WO2014201813A1

WO2014201813A1 - Luminance detection and correction method and system of projector

Info

Publication number: WO2014201813A1
Application number: PCT/CN2013/089096
Authority: WO
Inventors: 蔡才冠; 马先
Original assignee: 广东威创视讯科技股份有限公司
Priority date: 2013-06-20
Filing date: 2013-12-11
Publication date: 2014-12-24
Also published as: CN103323218A; CN103323218B

Abstract

Provided is a luminance detection and correction method of a projector, comprising: acquiring an initial luminance estimation model of the projector, the initial luminance estimation model comprising current values and corresponding luminance estimation intervals (S11); performing luminance detection many times with a preset current adjustment value, to obtain multiple corresponding luminance adjustment values, and evaluating an average value of the multiple luminance adjustment values (S12); comparing the average value of the multiple luminance adjustment values with a midpoint value of the luminance estimation interval corresponding to the current adjustment value in the initial luminance estimation model, to obtain an adjustment error (S13); adjusting, according to the adjustment error, the luminance estimation intervals corresponding to the current values in the initial luminance estimation model, to obtain an adjusted luminance estimation model (S14); and correcting a detected luminance value and then outputting a corrected value according to the adjusted luminance estimation model (S15). Also provided is a luminance detection and correction system of a projector, which can correct a luminance value detected by a luminance sensor in the projector and output a high-precision luminance value.

Description

Projector brightness detection correction method and system

The invention relates to the technical field of brightness adjustment of a projector, in particular to a brightness detection and correction method of a projector, and a brightness detection and correction system of the projector. Background technique

The projector can project an image or video output through an LED (Light Emitting Diode) light source. Brightness is a fundamental property of LED projectors. Severe brightness deviations can result in dark, bright or color casts. Obtaining the brightness of the projector through the brightness sensor is a common method, but the brightness estimated by the brightness sensor is inaccurate with the actual brightness of the projector, and the brightness estimation accuracy of different brightness sensors is different. The higher the accuracy, the more the brightness sensor There is an error in the brightness detection result of the LED projector, and some errors reach ± 2% or more, that is, the same current value and the same brightness, the maximum and minimum brightness values obtained by the brightness sensor at different times have an error of about 4%. This brings great problems to the brightness detection of LED projectors. The result of excessive brightness detection makes many projectors based on brightness perform poorly. Summary of the invention

Based on this, the present invention provides a brightness detection correction method and system for a projector, which can correct a brightness value measured by a brightness sensor in a projector, and output a brightness value with high precision.

A method for correcting brightness detection of a projector includes the following steps:

Acquiring an initial brightness estimation model of the projector, wherein the initial brightness estimation model includes respective current values and corresponding brightness estimation intervals thereof;

Performing multiple brightness detections under the preset adjustment current value to obtain corresponding multiple adjusted brightness values, and obtaining an average value of the plurality of adjusted brightness values;

Comparing an average value of the plurality of adjusted brightness values with a magnitude of a midpoint value of the brightness estimation interval corresponding to the adjusted current value in the initial brightness estimation model, to obtain an adjustment error;

Adjusting, according to the adjustment error, a brightness estimation interval corresponding to each current value in the initial brightness estimation model, To the adjusted brightness estimation model;

According to the adjusted brightness estimation model, the detected brightness value is corrected and output.

A brightness detection correction system for a projector, comprising:

An obtaining module, configured to acquire an initial brightness estimation model of the projector, where the initial brightness estimation model includes respective current values and corresponding brightness estimation intervals thereof;

The obtaining module is configured to perform multiple brightness detections under a preset adjustment current value, obtain corresponding multiple adjusted brightness values, and obtain an average value of the plurality of adjusted brightness values;

a comparison module, configured to compare an average value of the plurality of adjusted brightness values with a midpoint value of the brightness estimation interval corresponding to the adjusted current value in the initial brightness estimation model, to obtain an adjustment error;

And an adjustment module, configured to adjust a brightness estimation interval corresponding to each current value in the initial brightness estimation model according to the adjustment error, to obtain an adjusted brightness estimation model;

And an output module, configured to perform correction according to the adjusted brightness estimation model, and output the detected brightness value. The brightness detection correction method and system of the above projector compares the average value of the brightness obtained by performing multiple brightness detections under a preset adjustment current value, and compares the brightness average value with the adjusted current value in the initial brightness estimation model Corresponding brightness value, the initial brightness estimation model with large error is adjusted, and an adjusted brightness estimation model with less error is obtained, and the detected brightness value can be corrected according to the model and output; the invention is based on multiple detection The average brightness is adjusted to the initial brightness estimation model, which effectively reduces the error rate of the brightness estimation, improves the accuracy of the brightness value, and makes the process simple and fast. DRAWINGS

FIG. 1 is a schematic flow chart of a method for correcting brightness detection of a projector according to an embodiment of the present invention.

