php - Cleaning pixels from a map -

-

map

we have map, need use php take shades of blue out, percentages. problem is, of percentages in same color borders, , other times, percentages go border. need use image.

there not (afaik) easy ways.

the easiest way doesn't give results: separate channels , delete small components.

the result this:

enter image description here

as can see there few numbers , percent signs remaining because connected delimiting lines , deleting small components doesn't work them.

if need better job, should correlate image template of each number, , once identified, delete it.

here can see result of correlation number "2":

enter image description here

one wrong "2" identified, (see top left), more sophisticated approach may needed general procedure.

anyway, think these kind of manipulation beyond can expect k-12.

hth!

edit

as per request, detail first method.

you first separate 3 channels, , 3 images:

enter image description here

you keep third (the blue channel)

then need delete smaller components. there lot of methods that, easiest derived connectivity detection example in flood-fill algorithm, measure components without filling them.
basic (not optimized) idea travel every pixel in image , count how many pixels "connected" it. if there less specified number (threshold), delete whole set. image manipulation libraries have these functions implemented.


Comments

Post a Comment

Popular posts from this blog

Javascript line number mapping -

-
magically formatted comments change reported line number of javascript errors in browsers; this: //@line n "f" n line number , f file name. unfortunately, //@line appears ungoogleable. know there documentation on feature, , browsers support it? (i found references here , here .) from can find available in mozilla based browsers. it using js_setoptions command can turn these options on or off depending on values passed. https://developer.mozilla.org/en/js_setoptions
Read more

c# - Is it possible to remove an existing registration from Autofac container builder? -

-
something along lines: builder.registertype<mytype>().as<itype>(); builder.registertype<mytype2>().as<itype>(); builder.deregistertype<mytype>().as<itype>() var container = builder.build(); var types = container.resolve<ienumerable<itype>>(); assert.istrue(types.count == 1); assert.istrue(types[0].gettype == typeof(mytype2)); scenario: go through bunch of assemblies , go register types want make sure have 1 implementation of given type. need before create container. track on own nice if autofac me bit. this cannot done directly using containerbuilder , unless start on new one. mind you, having first built container should able construct new container filtering away unwanted types , reusing registrations first container. this: ... var container = builder.build(); builder = new containerbuilder(); var components = container.componentregistry.registrations .where(cr => cr.activator.limittype != typ...
Read more

php - Mysql PK and FK char(36) vs int(10) -

-
i have read mysql can handle indexes , searches better if tables keys integers rather char(36) uuid's. is worth converting int(10)? note: use 1 server , have have plans use multiple databases concurrently therefore removing 1 of big reasons using uuid. our tables innodb if makes difference. thanks in advance. usually rdbms can handle integer keys pk more efficient, other datatypes. reason how build index column, yes: long dont require string (or other typed) keys, should use integers. however: char(36) , int(10) far away being equal, because int(10) much smaller, char(36). dont know, if require many different keys, should keep in mind. update, complete last paragraph: int(10) 32-bit, char(36) 36 - ^byte^ (= 288-bit). not mean, int consumes less space, means, char(36) has 4 times more different keys.
Read more