PerspectiveTransform | Calculate CATransform3D between two Perspectives | Math library

I have found a perspective matrix using:

I have two shapes or coordinate systems, and I want to be able to transform points from one system onto the other.

I have found that if the shapes are quadrilateral and I have 4 pairs of corresponding points then I can calculate a transformation matrix and then use that matrix to calculate any point in Shape B onto it's corresponding coordinates in Shape A.

Here is the working python code to make this calculation:

I am working on a project that consists of my code recognizing an image of a sudoku puzzle and then solving it. I am working on the image recognition part right now. It was working fine until I realized that I had been making the whole program flipped on the y axis. So I had replaced

I have two satellite images (02 bands), i want to align it based on delaunay transformation. the aim is getting an image RGB high-quality.

Note: this code success by CV2.PerspectiveTransform Function but i want another transformation for more accuracy.

I'm trying to do relatively simple code where I extract contours of some areas in the image and draw 1 or multiple rectangles on them (normally with a "Object Detection model") (works fine). However, I then need to transform the coordinates of the rectangles drawn on the cropped areas back to the original image (and draw them over it to make sure the conversion went well) (which is not the current case).

The problem I'm having is probably related to the way I calculate the transformation matrix for the final cv2.getPerspectiveTransform, but I can't find the right way to do it yet. I have tried with the coordinates of the original system (as in the example below) or from the coordinates of the boxes that were drawn, but none seem to give the expected result.

The example presented is a simplified case of drawing boxes since normally, the coordinates of these will be given by the AI model. Also, one cannot simply reuse cv2.warpPerspective on the drawn images since the main interest is to have the final coordinates of the drawn boxes.

Starting image:

Result for the first extracted rectangle (good):

Result for the second extracted rectangle (good):

Result for the starting image with the rectangle drawn (wrong result):

I have an array of coordinates that mark an area on the floor.

I want to generate a new array where all the coordinates are transformed, so that I get a warped array. The points should look like the following image. Please note that I want to generate the graphic using the new array. It does not exist yet. It gets generated after having to new array.

I know the distance between all coordinates if it helps. The coordinates json looks like this, where distance_to_next contains the distance to the next point in cm:

i need to make a panoramic view from serie of pictures (3 pictures). After that i created orb, detected and computed keypoints and descriptors for the three picture, i matched the most likely similars keypoints between:

1. image 1 and image 2

2. image 2 and image 3

Then i know to compute and find the panoramic view between only 2 images , and i do it between img1 and img2, and between img2 and img3. But Then for the last step , i want to find the panoramic view of theses 3 pictures using affine tranformation with Ransac algorithm from opencv. And i don't know to do that ( panoramic view for 3 pictures. So, I have to of course choose image 2 as the center of the panorama

I didn't find a good explanation or an enough good explanation for me in order to compute and fine the panoramic view of theses 3 pictures. Someone can help me please to implement what i need please ?

here is my code where i print panorama between img1 and img2, and between img2 and img3:

I have already visited as many answers on here about the System.AccessViolationException: 'Attempted to read or write protected memory. error and they all seem to be about something else that is not todo with pictures.

I am learning image processing but I am somewhat still learning the debugging of software. I am trying to search for an image inside another image using the featured based image detection with BRISK and the Brute force method. However for some reason every time I run and click the button2 I get the above error, I have no idea how to debug this. The exception is being thrown on the line matcher.KnnMatch(sceneDescriptor, matches, k); the value of matches is null when I hover over it.

I have used NuGet in visual studio 2019 to install Emgu.CV vs 4.5.1, Emgu.cv.bitmap, emgu.cv.runtime.windows 4.5.1. I have even tried changing my compile mode from x86 to x64. I have no idea what I am doing wrong.

File - myImgprocessing.cs:

I am trying to check if this image:

is contained inside images like this one:

I am using feature detection (SURF) and homography because template matching is not scale invariant. Sadly all the keypoints, except a few, are all in the wrong positions. Should I maybe trying template matching by scaling multiple times the image? If so, what would be the best approach to try and scale the image?

Code: