![\"\"](\"http:\/\/rageworx.info\/wp-content\/uploads\/2017\/05\/srcimg_clahe_wlvl.png\")
<\/a><\/p>\nEach edge side of object going too darken by window leveling. It is defecting issue of CLAHE. So I tried to make it corrected with shading correction.<\/p>\n
Here is source raw image, 14bit gray. First, I need make a background mask to overriding changed level after CLAHE.<\/p>\n It can generate simply by using my librawprocessor. Then I applied CLAHE, 10×10, 30.0f.<\/p>\n Shadowed or shaded areas occurs after applying CLAHE, it must be corrected. So I made shaded map with my fast resize engine. Down scale to 10% of original image size with Bi-Linear filter, then up scale again with B-Spline filter with inverse.<\/p>\n It is much effective than Gaussian blur. Very fast but similar to Gaussian blurred. almost realtime in 3000×3000 array with floating point\u00a0 levels in AVX and OpenMP optimization.<\/p>\n Now I am just add masked shade map level with exponential to original image.<\/p>\n Result is :<\/p>\n Shaded object areas seems to enhanced than before. So I continued to applying background mask.<\/p>\n Ok, then I made it to window leveled.<\/p>\n Each edge sides are not seems to much shaded than before. It should be better than applying single CLAHE. I will continue to write more effective image processing with CLAHE.<\/p>\n","protected":false},"excerpt":{"rendered":" By using CLAHE algorithm, there’s some problem occurs by object shapes like this: Each edge side of object going too darken by window leveling. It is defecting issue of CLAHE. So I tried to make it corrected with shading correction. Here is source raw image, 14bit gray. First, I need… Read more »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,445,438,3],"tags":[507,509,195,446,508],"class_list":["post-1348","post","type-post","status-publish","format-standard","hentry","category-development","category-examination","category-medical","category-raphs","tag-clahe","tag-correction","tag-image","tag-medical","tag-shade"],"_links":{"self":[{"href":"https:\/\/rageworx.info\/index.php?rest_route=\/wp\/v2\/posts\/1348","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rageworx.info\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rageworx.info\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rageworx.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rageworx.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1348"}],"version-history":[{"count":0,"href":"https:\/\/rageworx.info\/index.php?rest_route=\/wp\/v2\/posts\/1348\/revisions"}],"wp:attachment":[{"href":"https:\/\/rageworx.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1348"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rageworx.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1348"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rageworx.info\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1348"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n{\r\n if ( ( src == NULL ) || ( smap == NULL ) )\r\n return;\r\n\r\n if ( src->Width() != smap->Width() )\r\n return;\r\n\r\n if ( src->Height() != smap->Height() )\r\n return;\r\n\r\n float* datasrc = src->Data();\r\n float* datamap = smap->Data();\r\n\r\n #pragma omp parellel for\r\n for( unsigned cnt=0; cnt< src->Size(); cnt++ )\r\n {\r\n float diffs = datamap[ cnt ];\r\n\r\n if ( diffs > 0.0f )\r\n {\r\n datasrc[ cnt ] += exp( diffs );\r\n }\r\n }<\/pre>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n