blob

How to detect blue color object using opencv

由 此生再无相见时 提交于 2019-12-06 08:20:46
问题 i'm using that guide to detect blobs of a certain color. On that guide, it check for orange's blob and it use this values: int orange[3] = {200, 250, 10}; On the guide it says that this values represents the orange in HSV. I don't know how they calculate this values but i try to check for blue value converting from rgb to hsv but it doesn't work. What i have to detect is this color: Any ideas on how to determinate HSV values to detect colors? thanks!! 回答1: For blue , it can be used as HSV

PHP MySQL: Saving PDF to Database

由 筅森魡賤 提交于 2019-12-06 08:15:31
问题 I am generating PDFs with TCPDF, I want to save the generated pdf as blob in a MySQL db. What data should I save to the db? Code for PDF page <?php require_once('../config/lang/eng.php'); require_once('../tcpdf.php'); // create new PDF document $pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false); // set document information $pdf->SetCreator(PDF_CREATOR); $pdf->SetAuthor('Nicola Asuni'); $pdf->SetTitle('TCPDF Example 001'); $pdf->SetSubject('TCPDF Tutorial')

Upload PDF file to mysql BLOB by using java.sql.PreparedStatement without corruption

由 回眸只為那壹抹淺笑 提交于 2019-12-06 08:09:44
问题 I tried to uplad a pdf file using java.sql.PreparedStatement to mysql Blob field using the following code. File inFile = new File("Path+BLOCK.pdf"); byte[] b = new byte[(int)inFile.length()]; PreparedStatement psmnt = (PreparedStatement) con.prepareStatement("INSERT INTO 2012DOC (SRNO,DOCUMENT) VALUES (?,?)" ); //con is java.sql.Connection object psmnt.setString(1, "1200021"); psmnt.setBytes(2, b); psmnt.executeUpdate(); This code executes without error and database shows blob content, but

react-native-fetch-blob is blocking firebase calls n react native app

由 老子叫甜甜 提交于 2019-12-06 06:36:13
问题 I have a react native app that uses Firebase, firestore. for uploading images i am using "react-native-fetch-blob" to create a Blob. in the js file that I use to upload the file, my code look like this: const Blob = RNFetchBlob.polyfill.Blob const fs = RNFetchBlob.fs window.XMLHttpRequest = RNFetchBlob.polyfill.XMLHttpRequest window.Blob = Blob ** window.XMLHttpRequest = RNFetchBlob.polyfill.XMLHttpRequest ** because of this window.XMLHttpRequest my app is blocked and not getting any response

Sending Audio Blob to server

由 大兔子大兔子 提交于 2019-12-06 06:34:19
I am trying to send an audio blob produced by WebAudio API and Recorder.js to my Laravel Controller using jQuery's $.post method. Here is what I am trying. $('#save_oralessay_question_btn').click(function(e){ var question_content = $('#question_text_area').val(); var test_id_fr = parseInt($('#test_id_fr').val()); var question_type = parseInt($('#question_type').val()); var rubric_id_fr = $('#rubric_id_fr').val(); var reader = new FileReader(); reader.onload = function(event){ var form_data = new FormData(); form_data.append('audio_data', event.target.result); var result = $.post('../questions'

How to convert jpg image to proper blob data type using php

由 最后都变了- 提交于 2019-12-06 05:45:34
<?php $file_name = $_FILES['files']['name']; $tmp_name = $_FILES['files']['tmp_name']; $file_size = $_FILES['files']['size']; $file_type = $_FILES['files']['type']; // The codes written above work fine and have proper information. $fp = fopen($tmp_name, 'r'); // This one crashes. $file_content = fread($fp, $file_size) or die("Error: cannot read file"); $file_content = mysql_real_escape_string($file_content) or die("Error: cannot read file"); fclose($fp); .... I'm a newbie to PHP stuff. I'm trying to store a jpg image as blob in a database but terribly struggling with it :( I tried many

How to Select a BLOB column from database using iBatis

由 会有一股神秘感。 提交于 2019-12-06 05:26:18
问题 One of a table's column is of BLOB datatype (Oracle 10g). We have a simple select query executed via iBatis to select the BLOB column and display it using Struts2 & JSP. The result tag in the iBatis xml file had the jdbctype as java.sql.Blob <result property="uploadContent" column="uploadcontent" jdbctype="Blob"/> Should we be mentioning any typeHandler class for Blob column ? Currently we are getting an error stating column type mismatch. Note: This column is selected and mapped into a java

How to represent an image from database in JSON

由 走远了吗. 提交于 2019-12-06 05:18:43
I need to create JSON based on a blob from database. To get the blob image, I use the code below and after show in json array: Statement s = connection.createStatement(); ResultSet r = s.executeQuery("select image from images"); while (r.next()) { JSONObject obj = new JSONObject(); obj.put("img", r.getBlob("image")); } I to want return a JSON object for the each image according the image blob. How can I achieve it? Binary data in JSON is usually best to be represented in a Base64 -encoded form. You could use the standard Java SE provided DatatypeConverter#printBase64Binary() method to Base64

representing BLOBs in C++

由 萝らか妹 提交于 2019-12-06 04:34:25
问题 Are there any STL containers that seem to be well-suited for using as BLOBs for database software? I would think a vector<char> , but is there something better? Maybe a std::string ? Or some non-STL container? 回答1: The BLOB type of databases allows storage of binary data, so you need an ordered collection of bytes. The easiest choice would be a vector<> and you could chose unsigned char to represent a byte on most platforms 回答2: We have used stream s in one of our projects to represent BLOB

How to insert images in blob in mysql table using only sql syntax (without PHP)?

由 蓝咒 提交于 2019-12-06 04:32:44
问题 Hi,I am new to SQL and I wanted to store images in the database.I already created a column with blob data type and tried to execute the following statement as given here INSERT INTO `abc` (`img`) SELECT BulkColumn FROM OPENROWSET( Bulk 'C:\Users\adity\Desktop\New folder\a.png', SINGLE_BLOB) AS BLOB which gives error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '( Bulk C:\Users\name\Desktop\New folder\a
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