Abstract:
An adjustment method for a media display system includes a camera capturing an image of a viewer, detecting a reference eyeline in the image, obtaining a midline of the image, comparing the reference eyeline with the midline to determine whether the two lines overlap and outputting a comparison signal correspondingly, and driving a driving apparatus according to the comparison signal to adjust height of an electronic billboard.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to a media display system and an adjustment method for the media display system. 
         [0003]    2. Description of Related Art 
         [0004]    Outdoor media, such as electronic billboards, provide advertising and information to the public. Most of these electronic billboards are mounted at a fixed height. Viewing of the display may be uncomfortable or difficult for those whose eyeline is outside the intended viewing angle of the electronic billboard. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0005]    Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0006]      FIG. 1  is an isometric view of an exemplary embodiment of a media display system with a driving apparatus. 
           [0007]      FIG. 2  is similar to  FIG. 1 , but viewed from another perspective. 
           [0008]      FIG. 3  is an explored, isometric view of the driving apparatus of  FIG. 1 . 
           [0009]      FIG. 4  is a block diagram of the media display system with a storage unit. 
           [0010]      FIG. 5  is a block diagram of the storage unit of  FIG. 4 . 
           [0011]      FIGS. 6 and 7  are schematic views showing adjusting the media display system of  FIG. 1 . 
           [0012]      FIG. 8  is a flowchart of an exemplary embodiment of an adjustment method for a media display system, according to an embodiment. 
       
    
    
     DETAILED DESCRIPTION 
       [0013]    The disclosure, including the accompanying drawings, is illustrated by way of example and not by way of limitation. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one. 
         [0014]    Referring to  FIGS. 1 to 4 , an exemplary embodiment of a media display system  1  includes an electronic billboard  10 , two cameras  12 , a storage unit  15 , a processing unit  17 , a pair of driving apparatus  16 , and a bracket  18 . The media display system  1  can adjust a height of the electronic billboard  10 . Referring to  FIG. 6 , in the embodiment, it is assumed that when a viewer&#39;s eyeline is aligned with a midline of the electronic billboard  10 , viewability is optimized. In other embodiments, the relationship between the electronic billboard  10  and the viewer can be preset. 
         [0015]    The cameras  12  are mounted on a left side and a right side of the horizontally extended midline (the midline) of the electronic billboard  10 , respectively, to capture images  30  of the viewer. The processing unit  17  and the storage unit  15  process the images  30  captured by the cameras  12  to determine a reference eyeline E 1  in the images  30  and a midline M 1  of the images  30 . The processing unit  17  and the storage unit  15  further control the driving apparatus  16  to adjust the height of the electronic billboard  10  to synchronize the reference eyeline E 1  and the midline M 1  of the images  30 . In other embodiments, there may be only one camera  12  mounted on the left side or the right side of the midline of the electronic billboard  10 . 
         [0016]    In the embodiment, the bracket  18  has a Y-shaped configuration and includes a pair of vertical arms  181 . Each of the arms  181  defines a receiving space, and a vertical slot defined in a first sidewall of the arms  181  communicates with the receiving space. Each driving apparatus  16  includes a motor  160  attached to a rear of the billboard  10 , a gear  161  attached to a rotor of the motor  160 , and a track  162  formed on an inside of a second sidewall of the arm  181  perpendicular to the first sidewall. The gear  161  is received in the receiving space of the bracket  18  to engage the track  162  and the rotor of the motor  160  extends through the slot of the bracket  10 . In addition, a motion sensor (such as, for example, a G sensor)  13  is mounted to the electronic billboard  10  to determine whether the electronic billboard  10  moves when the driving apparatus  16  operates. 
         [0017]    Referring to  FIG. 5 , the storage unit  15  includes a facial detection module  150 , an eye detection module  152 , a midline determination module  153 , a comparison module  156  and a control module  158 , which may include one or more computerized instructions executed by the processing unit  17 . 
         [0018]    The facial detection module  150  detects the face region  32  in the images  30  captured by the cameras  12 . It is noteworthy that the facial detection module  150  uses well known facial recognition technology to detect a face region in an image. 
