• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method for verifying an image display on an electronic screen, comprising the steps of: c) displaying at least one image on the electronic screen; d) measuring at least one value of a display parameter when displaying said at least one image; e) comparing said at least one measured value of said display parameter with at least one reference value corresponding to at least one reference image; and f) if said at least one measured value corresponds to said at least one reference value, determining that said at least one displayed image corresponds to said at least one reference image. A light emitting diode electronic screen is used and an electrical power consumption of at least a portion of the electronic screen as a display parameter.
    公开号:FR3017479A1
    申请号:FR1451004
    申请日:2014-02-10
    公开日:2015-08-14
    发明作者:Arnaud Simon；Hang Ung
    申请人:JCDecaux SA；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The present invention relates to methods and devices for verifying image display on light-emitting diode electronic displays (hereinafter LED displays). BACKGROUND OF THE INVENTION Document US 2011/0096246 A1 discloses a method for verifying a display on an electronic screen, in which an optical sensor is used to capture at least a portion of the display of an electronic screen in order to verify that this electronic display has displayed the desired images. Such a method can be implemented for example to guarantee an advertiser that a given advertising display (still images or video) has been displayed at the desired times or for the desired duration.
    [0002] This known method, however, has the disadvantage that it must install an optical sensor in front of the electronic screen, which increases the cost and complicates the installation. OBJECTS OF THE INVENTION The present invention is intended to overcome this disadvantage. To this end, the subject of the invention is a method for verifying an image display on an electronic screen, comprising the following steps: c) displaying at least one image on the electronic screen; d) measuring at least one value of a display parameter when displaying said at least one image; e) comparing said at least one measured value of said display parameter with at least one reference value corresponding to at least one reference image; and f) if said at least one measured value corresponds to said at least one reference value, determining that said at least one displayed image corresponds to said at least one reference image, characterized in that an electronic screen is used. light-emitting diodes, and that said display parameter used is an electrical consumption of at least a portion of the electronic screen. Thanks to these provisions, it is possible to correlate a power consumption of the LED screen to a predetermined image, and thereby to prove that this image has been broadcast on the LED screen. In various embodiments of the method according to the invention, it is advantageously also possible to use one and / or the other of the following provisions: the method further comprises a preliminary step b) of calculating said at least one reference value corresponding to said at least one reference image; the method further comprises a step a) of calibrating the electronic screen; the electronic screen comprises an array of M * N pixels, each pixel comprising a red LED, a green LED and a blue LED, and the electronic screen calibration step a) comprising the following sub-steps: Al) determining a power consumption of said at least a portion of the electronic screen when only all the red LEDs are lit with maximum brightness and maximum RGB color level; 35 a2) determining a power consumption of said at least a portion of the electronic screen when only all the green LEDs are lit with maximum brightness and maximum RGB color level; a3) determining a power consumption of said at least a portion of the electronic screen when only all the blue LEDs are lit with maximum brightness and maximum RGB color level; and a4) determining a power consumption of said at least a portion of the electronic screen when all the LEDs are off; the sub-steps a1) to a4) are carried out by measurements of electrical consumption; and - a plurality of reference images each corresponding to a reference value are used, said plurality of reference images forming a reference video and said reference values forming a reference electrical consumption curve of said at least one part of the electronic screen corresponding to said reference video. The invention also relates to a device for verifying an image display, comprising: an electronic screen; - A central unit adapted to control the electronic screen and display at least one image on the electronic screen; and a sensor adapted to measure a display parameter when displaying said at least one image, the central unit being adapted to: receive from said sensor at least one measured value of said display parameter; comparing said at least one measured value of said