replace selected area with in paint in matlab

To replace a selected area within an image using Matlab, you can use the following steps:

1. Read the image using imread() function.

main.m
img = imread('input_image.png');
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2. Use the imfreehand() function to draw the region of the image to be replaced. This function creates an ROI (region of interest) object that you can use to manipulate the selected area.

main.m
h = imfreehand();
binaryMask = h.createMask();
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3. Modify the selected area in the binary mask as per your requirements.

4. Replace the selected area in the input image with a new value using the binary mask generated earlier.

main.m
img(binaryMask) = new_value;
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5. Display the modified image using imshow() function.

main.m
imshow(img);
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Here new_value can be a scalar value for grayscale images or a three-element vector for RGB images. The selected area in the input image will be replaced with this new value.

For more information on these functions, you can refer to the Matlab documentation.