OpenCV 和 Python - 图像太大而无法显示
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/35180764/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
OpenCV & Python - Image too big to display
提问by Zynk
I have an image that is 6400?×?3200, while my screen is 1280 x 800. Therefore, the image needs to be resized for display only. I am using Python and OpenCV 2.4.9. According to OpenCV Documentation,
我有一个 6400?×?3200 的图像，而我的屏幕是 1280 x 800。因此，图像需要调整大小以仅显示。我正在使用 Python 和 OpenCV 2.4.9。根据OpenCV 文档，
If you need to show an image that is bigger than the screen resolution, you will need to call namedWindow("", WINDOW_NORMAL) before the imshow.
如果需要显示大于屏幕分辨率的图像，则需要在 imshow 之前调用 namedWindow("", WINDOW_NORMAL)。
That is what I am doing, but the image is not fitted to the screen, only a portion is shown because it's too big. I've also tried with cv2.resizeWindow, but it doesn't make any difference.
这就是我正在做的，但图像不适合屏幕，只显示了一部分，因为它太大了。我也尝试过 cv2.resizeWindow，但它没有任何区别。
import cv2
cv2.namedWindow("output", cv2.WINDOW_NORMAL) # Create window with freedom of dimensions
# cv2.resizeWindow("output", 400, 300) # Resize window to specified dimensions
im = cv2.imread("earth.jpg") # Read image
cv2.imshow("output", im) # Show image
cv2.waitKey(0) # Display the image infinitely until any keypress
采纳答案by Zynk
Although I was expecting an automatic solution (fitting to the screen automatically), resizing solves the problem as well.
虽然我期待一个自动解决方案（自动适应屏幕），但调整大小也解决了这个问题。
import cv2
cv2.namedWindow("output", cv2.WINDOW_NORMAL) # Create window with freedom of dimensions
im = cv2.imread("earth.jpg") # Read image
imS = cv2.resize(im, (960, 540)) # Resize image
cv2.imshow("output", imS) # Show image
cv2.waitKey(0) # Display the image infinitely until any keypress
回答by FrancisYL
In opencv, cv.namedWindow() just creates a window object as you determine, but not resizing the original image. You can use cv2.resize(img, resolution) to solve the problem.
在 opencv 中， cv.namedWindow() 只是根据您的决定创建一个窗口对象，而不是调整原始图像的大小。您可以使用 cv2.resize(img,resolution) 来解决问题。
Here's what it displays, a 740 * 411 resolution image.
这是它显示的内容，一个 740 * 411 分辨率的图像。
image = cv2.imread("740*411.jpg")
cv2.imshow("image", image)
cv2.waitKey(0)
cv2.destroyAllWindows()
Here, it displays a 100 * 200 resolution image after resizing. Remember the resolution parameter use column first then is row.
在这里，它在调整大小后显示 100 * 200 分辨率的图像。记住分辨率参数首先使用列然后是行。
image = cv2.imread("740*411.jpg")
image = cv2.resize(image, (200, 100))
cv2.imshow("image", image)
cv2.waitKey(0)
cv2.destroyAllWindows()
回答by MARTIN ALEXIS SAMAN ARATA
Try this:
尝试这个：
image = cv2.imread("img/Demo.jpg")
image = cv2.resize(image,(240,240))
The imageis now resized. Displaying it will render in 240x240.
在image现在的调整。显示它将以 240x240 呈现。
回答by nathancy
The other answers perform a fixed (width, height)resize. If you wanted to resize to a specific size while maintaining aspect ratio, use this
其他答案执行固定(width, height)调整大小。如果您想在保持纵横比的同时调整到特定大小，请使用此
def ResizeWithAspectRatio(image, width=None, height=None, inter=cv2.INTER_AREA):
dim = None
(h, w) = image.shape[:2]
if width is None and height is None:
return image
if width is None:
r = height / float(h)
dim = (int(w * r), height)
else:
r = width / float(w)
dim = (width, int(h * r))
return cv2.resize(image, dim, interpolation=inter)
Example
例子
image = cv2.imread('img.png')
resize = ResizeWithAspectRatio(image, width=1280) # Resize by width OR
# resize = ResizeWithAspectRatio(image, height=1280) # Resize by height
cv2.imshow('resize', resize)
cv2.waitKey()
回答by Madhu C
Try with this code:
尝试使用此代码：
from PIL import Image
Image.fromarray(image).show()
