How do I equalize contrast & brightness of images using opencv?

stackoverflow.com - 2012-05-12 07:02:03 - Similar - Report/Block

I've got an image that I've scanned, but the white paper is not white on the screen. Is there a way to equalize the contract/brightness to make the background whiter? Update I've tried the suggested Image._EqualizeHist function from EmguCv: string file = @"IMG_20120512_055533.jpg"; Image<Bgr, byte> originalColour = new Image<Bgr,...

Java book for image editing such as brightness/contrast etc (newbie friendly)

stackoverflow.com - 2010-09-08 20:09:49 - Similar - Report/Block

Is there any book or very informative tutorial site which can help newbies learn how to alter pixels with a loaded image in the java GUI? I want to learn how exactly I would be able to do things such as changing the brightness and contrast of an image, invert it, smooth it and also learn how to do histograms. So far I only know how to use...

Opencv Motion detection with tracking

stackoverflow.com - 2011-08-11 04:35:09 - Similar - Report/Block

I need a robust motion detection and tracking in web cam's video frames. The background is always the same. The aim is to identify the position of the object, if possible without the shadows, but not so urgent to remove shadows. I've tried the opencv algorithm for background subtraction and thresholding, but this depends on only one image...

Adjust How Auto-Brightness Works In iOS With The AutoBrightness Cydia Tweak

ijailbreak.com - 2013-06-05 18:30:23 - Similar - Report/Block

A new tweak was released today called AutoBrightness that will set the brightness according to your ambient light conditions. In contrast to how iOS handles auto brightness, this particular Cydia tweak will also make it so that the brightness decreases when ambient light is decreased. This often times useful because when you are using yo...

Scientific image display python

stackoverflow.com - 2012-03-07 22:46:23 - Similar - Report/Block

Is there a full feature image display lib for python? With the ability to identify pixel values, plot profiles, adjust brightness/contrast etc - something like ImageJ matplotlib scipy-skimage all do little more than put up a bitmap in a TK window. I can't get opencv to use the new Qt highgui window in python. Any suggestions? ps. And it...

How to display streaming images in OpenCV?

stackoverflow.com - 2011-10-11 16:20:06 - Similar - Report/Block

I'd like to implement the live view function using EDSDK. I have used EdsGetPointer to get the pointer of the memory address for memory streaming. Now I want to display the streaming image on the PC. I have read in some people use the API on VisualC such as ATL or CImage which able display the streaming image just by passing the pointer o...

OpenCV detect numbers

stackoverflow.com - 2011-05-03 19:51:59 - Similar - Report/Block

I'm using OpenCV on the iPhone and need to detect numbers in an image. I split the image into smaller images so each image has only one number (1-9). All numbers are printed, NOT handwritten. What would be the best approach to figure out the numbers with OpenCV? UPDATE: I have successfully found the numbers and extracted them. They look l...

Screen brightness - what is best for your eyes when reading?

thestudentroom.co.uk - 2013-04-25 17:17:54 - Similar - Report/Block

I was just wondering, which is less damaging to your eyes when you're reading off a screen - having the screen fairly bright or quite dim? I tend to have mine at the lowest setting, thinking that having it brighter would be more damaging, but then it also occurred to me that a dimmer screen means less contrast, so surely you're straining...

gamma and contrast: the gamma modifies the contrast value?

avforums.com - 2013-03-07 10:24:06 - Similar - Report/Block

I have a plasma, and I know that if I have a high contrast I could have retentions or burn in. So I prefer to have a low contrast in the channels with logos and to have a good calibration in good sources like blu ray. So I have a contrast in a low value for this channels, the gamma by default is in 2.2, but I notice that when I set the ga...

Getting started with OpenCV 2.4 on Windows 7

stackoverflow.com - 2012-06-02 08:33:14 - Similar - Report/Block

I'm very new to OpenCV but I got interested in Computer Vision. I see that version 2.4 is available for download in the OpenCV Wiki. The questions: How to install OpenCV 2.4 in Windows 7? What C++ compiler should I use? Can you provide me with a "Hello, World!" example?...

Program cannot run OpenCV even thoough others can

stackoverflow.com - 2012-06-02 01:06:24 - Similar - Report/Block

Hello I am trying to run a program that uses OpenCV and I have gotten it to run on other machines and other programs on my machine run using it but this one returns: programname.cpp: fatal error: opencv/cv.h: No such file or directory Anyone know how to fix the path or what might be going wrong? I am running Ubuntu 12.04 and OpenCV-2.4.0...

