CN113542709A - Projection image brightness adjusting method and device, storage medium and projection equipment - Google Patents
Projection image brightness adjusting method and device, storage medium and projection equipment Download PDFInfo
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Abstract
The present disclosure relates to a method and an apparatus for adjusting brightness of a projected image, a storage medium and a projection device, wherein the method is applied to the projection device, and comprises the following steps: under the condition that a projection image covers a detection area of a projection area, recording a first source image corresponding to the detection area, and acquiring a brightness value of the detection area to obtain a first brightness value; acquiring a brightness gain parameter and an area influence parameter; calculating a target ambient light brightness value based on the brightness gain parameter, the area impact parameter, the first source image, and the first brightness value; and adjusting the brightness of the projection image output by the projection equipment according to the target environment light brightness value and the incidence relation between the environment light brightness value and the projection equipment output brightness value, wherein the incidence relation is determined in a calibration environment.
Description
Technical Field
The present disclosure relates to the field of projection technologies, and in particular, to a method and an apparatus for adjusting brightness of a projected image, a storage medium, and a projection device.
Background
Automatic brightness adjustment is a common function of display devices, and is also becoming popular in projection devices in recent years. Unlike devices such as cell phones, in a projection scene, the difference between the brightness on the user side and the brightness of the projection screen viewed by the user may be large. Moreover, since the light in the projection scene is more complex, it is difficult to accurately detect the ambient brightness in practical application, which finally results in the accuracy of automatic brightness adjustment of the projection device being reduced, and affects the user experience.
Disclosure of Invention
The present disclosure is directed to a method and an apparatus for adjusting brightness of a projected image, a storage medium, and a projection device, so as to solve the above-mentioned related technical problems.
To this end, according to a first aspect of the embodiments of the present disclosure, there is provided a method for adjusting brightness of a projection image, applied to a projection apparatus, the method including:
under the condition that a projection image covers a detection area of a projection area, recording a first source image corresponding to the detection area, and acquiring a brightness value of the detection area to obtain a first brightness value;
acquiring a brightness gain parameter and an area influence parameter, wherein the brightness gain parameter is used for describing the difference between the gain of the projection area to the light brightness and the gain of the calibration projection area to the light brightness, the calibration projection area is a projection area under a calibration environment, and the area influence parameter is used for describing the difference between the area of an uncorrected projection image and the calibration area;
calculating a target environment light brightness value based on the brightness gain parameter, the area influence parameter, the first source image and the first brightness value;
and adjusting the brightness of the projection image output by the projection equipment according to the target environment light brightness value and the incidence relation between the environment light brightness value and the projection equipment output brightness value, wherein the incidence relation is determined in a calibration environment.
Optionally, obtaining a brightness gain parameter includes:
under the condition that the detection area does not cover the projection image, acquiring the brightness value of the detection area to obtain a second brightness value;
calculating the brightness value of the first source image in the calibration environment according to the brightness reference parameter, wherein the brightness reference parameter comprises a target brightness value when a calibration detection area displays a white picture and a brightness stimulation value when the calibration detection area displays three primary colors, and the calibration detection area is a detection area of the projection equipment in the calibration environment;
and calculating a brightness gain parameter according to the first brightness value, the second brightness value and the brightness value of the first source image in the calibration environment.
Optionally, calculating the brightness value of the first source image in the calibration environment according to the brightness reference parameter includes:
calculating the average value of R channels, the average value of G channels and the average value of B channels of all pixel points in the first source image;
calculating the product of the average value of each channel and the brightness stimulation value of the corresponding optical primary color;
and calculating the brightness value of the first source image in the calibration environment according to each product, the brightness stimulation value and the target brightness value.
Optionally, calculating a brightness value of the first source image in the calibration environment according to each product, the brightness stimulus value, and the target brightness value, includes:
summing each product to obtain a first sum;
calculating sum values of brightness stimulation values respectively corresponding to the three primary colors to obtain second sum values;
taking the product of the ratio of the first sum value to the second sum value and the target brightness value as the brightness value of the first source image in the calibration environment;
calculating a brightness gain parameter of the detection area relative to the calibration detection area according to the first brightness value, the second brightness value and the brightness value of the first source image in the calibration environment, including:
calculating a brightness difference value between the first brightness value and the second brightness value;
and taking the ratio of the brightness value of the first source image in the calibration environment to the brightness difference value as a brightness gain parameter.
Optionally, obtaining an area-affecting parameter includes:
acquiring a first area value of an uncorrected projection image;
acquiring a calibration area value;
and calculating the ratio of the first area value to the calibration area value to obtain the area influence parameter.
Optionally, obtaining the brightness gain parameter and the area influence parameter includes:
judging whether the storage device stores a brightness gain parameter and an area influence parameter, wherein the brightness gain parameter and the area influence parameter are stored by the projection device at a first projection position;
and under the condition that the projection position of the projection equipment is not changed relative to the first projection position, acquiring the brightness gain parameter and the area influence parameter which are stored by the storage equipment.