display parameter with at least one reference value corresponding to at least one reference image; and if said at least one measured value corresponds to said at least one reference value, determining that said at least one displayed image corresponds to said at least one reference image, characterized in that the electronic screen is a diode screen electroluminescent, and in that said display parameter is an electrical consumption of at least a portion of the electronic screen. In various embodiments of the device according to the invention, it is also advantageous to use one and / or the other of the following provisions: the central unit is adapted to calculate the said at least one value of reference corresponding to said at least one reference image; and said sensor has a sampling frequency of 60 Hz. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood on reading the following description of one of its embodiments, given solely by way of example. non-limiting with reference to the accompanying drawings, in which: - Figure 1 is a block diagram of a device according to the invention for checking a display of images on an LED screen; Figure 2 is a flowchart of a method according to the invention for checking an image display on an LED screen; and - Figure 3 is a front view of an LED screen displaying a given image. DETAILED DESCRIPTION In the various figures, the same references designate identical or similar elements. Figure 1 illustrates a device 10 for verifying an image display on an LED screen according to the invention. The device 10 comprises an LED screen 12, a central unit 14 (CPU) adapted to control the LED screen 12 and display at least one image on the LED screen, preferably several images, and a sensor 16 (CAPT) adapted to measure a display parameter when displaying images. The display parameter used is an electrical consumption of at least a portion of the LED screen 12, preferably of the entire LED screen 12. The LED screen 12 comprises a matrix of M * N pixels, each pixel with a red LED, a green LED and a 15 blue LED. The LEDs are mounted on electronic boards 18 arranged next to each other on a common frame. The present invention is equally applicable to LED screens using DIP ("Dual In Place") technology in which an LED corresponds to a color (red, green or blue) and in which the LEDs are mounted in depth on the boards. electronics, to LED displays using surface mount device (SMD) technology 25 in which an LED corresponds to three colors (red, green and blue) and in which the LEDs are surface-mounted on the electronic boards. Whatever the LED technology used, the electric currents necessary to display respectively red, green and blue are independent of each other. The LEDs are controlled individually by control boards 20 (DRIVER) which each control a group of LEDs, for example 8 LEDs. Each control card 20 can control all or part of the LEDs of an electronic card 18. Advantageously, the control cards 20 control the LEDs by multiplexing, each channel of each control card 20 controlling several LEDs by making them operate. alternate way. The control boards 20 are controlled by the central unit 14, such as a microprocessor or microcontroller or the like. The control cards 20 deliver to each LED 10 that they control a precisely determined electric current according to the commands received from the central unit 14. The device 10 further comprises a power supply module 22 (ALIM) which supplies the power supply. LED screen 12 and 15 the central unit 14. The sensor 16 is connected to the power supply module 22 and makes it possible to measure the instantaneous actual power consumption of at least a portion of the LED screen 12, preferably of all the Advantageously, the sensor 16 has a sampling frequency of 60 Hz. Such a sensor would thus make it possible to obtain reliable measurements and to adapt as well to the European system where the PAL standard imposes 25 images per second for the televisions, as to the 25 American and Japanese systems where the NTSC standard imposes 30 images per second. The sensor 16 is for example a wattmeter or an ammeter. Figure 2 illustrates the various steps of a method according to the invention for checking an image display on an LED screen, for example the LED screen 12 of Figure 1. The method is described below at using an example in which the LED screen 12 is of SMD type and comprises 128 * 96 pixels, each pixel being coded on 8 bits which corresponds to 256 RGB color levels ranging from 0 to 255. In addition, in In this example, the electrical consumptions determined are those of the entire LED screen. The method comprises a step a) of calibrating the LED screen 12 comprising the following substeps: al) determining a ConsoMax (R) power consumption of the LED screen 12 when only all the red LEDs are lit with maximum brightness and maximum RGB color level; 10a2) determining a ConsoMax (G) power consumption of the LED screen 12 when only all the green LEDs are lit with maximum brightness and maximum RGB color level; a3) determination