CN115514943B - Method for detecting imaging quality of free-form surface lens - Google Patents
Method for detecting imaging quality of free-form surface lens Download PDFInfo
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- CN115514943B CN115514943B CN202211002783.8A CN202211002783A CN115514943B CN 115514943 B CN115514943 B CN 115514943B CN 202211002783 A CN202211002783 A CN 202211002783A CN 115514943 B CN115514943 B CN 115514943B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004364 calculation method Methods 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 description 5
- 238000011897 real-time detection Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/317—Convergence or focusing systems
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Abstract
The invention relates to a method for detecting imaging quality of a free-form surface lens, which comprises the following steps: step S1, placing a projector with a free-form surface lens in front of a projection screen; step S2, before the projector projects, determining projection parameters, setting and then projecting; step S3, when the projector projects, acquiring a projected image and analyzing the projected image to obtain the projection actual definition D, and determining whether the imaging comfort level of the free-form surface lens meets the standard according to the projection actual definition D after the projection actual definition D is obtained; step S4, if the projection brightness difference delta D does not meet the standard, determining an adjustment mode of the imaging comfort level, and if necessary, determining a resolution adjustment quantity by combining the projection brightness S; and S5, adjusting the resolution of the free-form surface lens according to the determined resolution adjustment amount. Therefore, the imaging comfort level can be adjusted through the projection definition and the projection brightness in the projection process so as to keep the imaging quality in an optimal state all the time.
Description
Technical Field
The invention relates to the technical field of free-form surface lenses, in particular to a method for detecting imaging quality of a free-form surface lens.
Background
Free-form lenses are being developed under the continuous push of optoelectronics and advanced manufacturing techniques, and with the advancement of society, the free-form lenses are increasingly used in a wide range. The projector is arranged above the screen obliquely, the light is refracted by a plurality of groups of lenses and then projected onto the free-form surface reflecting mirror, and the reflecting mirror projects the picture perfectly onto the screen at an inclined angle. Accordingly, with the progress of society, the quality of projection imaging with free-form surface lenses mounted thereon is becoming an issue of increasing concern.
Chinese patent CN201680003672.5 discloses a method and apparatus for detecting imaging quality of an optical system, including, reading in image data obtained from an image of a circular object with a roundness of 1 photographed by the optical system to be detected; performing image processing on the image data to obtain the area and the perimeter of the circular object in the image, and calculating the roundness of the circular object in the image according to the area and the perimeter; judging the imaging quality of the optical system according to the roundness; if the roundness is smaller than a preset roundness threshold, determining that the imaging quality of the optical system is poor; and if the roundness is greater than or equal to the roundness threshold, determining that the imaging quality of the optical system is better.
At present, some free-form surface lens imaging quality detection methods exist, but generally, the imaging comfort level cannot be adjusted through the projection definition and the projection brightness in the projection process, the imaging quality is poor, and the automatic adjustment cannot be performed.
Disclosure of Invention
Therefore, the invention provides a method for detecting the imaging quality of a free-form surface lens, which can effectively solve the technical problem that the imaging comfort level can not be regulated by the projection definition and the projection brightness in the projection process so as to keep the imaging quality in the optimal state all the time in the prior art.
In order to achieve the above object, the present invention provides a method for detecting imaging quality of a free-form surface lens, comprising:
step S1, placing a projector with a free-form surface lens in front of a projection screen;
Step S2, before the projector projects, the central control unit determines projection parameters according to the brightness A of the ambient light source and the projection distance L, and the projection unit sets and projects according to the determined projection parameters;
step S3, when the projector projects, the image acquisition unit acquires the projected image and analyzes the projected image to obtain the projected actual definition D, and after the projected actual definition D is obtained, the central control unit compares the projected actual definition D with the projected standard definition D0 to determine whether the imaging comfort level of the free-form surface lens meets the standard;
Step S4, if the imaging comfort level does not accord with the standard, the central control unit determines an adjusting mode of the imaging comfort level according to the projection definition difference DeltaD, and when the imaging comfort level needs to be adjusted by combining the projection brightness S, the central control unit compares the projection brightness S with the projection preset brightness to determine a resolution adjustment amount;
Step S5, if the imaging comfort level meets the standard, the brightness acquisition unit acquires the brightness of the projection screen, the central control unit compares the projection brightness S with the projection standard brightness S0 to determine whether the definition needs to be adjusted, and the resolution adjustment quantity is determined by combining the projection brightness difference delta S when the definition needs to be adjusted;
and S6, the resolution adjusting unit adjusts the resolution of the free-form surface lens according to the determined resolution adjusting amount so as to optimize the imaging quality.