Optionally, calculating a target ambient light brightness value based on the brightness gain parameter, the area impact parameter, the first source image, and the first brightness value, includes:
and calculating the product of the brightness gain parameter, the area influence parameter and the first brightness value, and taking the difference value of the product and the brightness value of the first source image in the calibration environment as the brightness value of the target environment.
According to a second aspect of the embodiments of the present disclosure, there is provided a brightness adjustment device for a projection image, applied to a projection apparatus, the device including:
the first acquisition module is used for recording a first source image corresponding to the detection area under the condition that the detection area of the projection area is covered with a projection image, and acquiring the brightness value of the detection area to obtain a first brightness value;
the second acquisition module is used for acquiring a brightness gain parameter and an area influence parameter, the brightness gain parameter is used for describing the difference between the gain of the projection area to the light brightness and the gain of the calibration projection area to the light brightness, the calibration projection area is a projection area under a calibration environment, and the area influence parameter is used for describing the difference between the area of an uncorrected projection image and the calibration area;
the brightness calculation module is used for calculating a target environment light brightness value based on the brightness gain parameter, the area influence parameter, the first source image and the first brightness value;
and the brightness adjusting module is used for adjusting the brightness of the projection image output by the projection equipment according to the target environment light brightness value and the incidence relation between the environment light brightness value and the projection equipment output brightness value, wherein the incidence relation is determined in a calibration environment.
Optionally, a brightness gain parameter determining module is further included, configured to determine a brightness gain parameter, where the brightness gain parameter determining module includes:
the first obtaining submodule is used for obtaining the brightness value of the detection area under the condition that the detection area does not cover the projection image to obtain a second brightness value;
the first calculation submodule is used for calculating the brightness value of the first source image in the calibration environment according to brightness reference parameters, the brightness reference parameters comprise a target brightness value when a calibration detection area displays a white picture and a brightness stimulation value when the calibration detection area displays optical three primary colors, and the calibration detection area is a detection area of the projection equipment in the calibration environment;
and the second calculation submodule is used for calculating the brightness gain parameter according to the first brightness value, the second brightness value and the brightness value of the first source image in the calibration environment.
Optionally, the first computation submodule includes:
the first calculating subunit is used for calculating the average value of the R channels, the average value of the G channels and the average value of the B channels of all the pixel points in the first source image;
the second calculating subunit is used for calculating the product of the average value of each channel and the brightness stimulation value of the corresponding optical primary color;
and the third calculating subunit is used for calculating the brightness value of the first source image in the calibration environment according to each product, the brightness stimulation value and the target brightness value.
Optionally, the third computing subunit is configured to sum each product to obtain a first sum; calculating sum values of brightness stimulation values respectively corresponding to the three primary colors to obtain second sum values; taking the product of the ratio of the first sum value to the second sum value and the target brightness value as the brightness value of the first source image in the calibration environment;
a second calculation submodule for:
calculating a brightness difference value between the first brightness value and the second brightness value; and taking the ratio of the brightness value of the first source image in the calibration environment to the brightness difference value as a brightness gain parameter.
Optionally, the apparatus further includes an area influence parameter obtaining module, configured to obtain an area influence parameter, where the area influence parameter determining module includes: :
a second acquisition sub-module for acquiring a first area value of the uncorrected projection image;
the third obtaining submodule is used for obtaining a calibration area value;
and the third calculation submodule is used for calculating the ratio of the first area value to the calibration area value to obtain the area influence parameter.
Optionally, the second obtaining module further includes:
the judgment submodule is used for judging whether the storage device stores the brightness gain parameter and the area influence parameter, and the brightness gain parameter and the area influence parameter are stored by the projection device at the first projection position;
and the fourth obtaining submodule is used for obtaining the brightness gain parameter and the area influence parameter which are stored in the storage device under the condition that the projection position of the projection device is not changed relative to the first projection position.
Optionally, the brightness calculation module is configured to calculate a product of the brightness gain parameter, the area influence parameter, and the first brightness value, and use a difference between the product and a brightness value of the first source image in the calibration environment as a target environment light brightness value.
According to a third aspect of embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any one of the methods of the first aspect described above.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a projection apparatus including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any of the first aspects above.
According to the technical scheme, under the condition that the projection image covers the detection area of the projection area, the first source image corresponding to the detection area is recorded, the brightness value of the detection area is obtained, and the first brightness value is obtained. In this way, the target ambient light brightness value can be calculated by obtaining the brightness gain parameter and the area influence parameter, and based on the brightness gain parameter, the area influence parameter, the first source image and the first brightness value. Therefore, the brightness of the projection image output by the projection equipment can be adjusted according to the target environment light brightness value and the incidence relation (determined in a calibration environment) between the environment light brightness value and the projection equipment output brightness value.
