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l33tminion) wrote2004-07-07 06:41 pm
l33tminion) wrote2004-07-07 06:41 pm
Entry tags:
The Israeli Attitude
I received my assignment today, and got my first choice project.
We spent the morning working on image editing using Matlab and filters. I also began working on the image completion problem (the cat sample problem, see previous link), but that one's going to take a while.
Using Filters in Image Editing:
A filter is a matrix (two dimensional array of numbers) that is used to perform operations on other matrices (images are represented as a matrix of values (three matrices for color pictures)). The filter performs some operation on each pixel based on the values of surrounding pixels. The two kinds of filters we worked with today are used to remove "noise" (bad data) from digital images, smoothing the images. The average (mean) filter makes each pixel in the filtered image equal to the mean value of itself and the surrounding pixels in the original image. The median filter is much more effective at removing noise and preserving edges, making each pixel in the filtered image equal to the median of the surrounding pixels in the original image.
MATLAB:
Matlab is actually a fairly simple programming language. You can run commands individually or write functions (that take parameters) or scripts (lists of commands) to run more complex operations. Matlab treats all numerical variables as matrices and is ideally suited to matrix operations, which makes it good at processing digital images, among other things. Olin students use Matlab in their engineering classes, so it's good to be able to get some experience with it before the start of college.
In the afternoon there was a lecture that was supposed to serve as an introduction to the country of Israel (mostly stuff I knew already).
A few unrelated points:
- The cabin I stay in is nice and air-conditioned. (Unfortunately, however, it is infested with cockroaches.)
- The food at camp is also really good (there are tomatoes or Israeli salad (chopped cucumber and tomato, mostly)) at every meal.
Currently reading: Do Androids Dream of Electric Sheep? by Philip K. Dick
We spent the morning working on image editing using Matlab and filters. I also began working on the image completion problem (the cat sample problem, see previous link), but that one's going to take a while.
Using Filters in Image Editing:
A filter is a matrix (two dimensional array of numbers) that is used to perform operations on other matrices (images are represented as a matrix of values (three matrices for color pictures)). The filter performs some operation on each pixel based on the values of surrounding pixels. The two kinds of filters we worked with today are used to remove "noise" (bad data) from digital images, smoothing the images. The average (mean) filter makes each pixel in the filtered image equal to the mean value of itself and the surrounding pixels in the original image. The median filter is much more effective at removing noise and preserving edges, making each pixel in the filtered image equal to the median of the surrounding pixels in the original image.
MATLAB:
Matlab is actually a fairly simple programming language. You can run commands individually or write functions (that take parameters) or scripts (lists of commands) to run more complex operations. Matlab treats all numerical variables as matrices and is ideally suited to matrix operations, which makes it good at processing digital images, among other things. Olin students use Matlab in their engineering classes, so it's good to be able to get some experience with it before the start of college.
In the afternoon there was a lecture that was supposed to serve as an introduction to the country of Israel (mostly stuff I knew already).
A few unrelated points:
- The cabin I stay in is nice and air-conditioned. (Unfortunately, however, it is infested with cockroaches.)
- The food at camp is also really good (there are tomatoes or Israeli salad (chopped cucumber and tomato, mostly)) at every meal.
Currently reading: Do Androids Dream of Electric Sheep? by Philip K. Dick