当前位置：文江博客话题详情

java中的图像裁剪

发布于 2024-09-06 20:14:58 字数 117 浏览 7 评论 0原文

我想在java中剪切图像的特定形状，例如包含白色背景的男人的图像，这里我想裁剪没有背景的男人。不想将其设为透明图像，想用一些坐标进行剪切。我认为使用cropImageFilter我们只能剪切矩形区域。谁能告诉我该怎么做？

原文

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

巴黎盛开的樱花 2024-09-13 20:14:58

首先，您需要从 java.awt.Image 创建 java.awt.image.BufferedImage。以下是来自 DZone Snippets 的一些代码。

/**
 * @author Anthony Eden
 */
public class BufferedImageBuilder {

    private static final int DEFAULT_IMAGE_TYPE = BufferedImage.TYPE_INT_RGB;

    public BufferedImage bufferImage(Image image) {
        return bufferImage(image, DEFAULT_IMAGE_TYPE);
    }

    public BufferedImage bufferImage(Image image, int type) {
        BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        Graphics2D g = bufferedImage.createGraphics();
        g.drawImage(image, null, null);
        waitForImage(bufferedImage);
        return bufferedImage;
    }

    private void waitForImage(BufferedImage bufferedImage) {
        final ImageLoadStatus imageLoadStatus = new ImageLoadStatus();
        bufferedImage.getHeight(new ImageObserver() {
            public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
                if (infoflags == ALLBITS) {
                    imageLoadStatus.heightDone = true;
                    return true;
                }
                return false;
            }
        });
        bufferedImage.getWidth(new ImageObserver() {
            public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
                if (infoflags == ALLBITS) {
                    imageLoadStatus.widthDone = true;
                    return true;
                }
                return false;
            }
        });
        while (!imageLoadStatus.widthDone && !imageLoadStatus.heightDone) {
            try {
                Thread.sleep(300);
            } catch (InterruptedException e) {

            }
        }
    }

    class ImageLoadStatus {

        public boolean widthDone = false;
        public boolean heightDone = false;
    }

}

现在您有了 BufferedImage，您可以使用该多边形坐标，您必须将不是人的像素变成透明。只需使用 BufferedImage 中提供的方法即可。

您无法从字面上从 BufferedImage 中剪切出多边形。 BufferedImage 必须是矩形。您能做的最好的事情就是使图像中不需要的部分变得透明。或者，您可以将所需的像素放在另一个矩形 BufferedImage 上。

First, you need to create a java.awt.image.BufferedImage from a java.awt.Image. Here's some code to do that, from DZone Snippets.

/**
 * @author Anthony Eden
 */
public class BufferedImageBuilder {

    private static final int DEFAULT_IMAGE_TYPE = BufferedImage.TYPE_INT_RGB;

    public BufferedImage bufferImage(Image image) {
        return bufferImage(image, DEFAULT_IMAGE_TYPE);
    }

    public BufferedImage bufferImage(Image image, int type) {
        BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        Graphics2D g = bufferedImage.createGraphics();
        g.drawImage(image, null, null);
        waitForImage(bufferedImage);
        return bufferedImage;
    }

    private void waitForImage(BufferedImage bufferedImage) {
        final ImageLoadStatus imageLoadStatus = new ImageLoadStatus();
        bufferedImage.getHeight(new ImageObserver() {
            public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
                if (infoflags == ALLBITS) {
                    imageLoadStatus.heightDone = true;
                    return true;
                }
                return false;
            }
        });
        bufferedImage.getWidth(new ImageObserver() {
            public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
                if (infoflags == ALLBITS) {
                    imageLoadStatus.widthDone = true;
                    return true;
                }
                return false;
            }
        });
        while (!imageLoadStatus.widthDone && !imageLoadStatus.heightDone) {
            try {
                Thread.sleep(300);
            } catch (InterruptedException e) {

            }
        }
    }

    class ImageLoadStatus {

        public boolean widthDone = false;
        public boolean heightDone = false;
    }

}

Now that you have a BufferedImage, you can use that polygon of coordinates you have to turn the pixels that are not the man, transparent. Just use the methods provided in BufferedImage.

You can't literally cut a polygon from a BufferedImage. A BufferedImage has to be a rectangle. The best you can do is make the parts of the image you don't want transparent. Or, you can put the pixels you do want on another rectangular BufferedImage.

回复收藏 0 原文