That is to say, when the above-mentioned technical scheme is obtaining the ambient light brightness, the influence of different projection areas on the brightness gain of light and the influence of different projection areas on the brightness of projection imaging have still been considered to can promote the computational accuracy of ambient light brightness, and then help promoting projection equipment's automatic brightness adjustment's the degree of accuracy.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flowchart illustrating a method for adjusting brightness of a projected image according to an exemplary embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a projection area and a detection area according to an exemplary embodiment of the disclosure.
FIG. 3 is a schematic diagram of a projection scene shown in an exemplary embodiment of the present disclosure.
Fig. 4 is a flowchart illustrating a luminance gain parameter calculation according to an exemplary embodiment of the disclosure.
FIG. 5 is a flowchart illustrating the calculation of an area impact parameter according to an exemplary embodiment of the present disclosure.
Fig. 6 is a block diagram of a brightness adjustment apparatus for a projected image according to an exemplary embodiment of the present disclosure.
Fig. 7 is a block diagram of an electronic device shown in an exemplary embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Before describing the method, the apparatus, the storage medium, and the projection apparatus for adjusting the brightness of a projected image of the present disclosure, an application scenario of the present disclosure will be described first. Embodiments provided by the present disclosure may be used to automatically adjust the brightness of an image projected by a projection device.
The projection device can be imaged by diffuse reflection and is therefore easily disturbed by ambient light, which also makes the placement of the sensors for brightness detection difficult. When the sensor is directed to the user side, if the user turns on the light source only on the projection side, it may result in no light on the user side. In this case, the actual projected picture may be brighter even if the sensor detects a lower brightness. When the sensor is oriented over the projection device, the user's light source may be directed at the sensor. In this case, the sensor may detect that the brightness is high even if the projected picture is dark. When the sensor faces the wall, the sensor is again susceptible to the light of the projection device itself, for example, when the projection image changes continuously, the detection result may be a continuously changing value.
In some scenes, the brightness of the projection equipment in different directions can be detected by arranging a plurality of groups of sensors, so that the accuracy of the detection result is improved. However, this approach also leads to an increase in the cost of the sensor and a more complex algorithm. In other scenes, the accuracy of the detection result can be improved by filtering the projection light, but because different projection planes have different gains for the light, the accurate ambient brightness detection result is difficult to obtain in such a way.
Therefore, the present disclosure provides a method for adjusting the brightness of a projected image, which is applied to a projection device. Fig. 1 is a flowchart illustrating a method for adjusting brightness of a projected image according to the present disclosure, the method including:
in step 11, in the case that the detection area of the projection area is covered with the projection image, a first source image corresponding to the detection area is recorded, and the brightness value of the detection area is acquired, resulting in a first brightness value.
Here, the projection area may refer to an area where an image is displayed when the projection apparatus projects the image. When the projection device projects a source image, a corresponding projection image may be formed at the projection area. Wherein the first source image satisfies: when the first source image is projected, the imaging area is the detection area.
The detection area may be arranged, for example, in the detection area range of the associated brightness detection means. The detection area range may be an area surrounded by a cross-sectional line formed when the three-dimensional detection area of the brightness detection device intersects with a plane where the projection area is located. The luminance detection means may be, for example, a light ray sensor, a color temperature sensor (Y channel), or the like. Referring to fig. 2, a schematic diagram of a projection area and a detection area is shown, in which the detection area may be included in the projection area.
In order to improve the detection accuracy, in some implementation scenarios, the detection area may be set within an image use range of the projection device, so that a projection image of the projection device can always cover the detection area. For example, when the image of the projection device is used in an area within plus or minus 5 degrees from the normal, the position of the detection area may be determined by calculation or actual measurement. In addition, the area of the detection region can be set to be larger (e.g., the largest) under the condition that the detection region is within the image use range of the projection apparatus, thereby contributing to the improvement of the detection accuracy.
In this way, in the case where the detection area of the projection area is covered with the projection image, the first luminance value of the detection area can be acquired by the associated luminance detection means.
In step 12, a luminance gain parameter and an area impact parameter are obtained.
It is worth noting that the gain to the brightness of the light may be different for different projection areas. Compared with the projection area of a white wall, when light with the same intensity is projected on the gain curtain, the brightness detection device can detect a higher brightness value. That is, the brightness gain of the projection area also affects the brightness detection result.
In the embodiment, a brightness gain parameter is introduced, and the brightness gain parameter is used for describing the difference between the gain of the projection area to the light brightness and the gain of the calibration projection area to the light brightness. The calibration projection area is a projection area in a calibration environment, and the manner of obtaining the brightness gain parameter will be described in the following embodiments.
In addition, reference is made to a schematic illustration of a projection scenario shown in fig. 3. In general, the trapezoidal corrected projected image (illustrated at 302) may be part of the actual light exposure area (illustrated at 301) of the projection device. However, since the luminous flux of the projection device is constant, the brightness of the diffuse reflection light is correlated with the actual light irradiation area of the projection device. Therefore, the area influence parameter is also introduced in the embodiment, so that the influence of the area of the projected image on the calculation of the ambient light brightness is considered. Wherein the area influencing parameter is used to describe the difference between the area of the uncorrected projected image and the nominal area.
