In a rectangular region detection mechanism, a to-be-processed image information is received, where the to-be-processed image information comprises at least two images, and where the at least two images comprise a same plurality of first feature points. A plurality of first edge line segments in one of the at least two images are detected. Four first edge line segments from the plurality of first edge line segments are determined. Locations of photographed points corresponding to the plurality of first feature points in a region formed by the four first edge line segments are determined based on location information of the plurality of first feature points. The region is determined as a rectangular region when the photographed points corresponding to the plurality of first feature points in the region are coplanar.