如何在Android的OpenCV的执行图像RGB归？ [英] How to perform Image RGB Normalization in Android OpenCV?

问题描述

我想执行图像归一化，使用的OpenCV 2.4.8为Android。我的测试设备是三星S3。

我已经写了JNI函数如下图所示进行图像归。

我的图像正常化的定义如下：

  R'是255 * R /（R + G + B）
g'为255 *克/（R + G + B）
b为255 * B /（R + G + B）
 

现在我需要实现这一点。而我写一个函数来执行此。这似乎没有工作。我相信我的我的应用程序的其他部分（即它们是无bug）。只有这部分导致了问题。

我可能没有正确地写入此功能。请帮助。

我还附上我的结果的截图。如果你看一下这个图片，只是半部分看起来规范化（但它实际上不是标准化的，它只是看起来是这样）及另一半则不是。为了解决这个问题，我试图改变在for循环与COLS行，结果是一样的。

在code这也是presented。

期待一些帮助。 （仅供参考 - 我完全陌生的OpenCV）。感谢您的谅解。

 无效NormalizeRGB（JNIEnv的*，jobject，jlong​​ IMG）
{
    垫＆安培; IMGM = *（*垫）IMG;
    矢量＆lt;＆垫GT; RGB;
    INT COLS = imgM.cols;
    诠释行= imgM.rows;
    的for（int i = 0; I＆LT;行;我++）
    {
        对于（INT J = 0; J＆LT; COLS; J ++）
        {
            Vec3b bgrPixel = imgM.at＆所述; Vec3b＆GT;（I，J）;
            浮总= bgrPixel.val [0] + bgrPixel.val [1] + bgrPixel.val [2] + 0.00001;
            bgrPixel.val [0] =（UCHAR）255 * bgrPixel.val [0] /总;
            bgrPixel.val [1] =（UCHAR）255 * bgrPixel.val [1] /总;
            bgrPixel.val [2] =（UCHAR）255 * bgrPixel.val [2] /总;
            imgM.at＆所述; Vec3b＆GT;（I，J）= bgrPixel;
        }
    }
}
 

解决方案

我找到了解决我的问题。

我试图用这个功能来读取一个RGBA矩阵图像。一个RGBA矩阵图像类型Vec4的。

我想读它作为一个VEC3〜这曾经导致上述问题。

有了这个小小的改变，我能得到我预期的结果。

I am trying to perform image normalization, using OpenCV 2.4.8 for Android. My test device is a samsung S3.

I have written a JNI function as shown below to perform Image Normalization.

My definition of Image Normalization is as follows :

r' is 255* r/(r+g+b)
g' is 255* g/(r+g+b)
b' is 255* b/(r+g+b)

Now I need to implement this. And I have written a function to perform this. This doesnt seem to work. I am confident of my other portions of my App (i.e. they are bug free). Only this part causes a problem.

I may have not written this function properly. Pls help.

I have also attached a screenshot of my result. If you look at this image, only half portion looks normalized (but its actually not normalized, it just looks that way) & the other half is not. To fix this, I tried changing the rows with cols in the for-loop, and the result was the same.

The code for this is also presented.

Looking forward to some help. (FYI - I am totally new to openCV). Thanks for understanding.

void NormalizeRGB(JNIEnv*, jobject, jlong img)
{
    Mat& imgM  = *(Mat*)img;
    vector<Mat> rgb;
    int cols = imgM.cols;
    int rows = imgM.rows;
    for(int i = 0; i<rows; i++)
    {
        for(int j = 0; j<cols; j++)
        {
            Vec3b bgrPixel = imgM.at<Vec3b>(i, j);
            float total = bgrPixel.val[0] + bgrPixel.val[1] + bgrPixel.val[2] + 0.00001;
            bgrPixel.val[0] = (uchar) 255*bgrPixel.val[0]/total;
            bgrPixel.val[1] = (uchar) 255*bgrPixel.val[1]/total;
            bgrPixel.val[2] = (uchar) 255*bgrPixel.val[2]/total;
            imgM.at<Vec3b>(i, j) = bgrPixel;
        }
    }
}

解决方案

I found the solution to my problems.

I was trying to use this function to read an RGBA Matrix image. A RGBA Matrix image is of type Vec4.

I was trying to read it as a Vec3 ~ this used to cause the above problem.

With this small change, I was able to get my expected results.

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