How to detect while uploading image if it is upside down(rotated)..?

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In asp.net web application while uploading image, sometimes it save as upside down. So how to detect whether or not image is correct in asp.net c#..??
 
Some suggestion I have as, I can detect that from EXIF data related to image detail. How can I solve this issue..??
 
Please provide c# code if possible..!
 
Thank...!

Posted 5-Sep-15 1:59am

Kailas_

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Afzaal Ahmad Zeeshan 5-Sep-15 9:08am

To check it you will need to compare it with another image that is in actual side up. Do you have that?

If not, then you cannot. And guessing might cause a problem where program will return false for images that are not upside down and so on. Also, does it really matter? What are you using as the image processing library?

[no name] 5-Sep-15 9:09am

"sometimes it save as upside down": On what criterion you decide this?

F-ES Sitecore 5-Sep-15 10:09am

You're not going to be able to work out if the image is upside down, you'll just have to rely on human intervention to check the images are ok, either a manual moderation workflow or just notify someone an image has been uploaded and have them look at it.

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George Jonsson · Accepted Answer · 2015-09-05T14:54:00

Solution 1

You can try the following code. It might work if your images contain the EXIF orientation value.
It is easy enough to test the code below and see if the property ID exist.
Not sure this will solve your problem, but it is worth a try.

C#

Image img = Image.FromFile("some file path");
if (img.PropertyIdList.Contains(0x0112))
{
    PropertyItem propOrientation = _image.GetPropertyItem(0x0112);
    short orientation = BitConverter.ToInt16(propOrientation.Value, 0);
    if (orientation == 6)
    {
        img.RotateFlip(RotateFlipType.Rotate90FlipNone);
    }
    else if (orientation == 8)
    {
        img.RotateFlip(RotateFlipType.Rotate270FlipNone);
    }
    else
    {
        // Do nothing
    }
}

Orientation Values

1 = Horizontal
6 = Vertical, rotated 90 degrees
8 = Vertical, rotated 270 degrees

The above values works at least on pictures taken with my Canon DSLR camera.
I have never tried to take a picture upside down, though.

Posted 5-Sep-15 14:54pm

George Jonsson

Updated 5-Sep-15 19:04pm

v3

Comments

[no name] 6-Sep-15 6:18am

Cool, thank you for that and have a 5.

Kailas_ 7-Sep-15 2:19am

Even it not contain 0x0112..

George Jonsson 7-Sep-15 3:31am

If your image doesn't contain the orientation property (0x0112), the code above will not work. Images created by a camera should have the property, but images created in Photoshop or similar software will probably not have it.
There might be a possibility to use a vision library, such as OpenCV, to do some clever analysis of the image, but this is beyond my knowledge.
I also assume that it will be difficult to get a fool proof solution.

Kailas_ 7-Sep-15 5:16am

I have used ExifLib for getting image related detail but still not working..

Kailas_ 8-Sep-15 1:34am

Hey friend thanks for suggestion above code helpful but I got true issue and that is only happen with image if it is taken by iphone..
Once again thanks Mr. George Jonsson.. :-)

George Jonsson 8-Sep-15 1:53am

You are welcome.
And Apple is sometimes better at marketing than making phones. :P

Member 14168791 27-Apr-20 9:38am

After several days of looking around - finally I found a simple code working from begining. Thank you - you saved my day!!
Kurt J