2 is a schematic diagram of an initial brightness estimation model of FIG. 1.

Figure 3 is a schematic diagram of the single brightness detection and multiple brightness detection errors in Figure 1.

FIG. 4 is a schematic diagram of the adjustment process of the initial brightness estimation model of FIG. 1.

FIG. 5 is a schematic structural view of a brightness detection and correction system of a projector according to an embodiment of the present invention. detailed description

The present invention will be further described in detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto. FIG. 1 is a schematic flow chart of a brightness detection and correction method of a projector according to an embodiment of the present invention, which includes the following steps:

511. Acquire an initial brightness estimation model of the projector, where the initial brightness estimation model includes respective current values and corresponding brightness estimation intervals thereof;

The brightness sensor has an error in estimating the brightness of the LED projector, and some errors are above ± 2%. That is, under the same current value and the same brightness, the maximum and minimum brightness values obtained by the brightness sensor at different times have an error of about 4%, so a certain current value corresponds to a set of brightness values;

The initial brightness estimation model in this embodiment may be obtained according to the historical data collected by the projector, or may be obtained by performing a brightness acquisition test on the projector, and the initial brightness estimation model records a brightness estimation corresponding to each different current value. The interval, as shown in FIG. 2, is a schematic diagram of an initial luminance estimation model obtained, and curves H21 and H22 constitute a luminance estimation interval corresponding to each current value, and the current value between the curves H21 and H22 is The error range of the luminance value detected by the luminance sensor.

In a preferred embodiment, the initial brightness estimation model is a data list, and the data list stores each of the current values and their corresponding maximum initial brightness values and minimum initial brightness values, each of the current values corresponding to The maximum initial luminance value and the minimum initial luminance value constitute a luminance estimation interval corresponding to each of the current values, and the initial luminance estimation model is stored through the data list, and data processing can be performed more quickly. In addition, the initial brightness estimation model can also be set for a graph or by other means such as equations.

512. Perform multiple brightness detections under a preset adjustment current value, obtain corresponding multiple adjusted brightness values, and obtain an average value of the plurality of adjusted brightness values;

Although there is an error in the single brightness sensor estimation, the average value of the brightness estimation will be stable multiple times under the same current value and the same brightness. The average value of the multiple brightness estimation is used as the brightness estimation value than the single brightness estimation value. The accuracy is high, the error is small, and the more the number of times, the smaller the error;

As shown in Fig. 3, in the case of the same current and the same brightness, two broken lines indicate the luminance estimation range H31 of one estimation value; two solid lines indicate the estimated value range H32 of the average of multiple estimation values, so the multiple mean estimation The method can effectively improve the brightness estimation accuracy and reduce the brightness estimation error.

After obtaining the initial brightness estimation model from step S11, since the error of the model is large, it needs to be adjusted to reduce the error; in this step, the brightness sensor is used for multiple brightness detection according to the preset adjustment current value. And obtaining a plurality of adjusted brightness values corresponding to the adjusted current value, and obtaining an average value of the plurality of adjusted brightness values. 513. Compare an average value of the plurality of adjusted brightness values with a midpoint value of the brightness estimation interval corresponding to the adjusted current value in the initial brightness estimation model, to obtain an adjustment error;

Obtaining, from step S12, an average value of the plurality of adjusted brightness values obtained by adjusting the brightness value under the plurality of brightness detections, since the average value of the brightness estimation is used as the brightness estimation value is higher than the single brightness evaluation value, The error is small, and the more the number of times, the smaller the error, so it can be considered that the error of the average value of the plurality of adjusted brightness values obtained under multiple brightness detection is small, and the precision is high;

In the initial brightness estimation model, reading an initial brightness interval corresponding to the preset adjusted brightness value, and finding a midpoint value of the interval, the error of the brightness value is large; due to multiple times obtained under multiple brightness detection The accuracy of adjusting the average value of the brightness value is high, so the adjustment error can be obtained by comparing the sizes of the two;

In a preferred embodiment, the adjustment current value may be obtained by dividing the midpoint value of the corresponding luminance estimation interval in the initial luminance estimation model by the average of the plurality of adjusted luminance values, and the ratio obtained as The adjustment error.

