4a 

imm=imread('C:\Users\home\Desktop\3BR20AI014\tree.jpg');
title("ORIGINAL IMAGE")
imshow(imm)
show_window(1);
im=rgb2gray(imm);
title("GRAY IMAGE")
imshow(im)
show_window(2);
title("SOBEL EDGE IMAGE")
E=edge(im,'sobel');
imshow(E);
show_window(3);
title("CANNY EDGE IMAGE")
E=edge(im,'canny',[0.06,0.2]);
imshow(E);
show_window(4);
title("PREWITT EDGE IMAGE")
E=edge(im,'prewitt');
imshow(mat2gray(E));

4b
texture=imread('C:\Users\home\Desktop\1.jpg');

subplot(2,2,1);
imshow(texture);
title('Original Image');

gray_texture = rgb2gray(texture);

subplot(2,2,2);
imshow(gray_texture);
title('Grayscale Texure');

sigma= 2;
gaussian_kernal=fspecial('gaussian',[5,5],sigma);
gaussian_filtered= imfilter(gray_texture,gaussian_kernal,'replicate');

subplot(2,2,3);
imshow(gaussian_filtered);
title('Gaussian Filtered')