Abstract:
A method of presenting an option comprises: calculating a movement range of an object; calculating an area of a display device based on the movement range; and presenting at least one option in the area of the display device.

Description:
TECHNICAL FIELD 
       [0001]    The invention relates to a method and apparatus for presenting an option. 
       BACKGROUND OF THE INVENTION 
       [0002]    A stroke rehabilitation system is a good tool for a stroke patient to do limb rehabilitation exercises. 
         [0003]    The existing stroke rehabilitation system may usually include a host controller, a video camera, a display device and passive markers. The display device may display guidance for a limb rehabilitation exercise prescribed by doctors and/or therapists. The passive markers are worn on hands, elbows and shoulders of the stroke patient. When the stroke patient wearing the passive markers on hands, elbows and shoulders does limb rehabilitation exercises according to the guidance being displayed on the display device, the video camera may pick up images of the patient, and the host controller may perform image processing on the images picked up by the video camera to detect the markers worn by the patient, and present the detected markers as pointers on the display device. The host controller may calculate a trajectory performed by the patient, based on trajectories of the detected markers, and compare the calculated trajectory with a medical exercise template to give an evaluation of the training quality. 
         [0004]    With the existing stroke rehabilitation system, user interaction needs to be carefully designed since the patient usually has an upper limb impairment on one side of the body. The use of an infrared remote controller in the existing stroke rehabilitation system is a feasible solution since the patient usually has an unimpaired upper limb on the other side of the body. 
         [0005]    However, there are some inconvenience attached to this solution. The patient needs to hold the remote controller when control is needed, and the remote controller has to be placed somewhere when the patient is doing his training exercises. Usually the patient should keep a standing position or sits in a wheelchair in an open area without a desk or table by his side, so that the patient will find there is no place to put down the remote controller. 
       SUMMARY OF THE INVENTION 
       [0006]    An object of the present invention is to provide a method and apparatus for presenting an option that enables user interaction to be performed without the controller. 
         [0007]    In accordance with one aspect, an apparatus for presenting an option comprises: a calculation module adapted to calculate a movement range of an object and calculate an area of a display device, based on the movement range; and a presentation module adapted to present at least one option in the area of the display device. 
         [0008]    In accordance with another aspect, a method of presenting an option comprises: calculating a movement range of an object; calculating an area of a display device, based on the movement range; and presenting at least one option in the area of the display device. 
         [0009]    These and other characteristics, features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention. The description is given for the sake of example only, without limiting the scope of the invention. The reference Figures given below refer to the attached drawings. 
     
    
     
       DESCRIPTION OF THE DRAWINGS 
         [0010]    The invention is explained in further detail, and by way of example, with reference to the accompanying drawings wherein: 
           [0011]      FIG. 1  is a schematic diagram illustrating a stroke rehabilitation system according to an embodiment of the invention; 
           [0012]      FIG. 2  illustrates a flowchart for a process of presenting an option according to an embodiment of the invention; and 
           [0013]      FIGS. 3A and 3B  are examples of presenting an option in the display device. 
       
    
    
