{"id":19335,"date":"2022-11-06T07:55:22","date_gmt":"2022-11-06T02:25:22","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-applying-an-algorithm-to-a-specific-region-of-an-image-closed\/"},"modified":"2022-11-06T07:55:22","modified_gmt":"2022-11-06T02:25:22","slug":"solved-applying-an-algorithm-to-a-specific-region-of-an-image-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-applying-an-algorithm-to-a-specific-region-of-an-image-closed\/","title":{"rendered":"[Solved] Applying an algorithm to a specific region of an image [closed]"},"content":{"rendered":"

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Using a mask defined by any of the “imroi” functions – imfreehand and imellipse included, you can use roifilt2 to filter just the roi using a given filter or function.<\/p>\n

First, define the area:<\/p>\n

imshow(I); %display your image\nh = imfreehand; % now pick the region\nBW = createmask(h); %makes BW mask\n<\/code><\/pre>\n
Then, use roifilt2 in one of the following ways – <\/p>\n
Define a filter and apply it:<\/p>\n
H = fspecial('unsharp');\nI2 = roifilt2(H,I,BW);`\n<\/code><\/pre>\n
Apply a given function to the roi:<\/p>\n
I2 = roifilt2(I, BW, 'histeq');<\/code><\/p>\n
Apply a given function to the roi, specifying parameters:<\/p>\n
fh = @(I)(histeq(I,5)); %define function\nI2 = roifilt2(I, BW, fh); \n<\/code><\/pre>\n
The last is equivalent to calling I2 = hist(I,5); but only works on the defined roi.<\/p>\n
ETA:<\/p>\n
If you want to call multiple functions on the roi, it may be easiest to define your own function, which takes an image input (and optionally, other parameters), applies the appropriate filters\/functions to the image, and outputs a final image – you would then call “myfunc” in the same way as “histeq” above.<\/p>\n<\/p><\/div>\n
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            3<\/span> <\/p><\/div>\n<\/div>\n
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solved Applying an algorithm to a specific region of an image [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Using a mask defined by any of the “imroi” functions – imfreehand and imellipse included, you can use roifilt2 to filter just the roi using a given filter or function. First, define the area: imshow(I); %display your image h = imfreehand; % now pick the region BW = createmask(h); %makes BW mask Then, use … 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":[320],"tags":[516,2806,4610],"class_list":["post-19335","post","type-post","status-publish","format-standard","hentry","category-solved","tag-matlab","tag-region","tag-roi"],"yoast_head":"\n[Solved] Applying an algorithm to a specific region of an image [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-applying-an-algorithm-to-a-specific-region-of-an-image-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Applying an algorithm to a specific region of an image [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Using a mask defined by any of the “imroi” functions – imfreehand and imellipse included, you can use roifilt2 to filter just the roi using a given filter or function. First, define the area: imshow(I); %display your image h = imfreehand; % now pick the region BW = createmask(h); %makes BW mask Then, use ... 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