Further, in step S2, before the projector performs projection, the central control unit determines a projection parameter according to the brightness a of the ambient light source and the projection distance L, the projection unit sets and projects according to the determined projection parameter, the image acquisition unit acquires the projected image and analyzes the projected image to obtain the actual definition D of the projection, and after the actual definition D of the projection is obtained, the central control unit compares the actual definition D of the projection with the standard definition D0 of the projection to determine whether the imaging comfort level of the free-form lens meets the standard;
if D is less than D0, the central control unit judges that the imaging comfort level of the free-form surface lens does not accord with the standard;
If D is more than or equal to D0, the central control unit judges that the imaging comfort level of the free-form surface lens meets the standard;
The projection standard definition D0 is set through the central control unit.
Further, when the central control unit judges that the imaging comfort level of the free-form surface lens does not meet the standard, the central control unit calculates a projection definition difference value delta D, and when calculation is completed, the central control unit compares the projection definition difference value delta D with a projection definition standard difference value delta D0 to determine an adjusting mode of the imaging comfort level of the free-form surface lens;
If DeltaD < DeltaD0, the central control unit determines that the imaging comfort level needs to be adjusted by combining the projection brightness S;
If the delta D is not less than delta D0, the central control unit determines that the projection comfort level cannot be adjusted;
Wherein the projection definition standard deviation DeltaD 0 is set by the central control unit.
Further, when the central control unit determines that the imaging comfort level of the free-form surface lens does not meet the standard, the central control unit calculates a projection definition difference DeltaD in the following calculation mode:
△D＝(D0-D)×(D0/D)×α；
wherein D represents the actual definition of projection, D0 represents the standard definition of projection, alpha represents the adjustment coefficient of the definition of projection, and 0 < alpha < 1.
Further, when the central control unit determines that the imaging comfort level needs to be adjusted by combining the projection brightness S, the brightness acquisition unit acquires the brightness of the projection screen, and the central control unit sets the brightness as the projection brightness S and compares the projection brightness with the projection preset brightness to determine the resolution adjustment amount;
The central control unit is provided with projection preset brightness and resolution adjustment quantity, wherein the projection preset brightness comprises projection first preset brightness S1, second preset brightness S2 and third preset brightness S3, and S1 is more than S2 and less than S3; the resolution adjustment amount comprises a resolution first adjustment amount C1, a resolution second adjustment amount C2, a resolution third adjustment amount C3 and a resolution fourth adjustment amount C4, wherein C1 is more than C2 and less than C3 and less than C4;
if S is less than S1, the central control unit judges that the resolution adjustment amount is C1;
if S1 is less than or equal to S2, the central control unit judges that the resolution adjustment amount is C2;
If S2 is less than or equal to S3, the central control unit judges that the resolution adjustment amount is C3;
And if S is more than or equal to S3, the central control unit judges that the resolution adjustment amount is C4.
Further, when the central control unit determines that the resolution adjustment amount is Ci, the resolution adjustment unit adjusts the resolution, the adjustment amount is Ci, and i=1, 2,3,4 is set.
Further, when the central control unit judges that the imaging comfort level of the free-form surface lens meets the standard, the brightness acquisition unit acquires the brightness of the projection screen, and the central control unit sets the brightness as the projection brightness S and compares the projection brightness S with the projection standard brightness S0 to determine whether the definition needs to be adjusted or not;
If S is less than or equal to S0, the central control unit judges that the definition does not need to be adjusted;
If S is more than S0, the central control unit judges that the definition needs to be adjusted;
wherein, the projection standard brightness S0 is set by the central control unit.