         [0019]    The eye detection module  152  detects the reference eyeline E 1  of the eye in the face region  32  of the image  30 . It is noteworthy that the eye detection module  152  uses well known recognition technology to detect an eye region in a face region. In other embodiment, the eye detection module  152  can be omitted. A top one-third of the face region  32  is regarded as the reference eyeline E 1 . 
         [0020]    The midline determination module  155  obtains the midline M 1  of the image  30 . The comparison module  156  compares the midline M 1  and the reference eyeline E 1  of the face region  32  in the image  30 , and outputs a corresponding comparison signal to the control module  158 . The control module  158  directs the driving apparatus  16  to adjust the height of the electronic billboard  10 . 
         [0021]    Referring to  FIG. 6 , the camera  12  captures an image  30  of the viewer. In the embodiment, in the image  30 , other portions, such as the shoulder and neck, are cropped. 
         [0022]    The facial detection module  150  detects the face region  32  in the image  30 . The eye detection module  152  detects the reference eyeline E 1  in the face region  32 . The midline determination module  155  obtains the midline M 1  of the image  30 . The comparison module  156  compares the midline M 1  of the image  30  with the reference eyeline E 1  in the face region  32  to determine that the reference eyeline E 1  of the face region  32  is misaligned with the midline M 1  of the image  30 , and outputs a corresponding comparison signal to the control module  158 . 
         [0023]    The control module  158  directs the driving apparatus  16  to move the electronic billboard  10  up a distance, such as two centimeters. Conversely, if the reference eyeline E 1  of the face region  32  in the image  30  is lower than the midline M 1  of the image  30 , the control module  158  directs the driving apparatus  16  to move the electronic billboard  10  down a distance, such as one centimeter. Repeating these actions, referring to  FIG. 7 , to overlap the midline M 1  of the image  30  with the reference eyeline E 1 . Then, the control module  158  stops the driving apparatus  16   
         [0024]    When the camera  12  is mounted on the midline of the electronic billboard  10 , the midline of the electronic board  10  is in alignment with the midline M 1  of the image  30 . Referring to  FIG. 7 , when the reference eyeline E 1  of the face region  32  is in alignment with the midline M 1  of the image  30 , the viewer can comfortably view the electronic billboard  10 . 
         [0025]    In the embodiment described above, there is only one viewer. In other embodiments, if there is more than one viewer, the facial detection module  150  detects the images to locate a plurality of face regions in the images. The eye detection module  152  detects the face regions to locate a reference eyeline in each face region, and obtains an average location of the plurality of eye regions. The comparison module  156  compares the average reference eyeline of the eye regions with the midline M 1  of the image  30 . 
         [0026]      FIG. 8  shows an adjustment method for an electronic billboard  10  as follows. 
         [0027]    In step S 81 , a camera  12  captures an image  30  of a viewer. 
         [0028]    In step S 82 , a facial detection module  150  detects a face region  32  in the image  30 . 
         [0029]    In step S 83 , an eye detection module  152  detects a reference eyeline in the face region  32 . 
         [0030]    In step S 84 , a midline determination module  153  determines the midline M 1  of the image  30 . 
         [0031]    In step S 85 , a comparison module  156  compares the reference eyeline E 1  with the midline M 1  of the image  30  to determine whether the reference eyeline E 1  and the midline M 1  overlap. Once the reference eyeline E 1  and the midline M 1  overlap, the viewer can comfortably view the contents on the electronic billboard  10 . If the reference eyeline E 1  and the midline M 1  are not overlapped, step S 86  is implemented. 
         [0032]    In step S 86 , the comparison module  156  outputs a comparison signal according to the comparison. 
         [0033]    In step S 87 , the control module  158  directs the driving apparatus  16  to move according to the comparison signal, and step S 81  is repeated. 
         [0034]    The foregoing description of the embodiments of the disclosure has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above everything. The embodiments were chosen and described in order to explain the principles of the disclosure and their practical application so as to enable others of ordinary skill in the art to utilize the disclosure and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those of ordinary skills in the art to which the present disclosure pertains without departing from its spirit and scope. Accordingly, the scope of the present disclosure is defined by the appended claims rather than the foregoing description and the exemplary embodiments described therein.