of a power consumption ConsoMax (B) of the LED screen 12 when only all the blue LEDs are lit with a maximum brightness and a maximum RGB color level; and a4) determining a ConsoStatic power consumption of the LED screen 12 when all the LEDs 20 are off. Thus, in the sub-step al), respectively a2) and a3), the 128 * 96 red LEDs, respectively green and blue, are lit with a brightness of 100% and an RGB color level of 255, while all Green and blue LEDs, respectively red and blue, and red and green, are off. The power consumption of the LED screen determined in sub-step a4), that is to say when no LED is lit (black screen), is called "static consumption". It corresponds to the power consumption of all the components of the LED screen 12 other than the LEDs, for example the central unit 14, the control boards 20, fans, etc. Sub-steps al) to a4) are preferably carried out by electrical consumption measurements, that is to say by manually measuring in situ the different electrical consumptions with the aid of the sensor 16. In a variant, the sub-stages steps al) to a4) can be provided by the manufacturer of the LED screen 12. Example - ConsoMax (R) = 157 W - ConsoMax (G) = 112 W 10 - ConsoMax (B) = 134 W - ConsoStatic = 22.7 WA each given image corresponds to a predetermined color composition. Known image processing software such as Photoshop® can give the exact composition of an image in terms of RGB color level. The principle of the invention is to associate an image with an image of electrical consumption which can be calculated from the colors that make up this image, and in particular from the determinations made in substeps a1) to a4). Thus, the method comprises a prior step b) of calculating electrical consumption reference values corresponding to reference images. This step can be implemented by the central unit 14. From ConsoMax (R, G, B) determined in sub-steps al) to a3), the determined ConsoStatic in substep a4) and a characteristic of the LED screen 12 30 called "Gamma", it is possible to calculate the power consumption of the LED screen 12 for any RGB color level by the following formula: Conso (R, G, B) = (ConsoMax (R, G, B) -ConstantCalumn) * 35 ((Value (R, G, B) / 255) ^ Gamma) + ConsoStatic The gamma of a screen characterizes the contrast rendering of the screen and allows to describe the relationship between the amplitude of the input signal of the screen and the luminance produced by the screen, this relationship being according to a power law. The gamma of a screen is a given manufacturer and is generally equal to 2.2 for an electronic screen. Thus, from only four initial measurement points, it is possible to calculate the power consumption of an LED display displaying a red, green or blue image with a brightness of 100% and for any level of RGB color, all LEDs with the same RGB color level.
    [0003] Example Calculated Power Consumption (W) RGB Level Red R Green G Blue B White W 255.0 157.0 112.0 134.0 357.0 240.0 140.2 100.8 120.1 315, 3,225.0 124.7 90.5 107.2 276.5 210.0 110.3 81.0 95.3 240.8 195.0 97.1 72.2 84.4 208.0 180.0 85 , 1 64.2 74.4 178.1 165.0 74.2 57.0 65.4 151.0 150.0 64.5 50.5 57.3 126.7 135.0 55.8 44.7 50.2 105.2 120.0 48.3 39.7 43.9 86.4 105.0 41.8 35.4 38.5 70.2 90.0 36.3 31.7 34.0 56, 5 75.0 31.8 28.7 30.2 45.3 60.0 28.3 26.4 27.3 36.6 45.0 25.7 24.7 25.2 30.1 30.0 23 , 9 23.5 23.7 25.7 15.0 23.0 22.9 22.9 23.4 0.0 22.7 22.7 22.7 22.7 The white color W being obtained with an LED red, a green LED and a blue LED, the three LEDs having the same RGB color level, we have: Conso (W) = Conso (R) + Conso (G) + Conso (B) -2 * ConsoStatic It is therefore possible to accurately calculate the power consumption of a red, green or blue LED for any RGB level by dividing the corresponding consumptions by the number of LEDs of the LED screen 12. Thus, from only four initial measurement points, it is possible to calculate the power consumption of any image. Continuation of the Example Figure 3 shows the LED screen 12 displaying an image comprising four regions 30, 32, 34 and 36 with a brightness of 100%. The LED screen 12 has a total of 128 * 96 = 12288 pixels. The four regions 30-36 each take a quarter of the screen and thus comprise 12288/4 = 3072 pixels. Using Photoshop® or other image processing software, the color composition of each region is obtained: region 30 (red): R = 150, G = 0, B = 0 - region 32 (green) ): R = 0, G = 50, B = 0 30 - region 34 (blue): R = 0, G = 0, B = 230 - region 36 (orange): R = 220, G = 132, B = 25 So we have: - Conso (1/4 red) = (157-22,7) * ((150/255) ^ 2,2) * 3072/12288 = 10,4478 W - Conso (1/4 green) = (112-22.7) * ((50/255) ^ 2.2) * 3072/12288 = 0.6196 W - Conso (1/4 blue) = (134-22.7) * ((230/255 ) 2.272 * 3072/12288 = 22.1742 W - Conso (1/4 orange) = (157-22.7) * ((220/255) ^ 2.2) * 3072/12288 + (112 -22.7) * ((132/255) ^ 2.2) * 3072/12288 + (134-22.7) * ((25/255) ^ 2.2) * 3072/12288 = 24.2637 + 5,2440 + 0,1681 = 29,6758 W Thus, the calculated total consumption of the LED screen 12 is: - ConsoTot = Conso (1/4 red) + Conso (1/4 green) + Conso (1/4 blue) + Conso (1/4 orange) + Consistatic = 62.9175 + 22.7 = 85.6175 W. By comparison, the total measured consumption is 85.1 W, which is a calculation error of 0.6%.
