image-processing

问题 My problem is as follows: I have the picture of a half cylinder taken from a horizontal perspective and it has square grid lines on it, so I was wondering how can I implement in MATLAB to unwrap this half cylinder so all my grid cells become the same size? I know I will loose lots of resolution in the edge cells and a simple linear interpolation should do the trick, but I do not know how to tell MATLAB to do this. Also I know the geometrical properties of the cylinder, radius and height. Any

问题 My problem is as follows: I have the picture of a half cylinder taken from a horizontal perspective and it has square grid lines on it, so I was wondering how can I implement in MATLAB to unwrap this half cylinder so all my grid cells become the same size? I know I will loose lots of resolution in the edge cells and a simple linear interpolation should do the trick, but I do not know how to tell MATLAB to do this. Also I know the geometrical properties of the cylinder, radius and height. Any

问题 My problem is as follows: I have the picture of a half cylinder taken from a horizontal perspective and it has square grid lines on it, so I was wondering how can I implement in MATLAB to unwrap this half cylinder so all my grid cells become the same size? I know I will loose lots of resolution in the edge cells and a simple linear interpolation should do the trick, but I do not know how to tell MATLAB to do this. Also I know the geometrical properties of the cylinder, radius and height. Any

问题 I want to load more than 10000 images in my 8gb ram in the form of numpy arrays.So far I have tried cv2.imread,keras.preprocessing.image.load_image,pil,imageio,scipy.I want to do it the fastest way possible but I can't figure out which on is it. 回答1: One of the Fastest way is to get your multiprocessors do your job in Parallel it asks for parallelisation of your desired job, it brings multiple processors to work on your tasks at the same time when concurrent running isn't an issue. This

问题 I am trying to make a transparent image and draw on it, and after I will addWeighted over the base image. How can I initialize fully transparent image with width and hight in openCV python? EDIT: I want to make a effect like in Photoshop, having stack of the layers, all stacked layers are initially transparent and drawing is performed on fully transparent layer. On the end I will merge all layers to get final image 回答1: If you want to draw on several "layers" and then stack the drawings

问题 I need to find a fast way to convert a binary file to an image. The binary file consist of a N N N matrix and I want to associate 0 to a color and 1 to a different color. I need to perform this operation to more then 1000 binary files. If possible I'd like to avoid using MatLab, is there any tool/software (for unix) that would help me? EDIT: This is exactly what I was looking for! On the bottom of the page it says: "TIP: To process many files, use a shell script to pass this URL and your

问题 I am using opencv module to read and write the image. here is the code and below is the image i am reading and second image is after saving it on disk using cv2.imwrite(). import cv2 img = cv2.imread('originalImage.jpg') cv2.imwrite('test.jpg',img) It is significantly visible that colors are dull in second image. Is there any workaround to this problem or I am missing on some sort of setting parameters..? 回答1: The difference is that the initial image (on the left in the diagram) has an

问题 I am using opencv module to read and write the image. here is the code and below is the image i am reading and second image is after saving it on disk using cv2.imwrite(). import cv2 img = cv2.imread('originalImage.jpg') cv2.imwrite('test.jpg',img) It is significantly visible that colors are dull in second image. Is there any workaround to this problem or I am missing on some sort of setting parameters..? 回答1: The difference is that the initial image (on the left in the diagram) has an

问题 I am using opencv module to read and write the image. here is the code and below is the image i am reading and second image is after saving it on disk using cv2.imwrite(). import cv2 img = cv2.imread('originalImage.jpg') cv2.imwrite('test.jpg',img) It is significantly visible that colors are dull in second image. Is there any workaround to this problem or I am missing on some sort of setting parameters..? 回答1: The difference is that the initial image (on the left in the diagram) has an

问题 public static System.Drawing.Image GenerateGiftCard(String text, Font font, Color textColor) { System.Drawing.Image img = Bitmap.FromFile(@"G:\xxx\images\gift-card.jpg"); Graphics drawing = Graphics.FromImage(img); //measure the string to see how big the image needs to be SizeF textSize = drawing.MeasureString(text, font); //create a brush for the text Brush textBrush = new SolidBrush(textColor); float x, y; x = img.Width / 2 - textSize.Width / 2; y = img.Height / 2 - textSize.Height / 2;