1. A method for detecting a text region in an image, the method comprising: detecting a candidate text region from the image; generating a set of oriented gradient images of the candidate text region; capturing a detection window image of the candidate text region; calculating a sum of oriented gradients for a region in one of the oriented gradient images; classifying whether the detection window image contains text by comparing the sum of oriented gradients and a threshold; and determining whether the candidate text region is a text region based on the classification of the detection window image.