How to Crop Image without changing the aspect ratio
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13-11-2019 - |
سؤال
I need to crop an image without changing its aspect ratio. I am taking picture from CANON1100D using EDSDK. Captured image:
Width = 1920 and Height=1280
Aspect ration is 1.5. but I need picture which aspect ratio is 1.33.
// convert into processing resolution (1600,1200)
Image<Bgr, byte> runtime_frm = new Image<Bgr, byte>(frame.ToBitmap(1600,1200));
// also in bitmap processing
// Bitmap a = new Bitmap(runtime_frm.ToBitmap());
// Bitmap b = new Bitmap(a, new Size(1600,1200));
It's resizing the image so the aspect ratio of image is changed but it creates stress in image. I need to crop the image (1920x1280) to (1600x1200) in runtime.
How can i do this programmatically? any idea
المحلول
public void Crop(Bitmap bm, int cropX, int cropY,int cropWidth,int cropHeight)
{
var rect = new System.Drawing.Rectangle(cropX,cropY,cropWidth,cropHeight);
Bitmap newBm = bm.Clone(rect, bm.PixelFormat);
newBm.Save("image2.jpg");
}
Maybe something like that?
نصائح أخرى
this is my solution for centered cropping.
Bitmap CenterCrop(Bitmap srcImage, int newWidth, int newHeight)
{
Bitmap ret = null;
int w = srcImage.Width;
int h = srcImage.Height;
if ( w < newWidth || h < newHeight)
{
MessageBox.Show("Out of boundary");
return ret;
}
int posX_for_centerd_crop = (w - newWidth) / 2;
int posY_for_centerd_crop = (h - newHeight) / 2;
var CenteredRect = new Rectangle( posX_for_centerd_crop,
posY_for_centerd_crop, newWidth, newHeight);
ret = srcImage.Clone(imageCenterRect, srcImage.PixelFormat);
return ret;
}
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