Further, when the central control unit judges that the definition needs to be adjusted, the central control unit calculates a projection brightness difference value delta S, and when calculation is completed, the central control unit compares the projection brightness difference value delta S with a projection brightness standard difference value to determine a resolution adjustment amount;
The central control unit is also provided with a projection brightness standard deviation value, which comprises a first projection brightness standard deviation value delta S1 and a second projection brightness standard deviation value delta S2, wherein delta S1 < [ delta ] S2;
if DeltaS < DeltaS1, the central control unit judges that the resolution adjustment amount is 0.5C1;
if DeltaS 1 is less than or equal to DeltaS < DeltaS2, the central control unit judges that the resolution adjustment amount is 0.75C1;
If DeltaS is not less than DeltaS 2, the central control unit judges that the resolution adjustment amount is 0.8C1;
Wherein C1 represents a first adjustment amount C1 of resolution, and is set by a central control unit;
after the central control unit determines the resolution adjustment amount, the resolution adjustment unit adjusts the resolution according to the determined resolution adjustment amount.
Further, when the central control unit determines that the definition needs to be adjusted, the central control unit calculates a projection brightness difference value Δs in the following calculation mode:
△S＝(S-S0)2×(S/S0)；
Where S represents the projection brightness and S0 represents the projection standard brightness.
Further, in step S2, before the projector performs projection, the brightness sensing unit collects the brightness of the ambient light source to obtain the brightness a of the ambient light source, after the brightness a of the ambient light source is obtained, the distance measuring unit measures the distance from the free-form surface lens to the projection screen to obtain the projection distance L, and after the obtaining is completed, the central control unit of the central control unit determines the projection parameters according to the brightness a of the ambient light source and the projection distance L.
Compared with the prior art, the method has the advantages that the projection parameters are determined through the brightness A of the ambient light source and the projection distance L, the projection unit is used for setting and projecting, and then whether the imaging comfort level of the free-form surface lens meets the standard or not is judged through the projection definition when the projection is carried out, when the projection is not met, the adjustment mode is determined through the projection definition difference delta D, and when the projection is not met, the resolution adjustment quantity is determined through the projection brightness S, when the projection is met, the projection brightness S is compared with the projection standard brightness S0 to determine whether the definition needs to be adjusted, when the projection is required to be adjusted, the resolution adjustment quantity is determined through the combination of the projection brightness difference delta S, and then the resolution of the free-form surface lens is adjusted through the resolution adjustment unit so as to achieve the optimal imaging quality. Therefore, the projection parameters can be accurately determined through the brightness of the ambient light source and the projection distance, the imaging comfort level can be adjusted through the projection definition and the projection brightness so as to ensure that the imaging quality is optimal, and the imaging quality in the projection process can be always in an optimal state through real-time detection and automatic adjustment in the projection process.
Furthermore, the invention compares the projection actual definition D with the projection standard definition D0 to determine whether the imaging comfort level of the free-form surface lens meets the standard, and real-time adjustment is required to be carried out during each projection, so that the optimal imaging quality can be determined according to the real-time light brightness.
Furthermore, the invention compares the projection definition difference DeltaD with the projection definition standard difference DeltaD 0 to determine the adjustment mode of the imaging comfort level of the free-form surface lens, so that the projection parameters can be accurately determined through the brightness of an ambient light source and the projection distance, and the imaging comfort level can be adjusted through the projection definition and the projection brightness to ensure that the imaging quality is optimal, and the imaging quality in the projection process can be always in an optimal state through real-time detection and automatic adjustment.
Further, the invention determines the resolution adjustment amount by comparing the projection brightness S with the projection preset brightness, so that the resolution of the free-form surface lens can be adjusted by the resolution adjustment unit to achieve the best imaging quality.
Furthermore, the invention compares the projection brightness S with the projection standard brightness S0 to determine whether the definition needs to be adjusted, and if so, compares the projection brightness difference DeltaS with the projection brightness standard difference to determine the resolution adjustment amount, so that the resolution of the free-form surface lens can be adjusted by the resolution adjustment unit to achieve the optimal imaging quality.
