imerase
Description
Examples
Erase Pixels from Random Window
Read and display an image.
I = imread("peppers.png");
imshow(I)
Select a rectangular region of size 50-by-100 pixels from a random location in the image.
rect = randomWindow2d(size(I),[50 100]);
Erase the pixels from within the rectangular region.
J = imerase(I,rect);
Display the erased image. The erased pixels have the value 0
.
imshow(J)
Erase Pixels from Specified Window
Read and display an image.
I = imread("car1.jpg");
imshow(I)
Specify the size and position of the erase rectangle as a 4-element vector of the form [xmin ymin width height].
rect = [1040 1525 250 200];
Erase the pixels from within the rectangular region, and fill the erased pixels with the color green.
J = imerase(I,rect,"FillValues",[0 255 0]);
Display the erased image.
imshow(J)
Fill Erased Region with Random Colors
Read and display a color image.
I = imread('flamingos.jpg');
imshow(I)
Select a random square window from the image. The area of the window is between 2% and 13% of the area of the entire image.
win = randomWindow2d(size(I),"Scale",[0.02 0.13],"DimensionRatio",[1 1;1 1]);
Determine the height and width of the erase region.
hwin = diff(win.YLimits)+1; wwin = diff(win.XLimits)+1;
Erase the pixels within the erase region. Fill each pixel with a random color.
J = imerase(I,win,"FillValues",randi([1 255],[hwin wwin 3]));
Display the erased image.
imshow(J)
Input Arguments
I
— Image with region to be erased
numeric matrix | numeric array
Image with a region to be erased, specified as a numeric matrix representing a grayscale image or a numeric array with three channels representing a color image.
rect
— Size and position of erase rectangle
4-element numeric vector | Rectangle
object
Size and position of the erase rectangle, specified as a 4-element numeric vector of
the form [xmin
ymin
width
height] or a Rectangle
object.
fillValues
— Fill value
0
(default) | numeric scalar | 3-element numeric vector | numeric matrix | numeric array
Fill value to apply to erased pixels, specified as one of these values.
Fill Value | Result |
---|---|
numeric scalar | Fill erased pixels of a grayscale or RGB image with the specified gray value. |
3-element numeric vector | Fill erased pixels of an RGB image with the specified color. |
numeric matrix | Fill each erased pixel of a grayscale or RGB image with the corresponding
gray value in fillValue . The matrix specified by
fillValue must have the same height and width as the
erase rectangle, rect . |
numeric array with 3 planes | Fill each erased pixel of an RGB image with the color in the corresponding
pixel of fillValue . The array specified by
fillValue must have the same height and width as the
erase rectangle, rect . |
Output Arguments
Ierased
— Image with erased region
numeric matrix | numeric array
Image with erased region, returned as a numeric matrix or numeric array of the same
size as the input image, I
.
Version History
Introduced in R2021a
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