       [0014]    Throughout the above drawings, like reference numerals will be understood to refer to like, similar or corresponding features or functions. 
       DETAILED DESCRIPTION OF EMBODIMENTS 
       [0015]    The present invention will be described with respect to particular embodiments and with reference to certain drawings but the invention is not limited thereto but only by the claims. The drawings described are only schematic and are non-limiting. In the drawings, the size of some of the elements may be exaggerated and not drawn to scale for illustrative purposes. Where an indefinite or definite article is used when referring to a singular noun, e.g. “a”, “an”, “the”, this includes a plural of that noun unless specifically stated otherwise. 
         [0016]      FIG. 1  is a schematic diagram illustrating a stroke rehabilitation system according to an embodiment of the invention. The stroke rehabilitation system  10  may include three retro-reflective markers  100   a,    100   b  and  100   c,  an infrared camera  110 , a display device  120  and a host controller  130 . 
         [0017]    The retro-reflective markers  100   a - 100   c  may be worn on a hand, elbow and shoulder of the patient, respectively. The marker  100   a  worn on the hand of the patient has a different shape from the marker  100   b  worn on the elbow of the patient and the marker  100   c  worn on the shoulder of the patient. 
         [0018]    The infrared camera  110  may pick up images including the patient. 
         [0019]    The display device  120  may display guidance about a limb rehabilitation exercise prescribed by doctors and/or therapists, and display at least one option in a specific area of the display device  120  as explained below in detail. 
         [0020]    The host controller  130 , which may include a processor, a RAM and a ROM, may perform image processing on the images picked up by the infrared camera  110  to obtain position information of the marker  100   a  worn on the hand of the patient, calculate a movement range of the marker  100   a,  based on the obtained position information, calculate an area of the display device  120 , based on the calculated movement range, the area of the display device  120  being an area that displays the calculated movement range if the calculated movement range is displayed in the display device  120 , and present at least one option (for example, menu item or button etc.) in the area of the display device  120  when the at least one option needs to be provided to the patient for selection. In another embodiment of the invention, the host controller  130  may further judge whether or not a pointer indicating the marker  100   a  on the display device  120  remains on one option of the at least one option for a predetermined period (for example 10 seconds), and determine that one option of the at least one option is selected by the patient when the judgment is affirmative. 
         [0021]      FIG. 2  illustrates a flowchart for a process of presenting an option according to an embodiment of the invention. A position calibration is performed to calibrate the patient&#39;s position such that it fits the training session (Step S 100 ). The position of the marker  100   a  at the moment of completing calibration is recorded as the starting point. 
         [0022]    After said position calibration, and until the system  10  is powered off, the camera  110  may continuously pick up images including the patient, and whenever the camera  110  picks up a new image, image processing on the new image is performed by the host controller  130  to obtain the present position of the marker  100   a,  and a pointer indicating the marker  100   a  is presented in a position on the display device  120  corresponding to the present position of the marker  100   a.    
         [0023]    A guide is presented in the display device  120  by the host controller  130 , to ask the patient to move the marker  100   a  worn on the hand so as to measure the movement range that the marker  100   a  is able to cover (Step S 110 ). 
         [0024]    Images picked up by the infrared camera  110  during measurement of the movement range are transferred from the infra-red camera  110  to the host controller  130  (Step S 120 ). Here, the fact that the marker  100   a  worn on the hand of the patient goes back to the starting point means that measurement of the movement range of the marker  100   a  is completed. 
         [0025]    Image processing of each of the transferred images is performed by the host controller  130  to calculate the position of the marker  100   a  in each of said images, thus obtaining a plurality of positions of the marker  100   a  (Step S 130 ). 
         [0026]    A movement trajectory of the marker  100   a  is calculated by the host controller  130  by interconnecting the plurality of positions of the marker  100   a  (Step S 140 ). 
         [0027]    A region enclosed by the movement trajectory of the marker  100   a  is calculated by the host controller  130  as the movement range of the marker  100   a  (Step S 150 ). 
         [0028]    An area of the display device  120  is calculated by the host controller  130 , based on the movement range of the marker  100   a  (Step S 160 ). The area of the display device  120  is the area that displays the movement range of the marker  100   a  if the movement range of the marker  100   a  is displayed on the display device  120 . 
         [0029]    When an interaction is needed, at least one menu item indicating at least one option is presented in the calculated area of the display device  120  by the host controller  130  (Step S 170 ). Here, it is preferred that the at least one menu item is presented at the bottom of the calculated area of the display device  120 , so that it is easier for the patient to reach.  FIGS. 3A-3B  illustrate two examples of a first menu item  211  and a second menu item  215  presented at the bottom of the calculated area  220  of the display device  120 . In addition,  FIGS. 3A-3B  also illustrate the pointer  230  indicating the marker  100   a  in the display device  120 . 