Drawings
FIG. 1 is a block diagram of a free-form surface lens imaging quality detection device according to an embodiment of the present invention;
Fig. 2 is a flow chart of a method for detecting imaging quality of a free-form surface lens according to an embodiment of the invention.
The figure indicates: 1. a central control unit; 2. a brightness sensing unit; 3. a ranging unit; 4. a projection unit; 5. an image acquisition unit; 6. a brightness acquisition unit; 7. and a resolution adjusting unit.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 and 2, fig. 1 is a block diagram of a device for detecting imaging quality of a free-form surface lens according to an embodiment of the present invention, and fig. 2 is a flow chart of a method for detecting imaging quality of a free-form surface lens according to an embodiment of the present invention, where the device for detecting imaging quality of a free-form surface lens according to the embodiment of the present invention includes:
the central control unit 1 is used for controlling the detection process of the free-form surface lens; in this embodiment, a PLC control board is provided in the central control unit 1.
The brightness sensing unit 2 is connected with the central control unit 1 and used for collecting the brightness of the ambient light source to obtain the brightness A of the ambient light source;
A ranging unit 3 connected with the brightness sensing unit 2 for measuring the distance from the free-form surface lens to the projection screen to obtain a projection distance L;
The projection unit 4 is connected with the central control unit 1 and is used for setting and projecting according to the determined projection parameters;
The image acquisition unit 5 is connected with the central control unit 1 and is used for acquiring a projected image and analyzing the projected image to obtain the actual definition D of projection;
The brightness acquisition unit 6 is connected with the projection unit 4 and is used for acquiring the brightness of the projection screen to obtain projection brightness S;
A resolution adjustment unit 7 connected to the central control unit 1 for adjusting the resolution of the free-form surface lens according to the determined resolution adjustment amount to optimize the imaging quality.
Referring to fig. 1, the method for detecting the imaging quality of the free-form surface lens according to the embodiment includes:
step S1, placing a projector with a free-form surface lens in front of a projection screen;
Step S2, before the projector projects, the central control unit 1 determines projection parameters according to the brightness A of the ambient light source and the projection distance L, and the projection unit 4 sets and projects according to the determined projection parameters;
Step S3, when the projector projects, the image acquisition unit 5 acquires the projected image and analyzes the projected image to obtain the projected actual definition D, and after the projected actual definition D is obtained, the central control unit 1 compares the projected actual definition D with the projected standard definition D0 to determine whether the imaging comfort level of the free-form surface lens meets the standard;
Step S4, if the imaging comfort level does not accord with the standard, the central control unit 1 determines an adjusting mode of the imaging comfort level according to the projection definition difference DeltaD, and when the imaging comfort level needs to be adjusted by combining the projection brightness S, the central control unit 1 compares the projection brightness S with the projection preset brightness to determine a resolution adjusting amount;
Step S5, if the imaging comfort level meets the standard, the brightness acquisition unit 6 acquires the brightness of the projection screen, the central control unit 1 compares the projection brightness S with the projection standard brightness S0 to determine whether the definition needs to be adjusted, and the resolution adjustment quantity is determined by combining the projection brightness difference delta S when the definition needs to be adjusted;
In step S6, the resolution adjustment unit 7 adjusts the resolution of the free-form surface lens according to the determined resolution adjustment amount so as to optimize the imaging quality.
Specifically, the invention determines the projection parameters through the brightness A of the ambient light source and the projection distance L, and sets and projects the parameters through the projection unit 4, further judges whether the imaging comfort level of the free-form surface lens accords with the standard through the projection definition when the projection is performed, determines the adjustment mode through the projection definition difference DeltaD when the projection comfort level does not accord with the standard, determines the resolution adjustment amount through the projection brightness S when the projection comfort level does not accord with the standard, determines whether the definition needs to be adjusted through comparing the projection brightness S with the projection standard brightness S0 when the projection brightness S accords with the standard, and determines the resolution adjustment amount through combining the projection brightness difference DeltaS when the projection comfort level is required to be adjusted, and further adjusts the resolution of the free-form surface lens through the resolution adjustment unit 7 so as to achieve the optimal imaging quality. Therefore, the projection parameters can be accurately determined through the brightness of the ambient light source and the projection distance, the imaging comfort level can be adjusted through the projection definition and the projection brightness so as to ensure that the imaging quality is optimal, and the imaging quality in the projection process can be always in an optimal state through real-time detection and automatic adjustment in the projection process.
