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找不到符號編譯器錯誤

[英]Cannot find symbol compiler error

我在為Java編程類要做的這項作業時遇到問題。 我要做的是對具有純背景的圖像執行色度鍵技術。 更多信息可以在這里找到。 當我為方法放置兩個對象參數時,創建的方法就可以使用。 但是,當我將參數放入構造函數中,然后嘗試使用該方法時,出現編譯器錯誤。 我的課程在下面(我必須使用兩個不同的類,一個用於方法,一個用於測試)。 任何幫助將不勝感激,我是java的新手,最簡單的方法是最好的。

public class ChromaKey
{
    public ChromaKey(Picture backgroundDelete, Picture backgroundImage)
    {  
    }
    public void chromaKey()
    {        
         int redValue = 0; int greenValue = 0; int blueValue = 0;      
        Color pixelColor = null;   
        Color pixelColor1 = null;   
        for(int y = 0; y < backgroundImage.getHeight(); y++)             
        {
            for(int x = 0; x < backgroundImage.getWidth(); x++)    
            {
                Pixel targetPixel = new Pixel(backgroundImage,x,y);   
                Pixel targetPixel1 = new Pixel(backgroundDelete,x,y);

                targetPixel = backgroundImage.getPixel(x,y);                
                pixelColor = targetPixel.getColor();

                targetPixel1 = backgroundDelete.getPixel(x,y);
                pixelColor1 = targetPixel1.getColor();

                int targetRed = pixelColor1.getRed();
                int targetBlue = pixelColor1.getGreen();
                int targetGreen = pixelColor1.getBlue();

                int backgroundRed = pixelColor.getRed();
                int backgroundGreen = pixelColor.getGreen();
                int backgroundBlue = pixelColor.getBlue();

                if(targetRed >= 200 && targetBlue >= 200 && targetGreen >= 200) 
                {
                    targetPixel1.setRed(backgroundRed);
                    targetPixel1.setGreen(backgroundGreen);
                    targetPixel1.setBlue(backgroundBlue);

                }
            }
        }
        backgroundImage.show();
        backgroundDelete.show();
    }
}

有些東西看起來好像不見了。 首先,您要導入Color和Pixel類,還是將它們與ChromaKey類包含在同一包中?

其次,您需要將backgroundImage和backgroundDelete定義為類變量,以便在您的void chromaKey()方法中調用它(注意,我添加的“ private Picture backgroundDelete;”行以及構造函數中的賦值):

公共類ChromaKey {

private Picture backgroundDelete;
private Picture backgroundImage;


public ChromaKey(Picture backgroundDelete, Picture backgroundImage)
{  
    this.backgroundDelete = backgroundDelete;
    this.backgroundImage = backgroundImage;
}
public void chromaKey()
{        
     int redValue = 0; int greenValue = 0; int blueValue = 0;      
    Color pixelColor = null;   
    Color pixelColor1 = null;   
    for(int y = 0; y < backgroundImage.getHeight(); y++)             
    {
        for(int x = 0; x < backgroundImage.getWidth(); x++)    
        {
            Pixel targetPixel = new Pixel(backgroundImage,x,y);   
            Pixel targetPixel1 = new Pixel(backgroundDelete,x,y);

            targetPixel = backgroundImage.getPixel(x,y);                
            pixelColor = targetPixel.getColor();

            targetPixel1 = backgroundDelete.getPixel(x,y);
            pixelColor1 = targetPixel1.getColor();

            int targetRed = pixelColor1.getRed();
            int targetBlue = pixelColor1.getGreen();
            int targetGreen = pixelColor1.getBlue();

            int backgroundRed = pixelColor.getRed();
            int backgroundGreen = pixelColor.getGreen();
            int backgroundBlue = pixelColor.getBlue();

            if(targetRed >= 200 && targetBlue >= 200 && targetGreen >= 200) 
            {
                targetPixel1.setRed(backgroundRed);
                targetPixel1.setGreen(backgroundGreen);
                targetPixel1.setBlue(backgroundBlue);

            }
        }
    }
    backgroundImage.show();
    backgroundDelete.show();
}

}

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