In step 13, a target ambient light brightness value is calculated based on the brightness gain parameter, the area impact parameter, the first source image, and the first brightness value.
In one possible embodiment, the luminance value of the first source image in the calibration environment may be calculated according to the luminance reference parameter. In this way, the product of the brightness gain parameter, the area influence parameter and the first brightness value may be calculated, and the difference between the product and the brightness value of the first source image in the calibration environment is used as the target environment light brightness value, and the specific calculation process will be described in the following examples of the present disclosure.
In step 14, the brightness of the projection image output by the projection device is adjusted according to the target ambient light brightness value and the correlation between the ambient light brightness value and the projection device output brightness value.
Wherein the association relationship may be determined in a calibration environment. For example, the correlation may be obtained by changing the brightness of the ambient light from dark to light in an experimental environment and determining the output brightness value of the corresponding projection device according to the human senses. Therefore, the incidence relation can be searched based on the target environment light brightness value, the corresponding target output brightness value is obtained, the projection equipment is controlled to project the source image according to the target output brightness value, and therefore the brightness adjustment of the projected image is achieved.
According to the technical scheme, under the condition that the projection image covers the detection area of the projection area, the first source image corresponding to the detection area is recorded, the brightness value of the detection area is obtained, and the first brightness value is obtained. In this way, the target ambient light brightness value can be calculated by obtaining the brightness gain parameter and the area influence parameter, and based on the brightness gain parameter, the area influence parameter, the first source image and the first brightness value. Therefore, the brightness of the projection image output by the projection equipment can be adjusted according to the target environment light brightness value and the incidence relation (determined in a calibration environment) between the environment light brightness value and the projection equipment output brightness value.
That is to say, when the above-mentioned technical scheme is obtaining the ambient light brightness, the influence of different projection areas on the brightness gain of light and the influence of different projection areas on the brightness of projection imaging have still been considered to can promote the computational accuracy of ambient light brightness, and then help promoting projection equipment's automatic brightness adjustment's the degree of accuracy.
The following is an exemplary description of the manner of obtaining the luminance gain parameter, and fig. 4 is a flowchart illustrating a calculation process of the luminance gain parameter, which includes:
in step 41, if the detection area does not cover the projection image, the luminance value of the detection area is acquired, and a second luminance value is obtained.
For example, the second luminance value of the detection region may be acquired before the projection device is not lit up or during a blank screen blank period of the projection device (e.g., a blank period when an application is switched, a blank period when a screen source is switched, or the like).
In step 42, the brightness value of the first source image in the calibration environment is calculated according to the brightness reference parameter.
The brightness reference parameter may include a target brightness value when the calibration detection area displays a white picture, and a brightness stimulus value when the calibration detection area displays three primary colors, where the calibration detection area is a detection area of the projection device in a calibration environment.
For example, the luminance reference parameter may be specified under a darkroom environment. When calibrating, the projection area can be a white wall or a white curtain, for example, and a calibration detection area is set in the projection area. Therefore, a 100% white picture corresponding to the calibration detection area can be projected, and the brightness value at the moment can be recorded to obtain the target brightness value. In addition, it is also possible to project a 100% red picture, a 100% green picture, and a 100% blue picture corresponding to the calibration detection area, and detect XYZ tristimulus values of the respective pictures, respectively. The Y channel value is taken as the luminance stimulus value to obtain the luminance stimulus value YR of the red channel, the luminance stimulus value YG of the green channel, and the luminance stimulus value YB of the blue channel.
In this way, the brightness value of the first source image in the calibration environment can be calculated according to the brightness reference parameter.
For example, in one possible embodiment, the luminance value of the first source image in the calibration environment may be calculated as follows:
and calculating the average value of the R channels, the average value of the G channels and the average value of the B channels of all the pixel points in the first source image. It should be appreciated that each pixel point in the first source image may have a value of R, G, B, and thus the R-channel average, G-channel average, and B-channel average may be calculated for all pixel points in the first source image.
For example, in the case where the number of channel bits is 8 bits, the average value of each channel can be calculated by the following calculation formula:
wherein Num is the number value of the pixel points. Of course, when the number of channel bits is 10 bits, 255 in the above calculation formula may be replaced by 1023, which is not limited by the present disclosure.
After obtaining the average values for the individual channels, the product of each channel average value and the luminance stimulus value of the corresponding optical primary color can be calculated. In this way, the brightness value of the first source image in the calibration environment can be calculated according to each product, the brightness stimulation value and the target brightness value. For example, each product may be summed to obtain a first sum, and the sum of the luminance stimulus values corresponding to the three primary colors of light may be calculated to obtain a second sum. In this way, the product of the ratio of the first sum value to the second sum value and the target brightness value can be used as the brightness value of the first source image in the calibration environment.
Continuing with the above example, the first Sum Sum1Can be as follows:
Sum1＝RAvg×YR+GAvg×YG+BAvg×YB
the second Sum2 may be expressed as: sum2 ═ YR + YG + YB. The luminance value L of the first source image in the calibration environment may be:
wherein R isAvgAs red channel average, GAvgAs green channel average, BAvgIs the blue channel average value, Lb is the target luminance value.
