In this embodiment, the position of each pixel in the display image is treated in an XY rectangular coordinate system where the upper left corner of the image is set to {TAIL ~ the origin}, the rightward direction is set to the X axis, and the downward direction is set to {HEAD ~ the Y axis} 
In this embodiment , the position of each pixel in the display image is treated in an XY rectangular coordinate system where the upper left corner of the image is set to { TAIL ~ the origin } , the rightward direction is set to the X axis , and the downward direction is set to { HEAD ~ the Y axis }
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