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// Copyright 2020 Nick White.
// Use of this source code is governed by the GPLv3
// license that can be found in the LICENSE file.
package integralimg_test
import (
"fmt"
"image"
"image/draw"
_ "image/png"
"log"
"os"
"rescribe.xyz/integralimg"
)
func ExampleImage_Sum() {
f, err := os.Open("testdata/in.png")
if err != nil {
log.Fatal(err)
}
defer f.Close()
img, _, err := image.Decode(f)
if err != nil {
log.Fatal(err)
}
b := img.Bounds()
integral := integralimg.NewImage(b)
draw.Draw(integral, b, img, b.Min, draw.Src)
fmt.Printf("Sum: %d\n", integral.Sum(b))
// Output:
// Sum: 601340165
}
func ExampleImage_Mean() {
f, err := os.Open("testdata/in.png")
if err != nil {
log.Fatal(err)
}
defer f.Close()
img, _, err := image.Decode(f)
if err != nil {
log.Fatal(err)
}
b := img.Bounds()
integral := integralimg.NewImage(b)
draw.Draw(integral, b, img, b.Min, draw.Src)
fmt.Printf("Mean: %f\n", integral.Mean(b))
// Output:
// Mean: 54677.229042
}
func ExampleMeanStdDev() {
f, err := os.Open("testdata/in.png")
if err != nil {
log.Fatal(err)
}
defer f.Close()
img, _, err := image.Decode(f)
if err != nil {
log.Fatal(err)
}
b := img.Bounds()
integral := integralimg.NewImage(b)
sqIntegral := integralimg.NewSqImage(b)
draw.Draw(integral, b, img, b.Min, draw.Src)
draw.Draw(sqIntegral, b, img, b.Min, draw.Src)
mean, stddev := integralimg.MeanStdDev(*integral, *sqIntegral, b)
fmt.Printf("Mean: %f, Standard Deviation: %f\n", mean, stddev)
// Output:
// Mean: 54677.229042, Standard Deviation: 21643.721672
}
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