项目中需要合成图片,然网上各种方法不好使,于是在Opencv for unity插件论坛爬呀爬,熬夜找到了方法,还在困扰的猿们可以试试,代码中cvAdd4cMat_q()方法是关键。
注意Imgproc.cvtColor(bgmat, bgmat, Imgproc.COLOR_BGR2RGB);转换通道,因为Imgcodecs.imread()方法读取的Mat数据结构中存储为BGR排列。
老规矩,先看效果图:
1人像图,四周是全透明的
2背景图:
3合成图:
上代码:
void Start()
{
GetComponent<RawImage>().texture = MatMerg();
}
Texture2D MatMerg()
{
Mat bgmat = Imgcodecs.imread(Application.streamingAssetsPath + "/bg.png", Imgcodecs.CV_LOAD_IMAGE_UNCHANGED);
Mat qj = Imgcodecs.imread(Application.streamingAssetsPath + "/qj.png", Imgcodecs.CV_LOAD_IMAGE_UNCHANGED);
Imgproc.cvtColor(bgmat, bgmat, Imgproc.COLOR_BGR2RGB);
Imgproc.cvtColor(qj, qj, Imgproc.COLOR_BGRA2RGBA);
Mat bgmat_roi = new Mat(bgmat, new OpenCVForUnity.Rect(797, 269, qj.cols(), qj.rows()));
cvAdd4cMat_q(bgmat_roi, qj, 1.0);
Texture2D texture = new Texture2D(bgmat.cols(), bgmat.rows(), TextureFormat.RGBA32, false);
Utils.matToTexture2D(bgmat, texture);
return texture;
}
private bool cvAdd4cMat_q(Mat dst, Mat scr, double scale)
{
if (dst.channels() != 3 || scr.channels() != 4)
{
return true;
}
if (scale < 0.01)
return false;
List<Mat> scr_channels = new List<Mat>();
List<Mat> dstt_channels = new List<Mat>();
Core.split(scr, scr_channels);
Core.split(dst, dstt_channels);
// CV_Assert(scr_channels.size() == 4 && dstt_channels.size() == 3);
if (scale < 1)
{
scr_channels[3] *= scale;
scale = 1;
}
for (int i = 0; i < 3; i++)
{
dstt_channels[i] = dstt_channels[i].mul(new Mat(scr_channels[3].size(), CvType.CV_8UC1, new Scalar(255.0 / scale)) - scr_channels[3], scale / 255.0);
dstt_channels[i] += scr_channels[i].mul(scr_channels[3], scale / 255.0);
}
Core.merge(dstt_channels, dst);
return true;
}