c++ - OpenCV logo recognition - Stack Overflow
Jul 12, 2015 · If your logo occupies say 90% of the image, you don't need detection, since you are probably good with color histograms. If the logo is small compared to the image, you should "find" the logo, in order to focus your comparison on that and not on the background clutter.
opencv - Logo detection/recognition in natural images - Stack …
Nov 25, 2014 · The logo may be quite small in the image, it can appear in clothes, hats, shoes, background wall etc. I have tried SIFT feature for matching without any other preprocessing, and the result is good for cases in which the size of the logo in images is big and the logo is clear. However, it fails for some cases where the scene is quite cluttered ...
opencv - Add transparent logo to 2D 16bit image array python …
Feb 19, 2019 · This is part of the image i'm getting: but I don't need the black background as the original logo is transparent. Sorry had to crop out the logo! And if it helps, here is a print of the array passed to add_logo, it's a numpy array: [[3505 3514 3606 ... 4622 4781 0] [3566 3507 3503 ... 4587 4386 0] [3522 3503 3453 ... 4584 4434 0] ...
Inserting Logo in an image - OpenCV Q&A Forum
I want to insert logo in an image. For that I tried below code: import cv2 import numpy as np img1 = cv2.imread('xyz.JPG') img2 = cv2.imread('logo.JPG') rows,col,channel = img2.shape roi = img1[0:rows,0:col] img2g = cv2.cvtColor(img2,cv2.COLOR_BGR2GRAY) ret, mask = cv2.threshold(img2g,180,255,cv2.THRESH_BINARY_INV) mask_inv = cv2.bitwise_not(mask) …
How to add an image to a video using OpenCv in Python?
Feb 9, 2021 · import cv2 import numpy as np # load image and start video foreground = cv2.imread('logo.jpg') cap = cv2.VideoCapture("video.mp4") # init font font = cv2.FONT_HERSHEY_SIMPLEX # position of logo on video top_left = [0, 0] # the top-left corner of your logo goes here tx = top_left[0] # less typing later ty = top_left[1] # crop of logo left = 0 ...
How to detect logos inside an image - OpenCV Q&A Forum
Jan 15, 2018 · Sure I'm detecting a logo but many say to use template matching which clearly won't work for me due to rotation, stretching etc, also the fact that I have multiple logos to try and match which potentially none of them will match. Also there is no way I have found of obtaining the logos from an image.
Logo detection / identification on TV screens - OpenCV Q&A Forum
Jul 31, 2013 · First I assume the logo position is fixed, so the exact logo region is cropped out and matched agains a prepared template, this can output promising identification. But the logo position turns out to be NOT fixed, i.e., there is some shift. I have to match the template against a larger area, and this does not guarantee correct result.
machine learning - Logo recognition in images - Stack Overflow
OpenCV. It worked, but was not an optimal solution for our needs. Our source images (where we were looking for the logo) were a fixed size and only contained the logo. Because of this we were able to use cvMatchShapes with a known good match and compare the value returned to …
Logo detection in screenshot - OpenCV Q&A Forum
May 15, 2018 · I thought I could use feature matching however this has over matched each logo on each screenshot, providing the same number of matches for a logo on the page vs a logo not on the page. I also tried matching with FLANN but got 0 matches. Results are as follows: AT&T logo in AT&T page (basic feature matching) C:\fakepath\image0.png
Exercise Problem: Bitwise Operations. - OpenCV Q&A Forum
Jan 29, 2019 · I want to put OpenCV logo above an image. If I add two images, it will change color. If I blend it, I get an transparent effect. But I want it to be opaque. If it was a rectangular region, I could use ROI as we did in last chapter. But OpenCV logo is a not a rectangular shape.