Python 读取图像灰度 opencv 3.0.0-dev
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Read image grayscale opencv 3.0.0-dev
提问by elaRosca
I am trying to read images directly as black and white.
我正在尝试将图像直接读取为黑白图像。
I recently updated my OpenCv version to 3.0.0-dev, and the code that I used before does not work anymore.
我最近将我的 OpenCv 版本更新为 3.0.0-dev，我之前使用的代码不再起作用了。
img = cv2.imread(f, cv2.CV_LOAD_IMAGE_GRAYSCALE)
works fine for 2.4 but does not work for the new version, as there is no field CV_LOAD_IMAGE_GRAYSCALE.
适用于 2.4 但不适用于新版本，因为没有 field CV_LOAD_IMAGE_GRAYSCALE。
Any suggestions?
有什么建议？
Note: I know that cv2.imread(f,0)will work, but I do not like having unnamed constants in my code.
Thanks!
注意：我知道这cv2.imread(f,0)会起作用，但我不喜欢在我的代码中使用未命名的常量。谢谢！
采纳答案by Aurelius
The flag has been renamed to cv2.IMREAD_GRAYSCALE. Generally speaking, flags now have names prefixed in a manner that relates to the function to which they refer. (e.g. imreadflags start with IMREAD_, cvtColorflags start with COLOR_, etc.)
该标志已重命名为cv2.IMREAD_GRAYSCALE. 一般来说，标志现在的名称前缀与它们所引用的函数有关。（例如imread标志以 开头IMREAD_，cvtColor标志以 开头COLOR_，等等）
回答by Jibin Mathew
Try this it works for me
试试这个对我有用
import cv2
im_gray = cv2.imread('gray_image.png', cv2.IMREAD_GRAYSCALE)
thresh = 127
im_bw = cv2.threshold(im_gray, thresh, 255, cv2.THRESH_BINARY)[1]
cv2.imwrite('blackwhite.png', im_bw)
回答by Sarthak Vajpayee
Try this, it works for me everytime
试试这个，它每次都对我有用
import cv2
gray_img = cv2.imread('img.png', 0)
cv2.imshow(gray_img)
