c/c++_渐变动画制作_合成视频

1、渐变动画制作原理：

两幅图像加权相加，img = a*img1 + (1-a)img2，效果从img1变到img2，取值从1到0，取值间隔可以随意，间隔越小，视觉上越自然。

2、代码 (c/c++_渐变动画制作_合成视频)

    opencv版本是：3.4.5

#include <opencv2/opencv.hpp> #include <opencv2/opencv.hpp> using namespace cv; void gradient(cv::Mat& im1_src, cv::Mat& im2_src, VideoWriter writer, const char* save_pth_video) { cv::resize(im1_src, im1_src, cv::Size(im2_src.cols, im2_src.rows), 0, 0, cv::INTER_CUBIC); cv::Mat im_src_blur1, im_src_blur2, im_src_blur3, im_src_blur4, im_src_blur5, im_src_blur6, im_src_blur7, im_src_blur8, im_src_blur9; cv::Mat im_src_blur10, im_src_blur0; im_src_blur0 = 1 * im1_src + 0 * im2_src; im_src_blur1 = 0.9*im1_src + 0.1*im2_src; im_src_blur2 = 0.8*im1_src + 0.2*im2_src; im_src_blur3 = 0.7*im1_src + 0.3*im2_src; im_src_blur4 = 0.6*im1_src + 0.4*im2_src; im_src_blur5 = 0.5*im1_src + 0.5*im2_src; im_src_blur6 = 0.4*im1_src + 0.6*im2_src; im_src_blur7 = 0.3*im1_src + 0.7*im2_src; im_src_blur8 = 0.2*im1_src + 0.8*im2_src; im_src_blur9 = 0.1*im1_src + 0.9*im2_src; im_src_blur10 = 0 * im1_src + 1 * im2_src; cv::Size size = im_src_blur10.size(); writer.open(save_pth_video, CV_FOURCC('M', 'J', 'P', 'G'), 2, size, true); writer.write(im_src_blur0); writer.write(im_src_blur1); writer.write(im_src_blur2); writer.write(im_src_blur3); writer.write(im_src_blur4); writer.write(im_src_blur5); writer.write(im_src_blur6); writer.write(im_src_blur7); writer.write(im_src_blur8); writer.write(im_src_blur9); writer.write(im_src_blur10); } int main() { const char* save_pth_video = "a_result.avi"; const char* im1_pth = "./pic/1.png"; const char* im2_pth = "./pic/2.png"; cv::Mat im1_src = cv::imread(im1_pth); cv::Mat im2_src = cv::imread(im2_pth); VideoWriter writer; gradient(im1_src, im2_src, writer, save_pth_video); return 0; }

直接运行，就可以查看效果。

我采用的图像为：