You can use the "imwarp" function in MATLAB to warp an image into a trapezoidal shape. Here is an example code:

% Load the image
img = imread('your_image_file.jpg');

% Define the corners of the trapezoid in the original image
src_pts = [x1, y1; x2, y2; x3, y3; x4, y4];

% Define the corners of the rectangle to which the trapezoid will be mapped
dst_pts = [x1, y1; x2, y2; x3, y3; x4, y4];

% Compute the perspective transformation matrix
tform = fitgeotrans(src_pts, dst_pts, 'projective');

% Apply the transformation to the image
trapezoidal_img = imwarp(img, tform);

% Display the original and transformed images side by side
figure;
subplot(1,2,1);
imshow(img);
title('Original image');
subplot(1,2,2);
imshow(trapezoidal_img);
title('Trapezoidal image');

You need to define the four corners of the trapezoid in the original image as "src_pts", and the corresponding four corners of the rectangle to which the trapezoid will be mapped as "dst_pts". The "fitgeotrans" function computes the perspective transformation matrix that maps the source points to the destination points. The "imwarp" function applies the transformation to the image. Finally, the original and transformed images are displayed side by side using the "subplot" and "imshow" functions.

https://matlabhelpers.com/simulink-applications.php