In step 43, a brightness gain parameter is calculated according to the first brightness value, the second brightness value and the brightness value of the first source image in the calibration environment.
It should be noted that, when the brightness gains of the detection area and the calibration detection area for the light are the same, the following relation can be satisfied:
here, Lt is the second luminance value, and Ld is the first luminance value.
When the above relation is not satisfied, it may be determined that the brightness gain degrees of the light in the detection area and the calibration detection area are different, and at this time, the brightness value detected in the detection area needs to be compensated. For example, it is possible to introduce a calculation brightness gain parameter β to compensate for the brightness value detected in the detection area.
In some implementation scenarios, a brightness difference between the second brightness value and the first brightness value may be calculated, and a ratio of the brightness value of the first source image in the calibration environment to the brightness difference may be used as the brightness gain parameter.
Following the above example, the luminance gain parameter β may be:
the projection image brightness adjustment method of the present disclosure is exemplarily described below with reference to the above calculation formula. When the detection area is the gain curtain and the calibration detection area is a white wall, the light with the same intensity can obtain larger brightness gain in the gain curtain. In this case, the brightness detection of the detection area in the gain curtain can obtain a larger brightness value, so that the brightness value of the ambient light obtained by subsequent calculation is also larger. That is, the brightness value of the ambient light obtained by the projection device is greater than the actual brightness value of the ambient light, so that the projection device may further increase the brightness of the projected image, and finally the brightness of the projected image continues to increase.
By adopting the technical scheme of the application, when the gain of the detection area to the light is larger than the gain of the calibration detection area to the light, Lt-Ld (namely the brightness value when the source image is displayed in the detection area) is larger than the brightness value L when the source image is displayed in the calibration detection area, and at the moment, beta is less than 1. In this way, the acquired brightness value is compensated (for example, a product is calculated) by the brightness gain parameter, and the detection accuracy of the ambient light brightness can be improved.
According to the technical scheme, when the projection image projected by the projection equipment covers the detection area, the corresponding first source image can be obtained, and the first brightness value of the detection area at the moment is recorded. In this way, the brightness value of the first source image in the calibration environment can be determined based on the brightness reference parameter calibrated in the calibration environment. Since the difference between the first brightness value and the second brightness value can represent the brightness of the first source image in the detection region, the brightness gain parameter of the detection region relative to the calibration detection region can be calculated based on the first brightness value, the second brightness value and the brightness value of the first source image in the calibration environment. Therefore, the brightness of the light rays measured in the detection area can be compensated based on the brightness gain parameters, so that the interference of different projection planes to the ambient brightness detection process can be reduced. That is to say, above-mentioned technical scheme can promote the detection accuracy degree of ambient brightness, therefore helps promoting projection equipment's automatic brightness control's the degree of accuracy.
The following is an exemplary illustration of the manner of obtaining the area influence parameter, and fig. 5 is a flowchart illustrating a calculation process of the area influence parameter, where the calculation process includes:
s51, a first area value of the uncorrected projection image is acquired.
Referring to fig. 3, since the luminous flux of the projection apparatus is constant, the brightness of the diffuse reflection light is associated with the actual light irradiation area of the projection apparatus. Thus, the first area value is calculated with the uncorrected projection image in this embodiment.
As for the first area value, in a specific implementation, sensors such as a keystone correction module of the projection apparatus, a keystone correction equipped camera, and a TOF (Time of flight) may be used to calculate a deflection angle of the projection apparatus and a distance from the projection area to the projection apparatus. In this way, the entire spatial coordinate system can be calculated in combination with the compensation of the optical machine and the throw ratio to calculate the coordinates of the four vertices of the projected image, and the first area value of the uncorrected projected image can be calculated from the coordinates of the four vertices. For the calculation process of the vertex and the area of the projection image, please refer to the description of the related art, which is not described in detail in this disclosure.
And S52, acquiring a calibration area value. The calibration area value may also be one of the luminance reference parameters, which may be determined during the calibration phase. For example, during calibration, the projection apparatus may be controlled to project a standard rectangular frame without turning on keystone correction and zooming, and the size is not limited (generally, between 60 and 100 inches), and the projected image area value at this time is the calibrated area value. It should be noted that, in this case, parameters such as the target brightness value, the brightness stimulus value, and the like need to be calibrated on the basis of the calibrated area value.
And S53, calculating the ratio of the first area value to the calibration area value to obtain the area influence parameter.
In this way, by introducing the area influence parameter, the method for adjusting the brightness of the projected image according to the present disclosure also considers the influence of the area of the projected image on the calculation of the brightness of the environment light when calculating the brightness of the environment light. For example, when the light brightness of the projection device itself is filtered, if the influence of the area of the projected image on the calculation of the ambient light brightness is not considered, a large error may exist in the filtering process. Therefore, the technical scheme is helpful for improving the accuracy of the brightness adjustment of the projected image.
