adjust the scope value of bc regulate algorithm

OTSIncAMeasureApp/1-OTSMeasure/Measure/3-MeasureFlow/CBrightnessContrastAdjust.cs

@@ -380,7 +380,7 @@ namespace OTSMeasureApp._1_OTSMeasure.Measure._3_MeasureFlow
         {
            
           
-            var adjustScope =3;//the scope that sem brightness and contrast can be adjusted
+            double adjustScope =4;//the scope that sem brightness and contrast can be adjusted
 
             var error1 = desirebri - bri;
             var error2 = desiredark - dark;