From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Sat, 13 Oct 2012 01:01:39 +0000 (+0200)
Subject: Fix the mishandling of radius in the Gaussian deconvolution (it was off by a factor... 
X-Git-Tag: 1.0~285
X-Git-Url: https://git.sesse.net/?p=movit;a=commitdiff_plain;h=9bfa15dcbddfdeaaba490879362f74d75982ee2f

Fix the mishandling of radius in the Gaussian deconvolution (it was off by a factor of sqrt(2)).
---

diff --git a/deconvolution_sharpen_effect.cpp b/deconvolution_sharpen_effect.cpp
index ab28eb3..38cf0cf 100644
--- a/deconvolution_sharpen_effect.cpp
+++ b/deconvolution_sharpen_effect.cpp
@@ -268,8 +268,7 @@ void DeconvolutionSharpenEffect::update_deconvolution_kernel()
 			if (gaussian_radius < 1e-3) {
 				val = (x == 0 && y == 0) ? 1.0f : 0.0f;
 			} else {
-				float z = hypot(x, y) / gaussian_radius;
-				val = exp(-z * z);
+				val = exp(-(x*x + y*y) / (2.0 * gaussian_radius * gaussian_radius));
 			}
 			gaussian_h(y + 2 * R, x + 2 * R) = val;
 		}