image-rotation

I've heard that it should be possible to do a lossless rotation on a jpeg image. That means you do the rotation in the frequency domain without an IDCT. I've tried to google it but haven't found anything. Could someone bring some light to this? What I mean by lossless is that I don't lose any additional information in the rotation. And of course that's probably only possible when rotating multiples of 90 degrees. mpenkov You do not need to IDCT an image to rotate it losslessly (note that lossless rotation for raster images is only possible for angles that are multiples of 90 degrees). The

Please take a look at this app snapshot: This is a bank application. it has 6 buttons around the bank logo. You can rotate the images by click-and-hold in one of them and move your finger in either direction (clockwise or counter-clockwise). So, for example, I can rotate them to put the Currency Convertor image in the place of the Login image. In my app, I have 6 Images too, I want to rotate them. How can I do that? Update: BTW, this is an iPhone app but I think it is not iOS-specific issue. Assuming you don't need to change the items in the "menu" (enable/disable/order/visibility) you can

I am working on a project for estimating a UAV (quadcopter) location using optical-flow technique. I currently have a code that is using farneback algorithm from OpenCV. The current code is working fine when the camera is always pointing to the ground. Now, I want to add support to the case when the camera is not pointing straight down - meaning that the quadcopter now has a pitch / roll / yaw (Euler angles). The quadcopters Euler angles are known and I am searching for a method to compute and apply the transformation needed based on the known current Euler angles. So that the result image

I need to implement image editor project. basically, I need to add some icons,text over an input image then export to final image. Is there any good tutorial for this? What you are searching is android-multitouch-controller . I have implemented in one of my application. It is working fine. It has following facility. Multi touch image scaling Multi touch image zooming single touch image panning There are 3 projects. In that "MTPhotoSortr" is one which I used. You need to check as per your requirement. 来源： https://stackoverflow.com/questions/16710066/android-how-to-scale-move-rotate-the

I'm trying to code a class to seam carve images in x and y direction. The x direction is working, and to reduce the y direction I thought about simply rotating the image 90° and run the same code over the already rescaled image (in x direction only) and after that, rotate it back to its initial state. I found something with AffineTransform and tried it. It actually produced a rotated image, but messed up the colors and I don't know why. This is all the code: import java.awt.image.BufferedImage; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.io.File;