docs/api_EN.md

API Documentation

TOC

• Before You Start: Launch the Backend Service
• Interface Function Descriptions
• cURL Request Example
• Python Request Example
  • Python Requests Method
  • Python Script Method
• Java Request Example
• Javascript Request Example

Before You Start: Launch the Backend Service

Before making API requests, please run the backend service:

python deploy_api.py

Interface Function Descriptions

1. Generate ID Photo (Transparent Background)

Interface Name: idphoto

The Generate ID Photo interface logic involves sending an RGB image and receiving a standard ID photo and a high-definition ID photo:

• High-Definition ID Photo: An ID photo made according to the aspect ratio of size, with the filename being output_image_dir appended with _hd suffix.
• Standard ID Photo: A photo with dimensions equal to size, scaled from the high-definition ID photo, with the filename being output_image_dir.

It should be noted that both generated photos are transparent (RGBA four-channel images). To produce a complete ID photo, the following Add Background Color interface is also required.

Q: Why is this design used?
A: In actual products, users often need to frequently switch background colors to preview effects. Providing a transparent background image and allowing the front-end JavaScript code to synthesize the color offers a better user experience.

2. Add Background Color

Interface Name: add_background

The Add Background Color interface logic involves sending an RGBA image, adding a background color based on color, and synthesizing a JPG image.

3. Generate 6-inch Layout Photo

Interface Name: generate_layout_photos

The Generate 6-inch Layout Photo interface logic involves sending an RGB image (usually an ID photo after adding a background color), arranging the photos according to size, and then generating a 6-inch layout photo.

cURL Request Examples

cURL is a command-line tool used to transfer data using various network protocols. Below are examples of how to use cURL to call these APIs.

1. Generate ID Photo (Transparent Background)

curl -X POST "http://127.0.0.1:8080/idphoto" \
-F "input_image=@demo/images/test.jpg" \
-F "height=413" \
-F "width=295"

2. Add Background Color

curl -X POST "http://127.0.0.1:8080/add_background" \
-F "input_image=@test.png" \
-F "color=638cce" \
-F "kb=200"

3. Generate Six-Inch Layout Photo

curl -X POST "http://127.0.0.1:8080/generate_layout_photos" \
-F "input_image=@test.jpg" \
-F "height=413" \
-F "width=295" \
-F "kb=200"

Python Request Example

1️⃣ Python Requests Method

1. Generate ID Photo (Transparent Background)

import requests

url = "http://127.0.0.1:8080/idphoto"
input_image_path = "images/test.jpg"

files = {"input_image": open(input_image_path, "rb")}
data = {"height": 413, "width": 295}

response = requests.post(url, files=files, data=data).json()

# response is a JSON dictionary containing status, image_base64_standard, and image_base64_hd
print(response)

2. Add Background Color

import requests

url = "http://127.0.0.1:8080/add_background"
input_image_path = "test.png"

files = {"input_image": open(input_image_path, "rb")}
data = {"color": '638cce', 'kb': None}

response = requests.post(url, files=files, data=data).json()

# response is a JSON dictionary containing status and image_base64
print(response)

3. Generate 6-inch Layout Photo

import requests

url = "http://127.0.0.1:8080/generate_layout_photos"
input_image_path = "test.jpg"

files = {"input_image": open(input_image_path, "rb")}
data = {"height": 413, "width": 295, "kb": 200}

response = requests.post(url, files=files, data=data).json()

# response is a JSON dictionary containing status and image_base64
print(response)

2️⃣ Python Script Request Method

python requests_api.py -u <URL> -t <TYPE> -i <INPUT_IMAGE_DIR> -o <OUTPUT_IMAGE_DIR> [--height <HEIGHT>] [--width <WIDTH>] [-c <COLOR>] [-k <KB>]

Parameter Descriptions

Basic Parameters

• -u, --url

  • Description: The URL of the API service.
  • Default Value: http://127.0.0.1:8080

• -t, --type

  • Description: The type of API request, with optional values being idphoto, add_background, and generate_layout_photos. They represent ID photo creation, transparent image background addition, and layout photo generation, respectively.
  • Default Value: idphoto

• -i, --input_image_dir

  • Description: The path of the input image.
  • Required: Yes
  • Example: ./input_images/photo.jpg

• -o, --output_image_dir

  • Description: The path to save the image.
  • Required: Yes
  • Example: ./output_images/processed_photo.jpg

Optional Parameters

• --height

  • Description: The height of the output size for the standard ID photo.
  • Default Value: 413

• --width

  • Description: The width of the output size for the standard ID photo.
  • Default Value: 295

• -c, --color

  • Description: Adds a background color to the transparent image, in Hex format (e.g., #638cce), only effective when the type is add_background.
  • Default Value: 638cce

• -k, --kb

  • Description: The KB value of the output photo, only effective when the type is add_background or generate_layout_photos, and no setting is made when the value is None.
  • Default Value: None
  • Example: 50

1. Generate ID Photo (Transparent Background)

python requests_api.py  \
    -u http://127.0.0.1:8080 \
    -t idphoto \
    -i ./photo.jpg \
    -o ./idphoto.png \
    --height 413 \
    --width 295

2. Add Background Color

python requests_api.py  \
    -u http://127.0.0.1:8080  \
    -t add_background  \
    -i ./idphoto.png  \
    -o ./idphoto_with_background.jpg  \
    -c 638cce  \
    -k 50

3. Generate 6-inch Layout Photo

python requests_api.py  \
    -u http://127.0.0.1:8080  \
    -t generate_layout_photos  \
    -i ./idphoto_with_background.jpg  \
    -o ./layout_photo.jpg  \
    --height 413  \
    --width 295 \
    -k 200

Request Failure Scenarios

• The request fails if more than one face is detected in the photo.

