在屏幕截图中模糊Rect [英] Blurring a Rect within a screenshot

问题描述

我正在开发一个Android应用，该应用使用背景Service来以编程方式捕获当前屏幕上所有内容的屏幕截图.我以Bitmap的形式获得了屏幕截图.

I'm developing an Android app which uses a background Service to programmatically capture a screenshot of whatever is on the screen currently. I obtain the screenshot as a Bitmap.

接下来，我成功导入了 OpenCV 进入我的Android项目.

Next, I successfully imported OpenCV into my Android project.

我现在需要做的是对该图像的子集进行模糊处理，即不是对整个图像本身进行模糊处理，而是对图像中的[矩形]区域或子区域进行模糊处理.我有一个 Rect 对象的数组，它们代表我需要的矩形区域截图中模糊不清.

What I need to do now is blur a subset of this image, i.e. not the entire image itself, but a [rectangular] area or sub-region within the image. I have an array of Rect objects representing the rectangular regions that I need to blur within the screenshot.

我一直在寻找有关使用Java中的OpenCV进行此操作的教程，但没有找到明确的答案. Mat 和 Imgproc 类显然是您感兴趣的类， Mat.submat() 方法，但是我无法找到有关完成此操作的清晰直接的教程.

I've been looking around for a tutorial on doing this with OpenCV in Java, and I haven't found a clear answer. The Mat and Imgproc classes are obviously the ones of interest, and there's the Mat.submat() method, but I've been unable to find a clear, straightforward tutorial on getting this done.

我在Google上搜索了很多，但没有找到完整的示例.我需要在Java运行时中的Java中执行此操作.

I've googled a lot, and none of the examples I've found are complete. I need to do this in Java, within the Android runtime.

我需要的是:Bitmap >>> Mat >>> >>> Rect >>> Bitmap具有投资回报率 模糊.

What I need is: Bitmap >>> Mat >>> Imgproc>>> Rect >>> Bitmap with ROI blurred.

这里有经验丰富的OpenCV开发人员，您能向我指出正确的方向吗?这是我唯一要坚持的事情.

Any experienced OpenCV devs out here, can you point me in the right direction? This is the only thing I'm stuck at.

相关:

使用OpenCV进行高斯模糊处理:仅模糊图像的子区域吗?.

如何使用OpenCv模糊重新包装.

如何在Android中模糊图像的某些部分?.

推荐答案

下面通过注释和示例图像共享实现此任务的C ++代码:

The C++ code to achieve this task is shared below with comments and sample images:

// load an input image
Mat img = imread("C:\\elon_tusk.png");

img :

// extract subimage
Rect roi(113, 87, 100, 50);
Mat subimg = img(roi);

subimg :

// blur the subimage
Mat blurred_subimage;
GaussianBlur(subimg, blurred_subimage, Size(0, 0), 5, 5);

blurred_subimage :

// copy the blurred subimage back to the original image
blurred_subimage.copyTo(img(roi));

img :

相当于Android的版本:

Android equivalent:

Mat img = Imgcodecs.imread("elon_tusk.png");
Rect roi = new Rect(113, 87, 100, 50);
Mat subimage = img.submat(roi).clone();
Imgproc.GaussianBlur(subimg, subimg, new Size(0,0), 5, 5);
subimg.copyTo(img.submat(roi));

这篇关于在屏幕截图中模糊Rect的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！