Specifically, in step S2, before the projector performs projection, the central control unit 1 determines a projection parameter according to the brightness a of the ambient light source and the projection distance L, the projection unit 4 sets and projects according to the determined projection parameter, the image acquisition unit 5 acquires the projected image and analyzes the image to obtain the actual definition D of the projection, and after the actual definition D of the projection is obtained, the central control unit 1 compares the actual definition D of the projection with the standard definition D0 of the projection to determine whether the imaging comfort level of the free-form lens meets the standard;
if D is less than D0, the central control unit 1 judges that the imaging comfort level of the free-form surface lens does not accord with the standard;
if D is more than or equal to D0, the central control unit 1 judges that the imaging comfort level of the free-form surface lens meets the standard;
Wherein the projection standard definition D0 is set by the central control unit 1.
In this embodiment, the projection parameters represent relevant adjustment parameters during projection, including but not limited to focal length, projection angle, projection brightness, and color parameters. As will be appreciated by those skilled in the art, the present embodiment evaluates imaging quality in terms of imaging comfort, which is not in compliance with a standard, which means that imaging quality is not in compliance with a standard, and which requires adjustment. The central control unit 1 judges that the imaging comfort level of the free-form surface lens accords with the standard, so that the imaging quality is high, and no adjustment is needed.
Specifically, the invention compares the projection actual definition D with the projection standard definition D0 to determine whether the imaging comfort level of the free-form surface lens meets the standard, and real-time adjustment is required to be carried out during each projection, so that the optimal imaging quality can be determined according to the real-time light brightness.
Specifically, when the central control unit 1 determines that the imaging comfort level of the free-form surface lens does not meet the standard, the central control unit 1 calculates a projection definition difference value Δd, and when the calculation is completed, the central control unit 1 compares the projection definition difference value Δd with a projection definition standard difference value Δd0 to determine an adjustment mode of the imaging comfort level of the free-form surface lens;
If DeltaD < DeltaD0, the central control unit 1 determines that the imaging comfort degree needs to be adjusted by combining the projection brightness S;
If the delta D is not less than delta D0, the central control unit 1 determines that the projection comfort level cannot be adjusted;
Wherein the projection definition standard deviation DeltaD 0 is set by the central control unit 1.
In this embodiment, when the central control unit 1 cannot adjust the projection comfort, the central control unit 1 re-determines the projection parameters along with the ambient light source measurement a and the projection distance L, and then the projection unit 4 performs the projection after adjusting.
Specifically, the invention compares the projection definition difference DeltaD with the projection definition standard difference DeltaD 0 to determine the adjustment mode of the imaging comfort level of the free-form surface lens, so that the projection parameters can be accurately determined through the brightness of an ambient light source and the projection distance, the imaging comfort level can be adjusted through the projection definition and the projection brightness to ensure that the imaging quality is optimal, and the real-time detection and automatic adjustment in the projection process can ensure that the imaging quality in the projection process can always be in an optimal state.
Specifically, when the central control unit 1 determines that the imaging comfort level of the free-form surface lens does not meet the standard, the central control unit 1 calculates a projection definition difference Δd in the following manner:
△D＝(D0-D)×(D0/D)×α；
wherein D represents the actual definition of projection, D0 represents the standard definition of projection, alpha represents the adjustment coefficient of the definition of projection, and 0 < alpha < 1.
