我有大量来自桌面图像的裁剪图像。由于"剩饭和#34; OCR
在文本检测方面存在一些问题。桌边框。实际上,我正在寻找删除它们的方法(我想只提取文本)。以下是一些例子:
谢谢!
答案 0 :(得分:1)
此代码(基于opencv)解决了两个示例的问题。程序如下:
这里是python代码:
import cv2
import matplotlib.pylab as plt
import numpy as np
# load image
img = cv2.imread('om9gN.jpg',0)
# blur and apply otsu threshold
img = cv2.blur(img, (3,3))
_, img = cv2.threshold(img,0,255,cv2.THRESH_BINARY+cv2.THRESH_OTSU)
# invert image
img = (img == 0).astype(np.uint8)
img_new = np.zeros_like(img)
# find contours
_,contours,_ = cv2.findContours(img, 1, 2)
for idx, cnt in enumerate(contours):
# get area of contour
temp = np.zeros_like(img)
cv2.drawContours(temp, contours , idx, 1, -1)
area_cnt = np.sum(temp)
# get number of pixels of bounding box of contour
x,y,w,h = cv2.boundingRect(cnt)
area_box = w * h
# get ratio of cnt-area and box-area
ratio = float(area_cnt) / area_box
# only draw contour if:
# - 1.) ratio is not too big (line fills whole bounding box)
# - 2.) ratio is not too small (combination of lines fill very
# small ratio of bounding box)
if 0.9 > ratio > 0.2:
cv2.drawContours(img_new, contours , idx, 1, -1)
plt.figure()
plt.subplot(1,2,1)
plt.imshow(img_new)
plt.axis("off")
plt.show()