MATLAB programming question dealing with image manipulation

Question: Request edge to be cropped (1. top, 2. left, 3. right, 4. bottom), and number of pixels to开发者_如何学编程 remove and does it. Implement as a function: pic_new = crop_image(pic,direction,pixels);

How do I go about making a function with the indicated inputs? I know there is a function called imcrop() but I can't seem to get it to work. Please help. Thank you for your time.

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But imcrop is the exact function you need to use. In your case, it should be like this:

First, construct a rectangle by coordinates and it's height and width:

x = 50 
y = 50
height = 20
width = 20 

Then, load and crop the image:

I = imread('image.png');
I2 = imcrop(I, [x, y, height, width]);
imshow(I), figure, imshow(I2)

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You begin a function definition like this:

function [out1, out2] = my_func(in1, in2, in3)

You can handle a range of behaviours based on the value of variable like this:

switch (x)
    case 1
        % Stuff for x==1
    case 2
        % Stuff for x==2
    case 3
        % Stuff for x==3
    otherwise
        % Stuff for all other values of x
end

You can remove elements from an array like this:

matrix_out = matrix_in(x1:x2, y1:y2, :);

(Remember that an image is usually represented as a 2D array (or 3D if it's RGB).

This should be enough to answer your question. If it's not, you need to be more clear about what you want to do.