514. Adjust, according to the adjustment error, a brightness estimation interval corresponding to each current value in the initial brightness estimation model, to obtain an adjusted brightness estimation model.

After the adjustment error is obtained in step S13, the brightness estimation interval corresponding to each current value in the initial brightness estimation model is correspondingly adjusted, and the adjusted brightness estimation model is obtained, and the model has higher precision and error than the initial brightness estimation model. Smaller.

In a preferred embodiment, multiplying the maximum initial luminance value and the minimum initial luminance value corresponding to each of the current values in the initial luminance estimation model by the adjustment error to obtain the adjusted luminance estimation model; In step S13, the ratio of the average value obtained by the adjusted current value after the multiple detection to the corresponding brightness value in the initial brightness estimation model is calculated, and the maximum initial brightness corresponding to each current value recorded in the data list is correspondingly correspondingly calculated. Both the value and the minimum initial luminance value are multiplied by the ratio, thereby achieving the purpose of reducing the error of the initial luminance estimation model, and obtaining a higher precision adjusted luminance estimation model.

As shown in FIG. 4, the preset adjustment current value in FIG. 4a is C0, and the midpoint value of the interval is calculated according to the luminance estimation interval of the CO in the initial luminance estimation model (the interval corresponding to CO in the figure [Bl, B2]). , get B0;

Under the adjustment of the current value CO, the brightness is obtained by using the brightness sensor to obtain the average value B_c, as shown in the figure.

As shown in Fig. 4b, the adjustment current value CO has two different brightness values B0 and a brightness value B_c, and the initial brightness estimation model has a certain error with the average value of the multiple detections;

The ratio of B_c divided by B0 is used as the adjustment error, and the initial luminance estimation model is performed (two dotted lines H4bl and H4b2) Adjustment, multiplying the maximum initial brightness value and the minimum initial brightness value corresponding to each current value recorded in the data list by the ratio, and finally obtaining the adjusted brightness estimation model (two solid lines H4b3 and H4b4).

The following table is a list of data that stores four sets of data from the initial luminance estimation model:

In this embodiment, the preset adjustment current value CO is 14 in the above table, and multiple detections are performed, and the calculated average value B_c is 13. In the initial brightness estimation model in the above table, the current value CO is adjusted. The brightness estimation interval is [10, 20], and the midpoint value B0 of the interval is 15, so the adjustment error is 13/15; according to the adjustment error, the maximum initial brightness value corresponding to each current value recorded in the data list is And the minimum initial brightness value is multiplied by the ratio, and finally the adjusted brightness estimation model is as follows:

In this embodiment, the above process states that the preset adjustment current value is one. In fact, the model may be divided into multiple parts according to the initial brightness estimation model, and a plurality of adjustment current values are preset. Each part corresponds to an adjustment current value, and then each part is correspondingly adjusted, and the accuracy of the adjusted model is higher.

S15. The corrected brightness value is corrected according to the adjusted brightness estimation model, and the adjusted brightness estimation model is obtained from step S14. After the brightness value is detected, the model may be obtained according to the model. After the brightness value is corrected and then output, the output brightness value is more accurate;

In this embodiment, the brightness value detected under the current current value may be compared with the brightness estimation interval corresponding to the current current value in the adjusted brightness estimation model;

If the brightness value obtained under the current current value is brighter corresponding to the current current value in the adjusted brightness estimation model Within the estimation interval, the brightness value detected under the current current value is output;

If the brightness value obtained under the current current value is greater than the maximum brightness value corresponding to the current current value in the adjusted brightness estimation model, outputting the maximum current value corresponding to the current brightness value in the adjusted brightness estimation model Brightness value

If the brightness value obtained under the current current value is smaller than the minimum brightness value corresponding to the current current value in the adjusted brightness estimation model, outputting the minimum current value corresponding to the current value in the adjusted brightness estimation model Brightness value.

The invention also provides a brightness detection and correction system for a projector, comprising:

The obtaining module 51 is configured to acquire an initial brightness estimation model of the projector, where the initial brightness estimation model includes each current value and a corresponding brightness estimation interval thereof;

In a preferred embodiment, the initial brightness estimation model in the obtaining module 51 is stored by a data list, and the data list stores each of the current values and their corresponding maximum initial brightness values and minimum initial brightness values. The maximum initial brightness value and the minimum initial brightness value corresponding to each of the current values constitute a brightness estimation interval corresponding to each of the current values, and the initial brightness estimation model is stored through the data list, and data processing can be performed more quickly.

