1. A method for left ventricle (LV) detection in a 2D magnetic resonance imaging (MRI) image, comprising: detecting a plurality of LV candidates in the 2D MRI image; detecting a plurality of apex candidates in the 2D MRI image; detecting a plurality of base candidates in the 2D MRI image; and selecting one of the plurality LV candidates using component-based voting based on each of the plurality of LV candidates, the plurality of apex candidates, and the plurality of base candidates, wherein said step of selecting one of the plurality LV candidates using component-based voting based on each of the plurality of LV candidates, the plurality of apex candidates, and the plurality of base candidates comprises: determining votes for each of the plurality of LV candidates based on other LV candidates of the plurality of LV candidates, determining votes for each of the plurality of LV candidates based on the apex candidates, determining votes for each of the plurality of LV candidates based on the base candidates, and selecting as a detection result the one of the plurality of LV candidates having a largest number of votes.