$1.$ Image Contrast Adjustment

Questions $1-5$ will use the image $00035.$jpg from the Concrete Crack data set.

Import the image and convert it to grayscale. Segment the image using the imbinarize function with the default settings. The lighter background will be selected as the foreground. Invert the image so that the crack is selected as the foreground. This mask will be the baseline for this set of questions.

How many pixels are in the crack?

Question $2$

Adjust the contrast of the grayscale image $00035.$jpg by stretching the histogram. Then perform the same segmentation and inversion as in Question $1.$

How many pixels are in the crack in this segmentation?

Question $3$

Equalize the image histogram of the grayscale image $00035.$jpg$.$ Perform the same segmentation and inversion as in Question $1.$

How many pixels are in the crack in this segmentation?

Question $4$

Perform adaptive histogram equalization on the grayscale image $00035.$jpg$.$ Perform the same segmentation and inversion as in Question $1.$

How many pixels are in the crack in this segmentation?

Question $5$

Which of the four segmentations above best captures the crack?

a$.$No adjustment

b$.$Contrast adjustment

c$.$istogram equalization

d$.$Adaptive histogram equalization

Question $6$

Brightening An Image

Use the imlocalbrighten function to increase the brightness of the car$\_3.$jpg image. Calculate the difference in the average luminance of the image before and after the transformation.

Recall: to find the average luminance, find the luminance value of each pixel by converting the image to grayscale, then average the resulting values.

Question $7$

Adjusting a Single Color Plane

Load the car$\_2.$jpg image and convert it to the HSV color space. Perform histogram equalization on the Value color plane. Calculate the difference between the average luminance of the image before and after the transformation.

Recall: Converting an image from RGB to HSV changes the data type from uint$8$ to double. You will need to convert the equalized image back to RGB AND convert the data type back to uint$8.$

Question $8$

Snow Removal

Use the imreducehaze function to remove some of the snow and frost from the mountain$2.$jpg image. Calculate the difference between the average luminance of the image before and after the transformation.

Note: In this case, we are darkening the image, so the average luminance will be lower in the transformed image. Enter a positive value for the difference in the average luminance values.

Question $9$

Counting Objects

How many guitar picks are present in picks.jpg$?$