Specifically, when the central control unit 1 determines that the imaging comfort level needs to be adjusted in combination with the projection brightness S, the brightness acquisition unit 6 acquires the brightness of the projection screen, and the central control unit 1 sets the brightness as the projection brightness S and compares the projection brightness with the projection preset brightness to determine the resolution adjustment amount;
The central control unit 1 is provided with projection preset brightness and resolution adjustment quantity, wherein the projection preset brightness comprises projection first preset brightness S1, second preset brightness S2 and third preset brightness S3, and S1 is more than S2 and less than S3; the resolution adjustment amount comprises a resolution first adjustment amount C1, a resolution second adjustment amount C2, a resolution third adjustment amount C3 and a resolution fourth adjustment amount C4, wherein C1 is more than C2 and less than C3 and less than C4;
if S is less than S1, the central control unit 1 judges that the resolution adjustment amount is C1;
if S1 is less than or equal to S2, the central control unit 1 judges that the resolution adjustment amount is C2;
If S2 is less than or equal to S3, the central control unit 1 judges that the resolution adjustment amount is C3;
and if S is more than or equal to S3, the central control unit 1 judges that the resolution adjustment amount is C4.
Specifically, the present invention determines the resolution adjustment amount by comparing the projection brightness S with the projection preset brightness, so that the resolution of the free-form surface lens can be adjusted by the resolution adjustment unit 7 to achieve the best imaging quality.
Specifically, when the central control unit 1 determines that the resolution adjustment amount is Ci, the resolution adjustment unit 7 adjusts the resolution, and the adjustment amount is Ci, i=1, 2,3,4 is set.
Specifically, when the central control unit 1 determines that the imaging comfort level of the free-form surface lens meets the standard, the brightness acquisition unit 6 acquires the brightness of the projection screen, and the central control unit 1 sets the brightness as the projection brightness S and compares the projection brightness with the projection standard brightness S0 to determine whether the definition needs to be adjusted;
if S is less than or equal to S0, the central control unit 1 judges that the definition does not need to be adjusted;
if S is more than S0, the central control unit 1 judges that the definition needs to be adjusted;
Wherein the projection standard brightness S0 is set by the central control unit 1.
In this embodiment, there is no relation between the projection standard luminance S0 and the projection preset luminance.
Specifically, when the central control unit 1 determines that the definition needs to be adjusted, the central control unit 1 calculates a projection brightness difference value Δs, and when the calculation is completed, the central control unit 1 compares the projection brightness difference value Δs with a projection brightness standard difference value to determine a resolution adjustment amount;
the central control unit 1 is further provided with a projection brightness standard deviation value, wherein the projection brightness standard deviation value comprises a first projection brightness standard deviation value delta S1 and a second projection brightness standard deviation value delta S2, and the delta S1 is < [ delta ] S2;
if DeltaS < DeltaS1, the central control unit 1 judges that the resolution adjustment amount is 0.5C1;
If DeltaS 1 is less than or equal to DeltaS < DeltaS2, the central control unit 1 judges that the resolution adjustment amount is 0.75C1;
if DeltaS is not less than DeltaS 2, the central control unit 1 judges that the resolution adjustment amount is 0.8C1;
wherein, C1 represents a first adjustment amount C1 of resolution, and is set by the central control unit 1;
after the central control unit 1 determines the resolution adjustment amount, the resolution adjustment unit 7 adjusts the resolution according to the determined resolution adjustment amount.
Specifically, the invention determines whether the definition needs to be adjusted by comparing the projection brightness S with the projection standard brightness S0, and if the definition needs to be adjusted, compares the projection brightness difference Δs with the projection brightness standard difference to determine the resolution adjustment amount, so that the resolution of the free-form surface lens can be adjusted by the resolution adjustment unit 7 to achieve the best imaging quality.
Specifically, when the central control unit 1 determines that the sharpness needs to be adjusted, the central control unit 1 calculates a projection brightness difference Δs in the following manner:
△S＝(S-S0)2×(S/S0)；
Where S represents the projection brightness and S0 represents the projection standard brightness.
