MATLAB Reading Image Data from TXT ***

# 1. Reading Image Data from TXT Files in MATLAB**

MATLAB offers various methods for reading image data, including reading from TXT files. A TXT file is a text file containing the numerical representation of image data. To read image data from a TXT file, you can use the `imread()` function.

% Reading image data from a TXT file
data = load('image.txt');

% Creating an image matrix
image = reshape(data, [height, width]);

In the code above, `image.txt` is the TXT file containing the image data, and `height` and `width` are the height and width of the image. The `imread()` function loads the data from the TXT file into MATLAB and converts it into the image matrix `image`.

# 2. Display and Basic Operations of Images

### 2.1 Reading and Displaying Images

**Code Block:**

% Reading the image
image = imread('image.jpg');

% Displaying the image
imshow(image);

**Code Logic Analysis:**

* The `imread` function reads the image file and stores it in the `image` variable.
* The `imshow` function displays the image.

**Parameter Explanation:**

* `imread`:
* `filename`: The path to the image file.
* `imshow`:
* `image`: The image to be displayed.

### 2.1.2 Image Conversion and Processing

**Code Block:**

% Converting the image to grayscale
gray_image = rgb2gray(image);

% Resizing the image
resized_image = imresize(image, [256, 256]);

% Rotating the image
rotated_image = imrotate(image, 45);

**Code Logic Analysis:**

* The `rgb2gray` function converts a color image to a grayscale image.
* The `imresize` function adjusts the size of the image.
* The `imrotate` function rotates the image.

**Parameter Explanation:**

* `rgb2gray`:
* `image`: The color image to be converted.
* `imresize`:
* `image`: The image to be resized.
* `newSize`: The new size of the image.
* `imrotate`:
* `image`: The image to be rotated.
* `angle`: The rotation angle in degrees.

# 3. MATLAB Image Processing Practice

### 3.1 Reading, Writing, and Displaying Images

#### 3.1.1 Reading Image Data from TXT Files

MATLAB provides the `dlmread` function to read data from TXT files. For image data, you need to specify the data type as `uint8`, which represents an unsigned 8-bit integer, to match the format of the image data.

% Reading image data from a TXT file
data = dlmread('image.txt', ' ', [***], 1, 0);

- `'image.txt'`: The path to the TXT file
- `' '`: Delimiter, indicating that the data is separated by spaces
- `[***]`: Data range, indicating that the range of image data is 0-255
- `1, 0`: Skip the first row, do not read the header row

#### 3.1.2 Displaying and Saving Images

After reading the image data, you can use the `imshow` function to display the image and the `imwrite` function to save the image.

% Displaying the image
imshow(data);

% Saving the image
imwrite(data, 'image.jpg', 'jpg');

- `imshow(data)`: Displays the image `data`
- `imwrite(data, 'image.jpg', 'jpg')`: Saves the image `data` as a JPEG file with the file name `image.jpg`

### 3.2 Image Enhancement and Processing

#### 3.2.1 Image Grayscale Transformation

Grayscale transformation can adjust the brightness and contrast of an image. MATLAB provides the `imadjust` function for grayscale transformation.

% Grayscale transformation, adjusting contrast
data_adjusted = imadjust(data, [0.2 0.8], []);

% Displaying the adjusted image
imshow(data_adjusted);

- `imadjust(data, [0.2 0.8]