Image Processing in MATLAB

04/12/2023

DOES - PC

Sine Wave:

An image in MATLAB is treated as a matrixEvery pixel is a matrix element

• MATLAB can import/export several image formats– BMP (Microsoft Windows Bitmap)– GIF (Graphics Interchange Files)– HDF (Hierarchical Data Format)– JPEG (Joint Photographic Experts Group)– PCX (Paintbrush)– PNG (Portable Network Graphics)– TIFF (Tagged Image File Format)– XWD (X Window Dump)– MATLAB can also load raw-data or other

types of image data

Image Processing Toolbox Functions:

•adjust the contrast•create contours •create histograms•manipulate regions of interest •degraded images•detect and measure features•analyze shapes and textures•adjust color balance

•image enhancement•image deblurring•feature detection•noise reduction•image segmentation•geometric transformations•image registration•explore an image•examine a region of pixels

Basic Commands:

1) Read and Display an Image:

>> I= imread(‘A.png');

>> imshow(I)

>> whos Name Size Bytes Class

I 349x356x3 372732 uint8 array

2) Basic Operations on a Rice Image:

>> I = imread('rice.png');>> imshow(I)

>> background = imopen(I,strel('disk',15));>> figure, imshow(background)

>> I2 = imsubtract(I,background);>> figure, imshow(I2)

>> I3 = imadjust(I2);>> figure, imshow(I3