$1$:$15$

Done

Lab$1.$pdf

$8.$ For the following exercises create script called Lab$1$RectWindow.

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a$)$ The script should read in the image peppers.png$,$ and use two mouse clicks and the command ginput to select and save part of the image in a given rectangular window. The two mouse clicks must identify the top left and bottom right corners of this window. The sub$-$image, i$.$e$.$ the image in the rectangular window must then be saved to a specific file. The script should display the original image and the sub$-$image in separate windows.

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Now use your script to pull out and save the part of the image in the smallest rectangular window that contains the yellow colored pepper in the middle of the image.

Test that you have written out the image correctly.

$9.$ Write a script Lab$1$UpsideDown to read in the image peppers.png and display it upside down.

$10.$ Write a script Lab$1$Interpolate for the following problems.

$($a$)$ Save the image file Chronometer.tif to your working folder and read in this file into an array.

$($b$)$ Downsample this image by $2^k$:$1$ in the vertical and horizontal directions $($your script should allow you to set the value of $k$ to one of the values $2,3,4).$ Store the downsampled image in a separate array. You will find it helpful to convert your image to type double, using the Matlab function im$2$double.

$($c$)$ Read the doc page for the Matlab function interp$2$ and use this to interpolate $($upsample$)$ the downsampled image back to its original size $($it won't be exactly the same size as the original, but will be close$).$

$($d$)$ Display the original image and the interpolated image simultaneously.

$($e$)$ Set $k=2$ and determine which of the interpolation options is best, from a visual point of view.

$($f$)$ Repeat the observations for $k=3$ and $k=4.$

$($g$)$ Show your work, and describe your observations.

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