Vue and Canvas: How to implement image beautification and skin resurfacing functions

Vue and Canvas: How to implement the beautification and dermabrasion functions of pictures

In recent years, the beautification and dermabrasion functions have become standard functions of many mobile phone camera applications. These functions not only make users more confident when taking selfie photos, but also improve the quality of the pictures to a certain extent. This article will introduce how to use Vue and Canvas technology to realize the beautification and skin resurfacing functions of pictures.

1. Understand Vue and Canvas

Briefly introduce Vue and Canvas. Vue is a progressive framework for building user interfaces that renders data into DOM views and updates the view in real time when the data changes. Canvas is a newly added drawing tag in HTML5, which can be used to draw graphics, animations, etc.

2. Preparation work

Before starting the implementation, we need to prepare some basic work.

1. Create a Vue project and introduce the Canvas component:

Enter the following command on the command line to create a Vue project:

vue create beautify-app

Then, in src/components Create a component named Canvas.vue in the directory, which means that we will implement the functions of Canvas in this component.

2. Add image upload function:

Add an input tag in Canvas.vue to receive image files uploaded by users.

<template>
  <div>
    <input type="file" @change="handleImageUpload" />
  </div>
</template>

3. Implement the beautification function

Next, we will implement the beautification function of the picture. First, we need to introduce a filter image for beauty in Canvas.vue.

1. Add filter picture:

Add a picture named beauty.png in the assets directory, which is used as a beauty filter.

2. Draw pictures:

In the mounted hook function, we draw the uploaded picture on the canvas.

mounted() {
  this.canvas = this.$refs.canvas;
  this.context = this.canvas.getContext('2d');
  const image = new Image();
  image.src = this.imageUrl;
  image.onload = () => {
    this.context.drawImage(image, 0, 0, this.canvas.width, this.canvas.height);
  };
},

3. Apply filters:

After drawing the picture, we use the getImageData method and putImageData method of Canvas to Image filters are applied to uploaded images.

applyFilter() {
  const filterImage = new Image();
  filterImage.src = '@/assets/beautify.png';
  filterImage.onload = () => {
    const imageData = this.context.getImageData(0, 0, this.canvas.width, this.canvas.height);
    const filterContext = this.createFilterContext(filterImage, imageData);
    this.context.putImageData(filterContext, 0, 0);
  };
},

Among them, the createFilterContext method is used to create the context of the filter effect and return it.

4. Realize the dermabrasion function

Next, we will realize the dermabrasion function. The realization of the skin resurfacing function mainly relies on the pixel processing method of Canvas.

1. Get pixel data:

We can use the getImageData method of Canvas to get the pixel data of the image.

const imageData = this.context.getImageData(0, 0, this.canvas.width, this.canvas.height);
const data = imageData.data;

2. Processing pixel data:

We can process each pixel by traversing the pixel data. Here we can blur the pixels using the Gaussian blur algorithm.

for (let i = 0, len = data.length; i < len; i += 4) {
  const red = data[i];
  const green = data[i + 1];
  const blue = data[i + 2];
  const alpha = data[i + 3];
  
  // 磨皮处理
  // ...
}

3. Drawing pixel data:

Finally, we use the putImageData method to draw the processed pixel data onto the Canvas.

const resultImageData = new ImageData(data, imageData.width, imageData.height);
this.context.putImageData(resultImageData, 0, 0);

5. Improve the function

After completing the above steps, we can realize the beautification and skin resurfacing functions of the picture by calling methods.

1. Upload pictures:

In the handleImageUpload method, we use the URL.createObjectURL method to generate a pointer to the user to upload the picture URL.

handleImageUpload(event) {
  const file = event.target.files[0];
  this.imageUrl = URL.createObjectURL(file);
},

2. Apply filters and smoothing:

In the click event of the button, we call the applyFilter method and applySmoothing# respectively. ##Methods to apply filters and dermabrasion.

<button @click="applyFilter">应用滤镜</button>
<button @click="applySmoothing">应用磨皮</button>

6. Summary

Through the combination of Vue and Canvas, we can easily realize the beautification and skin resurfacing functions of pictures. By processing Canvas pixels, we can develop different beautification algorithms according to needs to provide a better user experience.

The following is a complete Canvas.vue code example:

<template>
  <div>
    <input type="file" @change="handleImageUpload" />
    <button @click="applyFilter">应用滤镜</button>
    <button @click="applySmoothing">应用磨皮</button>

    <canvas ref="canvas" :width="canvasWidth" :height="canvasHeight"></canvas>
  </div>
</template>

<script>
export default {
  data() {
    return {
      imageUrl: '',
      canvas: null,
      context: null,
      canvasWidth: 400,
      canvasHeight: 300,
    };
  },
  mounted() {
    this.canvas = this.$refs.canvas;
    this.context = this.canvas.getContext('2d');
  },
  methods: {
    handleImageUpload(event) {
      const file = event.target.files[0];
      this.imageUrl = URL.createObjectURL(file);
      const image = new Image();
      image.src = this.imageUrl;
      image.onload = () => {
        this.context.drawImage(image, 0, 0, this.canvas.width, this.canvas.height);
      };
    },
    applyFilter() {
      const filterImage = new Image();
      filterImage.src = '@/assets/beautify.png';
      filterImage.onload = () => {
        const imageData = this.context.getImageData(0, 0, this.canvas.width, this.canvas.height);
        const filterContext = this.createFilterContext(filterImage, imageData);
        this.context.putImageData(filterContext, 0, 0);
      };
    },
    applySmoothing() {
      const imageData = this.context.getImageData(0, 0, this.canvas.width, this.canvas.height);
      const data = imageData.data;
      for (let i = 0, len = data.length; i < len; i += 4) {
        const red = data[i];
        const green = data[i + 1];
        const blue = data[i + 2];
        const alpha = data[i + 3];

        // 磨皮处理
        // ...

      }

      const resultImageData = new ImageData(data, imageData.width, imageData.height);
      this.context.putImageData(resultImageData, 0, 0);
    },
    createFilterContext(filterImage, imageData) {
      const filterCanvas = document.createElement('canvas');
      filterCanvas.width = this.canvas.width;
      filterCanvas.height = this.canvas.height;
      const filterContext = filterCanvas.getContext('2d');

      const pattern = filterContext.createPattern(filterImage, 'repeat');
      filterContext.fillStyle = pattern;
      filterContext.fillRect(0, 0, filterCanvas.width, filterCanvas.height);

      const filterImageData = filterContext.getImageData(0, 0, filterCanvas.width, filterCanvas.height);
      const filterData = filterImageData.data;
      const data = imageData.data;

      for (let i = 0, len = data.length; i < len; i += 4) {
        data[i] = data[i] * filterData[i] / 255;
        data[i + 1] = data[i + 1] * filterData[i + 1] / 255;
        data[i + 2] = data[i + 2] * filterData[i + 2] / 255;
      }

      return imageData;
    },
  },
};
</script>

In this example, we achieve the beautification and beauty of the image by drawing the uploaded image, and applying filters and skinning. Microdermabrasion function. By flexibly using the APIs of Vue and Canvas, we can customize different beauty algorithms according to needs and provide a better user experience.

I hope this article can help you understand how to use Vue and Canvas to implement the beautification and skin-smoothing functions of pictures. Happy programming!

The above is the detailed content of Vue and Canvas: How to implement image beautification and skin resurfacing functions. For more information, please follow other related articles on the PHP Chinese website!