cvSetImageROI() and cvWarpAffine() made false color image about javacv HOT 15 CLOSED

Just try to

IplImage imageBGR = IplImage.create(imageWidth, imageHeight, IPL_DEPTH_8U, 3);
                    cvCvtColor(image,imageBGR,CV_YUV2BGR_NV21);

but video is greenish.

cvSetImageROI() won't work on planar images, that's normal. You'll need to 
convert that to RGB beforehand.

How do you create the `image` that you use in 
cvCvtColor(image,imageBGR,CV_YUV2BGR_NV21); ?

Thanks : ),

this way I'm create the 'image'

IplImage image = IplImage.create(imageWidth, imageHeight*3/2, IPL_DEPTH_8U, 2);

Just found this solution

http://stackoverflow.com/questions/12644627/android-javacv-create-iplimage-from-
camera-to-use-with-colorhistogram

It's worked!, but this is the best way?

Many thanks!

Thanks for pointing me back to my answer :) But it was not correct. I've edited 
to the following "best way", which should work, but again not tested:
    IplImage imageYUV = IplImage.create(imageWidth, imageHeight * 3 / 2, IPL_DEPTH_8U, 2);
    IplImage imageBGR = IplImage.create(imageWidth, imageHeight, IPL_DEPTH_8U, 3);
    cvCvtColor(imageYUV, imageBGR, CV_YUV2BGR_NV21);
Let me know if you have any problems with that, and please ask your questions 
on the mailing list next time if possible, thanks you!

Thanks!

but it's not work, just greenish like Attach file.

What code are you using?

[deleted comment]

decode yuv420sp to rgb before cropImage and rotateImage..
cvSetImageROI not clearly work on yuv format image..


...
public void onPreviewFrame(byte[] data, Camera camera) {
    ...
    int[] _temp = new int[imageWidth * imageHeight];
    decodeYUV420SP(_temp, data, imageWidth, imageHeight);
    IplImage image = IplImage.create(imageWidth, imageHeight, IPL_DEPTH_8U, 4);
    image.getIntBuffer().put(_temp);
    cvSetImageROI(image, new CvRect(...));
    ...
}

...
public static void decodeYUV420SP(int[] rgb, byte[] yuv420sp, int width, int 
height) {
    int frameSize = width * height;
    for (int j = 0, yp = 0; j < height; j++) {
        int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
        for (int i = 0; i < width; i++, yp++) {
            int y = (0xff & ((int) yuv420sp[yp])) - 16;
            if (y < 0) y = 0;
            if ((i & 1) == 0) {
                v = (0xff & yuv420sp[uvp++]) - 128;
                u = (0xff & yuv420sp[uvp++]) - 128;
            }
            int y1192 = 1192 * y;
                int r = (y1192 + 1634 * v);
            int g = (y1192 - 833 * v - 400 * u);
            int b = (y1192 + 2066 * u);
            if (r < 0) r = 0; else if (r > 262143) r = 262143;
            if (g < 0) g = 0; else if (g > 262143) g = 262143;
            if (b < 0) b = 0; else if (b > 262143) b = 262143;
            rgb[yp] = 0xff000000 | ((b << 6) & 0xff0000) | ((g >> 2) & 0xff00) | ((r >> 10) & 0xff);
        }
    }
}

No it doesn't unfortunately... We need to convert it to RGB first.

Is that solved?

Converting it to RGB didn't solve the problem, still green pictures. I'm 
looking for a solution.

@omur Can you provide the few lines of code you are using? Thanks

hi , 

how did you find the solution for same, 
Can you give me some hint

Thanks

Guys, if you are having a problem with a piece code, we cannot solve the 
problem if you do not provide the piece of code in question! Please copy/paste 
the piece of code you are executing and that isn't working as it should, thank 
you.