Median filter: Difference between revisions
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pack [labelframe .dst -text Median] -side left
pack [label .dst.l -image [medianFilter teapot]]</lang>
=={{header|Wren}}==
{{libheader|DOME}}
This follows the Wikipedia pseudo-code for the median filter, sorting the colors by their luminance, and displays the 'before' and 'after' images side by side on the canvas. Results are as expected though remaining corruption seems more prominent than on Wikipedia image.
<lang ecmascript>import "graphics" for Canvas, ImageData, Color
import "dome" for Window
class MedianFilter {
construct new(filename, filename2, windowWidth, windowHeight) {
Window.title = "Median filter"
var image = ImageData.loadFromFile(filename)
Window.resize(image.width, image.height)
Canvas.resize(image.width, image.height)
_ww = windowWidth
_wh = windowHeight
// split off the left half
_image = ImageData.create(filename2, image.width/2, image.height)
_name = filename2
for (x in 0...image.width/2) {
for (y in 0...image.height) _image.pset(x, y, image.pget(x, y))
}
// display it on the left before filtering
_image.draw(0, 0)
}
luminance(c) { 0.2126 * c.r + 0.7152 * c.g + 0.0722 * c.b }
medianFilter(windowWidth, windowHeight) {
var window = List.filled(windowWidth * windowHeight, Color.black)
var edgeX = (windowWidth / 2).floor
var edgeY = (windowHeight / 2).floor
var comparer = Fn.new { |a, b| luminance(a) < luminance(b) }
for (x in edgeX..._image.width - edgeX) {
for (y in edgeY..._image.height - edgeY) {
var i = 0
for (fx in 0...windowWidth) {
for (fy in 0...windowHeight) {
window[i] = _image.pget(x + fx - edgeX, y + fy - edgeY)
i = i + 1
}
}
window.sort(comparer)
_image.pset(x, y, window[((windowWidth * windowHeight)/2).floor])
}
}
}
init() {
medianFilter(_ww, _wh)
// display it on the right after filtering
_image.draw(_image.width, 0)
// save it to a file
_image.saveToFile(_name)
}
update() {}
draw(alpha) {}
}
var Game = MedianFilter.new("Medianfilterp.png", "Medianfilterp2.png", 3, 3)</lang>
=={{header|zkl}}==
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