    [0004] Returning to Figure 2, the method further comprises a step c) of displaying at least one image, preferably several images, on the LED screen 12. This step can be implemented by the central unit 14. The method further comprises a step d) of measuring at least one value, preferably several values, of actual instantaneous power consumption of the LED screen 12 when the images are displayed. This step is implemented using the sensor 16, by directly measuring the instantaneous electrical power consumed by the LED screen 12 or the instantaneous electric current. The data obtained can be stored by the central unit 14 or they can be sent by the central unit 14 to a memory of a remote server for later processing. In addition to the measured electrical consumption values, the data obtained may also include the date and time of the measurements. The method further comprises a step e) of comparing the measured values of electrical consumption with electric consumption reference values calculated in step b). This step can be implemented by the central unit 14 or, if appropriate, by the remote server. The method further comprises a step f) wherein, if at least one of the measured values corresponds to at least one of the reference values, it is determined that the respective displayed image corresponds to the respective reference image. This step can be implemented by the central unit 14 or, if appropriate, by the remote server.
    [0005] In addition to this determination, the central unit 14 and / or the remote server are also adapted to process the data obtained, namely to specify the date and time when the image was displayed, the duration during which the image was displayed and the repetition rate of the image display. In the case where there are several LED screens to check, the remote server is also adapted to indicate on which screen (s) LEDs the image has been broadcast. The invention therefore makes it possible to correlate a measured electrical consumption of the LED screen with a given image with a relatively good accuracy and thus to prove that this image has indeed been broadcast by the screen. Of course, the invention also applies to a video that can be defined as a succession of images. Thus, the electrical consumption reference values of the images composing the video form a reference power consumption curve corresponding to the video, the power consumption of the video varying as a function of time. By comparing this calculated reference curve with the measured consumption curves, it is possible, if necessary, to confirm the actual display of the video on the LED screen. It should be noted that the power consumption of the LED screen is linear with the brightness of the screen.
    [0006] Thus, if the LED screen is set to another brightness level, it is sufficient to apply a correction factor to the measured power consumption. In all that has been described above, the calculations / measurements are made on the entire LED screen 12, but it is quite possible to apply the invention to only part of the screen, for example in performing the calculations / measurements only on the LEDs of some electronic boards 18. It is also possible to provide several sensors 16, each dedicated to a predetermined portion of the LED screen. In particular, with a sensor for the left half of the screen and another sensor for the right part of the screen, we would avoid in particular the cases where the image is displayed upside down because in this case, the consumption electrical associated with the image is the same as that associated with the image in the place. The invention therefore proposes a method and a device that make it possible to associate a given power consumption signature with a given image and to record this signature using an electrical consumption sensor installed upstream of an LED screen. , thereby providing a tangible means of proof capable of proving very reliably the actual broadcasting of a content, image or video. 30
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONS1. A method of checking an image display on an electronic screen (12), comprising the following steps: c) displaying at least one image on the electronic screen (12); d) measuring at least one value of a display parameter when displaying said at least one image; e) comparing said at least one measured value of said display parameter with at least one reference value corresponding to at least one reference image; and f) if said at least one measured value corresponds to said at least one reference value, determining that said at least one displayed image corresponds to said at least one reference image, characterized in that an electronic screen is used. (12) light emitting diodes, and in that said display parameter used is an electrical consumption of at least a portion of the electronic screen (12).
