From 0533dbfedafdec012d08de41a740ce179dfedacd Mon Sep 17 00:00:00 2001
From: Souriya Trinh <souriya.trinh+github@gmail.com>
Date: Fri, 18 Oct 2024 23:35:11 +0200
Subject: [PATCH] When testing on multiple images, looks like inverse gamma is
 not needed.

---
 modules/imgproc/src/vpImgproc.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/modules/imgproc/src/vpImgproc.cpp b/modules/imgproc/src/vpImgproc.cpp
index f6f092d0eb..8e74f2ca23 100644
--- a/modules/imgproc/src/vpImgproc.cpp
+++ b/modules/imgproc/src/vpImgproc.cpp
@@ -329,13 +329,12 @@ void gammaCorrectionLogMethod(vpImage<unsigned char> &I, const vpImage<bool> *p_
   unsigned char inputRange = inputMax - inputMin;
 
   float gamma_computed = static_cast<float>((std::log(128.f) - std::log(256.f)) / (std::log(mean) - std::log(inputRange)));
-  float inverse_gamma = 1.f / gamma_computed;
 
   // Construct the look-up table
   unsigned char lut[256];
   float inputRangeAsFloat = static_cast<float>(inputRange);
   for (unsigned int i = inputMin; i <= inputMax; ++i) {
-    lut[i] = vpMath::saturate<unsigned char>(std::pow(static_cast<float>(i - inputMin) / inputRangeAsFloat, inverse_gamma) * 255.f);
+    lut[i] = vpMath::saturate<unsigned char>(std::pow(static_cast<float>(i - inputMin) / inputRangeAsFloat, gamma_computed) * 255.f);
   }
 
   I.performLut(lut);