The following is an exemplary illustration of the calculation process of the target ambient light brightness value of the present disclosure, and in some implementation scenarios, the calculating the target ambient light brightness value based on the brightness gain parameter, the area impact parameter, the first source image, and the first brightness value (step 13) in fig. 1 may include:
and calculating the brightness value of the first source image in the calibration environment according to the brightness reference parameter. And calculating the product of the brightness gain parameter, the area influence parameter and the first brightness value, and taking the difference value of the product and the brightness value of the first source image in the calibration environment as the brightness value of the target environment.
The calculation formula is used to calculate the ambient light luminance value Lr
Where α is an area-influencing parameter, Lc is a first luminance value, RAvgIs the average value of the red channel of the first source image, GAvgIs the green channel average of the first source image, BAvgIs the blue channel average of the first source image.
According to the technical scheme, the influence of the projection plane on the gain of light is considered when the ambient light brightness is detected, and the influence of the light of the projection image and the influence of the projection area on the brightness of the projection image are also considered. Therefore, the detected brightness value is compensated through the brightness gain parameter, the light influence of the projected image is filtered, and the more accurate environment light brightness value can be obtained through the technical scheme. On the basis, the technical scheme is also favorable for improving the accuracy of automatic brightness adjustment of the projection equipment.
It is worth noting that the process of calculating the luminance gain parameter need not be repeated. For example, the projection device may calculate and store the brightness gain parameter each time it is turned on, and may directly apply the stored brightness gain parameter in the subsequent brightness adjustment process. The brightness gain parameter may also be kept constant in case the position of the projection device is not changed.
Therefore, in one possible implementation, the obtaining of the luminance gain parameter and the area influence parameter in fig. 1 includes:
and judging whether the storage device stores the brightness gain parameter and the area influence parameter, wherein the brightness gain parameter and the area influence parameter are stored by the projection device at the first projection position.
The storage device may be a local storage medium of the projection device or a cloud storage device associated with the projection device. The projection device may calculate the brightness gain parameter and the area impact parameter at the first projection position and store the parameters in the storage device.
And under the condition that the projection position of the projection equipment is not changed relative to the first projection position, acquiring the brightness gain parameter and the area influence parameter which are stored by the storage equipment. In this way, when the position of the projection device is not changed, the brightness value of the ambient light can be calculated based on the saved brightness gain parameter and the area influence parameter, so that the calculation amount of the projection device can be reduced, and the reduction of power consumption is facilitated.
In addition, when the position of the projection device is changed, the brightness gain parameter and the area effect parameter may be recalculated.
For example, the position information of the projection device may be obtained, and when the position information indicates that the position of the projection device changes, it is determined that the detection area changes. Here, the position information of the projection apparatus may be acquired based on a detection element such as a gyroscope, an acceleration sensor, or the like. When the data acquired by the detection elements indicates that the position of the projection device changes, the detection area of the projection device may also change. Therefore, the luminance gain parameter needs to be recalculated in this case.
In some embodiments, the change in the position of the projection device may also be determined in response to receiving an instruction from a user that characterizes the change in the position of the projection device. For example, a user may send an instruction to the projection device to indicate that the location of the projection device has changed after moving the projection device. The instruction may be sent to the projection device by the user based on the mobile terminal, or may be generated by the projection device in response to an operation of the projection device by the user, which is not limited in this disclosure.
Thus, by adopting the technical scheme, the brightness gain parameter and the area influence parameter can be recalculated after the detection area is determined to be changed. Through the mode, the accuracy of the brightness gain parameter and the area influence parameter is favorably ensured, and the accuracy of brightness adjustment of the projection equipment is favorably improved.
Based on the same inventive concept, the disclosure also provides a projection image brightness adjusting device, which is applied to projection equipment. Fig. 6 is a block diagram of a device for adjusting brightness of a projected image, shown in the present disclosure, the device 600 includes:
a first obtaining module 601, configured to record a first source image corresponding to a detection area under a condition that the detection area of the projection area is covered with a projection image, and obtain a brightness value of the detection area to obtain a first brightness value;
a second obtaining module 602, configured to obtain a brightness gain parameter and an area influence parameter, where the brightness gain parameter is used to describe a difference between a gain of a projection region to light brightness and a gain of a calibration projection region to light brightness, the calibration projection region is a projection region in a calibration environment, and the area influence parameter is used to describe a difference between an area of an uncorrected projected image and a calibration area;
a brightness calculation module 603, configured to calculate a target ambient light brightness value based on the brightness gain parameter, the area impact parameter, the first source image, and the first brightness value;
the brightness adjusting module 604 is configured to adjust the brightness of the projection image output by the projection device according to the target ambient light brightness value and an association relationship between the ambient light brightness value and the projection device output brightness value, where the association relationship is determined in a calibration environment.
