fix medianBlur accessviolation

Jejos · Jejos · commit 5169c79978ec · 2017-02-28T08:31:28.000+01:00
medianBlur called with "empty" source and ksize &gt;= 7 crashes application with accessviolation. With this extra assert this is avoided and the application may normally catch the thrown exception.
diff --git a/modules/imgproc/src/smooth.cpp b/modules/imgproc/src/smooth.cpp
@@ -3494,7 +3494,7 @@ void cv::medianBlur( InputArray _src0, OutputArray _dst, int ksize )
 
     CV_Assert( (ksize % 2 == 1) && (_src0.dims() <= 2 ));
 
-    if( ksize <= 1 )
+    if( ksize <= 1 || _src0.empty() )
     {
         _src0.copyTo(_dst);
         return;

Original file line number	Diff line number	Diff line change
`@@ -3494,7 +3494,7 @@ void cv::medianBlur( InputArray _src0, OutputArray _dst, int ksize )`
`3494`	`3494`
`3495`	`3495`	`CV_Assert( (ksize % 2 == 1) && (_src0.dims() <= 2 ));`
`3496`	`3496`
`3497`		`- if( ksize <= 1 )`
	`3497`	`+ if( ksize <= 1 \|\| _src0.empty() )`
`3498`	`3498`	`{`
`3499`	`3499`	`_src0.copyTo(_dst);`
`3500`	`3500`	`return;`