scanchars.py 文件源码

def getmarkerboundingrect(img, mkpos, mksize):
    buffer = int(mksize * 0.15)
    x = mkpos[0] - buffer
    y = mkpos[1] - buffer
    w = mksize + buffer*2
    h = mksize + buffer*2
    roi = img[y:y+h, x:x+w]

    grayroi = getgrayimage(roi)
    ret, binimage = cv2.threshold(grayroi,0,255,cv2.THRESH_BINARY_INV+cv2.THRESH_OTSU)
    nlabels, labels, stats, centroids = cv2.connectedComponentsWithStats(binimage)
    # stats[0], centroids[0] are for the background label. ignore
    # cv2.CC_STAT_LEFT, cv2.CC_STAT_TOP, cv2.CC_STAT_WIDTH, cv2.CC_STAT_HEIGHT
    lblareas = stats[1:,cv2.CC_STAT_AREA]
    imax = max(enumerate(lblareas), key=(lambda x: x[1]))[0] + 1
    boundingrect = Rect(stats[imax, cv2.CC_STAT_LEFT],
                        stats[imax, cv2.CC_STAT_TOP], 
                        stats[imax, cv2.CC_STAT_WIDTH], 
                        stats[imax, cv2.CC_STAT_HEIGHT])
    return boundingrect.addoffset((x,y))