         [0030]    The host controller  130  judges whether or not the pointer indicating the marker  100   a  in the display device  120  remains on one menu of the at least one menu for a predefined period (e.g., 3 seconds) (Step S 180 ). 
         [0031]    If the judgment at Step S 180  is affirmative, one menu of the at least one menu is considered as being selected by the patient and an action corresponding to the one menu of the at least one menu is conducted by the host controller  130  (Step S 190 ). 
         [0032]    The stroke rehabilitation system and the process for presenting an option according to the invention should not be limited to the embodiments mentioned above. It will be apparent to those skilled in the art that various aspects of the invention claimed may be practiced in other examples that depart from these specific details. 
         [0033]    Those skilled in the art will understand that in the above embodiments of the invention, the movement trajectory of the marker  100   a  is calculated by using the Steps S 110 -S 140 , but the invention is not limited thereto. In an alternative embodiment of the invention, the movement trajectory of the marker  100   a  may also be calculated by using the following Steps S 110 ′-S 140 ′. At Step S 110 ′, a guide for measuring the movement range of the marker  100   a  is displayed on the display device  120  by the host controller  130 , to ask the patient to move the marker  100   a  that he wears on his hand so that the pointer indicating the marker  100   a  on the display device  120  tries to reach specified points on the display device  120 , for example four points indicating four corners of the display device  120  or eight points indicating four corners of the display device  120  and four midpoints of four sides of the display device  120 . At Step S 120 ′, images picked up by the infrared camera  110  during measurement of the movement range are transferred to the host controller  130  from the camera  110 . At Step S 130 ′, an image processing step is performed on the transferred images by the host controller  130  to obtain a plurality of positions of the marker  100   a.  At Step S 135 ′, multiple positions of the marker  100   a  are retrieved by the host controller  130  from the obtained plurality of positions of the marker  100   a,  wherein compared to other positions of the obtained plurality of positions of the marker  100   a,  each of the multiple positions of the marker  100   a  has a smaller distance with respect to one of the specified points. At Step S 140 ′, the movement trajectory of the marker  100   a  is calculated by the host controller  130  by interconnecting the multiple positions of the marker  100   a.    
         [0034]    Further, those skilled in the art will understand that in the above embodiments of the invention, the retro-reflective marker  100   a  worn on the hand of the patient is used as an object whose movement range is measured, but the invention is not limited thereto. In an alternative embodiment of the invention, the object whose movement range is measured may also be the marker  100   b  worn at the elbow of the patient, the marker  100   c  worn at the shoulder of the patient, a retro-reflective marker or non-reflective marker worn at any position of the upper limb of the patient, or in the palm of the hand of the patient. 
         [0035]    Further, those skilled in the art will understand that in the above embodiments of the invention, the infrared camera  110  is used as an image pickup means, but the invention is not limited thereto. In an alternative embodiment of the invention, the image pickup means may also be a common optical camera. 
         [0036]    Further, those skilled in the art will understand that in an alternative embodiment of the invention, the retro-reflective marker  100   a  used as the object whose movement range is measured may be replaced with a marker P equipped with a position detector such as a GPS or a combination of a magnetometer, gyroscope and accelerometer; the infrared camera  110  used as the image pickup means may be removed, and the Steps S 120 -S 130  may be replaced with the following Step S 125 ′ to obtain position information of the marker P during measurement of the movement range of the marker P. At Step S 125 ′, positions of the marker P during measurement of the movement range of the marker P are received by the host controller  130  from the marker P. 
         [0037]    In addition, those skilled in the art will understand that in the above embodiments of the invention, the option is indicated by the menu item on the display device  120 , but the invention is not limited thereto. In an alternative embodiment of the invention, the option may also be indicated by a button on the display device  120 . 
         [0038]    Further, those skilled in the art will understand that in the above embodiments of the invention, the Steps S 110 -S 160  are carried out to calculate the area of the display device  120  that displays the movement range of the object every time the system is powered on, but the invention is not limited thereto. In an alternative embodiment of the invention, the Steps S 110 -S 160  may be carried out one time only when a predetermined period elapses, or the Steps S 110 -S 160  may be carried out when the system  10  receives the instruction from the patient. 
         [0039]    Further, those skilled in the art will understand that the process for presenting an option according to the invention may be applied not only to the stroke rehabilitation system but also to other systems. 
         [0040]    Further, the operations executed by the host controller  130  in the process for presenting an option may be implemented by means of software, hardware or combination of software and hardware. 
         [0041]    It should be noted that the above described embodiments are given for describing rather than limiting the invention, and it is to be understood that modifications and variations may be resorted to without departing from the spirit and scope of the invention, as those skilled in the art will readily understand. Such modifications and variations are considered to be within the scope of the invention and the appended claims. The protective scope of the invention is defined by the accompanying claims.