I want to detect corners from a image with boxes, although i created the chessboard edge lines with the EDlines algorithm. Now, I have some problems to join them to create perfect boxes. Could you help me maybe?

ed_anti=cvX.createEdgeDrawing()
            ed_anti.detectEdges(binarized)
            edges_anti=ed_anti.getEdgeImage(None)
            segments_anti=ed_anti.getSegments()#gets the segments of the edges
            gradiant_anti=ed_anti.getGradientImage(None)#detects the gradient of the edges
            ed_lines_anti=ed_anti.detectLines(None)#detects the lines

 if ed_lines_anti is not None: 
            lines_anti = np.uint16(np.around(ed_lines_anti))
            for i in range(len(ed_lines_anti)):
                cv.line(anti_black_image, (lines_anti[i][0][0], lines_anti[i][0][1]), (lines_anti[i][0][2], lines_anti[i][0][3]), (250, 0, 250), 1, cv.LINE_AA)