The obtaining module 52 is configured to perform multiple brightness detections under a preset adjustment current value, obtain corresponding multiple adjustment brightness values, and obtain an average value of the plurality of adjusted brightness values;

As shown in Figure 3, at the same current and the same brightness, two dashed lines indicate the estimated brightness of the initial estimate. The range H31; the two solid lines represent the estimated value range H32 of the multiple estimated values, so the method of multiple mean estimation can effectively improve the brightness estimation accuracy and reduce the brightness estimation error.

After obtaining the initial brightness estimation model from the obtaining module 51, since the error of the model is large, it needs to be adjusted to reduce the error; in this step, the brightness sensor is used for multiple brightness according to the preset adjustment current value. The detection obtains a plurality of adjusted brightness values corresponding to the adjusted current value, and obtains an average value of the plurality of adjusted brightness values.

The comparison module 53 is configured to compare an average value of the plurality of adjusted brightness values with a midpoint value of the brightness estimation interval corresponding to the adjusted current value in the initial brightness estimation model, to obtain an adjustment error;

The average value of the plurality of adjusted brightness values obtained by adjusting the brightness value under the multiple brightness detection is obtained from the obtaining module 52, since the average value of the brightness estimation is used as the brightness estimation value is more accurate than the single brightness estimation value. High, the error is small, and the more the number of times, the smaller the error, so it can be considered that the error of the average value of the plurality of adjusted brightness values obtained under multiple brightness detection is small, and the precision is high;

In a preferred embodiment, the comparing module is further configured to: divide the adjusted current value in a midpoint value of the corresponding brightness estimation interval in the initial brightness estimation model, and divide the plurality of adjusted brightness values by The average value is obtained as the adjustment error.

The adjusting module 54 is configured to adjust a brightness estimation interval corresponding to each current value in the initial brightness estimation model according to the adjustment error, to obtain an adjusted brightness estimation model;

After obtaining the adjustment error from the comparison module 53, the brightness estimation interval corresponding to each current value in the initial brightness estimation model is correspondingly adjusted, and the adjusted brightness estimation model is obtained, and the model has higher precision than the initial brightness estimation model. The error is small; in this embodiment, the adjustment module 54 can be run in the background, and the initial brightness estimation model is adjusted according to a preset time interval, and the adjusted brightness estimation model is updated at intervals, without affecting the brightness. Improve the accuracy of brightness detection correction on the premise of estimating efficiency.

In a preferred embodiment, the adjusting module is further configured to multiply the maximum initial brightness value and the minimum initial brightness value corresponding to each of the current values in the initial brightness estimation model by the adjustment error, to obtain the The adjusted brightness estimation model; the comparison module 53 calculates a ratio of the average value obtained by the adjusted current value after the multiple detections to the corresponding brightness value in the initial brightness estimation model, correspondingly records each of the data records Maximum initial brightness corresponding to each current value Both the degree value and the minimum initial brightness value are multiplied by the ratio, thereby achieving the purpose of reducing the error of the initial brightness estimation model, and obtaining a higher precision adjusted brightness estimation model.

The output module 55 is configured to perform the corrected brightness value according to the adjusted brightness estimation model, and then output the corrected brightness value.

In a preferred embodiment, the output module 55 is further configured to:

Comparing the brightness value detected under the current current value with a brightness estimation interval corresponding to the current current value in the adjusted brightness estimation model;

If the brightness value obtained under the current current value is within the brightness estimation interval corresponding to the current current value in the adjusted brightness estimation model, outputting the brightness value detected under the current current value;

The brightness detection correction method and system of the projector of the present invention compares the brightness average value with the initial brightness estimation model by performing a brightness average value obtained by performing multiple brightness detections at a preset adjustment current value. The brightness value corresponding to the current value is adjusted, and the initial brightness estimation model with larger error is adjusted to obtain an adjusted brightness estimation model with less error, and the detected brightness value can be corrected according to the model and output; the invention is based on multiple times The detected average brightness value adjusts the initial brightness estimation model, effectively reduces the error rate of the brightness estimation, improves the accuracy of the brightness value, and realizes a simple and fast process.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

Rights request

1. A brightness detection and correction method for a projector, characterized in that it includes the following steps:

Obtain the initial brightness estimation model of the projector. The initial brightness estimation model includes each current value and its corresponding brightness estimation interval;