HTML5 Canvas image contrast

stackoverflow.com - 2012-05-09 20:29:14 - Similar - Report/Block

I've been writing an image processing program which applies effects through HTML5 canvas pixel processing. I've achieved Thresholding, Vintaging, and ColorGradient pixel manipulations but unbelievably I cannot change the contrast of the image! I've tried multiple solutions but I always get too much brightness in the picture and less of a...

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OpenCV SURF execution error message

stackoverflow.com - 2012-06-24 09:37:47 - Similar - Report/Block

When i try to run the sample find_obj.cpp or any OpenCV SURF program i get the following error in command prompt while executing the code. The build is error and warning free. I am using VS2011 beta , OpenCV 2.4 and windows7. ERROR MSG: OpenCV Error: The function/feature is not implemented < OpenCV was built without SURF support> in u...

build problems with Qt and opencv on Windows

stackoverflow.com - 2012-04-07 19:48:17 - Similar - Report/Block

I would like to create a gui application with Qt, using opencv on Windows XP. I used both Qt and opencv before, but never together. Long story short, I'm unable to get opencv work with Qt. As on all the forums I searched there are just little pieces of information scattered around, usually with no answer, I summarize here all the steps I'...

Books for OpenCV and Python?

stackoverflow.com - 2012-05-20 23:21:47 - Similar - Report/Block

Does anyone know if there are any books on OpenCV and Python? I have OReilly Learning OpenCV book but its for so I'm looking for books/pdfs/online tutorials specifically Python and OpenCV. I've looked at http://www.neuroforge.co.uk/index.php/ge tting-started-with-python-a-opencv was a helpful but I prefer having a book to work from.

OpenCV match template

stackoverflow.com - 2013-01-15 05:22:12 - Similar - Report/Block

I am trying to match a logo (template) I have with some images. My images are all colored in nature and the way I am doing it is using the cvMatchTemplate() from openCV and running the template (logo) over my source image. I scale the template to multiple levels to find the best match. Please note that I am just finding the digitally impr...

OpenCV Computer Vision with Python

wowebook.org - 2013-06-07 22:21:27 - Similar - Report/Block

eBook Details: Paperback: 122 pages Publisher: Packt Publishing (April 23, 2013) Language: English ISBN-10: 1782163921 ISBN-13: 978-1782163923 eBook Description: Set up OpenCV, its Python bindings, and optional Kinect drivers on Windows, Mac or Ubuntu Create an application that tracks and manipulates faces Identify face regions using...

Building OpenCV4Android from trunk

stackoverflow.com - 2013-03-24 13:44:17 - Similar - Report/Block

I am now developing a application and plans to use native OpenCV library by jni approach. Reference this tutorial as my environment. http://docs.opencv.org/doc/tutorials/int roduction/android_binary_package/O4A_SDK .html To use the nonfree module of the OpenCV such as SurfFeatureDetector, I have to build opencv myself and use the tutorial f...

Lock Brightness settings?

eightforums.com - 2013-03-13 03:27:07 - Similar - Report/Block

Well, I have installed Windows 8 on my laptop, but was wondering if there is a way to lock the screen brightness. The reason being is that family members constantly mess with the brightness and sometimes leave it at 100% when using the battery. I basically want to extend the life of the battery if it is possible by disabling or locking th...

Android OpenCV Image Rectification

stackoverflow.com - 2012-04-15 13:42:51 - Similar - Report/Block

i'm tryin to do image rectification without calibration , just using fundamental Matrix and using OpenCV Here things that i've done till now : Find Matches between two images using SURF and FLANN Descriptor Matcher List good_match = getGoodMatch(img1,img2); --> it's done , and the result is good Get Matching Point for img1 and img2 Get F...

Brightness changing randomly on Samsung Slate 7 Windows 8

eightforums.com - 2012-11-08 08:03:52 - Similar - Report/Block

Hi everyone, I have this strange problem with Samsung Slate series 7 since I've upgraded to Windows 8 pro 64. The screen brightness keeps changing randomly when it is at a low level. I have tried to disable auto brightness, put adaptive brightness off and disable the sensor monitoring service but nothing seems to work. I hope someone can...

