静态图像中的颜色检测-OpenCV Android [英] Color detection in a static image - OpenCV Android

问题描述

我有一个红色，绿色，蓝色和黄色四个正方形的图像.我需要获取每个正方形的rgb值.我可以获取整个图像的rgb，但我希望将其用于特定的部分.

I have an image with four squares red, green, blue and yellow. I need to get the rgb values of each squares. I'm able to get the rgb of the whole image, but i want it for a specific section.

• 我要获取的图像将来自相机并存储到SD卡上

推荐答案

我不知道我是否完全了解你，但是来了.

I don't know if I understand you exactly, but here it comes.

您需要创建BufferedImage对象以获得RGB值:

You need to create BufferedImage object to get RGB value:

File f = new File(yourFilePath);
BufferedImage img = ImageIO.read(f);

从那时起，您可以从图像中获取RGB颜色值.您有4个正方形；要检查其RGB值，可以检查角点像素的RGB值:

You can get RGB Color values from the image from then. You have 4 squares; to check their RGB values, you can check the corner pixels' RGB values:

Color leftTop = new Color(img.getRGB(0, 0));
Color rightTop = new Color(img.getRGB(img.getWidth - 1, 0));
Color leftBottom = new Color(img.getRGB(0, img.getHeight - 1));
Color rightBottom = new Color(img.getRGB(img.getWidth - 1, img.getHeight - 1));

此后，很容易分别获得红色，绿色和蓝色值:

After that it's easy to get red, green and blue values individually:

int red = leftTop.getRed();
int green = leftTop.getGreen();
int blue = leftTop.getBlue();

真的很抱歉，我没有看到它适用于Android.如您所说，Android没有ImageIO类.要在Android中完成任务，请首先初始化图片:

I'm really sorry, I didn't see it's for Android. As you said, Android doesn't have ImageIO class. To accomplish the task in Android, first initialize the image:

Bitmap img = BitmapFactory.decodeFile(yourFilePath);

从那时起，操作几乎是相同的:

From then the operation is pretty much the same:

int leftTop = img.getPixel(0, 0);
...

int red = Color.red(pixel);
int blue = Color.blue(pixel);
int green = Color.green(pixel);

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