Java Request Example

Add Maven Dependency

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.16</version>
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>

Running the Code

1. Generate ID Photo (Transparent Background)

    /**
     * Generate ID Photo (Transparent Background) /idphoto interface
     * @param inputImageDir File address
     * @return
     * @throws IOException
     */
    public static String requestIdPhoto(String inputImageDir) throws IOException {
        String url = BASE_URL+"/idphoto";
        // Create file object
        File inputFile = new File(inputImageDir);
        Map<String, Object> paramMap=new HashMap<>();
        paramMap.put("input_image",inputFile);
        paramMap.put("height","413");
        paramMap.put("width","295");
        // Contains status, image_base64_standard, and image_base64_hd
        return HttpUtil.post(url, paramMap);
    }

2. Add Background Color

    /**
     * Add Background Color /add_background interface
     * @param inputImageDir File address
     * @return
     * @throws IOException
     */
    public static String requestAddBackground(String inputImageDir) throws IOException {
        String url = BASE_URL+"/add_background";
        // Create file object
        File inputFile = new File(inputImageDir);
        Map<String, Object> paramMap=new HashMap<>();
        paramMap.put("input_image",inputFile);
        paramMap.put("color","638cce");
        paramMap.put("kb","200");
        // Response is a JSON dictionary containing status and image_base64
        return HttpUtil.post(url, paramMap);
    }

3. Generate 6-inch Layout Photo

    /**
     * Generate 6-inch Layout Photo /generate_layout_photos interface
     * @param inputImageDir File address
     * @return
     * @throws IOException
     */
    public static String requestGenerateLayoutPhotos(String inputImageDir) throws IOException {
        String url = BASE_URL+"/generate_layout_photos";
        // Create file object
        File inputFile = new File(inputImageDir);
        Map<String, Object> paramMap=new HashMap<>();
        paramMap.put("input_image",inputFile);
        paramMap.put("height","413");
        paramMap.put("width","295");
        paramMap.put("kb","200");
        // Response is a JSON dictionary containing status and image_base64
        return HttpUtil.post(url, paramMap);
    }

4. Summary

import cn.hutool.http.HttpUtil;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import org.apache.commons.io.FileUtils;
import org.springframework.util.StringUtils;
import java.io.File;
import java.io.IOException;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;

/**
 * @author: qingshuang
 * @createDate: 2024/09/05
 * @description: Java generate ID photo, test case
 */
public class Test {
    /**
     * Interface address
     */
    private final static String BASE_URL = "http://127.0.0.1:8080";