How to add opencv window in pygtk?

stackoverflow.com - 2012-03-21 20:04:48 - Similar - Report/Block

I want to make a program in python using pygtk, which would execute my opencv codes, and give output, so that I can show it in GUI. opencv codes are written in C. I want a window/widget in my GUI, which would belong to opencv, so that whenever any event occurs in that widget, like mouse pointer moves in the widget, it should execute my op...

Photoshop mystical light actions / PSDs - free

deviantart.com - 2012-06-10 11:43:43 - Similar - Report/Block

Photoshop actions + PSD files. Free download, enjoy What are photoshop actions? Photoshop Actions are the recordings of commands that can be applied to one image or multiple images in photoshop. When you press play, it applies these recorded commands. These recorded commands are edit effects you can create in photoshop, think about changi...

OpenCV webcam frame rate

stackoverflow.com - 2012-06-08 12:08:32 - Similar - Report/Block

I have a webcam that is capable of 1080p 30fps which I have confirmed by using VirtualDub to preview and save a video from the webcam itself. For some reason OpenCV will only give me around 4FPS, the CPU isn't maxing out any of the cores so I can't see why? (This is without actually outputting the feed by the way, just fetching the frames...

OpenCV : convert the pointer in memory to image

stackoverflow.com - 2012-04-12 15:35:27 - Similar - Report/Block

I have a grabber which can get the images and show them on the screen with the following code while((lastPicNr = Fg_getLastPicNumberBlockingEx(fg,lastPic Nr+1,0,10,_memoryAllc))<200) { iPtr=(unsigned char*)Fg_getImagePtrEx(fg,lastPicNr,0,_m emoryAllc); ::DrawBuffer(nId,iPtr,lastPicNr,"testing "); } but I want to use the pointer to th...

Eizo FS2333 - Which one to keep?

hardforum.com - 2013-06-10 01:00:35 - Similar - Report/Block

I'm opening this new thread to not spam into the official fs2333 thread. Long story short: I've a fs2333 and my Spyder4 Pro gives me a contrast ratio of 440:1. So I've contacted Amazon for a replacement. The new monitor has similar values (So I'm going to think that it's not the Eizo that is faulty, but the Spyder4 Pro instead). Which one...

Dell Inspiron 5522 brightness, almost solved

fedoraforum.org - 2013-05-09 19:15:38 - Similar - Report/Block

Hi there. Although the Fn-F4 and Fn-F5 buttons show a brightness icon on the screen, they do nothing. So I wrote three scripts, brightness_up.sh looks like: Code: #!/bin/bash CURR="`cat /sys/class/backlight/intel_backlight/bri ghtness`" let NEW=CURR+200 /usr/bin/sudo /usr/local/bin/setbright ${NEW} and setbright looks like: Code: #!/bin/ba...

Monitor Noise Problem

techimo.com - 2013-03-16 09:09:07 - Similar - Report/Block

My monitor is S22B350. It starts to have high pitch noise when I set 13 to brightness and contrast. After I switch using the mode to Game and so on from Samsung MAGIC Bright, the noise is gone.

How to use OpenCV2.2 with Dev C++

stackoverflow.com - 2011-05-26 12:53:49 - Similar - Report/Block

I wish to use opencv on my project work. Therefore, I downladed OpenCV2.2 http://sourceforge.net/projects/opencvli brary/ and installed it. Then I made following configuration in Dev C++ since i am using Dev C++ compiler for my works; OpenCV library is installed in the C:\ OpenCV2.2 directory Open Dev C++ and Tools -> Compiler O...

OpenCV Cascade Classification with Histogram of Oriented Objects (HOGs) feature type

stackoverflow.com - 2012-04-06 03:33:15 - Similar - Report/Block

I am trying to use the OpenCV's cascade classifier based on Histogram of Oriented Objects (HOGs) feature type -- such as the paper "Fast Human Detection Using a Cascade of Histograms of Oriented Gradients". Searching in the web, I found that the Cascade Classificator of OpenCV only supports HAAR/LBP feature type ( OpenCV Cascade Classifi...