Specifically, in step S2, before the projector performs projection, the brightness sensing unit 2 collects the brightness of the ambient light source to obtain the brightness a of the ambient light source, after the brightness a of the ambient light source is obtained, the distance measuring unit 3 measures the distance from the free-form surface lens to the projection screen to obtain the projection distance L, and after the obtaining is completed, the central control unit 1 of the central control unit 1 determines the projection parameters according to the brightness a of the ambient light source and the projection distance L.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
Claims (10)
1. A method for detecting imaging quality of a free-form lens, comprising:
step S1, placing a projector with a free-form surface lens in front of a projection screen;
Step S2, before the projector projects, the central control unit determines projection parameters according to the brightness A of the ambient light source and the projection distance L, and the projection unit sets and projects according to the determined projection parameters;
step S3, when the projector projects, the image acquisition unit acquires the projected image and analyzes the projected image to obtain the projected actual definition D, and after the projected actual definition D is obtained, the central control unit compares the projected actual definition D with the projected standard definition D0 to determine whether the imaging comfort level of the free-form surface lens meets the standard;
Step S4, if the imaging comfort level does not accord with the standard, the central control unit determines an adjusting mode of the imaging comfort level according to the projection definition difference DeltaD, and when the imaging comfort level needs to be adjusted by combining the projection brightness S, the central control unit compares the projection brightness S with the projection preset brightness to determine a resolution adjustment amount;
Step S5, if the imaging comfort level meets the standard, the brightness acquisition unit acquires the brightness of the projection screen, the central control unit compares the projection brightness S with the projection standard brightness S0 to determine whether the definition needs to be adjusted, and the resolution adjustment quantity is determined by combining the projection brightness difference delta S when the definition needs to be adjusted;
and S6, the resolution adjusting unit adjusts the resolution of the free-form surface lens according to the determined resolution adjusting amount so as to optimize the imaging quality.
2. The method according to claim 1, wherein in the step S2, before the projector performs projection, the central control unit determines a projection parameter according to the brightness a of the ambient light source and the projection distance L, the projection unit sets and projects according to the determined projection parameter, the image acquisition unit acquires the projected image and analyzes the image to obtain the projected actual definition D, and after the image acquisition, the central control unit compares the projected actual definition D with the projected standard definition D0 to determine whether the imaging comfort of the free-form lens meets the standard;
if D is less than D0, the central control unit judges that the imaging comfort level of the free-form surface lens does not accord with the standard;
If D is more than or equal to D0, the central control unit judges that the imaging comfort level of the free-form surface lens meets the standard;
The projection standard definition D0 is set through the central control unit.
3. The method for detecting the imaging quality of the free-form surface lens according to claim 2, wherein when the central control unit judges that the imaging comfort level of the free-form surface lens does not meet the standard, the central control unit calculates a projection definition difference value Δd, and when the calculation is completed, the central control unit compares the projection definition difference value Δd with the projection definition standard difference value Δd0 to determine an adjustment mode of the imaging comfort level of the free-form surface lens;
If DeltaD < DeltaD0, the central control unit determines that the imaging comfort level needs to be adjusted by combining the projection brightness S;
If the delta D is not less than delta D0, the central control unit determines that the projection comfort level cannot be adjusted;
Wherein the projection definition standard deviation DeltaD 0 is set by the central control unit.
4. The method for detecting the imaging quality of the free-form surface lens according to claim 2, wherein when the central control unit determines that the imaging comfort of the free-form surface lens does not meet the standard, the central control unit calculates a projection definition difference Δd by the following calculation method:
△D＝(D0-D)×(D0/D)×α；
wherein D represents the actual definition of projection, D0 represents the standard definition of projection, alpha represents the adjustment coefficient of the definition of projection, and 0 < alpha < 1.
5. The method for detecting the imaging quality of the free-form surface lens according to claim 3, wherein when the central control unit determines that the imaging comfort level needs to be adjusted in combination with the projection brightness S, the brightness acquisition unit acquires the brightness of the projection screen, and the central control unit sets the brightness as the projection brightness S and compares the projection brightness with the projection preset brightness to determine the resolution adjustment amount;
The central control unit is provided with projection preset brightness and resolution adjustment quantity, wherein the projection preset brightness comprises projection first preset brightness S1, second preset brightness S2 and third preset brightness S3, and S1 is more than S2 and less than S3; the resolution adjustment amount comprises a resolution first adjustment amount C1, a resolution second adjustment amount C2, a resolution third adjustment amount C3 and a resolution fourth adjustment amount C4, wherein C1 is more than C2 and less than C3 and less than C4;
if S is less than S1, the central control unit judges that the resolution adjustment amount is C1;
if S1 is less than or equal to S2, the central control unit judges that the resolution adjustment amount is C2;
If S2 is less than or equal to S3, the central control unit judges that the resolution adjustment amount is C3;
And if S is more than or equal to S3, the central control unit judges that the resolution adjustment amount is C4.
