I would like to pass the image file into OpenCV to create a NumPy array without unzipping it. My code looks like this: The place where I put a * is what I’m not sure what to pass in. I have created a few variables of class Pillow Image (pil_img), and ZipFileExt (zip_img). I understand that cv2.imread on…
Tag: opencv
How to save a full size image with RGB and float32?
I have an image array with RGB, np.float32, and values in the range of 0 … 1. When I multiply the array with 255, and use cv2.imwrite, the output is not correct. When I use plt.imshow(img.astype(np.float32)), the output is right, but the image size is too small. How can I output a good image? Answer The…
Fill a rectangle area with an image
I have a code from OpenCV docs regarding template matching as follows: Right now the rectangle drawn on my image is not filled, I would like to fill the area of the cv2.rectangle with some image. How to achive this? Answer If you are filling the rectangle with the template image, then the dimensions of the te…
How do I run a video in a PyQt container?
In the QVideoWidget container on PyQt, you need to start a video from the computer, on which objects are to be searched through TensorFlow (openCV, cv2). The problem is that when the button is pressed, the video only shows one frame and nothing else. What could be the problem? Made in PyCharm, Python 3.7. Ans…
How to crop white patches in image and make passport size photo using OpenCV
I have images that need to be cropped to perfect passport size photos. I have thousands of images that need to be cropped and straightened automatically like this. If the image is too blur and not able to crop I need it to be copied to the rejected folder. I tried to do using haar cascade but this approach is
Efficiently render 3D numpy bitmap array (y, x, RGB) to window on macOS (using openCV or otherwise)
I’m rendering a dynamically changing numpy bitmap array and trying to improve my framerate. Currently I’m using openCV: This takes ~20ms, which is not bad. But can I do better? Setting this has no noticeable effect. But does openCV offer a better technique than imshow to make use of a GL drawing s…
How can I make an object that follows a route?
I have a red point where I can move around and a blank background that I can edit as I want. My goal is to move this point according to the route I will draw on the background.I can take my center point, plot or detect my route, but I have no idea how this point can follow this route.
TypeError: img should be PIL Image. Got – PyTorch
I’m trying to prepare some image data for my neural to classify. As part of the image preprocessing step, I’m applying the HOG filter in my dataset class as such: After this, I define my train and validation transformation as such: and finally, I create the loaders as such: However, when I attempt…
How to read image from S3 using OpenCV (cv2.imread)?
I am having trouble reading images from the S3 bucket. I can read images locally like that. But I have no idea why S3 said error Answer You need to first establish a connection to S3, then download the image data, and finally decode the data with OpenCV. For the first bit (connecting to S3), Boto3 is a good a…
Unable to deploy python program with cx_freeze due to cv2
So I have a fairly large python program that I want to port to other machines (ubuntu 18.04) without having to install all the python packages and dependencies for each machine, I chose to use cx_Freeze for this and it seems to build the project fine into a single executable but the executable crashes when ca…