custom grayscale conversion
I'm trying to improve my edge detection and found out, what is logical: some edges are detected better in the red channel, others in the green etc. I would like to use only one Canny-call and not three...
View ArticleMetal Edge Defect Detection
Hi, Need help in finding defects in metal(steel or aluminum) edge. Images are in gray scale, with edge in black background. If there is an impression formed by the improper cut of the edge, the images...
View ArticleGrayscale image conversion error in eclipse
I created an eclipse project according to the instructions found in [here](http://docs.opencv.org/3.0-beta/doc/tutorials/introduction/linux_eclipse/linux_eclipse.html#linux-eclipse-usage), and...
View ArticleCreate 2 channel image - grayscale and alpha
I wish to create a 2-channel png image - 1 channel would be grayscale and 1 channel would be alpha (the bit depth doesn't concern me). I have developed a workaround to achieve this, but this is...
View ArticleWhy at() return 3 values for a grayscale image
Why the grayscale image has 1 channel but still need 'Vec3b' to access the pixel value? And why there should be 3 different values. char* imageName = argv[1]; Mat image; image = imread(imageName, 1);...
View ArticleFailing to read pixel of grayscale image as float
I am trying read\write pixels of a grayscale image as floats but get an exception no matter what I do. Can someone please show me how it's suppose to be done?
View Articlegrayscale image pixel-based detect object
I would like to know if opencv allows to detect objects of grayscale image according to their pixel intensities.For example, for the same image, white pixel objects (255), black pixel objects (0) and...
View ArticleOpen CV Error: Assertion failed (scn ==2 && depth == CV_8U) in cvtColor
Hi all, I'm trying to read a 16-bit float exr image and convert it into grayscale for further image processing using **openCV in python 2.7,** however I encounter the above error "**OpenCV Error:...
View Articlewhy load an image with input 0 gives a different result that converting the...
#In Open CV with python, I wrote the following script: import numpy as np import cv2 '''Compare imread( 'detect_blob.png',0) with imread('detect_blob.png',1) and convert to gray scale''' #Method 1 img...
View Articleimage not converting to binary in simpleblob detect
How do I convert a native grey scale image to binary using simpleblob. For me, it doesn't appear so simple. My camera pulls in gray scale images named rawImage. Then a few operations are formed in...
View ArticleIs it possible to create a BGR image from predefined 3 (1-channel) image
I am trying to create 1 CV_8UC3 image from 3 different CV_8UC1 images that I already have, i.e I am trying to allocate the different single channel images that I already have into a single 1...
View ArticleHow are RGB images converted to greyscale?
Given 3 images of pure red, pure green, and pure blue, once converted to greyscale I was surprised to find they're not the same shade of grey. I suspect this is the desired behaviour and my initial...
View ArticleVideoCapture with grayscale camera
Hello I´m begginer on OpenCv I have a grayscale video camera ELP-USBFHD01M-SFV B/W, 120fps at 480 pixels with picture format MJPEG and YUY2 I need to capture an image almost at 60 FPS. One of my jobs...
View ArticleConnectedComponents-like function for grayscale image
I'm looking for help, because I wasn't successful finding a function in OpenCV that is able to perform a labelling of connected components on a grayscale image. **Input:** The input image is an image...
View ArticleHow do i convert a Grayscale video to a Tensor?
I have written a code which converts a RGB video to Grayscale and **now I want to convert it to a tensor.** I just gave `cout< #include #include using namespace cv; using namespace std; int...
View ArticleBetter character isolation
Hi, I am trying to process an image, and extract the characters from it. Please see the following link for current work in progress: http://imgur.com/a/FfqwJ At the moment, these are the steps I have...
View ArticleResult of CLAHE is different on 8 and 16 bit grayscale image
Hi, I have got a remark, problem with CLAHE algorithm on applying 8 bit and 16 bit grayscale image. I use opencv-master build. So if i applying CLAHE algorithm on 8 bit grayscale image (CV_8UC1), the...
View ArticleDifferent results between imread as grayscale and cvtColor
Did anyone notice that if you load a color image directly as gray scale, the resulting image is slightly different than loading it to a color image and then cvtColor to grayscale? Anyone know why?...
View ArticleCV_8UC3 returns grayscale
Excuse me, I'm new to opencv. I learned about CV_8UC3 that it defines an image in 8 bit unsigned integers using 3 channels (BGR). When a color image is loaded using this constant as parameter, cv::Mat...
View Article[SOLVED] putText - result is always black text
Hello, I have a Matrix of type CV_16UC1 which holds 16bit grayscale pixel data from an external camera. I want to use putText to draw WHITE text over the image. But regardless which of the following...
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