标签：讲解 cal span detail 像素 next gen open www.
void RandomBrightness(const cv::Mat& in_img, cv::Mat* out_img, const float brightness_prob, const float brightness_delta) { float prob; caffe_rng_uniform(1, 0.f, 1.f, &prob); if (prob < brightness_prob) { CHECK_GE(brightness_delta, 0) << "brightness_delta must be non-negative."; float delta; caffe_rng_uniform(1, -brightness_delta, brightness_delta, &delta); AdjustBrightness(in_img, delta, out_img); } else { *out_img = in_img; } }
void AdjustBrightness(const cv::Mat& in_img, const float delta, cv::Mat* out_img) { if (fabs(delta) > 0) { in_img.convertTo(*out_img, -1, 1, delta); } else { *out_img = in_img; } }
opencv的convertTo的讲解:https://blog.csdn.net/qq_22764813/article/details/52135686
https://blog.csdn.net/qq_15505637/article/details/53887274
type是是否改变深度的,即uint8、uint16、float等,-1就是保持不变
scale是比例因子,即每个像素值需要乘的值
shift是在每个像素上加上的值
opencv调整亮度:https://blog.csdn.net/hb707934728/article/details/74914104
g(i,j)=a*f(i,j)+b a是调整对比度,b是调整亮度,实际上就是scale调整对比度,shift调整亮度,这里就是对比度不变,调整亮度
caffe_rng_uniform:生成n个在a、b之间均匀分布的值
uniform distribution:均匀分布
http://www.voidcn.com/article/p-hqhoassv-qh.html
void caffe_rng_uniform(const int n, const Dtype a, const Dtype b, Dtype* r) { CHECK_GE(n, 0); CHECK(r); CHECK_LE(a, b); boost::uniform_real<Dtype> random_distribution(a, caffe_nextafter<Dtype>(b)); boost::variate_generator<caffe::rng_t*, boost::uniform_real<Dtype> > variate_generator(caffe_rng(), random_distribution); for (int i = 0; i < n; ++i) { r[i] = variate_generator(); } }
标签：讲解 cal span detail 像素 next gen open www.
原文地址：https://www.cnblogs.com/ymjyqsx/p/9164813.html
