Golang vertical axis image flip

In golang, image processing is a very common requirement. In some scenarios, it is necessary to perform some transformations on the original image to achieve specific goals. Among them, image flipping is also a very common transformation, which can perform a certain rotation on the image to obtain a better display effect. In this article, we will discuss how to implement vertical axis image flipping in golang.

The role of vertical axis flipping

Before introducing how to achieve vertical axis image flipping, let’s first understand the role of vertical axis flipping. Vertical axis flipping is an operation that flips the image in the vertical axis direction. Through this operation, the design goals can be achieved, such as:

1. Vertical axis flipping can make the image more beautiful, thus improving the visual quality. Effect;

2. Vertical axis flipping can make the image display more realistic and better meet the needs;

3. Vertical axis flipping can change the direction of image display to adapt to different scenes ;

4. Vertical axis flipping can make the image clearer and facilitate subsequent processing.

Basic Principles

Before understanding how to implement vertical axis image flipping, let’s first understand the basic principles. Vertical axis image flipping is an operation of flipping the image in the vertical axis direction. The specific implementation method is to symmetrically exchange the pixels of each row of the image along the vertical axis.

In golang, image reading and processing can be achieved through the Image type in the image library. For the implementation of vertical axis image flipping, we need to implement the method based on the Image type. Below, we use an example to understand the specific implementation method.

Code implementation

The following is a sample code to implement vertical axis image flipping in golang. The Image library is used in this code to read and process images by calling methods in the library.

package main
 
import (
    "image"
    "image/png"
    "log"
    "os"
)
 
func main() {
 
    // 打开图像文件
    file, err := os.Open("test.png")
    if err != nil {
        log.Fatal(err)
    }
 
    // 解码图像文件
    img, err := png.Decode(file)
    if err != nil {
        log.Fatal(err)
    }
 
    // 获取图像矩形信息
    bounds := img.Bounds()

    // 生成一个新的图像矩形
    newImg := image.NewRGBA(bounds)
 
    // 遍历每一行像素并进行翻转
    for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
        for x := bounds.Min.X; x < bounds.Max.X; x++ {
            //获取对应的新像素
            newPixel := img.At(x, (bounds.Max.Y-1)-y)
            //设置新像素到新图像中
            newImg.Set(x, y, newPixel)
        }
    }
 
    // 创建并打开一个新文件
    newFile, err := os.Create("newtest.png")
    if err != nil {
        log.Fatal(err)
    }
    defer newFile.Close()
 
    // 将图像数据写入文件中
    png.Encode(newFile, newImg)
} 

In the above code, we first open an image file in png format, then decode the image file and obtain its rectangular information, create a new image rectangle, traverse each pixel of the original image, and follow the vertical The axis is flipped, and each new pixel is written to a new image, and finally the new image is written to a new file.

Summary

In this article, we introduced the basic principles and implementation methods of vertical axis image flipping, and provided sample code for image files in png format through the Image library in golang. Realize vertical axis image flipping. By mastering the content in this article, we can quickly implement basic operations such as image flipping in actual projects, thereby completing design requirements more efficiently.

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