According to the technical scheme, under the condition that the projection image covers the detection area of the projection area, the first source image corresponding to the detection area is recorded, the brightness value of the detection area is obtained, and the first brightness value is obtained. In this way, the target ambient light brightness value can be calculated by obtaining the brightness gain parameter and the area influence parameter, and based on the brightness gain parameter, the area influence parameter, the first source image and the first brightness value. Therefore, the brightness of the projection image output by the projection equipment can be adjusted according to the target environment light brightness value and the incidence relation (determined in a calibration environment) between the environment light brightness value and the projection equipment output brightness value.
That is to say, when the above-mentioned technical scheme is obtaining the ambient light brightness, the influence of different projection areas on the brightness gain of light and the influence of different projection areas on the brightness of projection imaging have still been considered to can promote the computational accuracy of ambient light brightness, and then help promoting projection equipment's automatic brightness adjustment's the degree of accuracy.
The first obtaining submodule is used for obtaining the brightness value of the detection area under the condition that the detection area does not cover the projection image to obtain a second brightness value;
the first calculation submodule is used for calculating the brightness value of the first source image in the calibration environment according to brightness reference parameters, the brightness reference parameters comprise a target brightness value when a calibration detection area displays a white picture and a brightness stimulation value when the calibration detection area displays optical three primary colors, and the calibration detection area is a detection area of the projection equipment in the calibration environment;
and the second calculation submodule is used for calculating the brightness gain parameter according to the first brightness value, the second brightness value and the brightness value of the first source image in the calibration environment.
Optionally, the first computation submodule includes:
the first calculating subunit is used for calculating the average value of the R channels, the average value of the G channels and the average value of the B channels of all the pixel points in the first source image;
the second calculating subunit is used for calculating the product of the average value of each channel and the brightness stimulation value of the corresponding optical primary color;
and the third calculating subunit is used for calculating the brightness value of the first source image in the calibration environment according to each product, the brightness stimulation value and the target brightness value.
Optionally, the third computing subunit is configured to sum each product to obtain a first sum; calculating sum values of brightness stimulation values respectively corresponding to the three primary colors to obtain second sum values; taking the product of the ratio of the first sum value to the second sum value and the target brightness value as the brightness value of the first source image in the calibration environment;
a second calculation submodule for:
calculating a brightness difference value between the first brightness value and the second brightness value; and taking the ratio of the brightness value of the first source image in the calibration environment to the brightness difference value as a brightness gain parameter.
Optionally, the apparatus further includes an area influence parameter obtaining module, configured to obtain an area influence parameter, where the area influence parameter determining module includes: :
a second acquisition sub-module for acquiring a first area value of the uncorrected projection image;
the third obtaining submodule is used for obtaining a calibration area value;
and the third calculation submodule is used for calculating the ratio of the first area value to the calibration area value to obtain the area influence parameter.
Optionally, the second obtaining module further includes:
the judgment submodule is used for judging whether the storage device stores the brightness gain parameter and the area influence parameter, and the brightness gain parameter and the area influence parameter are stored by the projection device at the first projection position;
and the fourth obtaining submodule is used for obtaining the brightness gain parameter and the area influence parameter which are stored in the storage device under the condition that the projection position of the projection device is not changed relative to the first projection position.
Optionally, the brightness calculation module is configured to calculate a product of the brightness gain parameter, the area influence parameter, and the first brightness value, and use a difference between the product and a brightness value of the first source image in the calibration environment as a target environment light brightness value.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The present disclosure also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the projected image brightness adjustment method provided by the present disclosure.
The present disclosure also provides a projection device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the projected image brightness adjustment method provided by the present disclosure.
Fig. 7 is a block diagram illustrating an electronic device 700, which may be configured as a projection device, for example, in accordance with an exemplary embodiment. As shown in fig. 7, the electronic device 700 may include: a processor 701 and a memory 702. The electronic device 700 may also include one or more of a multimedia component 703, an input/output (I/O) interface 704, and a communication component 705.
The processor 701 is configured to control the overall operation of the electronic device 700, so as to complete all or part of the steps in the above-mentioned method for adjusting the brightness of the projected image. The memory 702 is used to store various types of data to support operation of the electronic device 700, such as instructions for any application or method operating on the electronic device 700 and application-related data, such as messaging, pictures, audio, video, and the like. The Memory 702 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia components 703 may include screen and audio components. Wherein the screen may be, for example, a touch screen and the audio component is used for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may further be stored in the memory 702 or transmitted through the communication component 705. The audio assembly also includes at least one speaker for outputting audio signals. The I/O interface 704 provides an interface between the processor 701 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is used for wired or wireless communication between the electronic device 700 and other devices. Wireless Communication, such as Wi-Fi, bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, which is not limited herein. The corresponding communication component 705 may thus include: Wi-Fi module, Bluetooth module, NFC module, etc.
In an exemplary embodiment, the electronic Device 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-described method for adjusting the brightness of the projected image.
In another exemplary embodiment, there is also provided a computer readable storage medium including program instructions which, when executed by a processor, implement the steps of the projected image brightness adjustment method described above. For example, the computer readable storage medium may be the memory 702 described above including program instructions that are executable by the processor 701 of the electronic device 700 to perform the projected image brightness adjustment method described above.
