How to automatically add rainbow special effects to pictures by OpenCV

Editor to share with you how OpenCV automatically add rainbow special effects to pictures, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

Implementation step [1] prepare a picture of summer scenery, load and read Mat src = imread ("summer.jpg")

[2] create a black map of the same size as the original image, and then draw a rainbow Mat dst;int row = srcImg.rows;int col = srcImg.cols;Mat img (row, col, CV_8UC3, Scalar::all (0)) by drawing an elliptic function; ellipse (img, Point (col/2, row*4/5), Size (col/2+100, row*4/5), 180,0,180, Scalar (255j0128), 5) Ellipse (img, Point (col/2,row*4/5), Size (col/2-8, 0,180, Scalar (255 Lot0), 5); ellipse (img, Point (col/2,row*4/5), Size (col/2-8, 0,180), Scalar (255, 0,180) Ellipse (img, Point (col/2,row*4/5), Size (col/2-80003), 180,0,180, Scalar (0pr 255 (col/2,row*4/5), 5); ellipse (img, Point (col/2,row*4/5), Size (col/2-84th 100th RWBG), 180,0,180, Scalar (0255255), 5) Ellipse (img, Point (col/2,row*4/5), Size (col/2-8135m100), 180,0,180, Scalar (0128255), 5); ellipse (img, Point (col/2,row*4/5), Size (col/2-8pp61600), Scalar (0m0255), 5)

[3] Gaussian blur, soften rainbow edges and transition GaussianBlur (img, img, Size (7,7), 0,0)

[4] mixed superposition of rainbow image and landscape map (better with Poisson fusion) addWeighted (srcImg, 1.0, img, 0.2,0, dst)

Change a few pictures to test:

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