1. A method for detecting a convex polygon image block, wherein the method comprises: acquiring an image collected by an image sensor; acquiring a corner set, wherein the corner set comprises a corner in the image, and the corner is an intersection point at which any two straight line sides that are not parallel to each other in the image intersect; and detecting a convex polygon image block from the image according to the corner set, wherein a shape of the convex polygon image block is a preset shape and a similarity between the convex polygon image block and a preset image block exceeds a preset first threshold, wherein the acquiring the corner set comprises: acquiring a candidate corner set, wherein a candidate corner in the candidate corner set is a pixel, of which a corner response value is greater than a preset second threshold, in the image, a contour point comprised by a contour of a connected component in the image, or an edge point comprised by an edge of an object in the image; and selecting, from the candidate corner set, a candidate corner which is an intersection point where two straight line sides that are not parallel to each other intersect, using the selected candidate corner as a corner, and forming a corner set.