OpenCV, calling contourArea causes assertion failure in getMat

stackoverflow.com - 2012-03-14 11:41:30 - Similar - Report/Block

I'm using openCV 2.3.1 on Xcode4 OS X 10.7 I've got a (demo) code which finds contours after some basic background subtraction and displays it in various colors. This part works. I would like to filter out contours smaller than a specific size, but when I call contourArea(), I get the following assertion fail: OpenCV Error: Assertion fail...

The Zeki Tablet goods, bads and fixes

androidtablets.net - 2012-07-29 22:13:40 - Similar - Report/Block

The quality of the product varies. One post mentions having two and one with low range on wi-fi which was exchanged and they work fine. Mine had a vertical line appear on the screen on the second day. It was easily exchanged. The brightness could be a little brighter. The widget with the brightness bar was added and it may have made it br...

Changing the Screen Brightness System Setting Android

stackoverflow.com - 2011-07-15 16:36:14 - Similar - Report/Block

I'm attempting to change the screen brightness from withing a service, like so: android.provider.Settings.System.putInt( getContentResolver(), android.provider.Settings.System.SCREEN_ BRIGHTNESS, bright); Problem is that is doesn't work. Well, actually it succeeds in changing the brightness setting, but the screen brightness doesn't actuall...

Interface from OpenGL to OpenCV

gamedev.net - 2013-04-17 03:53:59 - Similar - Report/Block

Hi, everyone. I wanted to process a image by OpenCV. It's generated by OpenGL. Firstly, I saved this image in my hard disk and read it with OpenCv, but I found it inefficient. So I want to find an interface from OpenGL to OpenCV so that I don't need to save the image to my hard disk. The function " load3dDataToGL" is not what I want. I ju...

OpenCV error in android

stackoverflow.com - 2012-06-25 12:09:23 - Similar - Report/Block

I have successully compiled opencv test example (videoemulation), but on running on emulator its giving me strange error. 06-25 15:36:34.526: D/dalvikvm(621): Trying to load lib /data/data/org.siprop.opencv /lib/libopencv.so 0x405139b0 06-25 15:36:34.566: D/dalvikvm(621): Added shared lib /data/data/org.siprop.opencv/lib/libopen cv.so 0x...

Converting a .mat file from MATLAB into cv::Mat matrix in OpenCV

stackoverflow.com - 2012-07-18 22:44:21 - Similar - Report/Block

I have some MATLAB code that I want to migrate to OpenCV. The data that the MATLAB code uses is stored in a .mat file which is then loaded at run time. I converted this .mat file into a .csv file and am then reading this data into OpenCV as a string using ifstream. I am having problems converting this string into a data-structure that I c...

How to fill an array of Vec3b

stackoverflow.com - 2012-06-12 09:54:45 - Similar - Report/Block

I am working with images in C++ with OpenCV. I made a code with and uchar array of two dimensions where I can read pixel values of an image, uploaded with imread in grayscale using .at< uchar>(i,j) However I would like to do the same thing for color images. Since I know that to access the pixels values I now need .at< Vec3b>(i...

Notebook display brightness low when plugging out power cable?

sevenforums.com - 2013-06-11 20:07:53 - Similar - Report/Block

As long as the power cable is plugged in in my notebook the brightness of my display is fine. But when I plug it out and use the battery the brightness becomes suddenly darker. Why? How can I prevent this switch-to-dark-screen? I found no corresponding option in the power plans...

openCV dominant color

developpez.net - 2013-03-06 12:18:53 - Similar - Report/Block

Bonjour, J'ai un programme qui ouvre une vidéo et parcoure ses images dans l'ordre. Je veux calculer le pourcentage des couleurs présents dans chaque image et par la suite déduire la couleur dominante. Comment je peux faire ça avec OpenCV Merci pour votre aide...

#include "_cv.h"の設定を教えて

goo.ne.jp - 2012-06-22 09:35:18 - Similar - Report/Block

VisualStudioC++2010を用いて、#include "_cv.h"を使用したいのですが、ファイルが存在する場所 「C:\Program Files\OpenCV\cv\src」を追加のインクルードファイルに入れても以 下のエラーがでます。 C:\Program Files\OpenCV\cv\src\_cv.h(84): error C2146: 構文エラー : ';' が、識別子 'icvDepthToDataType' の前に必要です。 C:\Program Files\OpenCV\cv\src\_cv.h(84): error C2433: 'CvDataType' : 'inline' はデータ宣言をするのに使用できません。 C:\Program F...


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