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Support for reading images in correct orientation using EXIF data.

Open RafayAK opened this issue 6 years ago • 5 comments

Current Behavior

I'm working on image processing with some images I collected myself. Dlib's dlib.load_rgb_image('image_path') method swaps the rows and columns on some images while OpenCV's cv2.imread('image_path') method does not.

Check out the results below

img = dlib.load_rgb_image("myimg.jpg")
print(img.shape)

--------------------
OUTPUT: (1944, 2592, 3)
(the resultant image is rotated 90 degrees clockwise)

while OpenCV's method returns the correct shape:

img = cv2.imread("myimg.jpg")
print(img.shape)

--------------------
OUTPUT: (2592, 1944, 3)

dlib.load_rgb_image() does not take into account the EXIF orientation metadata, so some images are read incorrectly.

I don't want to go in and rotate some of these offending images myself manually because I'm creating an app.

Is there a way in Dlib to read images using orientation information?

Note: I asked this question of stackoverflow, one of the comments told me to create an issue here

  • Version: 19.17.0
  • Where did you get dlib: pip
  • Platform: Windows 10 - 64bit
  • Compiler: python 3.6

RafayAK avatar Mar 28 '19 10:03 RafayAK

Added platform info

RafayAK avatar Mar 29 '19 05:03 RafayAK

Yeah, it doesn't do anything with EXIF data. It would be cool if the loader used it. Someone should submit a pull request that adds that feature :)

davisking avatar Mar 30 '19 11:03 davisking

I'll see what I can do.

RafayAK avatar Apr 01 '19 07:04 RafayAK

Would this require changes somewhere towards the top of image_loader.h?

nmaynes avatar Apr 08 '19 19:04 nmaynes

That would be sensible.

davisking avatar Apr 09 '19 00:04 davisking