The hierarchy returned by findContours has the following form: hierarchy[idx][{0,1,2,3}]={next contour (same level), previous contour (same level), child contour, parent contour} CV_RETR_CCOMP, returns a hierarchy of outer contours and holes. This means elements 2 and 3 of hierarchy[idx] have at most one of these not equal to -1: that is, each element has either no … Read more
Try to check the encoding of the JPEG. ImageIO can’t read CMYK-encoded jpeg images for example. AFAIK, ImageIO hasn’t been updated for years, so you’d like to try and use the official alternative/extension: JAI ImageIO. Unforutnately, JAI ImageIO needs some native libraries installed into the JRE, which might be unwanted. We do the following: use … Read more
The trouble looks like the image isn’t square and the browser adjusts as such. After rotation ensure the dimensions are retained by changing the image margin. .imagetest img { transform: rotate(270deg); … margin: 10px 0px; } The amount will depend on the difference in height x width of the image. You may also need to … Read more
So it turns out that the problem comes from one line in modules\imgproc\src\imgwarp.cpp: CV_Assert( ssize.area() > 0 ); When the product of rows and columns of the image to be resized is larger than 2^31, ssize.area() results in a negative number. This appears to be a bug in OpenCV and hopefully will be fixed in … Read more
It appears that the OP is requesting how to do data islands in JavaScript, specifically for images. None of the answers previously given provide such a method, so here you go. Basically, you encode the image as a base64 string and then set that as the source of a DOM element. Setting the source of … Read more
This is the code I use. It supports rotation, and also sets the image resolution to the JPEG standards of 72dpi@24-bit color (by default GDI+ saves images at 96dpi@32-bit color). It also fixes the black/gray border problem that some people experience when resizing images. /// <summary> /// Resizes and rotates an image, keeping the original … Read more
You need to set the Image’s render options. Try setting the style of the Image to: <Window.Resources> <Style TargetType=”Image”> <Setter Property=”Height” Value=”64″ /> <Setter Property=”Width” Value=”64″ /> <Setter Property=”RenderOptions.BitmapScalingMode” Value=”HighQuality” /> </Style> </Window.Resources> To use the image, simply call as before: <Image Source=”/Images/MyImage.png” /> Or, to use the RenderOptions on a single image: <Image RenderOptions.BitmapScalingMode=”HighQuality” … Read more