image-rotation

I have some hundreds of images (scanned documents), most of them are skewed. I wanted to de-skew them using Python. Here is the code I used: import numpy as np import cv2 from skimage.transform import radon filename = 'path_to_filename' # Load file, converting to grayscale img = cv2.imread(filename) I = cv2.cvtColor(img, COLOR_BGR2GRAY) h, w = I.shape # If the resolution is high, resize the image to reduce processing time. if (w > 640): I = cv2.resize(I, (640, int((h / w) * 640))) I = I - np.mean(I) # Demean; make the brightness extend above and below zero # Do the radon transform sinogram =

What I Have I have an arrow image (like the left one). When the user clicks on it, it should rotate 180 degree with an animation and should look like the right one. What I Have Done private void rotate(float degree, final int toggleV) { final RotateAnimation rotateAnim = new RotateAnimation(0.0f, degree, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); rotateAnim.setDuration(500); toggle.startAnimation(rotateAnim); rotateAnim.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public

Hi all, I have written an application where I have a speedometer with a needle vertically set at 90 degree and I am trying to rotate the needle around its center with the speed that changes for every one second(I am displaying the speed in a text view that changes randomly from 0 to 120) I am getting the speed from a remote service and displaying in a textview. so as the speed changes the speedometer needle gauge should change accordingly around its center. I mean If speed is 30 the needle should be at 30 and so on in speedometer. My code is not working exactly, How to get around this problem?

How can I straighten a tilted square shape in an image? I do not know the angle with which it is tilted and the code must calculate it and then rotate it automatically. For example, I have the following image: which should be rotated to give the following output image: A simple way using only the top and bottom corners. Note that this approach relies on the upper and lower most corners: i = imread('sq.jpg'); i_bw = im2bw(i)==0; % Modify the strel as required se = strel('square', 10); i_ed = imopen(i_bw, se); limits = sum(i_ed, 2); top_y = find(limits>0, 1); bottom_y = find(limits>0, 1, 'last')

I have an image and I have to rotate it by 45, 90, 135, 180 degrees. What I am doing: try { BufferedImage src = ImageIO.read(new File("src.png")); double ang = Math.toRadians(90); AffineTransform t = new AffineTransform(); t.setToRotation(ang, src.getWidth() / 2, src.getHeight() / 2); AffineTransformOp op = new AffineTransformOp(t, null); BufferedImage dst = new BufferedImage(src.getWidth(), src.getHeight(), src.getType()); op.filter(src, dst); ImageIO.write(dst, "png", new File("output.png")); } catch(Exception ex) { ex.printStackTrace(); } The problem is that image changes its position and

When I try to rotate an image it appears that a part of the background turns black (my images are transparents) Background white Part of background turns black Here's the code that rotate the image : public BufferedImage rotate(int height, int width, BufferedImage originalImg, int angle) { BufferedImage rotateImage = null; try { rotateImage = new BufferedImage(height, width, BufferedImage.TYPE_INT_RGB); AffineTransform a90 = AffineTransform.getRotateInstance(Math.toRadians(angle), height / 2, width / 2); AffineTransformOp op90 = new AffineTransformOp(a90, AffineTransformOp.TYPE_BILINEAR); op90

I'm rotating an ImageView with postRotate(float degrees, float px, float py), setting px and py to a few differnt values including (0,0) and (imgView.getHeight(),imgView.getWidth()) but it refuses to rotate around any other point than the center. I'm wondering whether it's got anything to do with the fact that my gravity is center in the LinearLayout? My layout: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center"> <ImageView android:id="@+id