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Questions tagged [blobs]

94 questions
281
votes
11 answers

How do I convert from BLOB to TEXT in MySQL?

I have a whole lot of records where text has been stored in a blob in MySQL. For ease of handling I'd like to change the format in the database to TEXT... Any ideas how easily to make the change so as not to interrupt the data - I guess it will need…
Gwilym
30
votes
3 answers

Properly Create and Serve PDF Blob via HTML5 File and URL APIs

Ok, Let's say I have document data stored somewhere, let's arbitrarily take this pdf. Issue #1. What I want to do is make an AJAX call to this URL (because I need to pass some authentication headers and it is cross domain). Then take the returned…
Eric H.
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26
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2 answers

python opencv - blob detection or circle detection

I am having problems detecting circle areas. I tried it with the HoughCircles function from opencv. However even though the images are pretty similar the parameters for the funtion have to be different in order to detect the cirles. Another…
cmplx96
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15
votes
2 answers

How to get hold of all the blobs in a Blob container which has sub directories levels(n levels)?

Tried using the ListBlobsSegmentedAsync method , but this returns only the blobs from the main parent directory level .. But I need the entire list of blobs at one go from all the n levels of subdirectories. BlobContinuationToken continuationToken…
NITHESHKUMAR R
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8
votes
1 answer

Persisting Blob Streams with NHibernate

If I have a class declared as: public class MyPersistentClass { public int ID { get; set; } public Stream MyData {get;set; } } How can I use NHibernate's mappings to persist the MyData property to and from the database?
plaureano
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7
votes
2 answers

__BlobFileIndex__ fills Datastore Quota

I serialize objects to blobstore in my app, and delete and recreate them whenever they change. I know this is not the best way, but I found that is good way for rapid prototyping. Now I am in the phase to use datastore, however I have a problem. My…
Cigiller
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6
votes
2 answers

How to replace the deprecated BlobBuilder with the new Blob constructor?

Since Blobbuilder is deprecated and I have recently decided to use a new facial recognition API I am having a hard time switching over to just "blob". function dataURItoBlob(dataURI, callback) { // convert base64 to raw binary data held in a…
shayward
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4
votes
1 answer

Oracle BLOB Extraction Very Slow

I am having performance issues when extracting BLOBS from an oracle 10gR2 10.2.05 database I administer. I have around 400 files stored as BLOBS that I need to write out to the file system. Below is my code. When I execute this procedure the first 8…
spaghettiwestern
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4
votes
3 answers

Append text to Blob in Azure

After looking at this tutorial on blobs: channel 9, I was thinking of using a blob container to save a bunch of tweets (storing the json of each tweet that is). Ideally I would like to create a blob reference for each hour of the day, and append new…
jlezard
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4
votes
2 answers

Listing the files, which are inside a Blob?

Just started working on with Windows Azure and Mapreduce. I've already created an HDInsight cluster within the Azure Portal and also created a Block Blob using the Azure Explorer named BlobFiles. What I wanted to know is, is there a way of listing…
Kulasangar
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4
votes
2 answers

counting objects & better way to filling holes

I am new to OpenCV and am trying to count the number of objects in an image. I have done this before using MATLAB Image Processing Toolbox and adapted the same approach in OpenCV (Android) also. The first step was to convert an image to gray scale.…
jainam
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4
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3 answers

Is it possible to use ViBe algorithm, implemented in opencv, for systema without GPU?

I want to test ViBe algorithm for Background Subtraction. Currently I am using opencv libraries. I found out a sample implementation in opencv/samples/gpu/bgfg_segm.cpp and bgfg_vibe.cpp files. These files are under gpu module. Now I have a system…
sam18
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3
votes
2 answers

How to read a BLOB(Text) field using TpFIBQuery components from FibPlus

I am using Delphi 7 with the FibPlus components . One of them being TpFIBQuery. I am loading data from a table with the generic select * from TableName where Key = 1 One of the fields returned is of type BLOB(Text). I can't seem to get the value…
Edelcom
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3
votes
2 answers

Javacv Blob detection

I would like to use some blob detection in my application which is written in Java and thus using JavaCV instead of OpenCV. I found many classes like: SimpleBlobDetector, CvBlobDetector, CvBlob, ... but I can't find any tutorial or demo/example code…
hhoud
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3
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3 answers

Problems uploading blobs onto App Engine

Hi i'm trying to upload some mp3s as blobs using the Complete Sample App code provided in the App Engine tutorial here and i'm getting the following error `HTTP ERROR 404 Problem accessing…
user676567
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