What object class is in the X and Y coordinates of 126 and 363?
object class refers to OBJ_CLASS; X and Y coordinates of 126 and 363 refer to coordinates of the bounding box where X = 126 and Y = 363;
SELECT T1.IMG_ID, T2.OBJ_CLASS FROM IMG_OBJ AS T1 INNER JOIN OBJ_CLASSES AS T2 ON T1.OBJ_CLASS_ID = T2.OBJ_CLASS_ID WHERE T1.X = 126 AND T1.Y = 363