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import cv2
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#参数一:list结构的,轮廓信息
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#参数二:要使用的方法
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#返回值:处理过后的轮廓和矩形轮廓
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def sort_contours(cnts,method="left-to-right"):
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reverse=False
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i=0
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if method=="right-to-left" or method =="bottom-to-top":
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reverse=True
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if method=="top-to-bottom" or method=="bottom-to-top":
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i=1
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'''
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cv2.boundingRect(c)
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返回四个值,分别是x,y,w,h;
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x,y是矩阵左上点的坐标,w,h是矩阵的宽和高
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'''
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boundingBoxes=[cv2.boundingRect(c) for c in cnts] #在轮廓信息中找到一个外接矩形
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(cnts,boundingBoxes)=zip(*sorted(zip(cnts,boundingBoxes),key=lambda b:b[1][i],reverse=reverse))
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return cnts,boundingBoxes
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#重置大小,用于比较模板和图像中的数字是否一致
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#插值方法如下:
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#INTER_NEAREST:最邻近插值
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#INTER_LINEAR:双线性插值,默认情况下使用该方式进行插值.
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#INTER_AREA:基于区域像素关系的一种重采样或者插值方式.该方法是图像抽取的首选方法,它可以产生更少的波纹,
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#但是当图像放大时,它的效果与INTER_NEAREST效果相似.
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#INTER_CUBIC:4×4邻域双3次插值
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#INTER_LANCZOS4:8×8邻域兰索斯插值
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def resize(image,width=None,height=None,inter=cv2.INTER_AREA):
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dim=None
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(h,w)=image.shape[:2] #(200,300,3)
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if width is None and height is None:
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return image
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if width is None:
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r=height/float(h)
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dim=(int(w*r),height)
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else:
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r=width/float(w)
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dim=(width,int(h*r))
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resized=cv2.resize(image,dim,interpolation=inter)
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return resized
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