python - Concatenate large numpy arrays in RAM -


i have 3d image data , want build stack of rgb images out of single channel stacks, i.e. try concatenate 3 arrays of shape (358, 1379, 1042) 1 array of shape (358, 1379, 1042, 3). inspired skimage.color.gray2rgb tried

np.concatenate((     stack1[..., np.newaxis],      stack2[..., np.newaxis],      stack3[..., np.newaxis]), axis=-1)

however, though each of these stacks 1gib fills empty ~12gib ram ... tried pre-allocate array of final shape , fill stacks, like

rgb_stack = np.zeros(stack1.shape + (3,)) rgb_stack[:,:,:,0] = stack1

which exhausted ram once execute second line. tried explicitly copy data stack1 rgb_stack by

rgb_stack = np.zeros(stack1.shape + (3,)) rgb_stack[:,:,:,0] = stack1.copy()

with same result. doing wrong?

to wrap can learnt comments question; np.zeros creates array of float64 12gib big. not fill ram linux on commits , sets corresponding ram aside once array gets filled, in case once gets filled image data.

thus creating zeros dtype solves problem, e.g.

rgb_stack = np.zeros(stack1.shape + (3,), dtype=np.uint16) rgb_stack[:,:,:,0] = stack1.copy()

works fine uint16 stacks.


Comments

Post a Comment

Popular posts from this blog

android - Pass an Serializable object in AIDL -

i have defined aidl file interface imyfeature { void dotask(class clazz); } but need pass class object process. possible in android? if so, how? i tried: interface imyfeature { serializable class; void dotask(class clazz); } but doesn’t work. aidl in android supports custom class implement parcelable interface. in case want send class object not possible. can send class canonical name , retrieve in service. for example have aidl file interface imyfeature { void dotask(string classname); } then call : binder.dotask(myclass.class.getcanonicalname()); and in service binder stub implementation : private final imyfeature mbinder = new imyfeature.stub() { public void dotask(string classname) { try { class<?> clazz = class.forname(classname); constructor<?> ctor = clazz.getconstructor((class[]) null); object object = ctor.newinstance(); ...
Read more

How to provide Authorization & Authentication using Asp.net, C#? -

Image
i have asp.net application in c#. i have provide page authorization specific user/usergroup. i have created 2 tables in database: 1) pagename 2)permissions[insert, update, view, delete] but i'm unable match tables , permissions assigning... can 1 please me, how created tables in database , how coding. please me. you can below explanation. configure access specific file , folder, set forms-based authentication. request page in application redirected logon.aspx automatically. in web.config file, type or paste following code. this code grants users access default1.aspx page , subdir1 folder . <configuration> <system.web> <authentication mode="forms" > <forms loginurl="login.aspx" name=".aspnetauth" protection="none" path="/" timeout="20" > </forms> </authentication> <!-- section denies access files in...
Read more

How to use Authorization & Authentication in Asp.net, C#? -

i using roll management , trying give page , folder access according user or user group, using server created ad group user authentication. i have default1.aspx page default , subdir1 folder give different access separate user group i using below logic in web.config. <location path="subdir1"> <system.web> <authorization> <allow users ="?" /> </authorization> </system.web> </location> i facing problem provide same access 2 or more directory same user should have provide allow user code twice both folder? i can use logic repeating value folder want access providing in 1 logic. i have got answer configure folder/page access, have make different access shown below.. configure access specific file , folder, set forms-based authentication. request page in application redirected logon.aspx automatically. in web.config file, done following code. this code grants user...
Read more