6. The method according to claim 5, wherein the central control unit determines the resolution adjustment amount Ci, and the resolution adjustment unit adjusts the resolution by setting i=1, 2,3, and 4.
7. The method for detecting the imaging quality of the free-form surface lens according to claim 2, wherein when the central control unit determines that the imaging comfort level of the free-form surface lens meets the standard, the brightness acquisition unit acquires the brightness of the projection screen, and the central control unit sets the brightness as the projection brightness S and compares the projection brightness S with the projection standard brightness S0 to determine whether the definition needs to be adjusted;
If S is less than or equal to S0, the central control unit judges that the definition does not need to be adjusted;
If S is more than S0, the central control unit judges that the definition needs to be adjusted;
wherein, the projection standard brightness S0 is set by the central control unit.
8. The method for detecting the imaging quality of the free-form surface lens according to claim 7, wherein when the central control unit judges that the definition needs to be adjusted, the central control unit calculates a projection brightness difference value deltas, and when the calculation is completed, the central control unit compares the projection brightness difference value deltas with a projection brightness standard difference value to determine a resolution adjustment amount;
The central control unit is also provided with a projection brightness standard deviation value, which comprises a first projection brightness standard deviation value delta S1 and a second projection brightness standard deviation value delta S2, wherein delta S1 < [ delta ] S2;
if DeltaS < DeltaS1, the central control unit judges that the resolution adjustment amount is 0.5C1;
if DeltaS 1 is less than or equal to DeltaS < DeltaS2, the central control unit judges that the resolution adjustment amount is 0.75C1;
If DeltaS is not less than DeltaS 2, the central control unit judges that the resolution adjustment amount is 0.8C1;
Wherein C1 represents a first adjustment amount C1 of resolution, and is set by a central control unit;
after the central control unit determines the resolution adjustment amount, the resolution adjustment unit adjusts the resolution according to the determined resolution adjustment amount.
9. The method for detecting the imaging quality of the free-form surface lens according to claim 7, wherein when the central control unit determines that the sharpness needs to be adjusted, the central control unit calculates a projection brightness difference Δs in the following manner:
△S＝(S-S0)2×(S/S0)；
Where S represents the projection brightness and S0 represents the projection standard brightness.
10. The method according to claim 1, wherein in the step S2, the brightness sensing unit collects the brightness of the ambient light source to obtain the brightness a of the ambient light source before the projector performs the projection, and the ranging unit measures the distance from the free-form lens to the projection screen to obtain the projection distance L after the brightness a of the ambient light source is obtained, and the central control unit determines the projection parameters according to the brightness a of the ambient light source and the projection distance L after the obtaining is completed.
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| CN103338342A (en) * | 2013-03-19 | 2013-10-02 | 卿婷 | Self-adaption projector |
| WO2013178213A2 (en) * | 2012-06-01 | 2013-12-05 | Cornelius Heiko | Method for automatic imaging correction of a projector |
| CN108088654A (en) * | 2017-12-07 | 2018-05-29 | 东莞职业技术学院 | Projector quality determining method and its electronic equipment |
| CN113132700A (en) * | 2021-04-12 | 2021-07-16 | 深圳市和天创科技有限公司 | Method and system for adjusting contrast of projector |
| CN114779564A (en) * | 2022-03-31 | 2022-07-22 | 南通理工学院 | Projection equipment for automatically adjusting lens direction for digital media |
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| WO2013178213A2 (en) * | 2012-06-01 | 2013-12-05 | Cornelius Heiko | Method for automatic imaging correction of a projector |
| CN103338342A (en) * | 2013-03-19 | 2013-10-02 | 卿婷 | Self-adaption projector |
| CN108088654A (en) * | 2017-12-07 | 2018-05-29 | 东莞职业技术学院 | Projector quality determining method and its electronic equipment |
| CN113132700A (en) * | 2021-04-12 | 2021-07-16 | 深圳市和天创科技有限公司 | Method and system for adjusting contrast of projector |
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