Perform multiple brightness detections at the preset adjustment current value to obtain multiple corresponding adjustment brightness values, and obtain the average of the multiple adjustment brightness values;

Compare the average value of the plurality of adjusted brightness values with the midpoint value of the brightness estimation interval corresponding to the adjusted current value in the initial brightness estimation model to obtain an adjustment error;

Adjust the brightness estimation interval corresponding to each current value in the initial brightness estimation model according to the adjustment error to obtain an adjusted brightness estimation model;

2. The brightness detection and correction method of a projector according to claim 1, wherein the initial brightness estimation model is a data list, and the data list stores each current value and its corresponding maximum initial brightness value and The minimum initial brightness value, the maximum initial brightness value and the minimum initial brightness value corresponding to each current value constitute a brightness estimation interval corresponding to each current value.

3. The brightness detection and correction method of a projector according to claim 2, characterized in that: comparing the average value of the plurality of adjusted brightness values with the corresponding value of the adjusted current value in the initial brightness estimation model. The size of the midpoint value of the brightness estimation interval. The steps to obtain the adjustment error are:

The midpoint value of the brightness estimation interval corresponding to the adjusted current value in the initial brightness estimation model is divided by the average value of the multiple adjusted brightness values, and the obtained ratio is used as the adjustment error.

4. The brightness detection and correction method of a projector according to claim 3, wherein the brightness estimation interval corresponding to each current value in the initial brightness estimation model is adjusted according to the adjustment error to obtain the adjusted brightness. The steps to estimate the model are:

The adjusted brightness estimation model is obtained by multiplying the maximum initial brightness value and the minimum initial brightness value corresponding to each current value in the initial brightness estimation model by the adjustment error.

5. The brightness detection and correction method of a projector according to any one of claims 2 to 4, characterized in that the step of correcting and outputting the detected brightness value according to the adjusted brightness estimation model for:

Compare the brightness value detected at the current current value with the brightness estimation interval corresponding to the current current value in the adjusted brightness estimation model;

If the brightness value obtained at the current current value is within the brightness estimation interval corresponding to the current current value in the adjusted brightness estimation model, then the brightness value detected at the current current value is output;

If the brightness value obtained at the current current value is greater than the maximum brightness value corresponding to the current current value in the adjusted brightness estimation model, then the maximum brightness value corresponding to the current current value in the adjusted brightness estimation model is output. brightness value;

If the brightness value obtained at the current current value is less than the minimum brightness value corresponding to the current current value in the adjusted brightness estimation model, then output the minimum brightness value corresponding to the current current value in the adjusted brightness estimation model. brightness value.

6. A brightness detection and correction system for a projector, which is characterized by including:

The acquisition module is used to obtain the initial brightness estimation model of the projector. The initial brightness estimation model includes each current value and its corresponding brightness estimation interval;

The acquisition module is used to perform multiple brightness detections under a preset adjustment current value, obtain multiple corresponding adjustment brightness values, and obtain the average value of the multiple adjustment brightness values;

A comparison module configured to compare the average value of the plurality of adjusted brightness values with the midpoint value of the corresponding brightness estimation interval of the adjusted current value in the initial brightness estimation model to obtain an adjustment error;

An adjustment module, configured to adjust the brightness estimation interval corresponding to each current value in the initial brightness estimation model according to the adjustment error, to obtain an adjusted brightness estimation model;

An output module is used to correct and output the detected brightness value according to the adjusted brightness estimation model.

7. The projector brightness detection and correction system according to claim 6, characterized in that, the initial brightness estimation model in the acquisition module is a data list, and the data list stores each of the current values and their corresponding The maximum initial brightness value and the minimum initial brightness value of , and the maximum initial brightness value and the minimum initial brightness value corresponding to each current value constitute a brightness estimation interval corresponding to each current value.

8. The brightness detection and correction system of the projector according to claim 7, characterized in that, the comparison module further Used to: divide the midpoint value of the brightness estimation interval corresponding to the adjustment current value in the initial brightness estimation model by the average value of the multiple adjustment brightness values, and the obtained ratio is used as the adjustment error.

9. The brightness detection and correction system of the projector according to claim 8, wherein the adjustment module is further used to combine the maximum initial brightness value and the minimum value corresponding to each current value in the initial brightness estimation model. The initial brightness value is multiplied by the adjustment error to obtain the adjusted brightness estimation model.

10. The brightness detection and correction system of the projector according to any one of claims 7 to 9, characterized in that the output module is also used for: