Golang Image Processing: Learn how to achieve Gaussian blur effect on images

Golang Image Processing: Learn how to achieve the Gaussian blur effect of pictures

Introduction:
Image processing plays an important role in the field of computer vision. In image processing, Gaussian blur is a commonly used technique to blur images to reduce noise and detail in the image. In this article, we will learn how to use Golang to achieve the Gaussian blur effect of images, with code examples.

1. Environment preparation:
   First, make sure that the Golang development environment has been installed correctly. Verify that the installation is successful by entering the following command in the terminal or command prompt:

go version

If the version information of Golang is displayed, the installation is successful.

2. Import dependency packages:
   In order to achieve the Gaussian blur effect of images, we need to import golang.org/x/image/draw and github.com/ anthonynsimon/bild/blur These two dependency packages. These two packages can be downloaded and imported through the following commands:

go get golang.org/x/image/draw
go get github.com/anthonynsimon/bild/blur

3. Implementing the Gaussian blur function:
   Next, we will write a Gaussian blur function that will receive a A picture and blur radius are taken as parameters and the blurred picture is returned. The code is as follows:

package main

import (
    "fmt"
    "image"
    "image/jpeg"
    "os"

    "github.com/anthonynsimon/bild/blur"
    "golang.org/x/image/draw"
)

func gaussianBlur(img image.Image, radius float64) image.Image {
    bounds := img.Bounds()
    blurImg := image.NewRGBA(bounds)
    draw.Draw(blurImg, bounds, img, image.Point{}, draw.Src)
    blur.Gaussian(blurImg, radius)
    return blurImg
}

func main() {
    filePath := "input.jpg"
    outputPath := "output.jpg"

    // 打开图片文件
    file, err := os.Open(filePath)
    if err != nil {
        fmt.Println("无法打开图片文件:", err)
        return
    }
    defer file.Close()

    img, err := jpeg.Decode(file)
    if err != nil {
        fmt.Println("无法解码图片:", err)
        return
    }

    // 进行高斯模糊处理
    blurImg := gaussianBlur(img, 10.0)

    // 创建输出文件
    outputFile, err := os.Create(outputPath)
    if err != nil {
        fmt.Println("无法创建输出文件:", err)
        return
    }
    defer outputFile.Close()

    // 将模糊后的图片保存到输出文件
    jpeg.Encode(outputFile, blurImg, nil)

    fmt.Println("高斯模糊完成，输出文件为", outputPath)
}

In the above code, we first define a function named gaussianBlur, which receives an image and blur radius as parameters, and uses blur.Gaussian method performs Gaussian blur processing. Then, we opened an image file in the main function and blurred the image by calling the gaussianBlur function. Finally, we save the blurred image to the output file.

4. Run the program:
   Name the image to be processed input.jpg, and then execute the following command in the terminal or command prompt to run the program:

go run main.go

Gaussian blur processing will be applied to the image to be processed with a blur radius of 10.0, and the processed image will be saved as output.jpg. You can view the processed image effect by opening output.jpg.

Conclusion:
This article introduces how to use Golang to achieve the Gaussian blur effect of images. By using the blur.Gaussian method in the github.com/anthonynsimon/bild/blur package, we can easily perform Gaussian blur processing on the image. I hope this article can help you learn image processing.

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