Python - OpenCV - imread - Displaying Image

Question

I am currently working on reading an image and displaying it to a window. I have successfully done this, but upon displaying the image, the window only allows me to see a portion of the full image. I tried saving the image after loading it, and it saved the entire image. So I am fairly certain that it is reading the entire image.

imgFile = cv.imread('1.jpg')  cv.imshow('dst_rt', imgFile) cv.waitKey(0) cv.destroyAllWindows() 

Image:

Screenshot:

Answer 1

Looks like the image is too big and the window simply doesn't fit the screen. Create window with the cv2.WINDOW_NORMAL flag, it will make it scalable. Then you can resize it to fit your screen like this:

from __future__ import division import cv2   img = cv2.imread('1.jpg')  screen_res = 1280, 720 scale_width = screen_res[0] / img.shape[1] scale_height = screen_res[1] / img.shape[0] scale = min(scale_width, scale_height) window_width = int(img.shape[1] * scale) window_height = int(img.shape[0] * scale)  cv2.namedWindow('dst_rt', cv2.WINDOW_NORMAL) cv2.resizeWindow('dst_rt', window_width, window_height)  cv2.imshow('dst_rt', img) cv2.waitKey(0) cv2.destroyAllWindows() 

According to the OpenCV documentation CV_WINDOW_KEEPRATIO flag should do the same, yet it doesn't and it's value not even presented in the python module.

Answer 2

This can help you

namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display. imshow( "Display window", image );                   // Show our image inside it.