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imagine.go
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imagine.go
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package main
import (
"fmt"
"os"
"image"
"image/color"
"image/png"
_ "image/jpeg"
"log"
)
func main() {
if len(os.Args) != 2 {
fmt.Println("Please supply an image file to process.")
return
}
file, err := os.Open(os.Args[1])
if err != nil {
log.Fatal(err)
}
defer file.Close()
// Decode the image.
m, _, err := image.Decode(file)
if err != nil {
log.Fatal(err)
}
m = featurize(m)
// m = blend(m)
outfile, _ := os.Create("output.png")
defer outfile.Close()
err = png.Encode(outfile, m)
if err != nil {
log.Fatal(err)
}
fmt.Println("done")
}
// for some reason required to make anonymous
// functions able to call themselves
// type discoverer func(x int, y, int)
func featurize(orig image.Image) (image.Image) {
// deviation range
color_dev := uint16(20<<8)
feature_dev := 4
bounds := orig.Bounds()
fmt.Println(bounds)
// initialize the array of pixels traversed
ex := make([][]bool, bounds.Max.X+1)
for i := 0; i < bounds.Max.X+1; i++ {
ex[i] = make([]bool, bounds.Max.Y+1)
}
// array of features
// feature is an array of arrays [x,y]
var features [][][2]int
feature_i := 0
// recursively investigate all neighbors of supplied pixel
// and build feature arrays
// some shenanigans to make anonymous functions recurisively callable
var discover func(x int,y int)
discover = func(x int,y int) {
// add this pixel to the current feature
features[feature_i] = append(features[feature_i], [2]int{x,y})
// fmt.Println(x,y)
ex[x][y] = true
// grab the rgb for the supplied pixel
_r, _g, _b, _ := orig.At(x,y).RGBA()
for i := -1; i < 2; i++ {
for j := -1; j < 2; j++ {
xx, yy := x+i, y+j
// check if it's within our bounds and if it's been processed already
if xx < 0 || yy < 0 || xx > bounds.Max.X || yy > bounds.Max.Y || ex[xx][yy] == true {
continue
}
rt, gt, bt, _ := orig.At(xx,yy).RGBA()
// check the color range against our deviation spec
if uint16(rt-_r) > color_dev || uint16(gt-_g) > color_dev || uint16(bt-_b) > color_dev {
continue
}
discover(xx, yy)
}
}
}
// run through each pixel and build features
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
// skip if already processed
if ex[x][y] == true {
continue
}
// fmt.Println(x,y)
features = append(features, [][2]int{})
discover(x,y)
feature_i++
}
}
newm := image.NewRGBA(bounds)
c := new(color.RGBA)
c.A = 255
for f := 0; f < len(features); f++ {
// if the feature is large enough
// average all pixel colors in it
// and set all pixels to that color
if len(features[f]) > feature_dev {
var r, g, b, ct uint64
for p := 0; p < len(features[f]); p++ {
rt, gt, bt, _ := orig.At(features[f][p][0], features[f][p][1]).RGBA()
r += uint64(rt)
g += uint64(gt)
b += uint64(bt)
ct++
}
c.R = uint8((r/ct)>>8)
c.G = uint8((g/ct)>>8)
c.B = uint8((b/ct)>>8)
for p := 0; p < len(features[f]); p++ {
newm.Set(features[f][p][0], features[f][p][1], c)
}
} else {
// write the pixel out as-is
for p := 0; p < len(features[f]); p++ {
r, g, b, _ := orig.At(features[f][p][0], features[f][p][1]).RGBA()
c.R = uint8(r>>8)
c.G = uint8(g>>8)
c.B = uint8(b>>8)
newm.Set(features[f][p][0], features[f][p][1], c)
}
}
}
return newm
}
func blend(orig image.Image) (m image.Image) {
// deviation range
dev := uint16(50<<8)
c := new(color.RGBA)
c.A = 255
bounds := orig.Bounds()
// iterations
for i := 0; i < 10; i++ {
newm := image.NewRGBA(bounds)
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
var r, g, b, ct uint32
_r, _g, _b, _ := orig.At(x,y).RGBA()
for i :=-1; i < 2; i++ {
for j := -1; j < 2; j++ {
rt, gt, bt, _ := orig.At(x+i,y+j).RGBA()
if uint16(rt-_r) > dev || uint16(gt-_g) > dev || uint16(bt-_b) > dev {
continue
}
r += rt
g += gt
b += bt
ct++
}
}
c.R = uint8((r/ct)>>8)
c.G = uint8((g/ct)>>8)
c.B = uint8((b/ct)>>8)
newm.Set(x,y, c)
}
}
m = newm
}
return
}