目标区域提取3.py

import numpy as np
import cv2
from skimage import transform

def calc_length(point1, point2):
    x = (point1[0] - point2[0]) ** 2
    y = (point1[1] - point2[1]) ** 2
    return (x + y) ** 0.5

MIN_MATCH_COUNT = 10
#读入模板
dst_img = cv2.imread('C:/Users/Administrator/Desktop/1.jpg', 0)
#读入检测
ori_img = cv2.imread('C:/Users/Administrator/Desktop/2.jpg', 1)


sift = cv2.xfeatures2d.SIFT_create()

kp1, des1 = sift.detectAndCompute(dst_img, None)
kp2, des2 = sift.detectAndCompute(ori_img, None)


index_params = dict(algorithm = 1, trees = 5)
search_params = dict(checks = 50)
flann = cv2.FlannBasedMatcher(index_params, search_params)
matches = flann.knnMatch(des1,des2,k=2)


good = []
for m,n in matches:
    if m.distance < 0.7*n.distance:
        good.append(m)


if len(good) > MIN_MATCH_COUNT:
    
    src_pts = np.float32([ kp1[m.queryIdx].pt for m in good ]).reshape(-1,1,2)
    dst_pts = np.float32([ kp2[m.trainIdx].pt for m in good ]).reshape(-1,1,2)
    
    M, mask = cv2.findHomography(src_pts, dst_pts, cv2.RANSAC,5.0)
    matchesMask = mask.ravel().tolist()
    h,w = dst_img.shape
    pts = np.float32([[0,0],[0,h-1],[w-1,h-1],[w-1,0]]).reshape(-1,1,2)
    ori = cv2.perspectiveTransform(pts, M)

    dst = [(ele[0][0], ele[0][1]) for ele in ori]
    length_width = int(max(calc_length(dst[3], dst[0]), calc_length(dst[1], dst[2])))
    length_hight = int(max(calc_length(dst[0], dst[1]), calc_length(dst[2], dst[3])))
    tar = np.float32([[0,0],[length_hight,0],[length_hight,length_width], [0,length_width]])
    warp_matrix = cv2.getPerspectiveTransform(ori, tar)
    res = cv2.warpPerspective(ori_img, warp_matrix, (length_hight, length_width))
    rot_img = transform.rotate(res[::-1,:], -90, resize=True)
    img_new = cv2.resize(rot_img, (1600, 1186), interpolation=cv2.INTER_CUBIC)
    
	
    cv2.imshow("original", img_new)
    roi_list = list()
    rois = np.array([
        [[645, 245], [1500, 245], [1500, 330], [645, 330]],

        [[230, 330], [640, 330], [640, 420], [230, 420]],
        [[885, 330], [1010, 330], [1010, 420], [884, 420]],
        [[1205, 330], [1500, 330], [1500, 420], [1205, 420]],

        [[260, 440], [1500, 440], [1500, 530], [260, 530]],
        [[220, 530], [1130, 530], [1135, 635], [220, 635]],

        [[660, 645], [1230, 645], [1230, 740], [660, 740]],
        [[750, 745], [1130, 745], [1130, 845], [750, 845]],
        [[675, 860], [1130, 860], [1130, 970], [675, 970]],

        [[350, 985], [1150, 985], [1150, 1075], [350, 1075]],
    ])

    for roi in rois:
        xmin = np.min([coordinates[0] for coordinates in roi])
        xmax = np.max([coordinates[0] for coordinates in roi])
        ymin = np.min([coordinates[1] for coordinates in roi])
        ymax = np.max([coordinates[1] for coordinates in roi])
        roi_list.append((xmin, xmax, ymin, ymax))

		
    result = np.zeros_like(img_new)
    for roi in roi_list:
        result[roi[2]:roi[3], roi[0]:roi[1]] = img_new[roi[2]:roi[3], roi[0]:roi[1]]

    # 显示结果图像
    imm = cv2.normalize(result, None, 255, 0, cv2.NORM_MINMAX, cv2.CV_8UC1)
    cv2.imshow('IM',imm)
else:
    print("Not enough matches are found - %d/%d") % (len(good),MIN_MATCH_COUNT)
    matchesMask = None