    /**
     * Generate ID Photo (Transparent Background) /idphoto interface
     * @param inputImageDir File address
     * @return
     * @throws IOException
     */
    public static String requestIdPhoto(String inputImageDir) throws IOException {
        String url = BASE_URL+"/idphoto";
        // Create file object
        File inputFile = new File(inputImageDir);
        Map<String, Object> paramMap=new HashMap<>();
        paramMap.put("input_image",inputFile);
        paramMap.put("height","413");
        paramMap.put("width","295");
        return HttpUtil.post(url, paramMap);
    }
    /**
     * Add Background Color /add_background interface
     * @param inputImageDir File address
     * @return
     * @throws IOException
     */
    public static String requestAddBackground(String inputImageDir) throws IOException {
        String url = BASE_URL+"/add_background";
        // Create file object
        File inputFile = new File(inputImageDir);
        Map<String, Object> paramMap=new HashMap<>();
        paramMap.put("input_image",inputFile);
        paramMap.put("color","638cce");
        paramMap.put("kb","200");
        return HttpUtil.post(url, paramMap);
    }
    /**
     * Generate 6-inch Layout Photo /generate_layout_photos interface
     * @param inputImageDir File address
     * @return
     * @throws IOException
     */
    public static String requestGenerateLayoutPhotos(String inputImageDir) throws IOException {
        String url = BASE_URL+"/generate_layout_photos";
        // Create file object
        File inputFile = new File(inputImageDir);
        Map<String, Object> paramMap=new HashMap<>();
        paramMap.put("input_image",inputFile);
        paramMap.put("height","413");
        paramMap.put("width","295");
        paramMap.put("kb","200");
        return HttpUtil.post(url, paramMap);
    }
    /**
     * Generate ID Photo (Transparent Background)
     * @param inputImageDir Source file address
     * @param outputImageDir Output file address
     * @throws IOException
     */
    private static void requestIdPhotoToImage(String inputImageDir, String outputImageDir) throws IOException {
        String res =requestIdPhoto(inputImageDir);
        // Convert to JSON
        JSONObject response= JSONUtil.parseObj(res);
        if(response.getBool("status")){// Request interface success
            String  image_base64_standard= response.getStr("image_base64_standard");
            String  image_base64_hd =response.getStr("image_base64_hd");
            String[] outputImageDirArr= StringUtils.split(outputImageDir,".");
            // Base64 save as image
            FileUtils.writeByteArrayToFile(new File(outputImageDirArr[0]+"_standard."+outputImageDirArr[1]),  Base64.getDecoder().decode(image_base64_standard));
            FileUtils.writeByteArrayToFile(new File(outputImageDirArr[0]+"_hd."+outputImageDirArr[1]),  Base64.getDecoder().decode(image_base64_hd));
        }
    }
    /**
     * Add Background Color
     * @param inputImageDir Source file address
     * @param outputImageDir Output file address
     * @throws IOException
     */
    private static void requestAddBackgroundToImage(String inputImageDir, String outputImageDir) throws IOException {
        String res =requestAddBackground(inputImageDir);
        // Convert to JSON
        JSONObject response= JSONUtil.parseObj(res);
        if(response.getBool("status")){// Request interface success
            String  image_base64= response.getStr("image_base64");
            String[] outputImageDirArr= StringUtils.split(outputImageDir,".");
            // Base64 save as image
            FileUtils.writeByteArrayToFile(new File(outputImageDirArr[0]+"_background."+outputImageDirArr[1]),  Base64.getDecoder().decode(image_base64));
        }
    }
    /**
     * Generate 6-inch Layout Photo
     * @param inputImageDir Source file address
     * @param outputImageDir Output file address
     * @throws IOException
     */
    private static void requestGenerateLayoutPhotosToImage(String inputImageDir, String outputImageDir) throws IOException {
        String res =requestGenerateLayoutPhotos(inputImageDir);
        // Convert to JSON
        JSONObject response= JSONUtil.parseObj(res);
        if(response.getBool("status")){// Request interface success
            String  image_base64= response.getStr("image_base64");
            String[] outputImageDirArr= StringUtils.split(outputImageDir,".");
            // Base64 save as image
            FileUtils.writeByteArrayToFile(new File(outputImageDirArr[0]+"_layout."+outputImageDirArr[1]),  Base64.getDecoder().decode(image_base64));
        }
    }

    public static void main(String[] args) {
        try {
            // Generate ID Photo (Transparent Background)
            requestIdPhotoToImage("C:\\Users\\Administrator\\Desktop\\1111.jpg","C:\\Users\\Administrator\\Desktop\\2222.png");
            // Add Background Color
            requestAddBackgroundToImage("C:\\Users\\Administrator\\Desktop\\2222_hd.png","C:\\Users\\Administrator\\Desktop\\idphoto_with_background.jpg");
            // Generate 6-inch Layout Photo
            requestGenerateLayoutPhotosToImage("C:\\Users\\Administrator\\Desktop\\1111.jpg","C:\\Users\\Administrator\\Desktop\\2222.png");

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

JavaScript Request Examples

In JavaScript, we can use the fetch API to send HTTP requests. Below are examples of how to call these APIs using JavaScript.

1. Generate ID Photo (Transparent Background)

async function generateIdPhoto(inputImagePath, height, width) {
    const url = "http://127.0.0.1:8080/idphoto";
    const formData = new FormData();
    formData.append("input_image", new File([await fetch(inputImagePath).then(res => res.blob())], "test.jpg"));
    formData.append("height", height);
    formData.append("width", width);

    const response = await fetch(url, {
        method: 'POST',
        body: formData
    });

    const result = await response.json();
    console.log(result);
    return result;
}

// Example call
generateIdPhoto("images/test.jpg", 413, 295).then(response => {
    console.log(response);
});

2. Add Background Color

async function addBackground(inputImagePath, color, kb) {
    const url = "http://127.0.0.1:8080/add_background";
    const formData = new FormData();
    formData.append("input_image", new File([await fetch(inputImagePath).then(res => res.blob())], "test.png"));
    formData.append("color", color);
    formData.append("kb", kb);

    const response = await fetch(url, {
        method: 'POST',
        body: formData
    });

    const result = await response.json();
    console.log(result);
    return result;
}

// Example call
addBackground("test.png", "638cce", 200).then(response => {
    console.log(response);
});

3. Generate Six-Inch Layout Photo

async function generateLayoutPhotos(inputImagePath, height, width, kb) {
    const url = "http://127.0.0.1:8080/generate_layout_photos";
    const formData = new FormData();
    formData.append("input_image", new File([await fetch(inputImagePath).then(res => res.blob())], "test.jpg"));
    formData.append("height", height);
    formData.append("width", width);
    formData.append("kb", kb);

    const response = await fetch(url, {
        method: 'POST',
        body: formData
    });

    const result = await response.json();
    console.log(result);
    return result;
}

// Example call
generateLayoutPhotos("test.jpg", 413, 295, 200).then(response => {
    console.log(response);
});