheet is 2-10 degrees.
7. The DLP projector sharpness evaluation method of claim 1: the method is characterized in that: the black light-tight rectangular sheet is a film sheet.
8. The DLP projector sharpness evaluation method of claim 1, characterized in that: each target area is correspondingly distributed with a weight, and the specific state is the state that the weighted average of the definition values of all the target areas is the maximum value.
9. The DLP projector sharpness evaluation method according to any one of claims 1 to 8, characterized in that: the DLP projector definition evaluation method carries out detection through a DLP projector definition detection system; the DLP projector sharpness detection system includes:
the back projection screen is used for presenting a projection image of the DLP projector and serving as a carrier for image acquisition of the industrial camera;
the film is used for being stuck on an area to be detected of the image acquisition surface of the rear projection screen in the correction process, and the film is a rectangular film and is black and light-proof;
the industrial camera is used for acquiring a projected image and sending the projected image to the testing machine; the industrial camera and the DLP projector are respectively positioned on two sides of the rear projection screen;
the tester is used for controlling the shooting area of the industrial camera, acquiring a shot image of the industrial camera for image processing and outputting a definition value;
the tool jig is used for installing an industrial camera.
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