Kinematics with Video Processing!

A video is just a series of image frames shown in succession. Thus, processing a video is just processing all the image frames one by one. In this activity, we use image processing of the image frames to get the acceleration of a tennis ball rolling over a slide.

See details of dark images by manipulating histograms

Dark images are not at all dark. In fact, the details are captured by the camera but our eyes just do not see it. In this activity we show how we can manipulate the histogram of an image so that our eyes can see the details in the dark.

Play music sheets with image segmentation

In my previous  blog, I have shown how morphological operations in images works. I have also shown how we can apply it on image segmentation (differentiate cancer cells from normal cells). In this chapter, we try to read and play simple music sheets using image segmentation.

From morphological operations to cancer cells

Morphological operation is done on an image in order to change its shape and structure. Its concept is mainly based on set theory and topology. In this activity, we try to familiarize some basic operations and use them to measure size of “cancer cells”.

Segment images by color

In simple terms, image segmentation is the process of taking a small part of a whole image. Look at the image an apple below with red and green parts. One may use an imaging software such as Paint to separate the red part from the whole image by using the crop tool.

Enhancing images using Fourier Transform

In the previous blog, I have partly shown some applications of Fourier transform such as edge detection, template matching, etc. Here we show another application which is image enhancement.

Fourier Transform and its applications

The Fourier Transform is a method of converting a signal of dimension X to a signal of dimension 1/X. This method gives way to analyzing signals in terms and their frequencies  and provides an easy mathematical manipulation of functions.

Here we discuss the basic implementation of Fourier Transform in Scilab and its applications to images.

Estimating areas from images

One technique in estimating areas from images is through the use of Green’s Theorem. Given a closed region R on the xy plane, its area can be calculated as

Generating synthetic images using Scilab

Scilab is a programming platform that has similar functions with that of MATLAB, only that it’s open-source.

Images, in computer ‘language’, are just matrices of numbers corresponding to pixel values.  Scilab is a useful tool in manipulating images because it can do a lot of matrix operations with only a few lines of codes.

Finding values of digitally scanned plots

This activity is from one of my applied physics courses which deals with image processing methods.

Given digitally scanned plots such as hand-drawn historical or old plots or even the computer generated ones, you could get the values by simple ratio and proportion. This sounds so simple but takes a lot of time and focus.