In another exemplary embodiment, a computer program product is also provided, which comprises a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-mentioned projection image brightness adjustment method when executed by the programmable apparatus.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A method for adjusting the brightness of a projected image is applied to a projection device, and comprises the following steps:
under the condition that a projection image covers a detection area of a projection area, recording a first source image corresponding to the detection area, and acquiring a brightness value of the detection area to obtain a first brightness value;
acquiring a brightness gain parameter and an area influence parameter, wherein the brightness gain parameter is used for describing the difference between the gain of the projection area to the light brightness and the gain of the calibration projection area to the light brightness, the calibration projection area is a projection area under a calibration environment, and the area influence parameter is used for describing the difference between the area of the projected image which is not corrected and the calibration area;
calculating a target ambient light brightness value based on the brightness gain parameter, the area impact parameter, the first source image, and the first brightness value;
and adjusting the brightness of the projection image output by the projection equipment according to the target environment light brightness value and the incidence relation between the environment light brightness value and the projection equipment output brightness value, wherein the incidence relation is determined in a calibration environment.
2. The method of claim 1, wherein obtaining a brightness gain parameter comprises:
under the condition that the detection area does not cover the projection image, acquiring a brightness value of the detection area to obtain a second brightness value;
calculating the brightness value of the first source image in a calibration environment according to brightness reference parameters, wherein the brightness reference parameters comprise a target brightness value when a calibration detection area displays a white picture and a brightness stimulation value when the calibration detection area displays three primary colors, and the calibration detection area is a detection area of the projection equipment in the calibration environment;
and calculating the brightness gain parameter according to the first brightness value, the second brightness value and the brightness value of the first source image in a calibration environment.
3. The method of claim 2, wherein the calculating the brightness value of the first source image in the calibration environment according to the brightness reference parameter comprises:
calculating the average value of R channels, the average value of G channels and the average value of B channels of all pixel points in the first source image;
calculating the product of the average value of each channel and the brightness stimulation value of the corresponding optical primary color;
and calculating the brightness value of the first source image in the calibration environment according to each product, the brightness stimulation value and the target brightness value.
4. The method of claim 3, wherein said calculating a brightness value of said first source image in a calibration environment from each of said product, said brightness stimulus value, and said target brightness value comprises:
summing each of said products to obtain a first sum;
calculating sum values of brightness stimulation values respectively corresponding to the three primary colors to obtain second sum values;
taking the product of the ratio of the first sum value to the second sum value and the target brightness value as the brightness value of the first source image in a calibration environment;
the calculating the brightness gain parameter of the detection area relative to the calibration detection area according to the first brightness value, the second brightness value and the brightness value of the first source image in the calibration environment includes:
calculating a brightness difference value between the first brightness value and the second brightness value;
and taking the ratio of the brightness value of the first source image in the calibration environment to the brightness difference value as the brightness gain parameter.
5. The method of claim 1, wherein obtaining area impact parameters comprises:
acquiring a first area value of an uncorrected projection image;
acquiring a calibration area value;
and calculating the ratio of the first area value to the calibration area value to obtain the area influence parameter.
6. The method of claim 1, wherein obtaining the luminance gain parameter and the area impact parameter comprises:
judging whether a storage device stores a brightness gain parameter and an area influence parameter, wherein the brightness gain parameter and the area influence parameter are stored by the projection device at a first projection position;
and under the condition that the projection position of the projection equipment is not changed relative to the first projection position, acquiring the brightness gain parameter and the area influence parameter which are stored by the storage equipment.
7. The method of any of claims 1-6, wherein computing a target ambient light brightness value based on the brightness gain parameter, the area impact parameter, the first source image, and the first brightness value comprises:
and calculating the product of the brightness gain parameter, the area influence parameter and the first brightness value, and taking the difference value of the product and the brightness value of the first source image in the calibration environment as the brightness value of the target environment.
8. A projection image brightness adjusting device is applied to a projection device, and the device comprises:
the device comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for recording a first source image corresponding to a detection area under the condition that the detection area of a projection area is covered with a projection image, and acquiring the brightness value of the detection area to obtain a first brightness value;
the second obtaining module is used for obtaining a brightness gain parameter and an area influence parameter, wherein the brightness gain parameter is used for describing the difference between the gain of the projection area to the light brightness and the gain of the calibration projection area to the light brightness, the calibration projection area is a projection area under a calibration environment, and the area influence parameter is used for describing the difference between the area of the projected image which is not corrected and the calibration area;
a brightness calculation module for calculating a target ambient light brightness value based on the brightness gain parameter, the area impact parameter, the first source image and the first brightness value;
and the brightness adjusting module is used for adjusting the brightness of the projection image output by the projection equipment according to the target environment light brightness value and the incidence relation between the environment light brightness value and the projection equipment output brightness value, wherein the incidence relation is determined in a calibration environment.
9. A non-transitory computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
10. A projection device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 7.
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