    [0002]
    2. Method according to claim 1, further comprising a step b) prior to calculation of said at least one reference value corresponding to said at least one reference image.
    [0003]
    The method of claim 1 or 2, further comprising a step (a) of calibrating the electronic screen (12).
    [0004]
    The method of claim 3, wherein the electronic screen (12) comprises a matrix of M * N pixels, each pixel having a red LED, a green LED and a blue LED, and the calibration step a) of the electronic screen (12) comprising the following substeps: al) determining an electrical consumption of said at least a portion of the electronic screen (12) when only all the red LEDs are lit with maximum brightness and a maximum RGB color level; a2) determining an electrical consumption of said at least a portion of the electronic screen (12) when only all the green LEDs are lit with maximum brightness and maximum RGB color level; a3) determining an electrical consumption of said at least a portion of the electronic screen (12) when only all the blue LEDs are lit with maximum brightness and maximum RGB color level; and a4) determining an electrical consumption of said at least a portion of the electronic screen (12) when all the LEDs are off.
    [0005]
    5. The method of claim 4, wherein the substeps a1 to a4) are performed by power consumption measurements.
    [0006]
    6. Method according to any one of claims 1 to 5, wherein there are used several reference images each corresponding to a reference value, said plurality of reference images forming a reference video and said reference values forming a consumption curve. electrical reference of said at least a portion of the electronic screen (12) corresponding to said reference video.
    [0007]
    7. Apparatus (10) for checking an image display, comprising: - an electronic screen (12); a central unit (14) adapted to control the electronic screen (12) and display at least one image on the electronic screen (12); and a sensor (16) adapted to measure a display parameter when displaying said at least one image, the CPU (14) being adapted to: - receive from said sensor (16) at least one measured value of said display setting; comparing said at least one measured value of said display parameter with at least one reference value corresponding to at least one reference image; and if said at least one measured value corresponds to said at least one reference value, determining that said at least one displayed image corresponds to said at least one reference image, characterized in that the electronic screen (12) is a LED display, and in that said display parameter is an electrical power consumption of at least a portion of the electronic screen (12).
    [0008]
    The apparatus (10) of claim 7, wherein the central unit (14) is adapted to calculate said at least one reference value corresponding to said at least one reference image.
    [0009]
    The apparatus (10) of claim 7 or 8, wherein said sensor (16) has a sampling frequency of 60 Hz.
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    同族专利:
    公开号 | 公开日
    EP2905771A1|2015-08-12|
    FR3017479B1|2017-06-23|
    AU2015200641A1|2015-08-27|
    US20150228221A1|2015-08-13|
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    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    FR1451004A|FR3017479B1|2014-02-10|2014-02-10|METHOD AND DEVICE FOR VERIFYING DISPLAY OF IMAGES ON AN ELECTRONIC SCREEN|FR1451004A| FR3017479B1|2014-02-10|2014-02-10|METHOD AND DEVICE FOR VERIFYING DISPLAY OF IMAGES ON AN ELECTRONIC SCREEN|
    EP15154364.2A| EP2905771A1|2014-02-10|2015-02-09|Method and device for verifying an image display on an electronic screen|
    AU2015200641A| AU2015200641A1|2014-02-10|2015-02-10|Method and device for verifying a display of images on an electronic screen|
    US14/618,754| US20150228221A1|2014-02-10|2015-02-10|Method and Device for Verifying a Display of Images on an Electronic Screen|
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