OpenCV (Open Source Computer Vision) is a cross-platform library of programming functions for real time computer vision.
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1answer
38 views
How to get more accurate results with OpenCV
I would like to ask about this function in OpenCV:
cvTermCriteria( CV_TERMCRIT_ITER | CV_TERMCRIT_EPS, 20, .3 )
How do I get more accurate results - do I need ...
0
votes
1answer
59 views
Tracking object that is missing in some frames
I am trying to track small object in videos using LK
but the problem is, some time the object does not appear in the frames !
How can I track an object that does not appear in few frames ??
how ...
0
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1answer
37 views
Image processing functions for quality control
I have to use image processing for quality control of a cookie manufacturer (as a part of my project). The program must be able to detect oversized, undersized, distorted cookies, cookies having ...
9
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2answers
100 views
Detecting a filled glass object
I've been sent here from this question in stackoverflow, please excuse me if the question comes too specific and it's not in the manners in here:)
The task is to find a glass with specific liquid in ...
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0answers
50 views
Subtracting frame from video and write it again as video [closed]
I am capturing and saving frame from video. I want to subtract the current frame from previous frame and write it again as separate video. The program below is how I tried to implement this, but its ...
1
vote
1answer
68 views
False SURF output in video
I am trying to find the three cervical vertebrae (C2 , C3 , C4)in x-ray videos (gray images)
I am using SURF to identify the place that has these 3 vertebrae (big box for all of them )
SURF gives me ...
1
vote
1answer
70 views
Image processing: using PCA for 3d object recognition
I read this lecture on using PCA/eigenfaces: http://www.cse.psu.edu/~rcollins/CSE486/lecture32.pdf
And I want to use this general procedure to recognize a 3D clay model that I took pictures of from ...
1
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3answers
75 views
Image processing, recognizing a small feature in a larger image
I am trying to write an image processing program to recognize bubbles in oil.
It has been suggested I try computing the convolution of the image and an image of a typical bubble.
i.e. : ...
4
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4answers
147 views
Detect lanes from a filtered image
I am working on lane detection system and I would like some suggestions from you as to how to detect lanes from a filtered image which I got after performing certain operations. Firstly, I should ...
1
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1answer
63 views
How can i compute perimeter and area of a skeletonized circle?
In opencv if i use findcontours function, i get contours and i can compute area, perimeter, convex hull.
if i use a Skeletonized image of a circle how can i compute perimeter,area, convex hull of the ...
1
vote
0answers
73 views
How to relocate face points in opencv / face distortion?
I have to simulate facial expressions on a face image ( say open mouth ). For this I first extracted the facial feature points and found the corners of the lips. Now I need to deform the image by ...
2
votes
1answer
106 views
Texture mapping on a 3D face from 2D face image
I have 3D points (xyz) of a face image and I have 2D face image of the same person.
The 3D points of the face are such that If I project the points to 2D plane, it matches with the 2D face image.
I ...
2
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1answer
94 views
Object-Recognition using SIFT: Switching the order of images creates two different results
I've developed a large test-system which can use every interest-point-detector and -descriptor. I use it for evaluation of the given algorithms with the standford-image-collection of cd-covers. This ...
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1answer
68 views
How to calculate Noise and distortion of an image?
I need to make an application in iphone which needs to calculate noise, geometric deformation other distortions in an image. How to do this? I have done some image processing stuff with opencv + ...
2
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0answers
95 views
Why do object-boundaries look better on a badly rectified image?(openCV stereo correspondence)
I got 2 pictures which is almost parallel, and not positioned very far from each other.
I'm using OpenCV to try to create a disparity map (Stereo correspondence).
Because I'm trying to use it in a ...
1
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0answers
50 views
Separating similiar object in an image
I have posted a question on Stackoverflow and was suggested to post here.
Please refer this question for the images: Similar Question:
I have used SURF Keypoints and a FLANN Based matcher and ...
1
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0answers
32 views
There are other shape properties scale-rotation invariant except HuMoment?
There are other shape properties scale-rotation invariant except HuMoment?
There are example that show me how can i implement them?
I find this example in c++ ...
0
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0answers
41 views
Viewing contours founded by find_contours and rotation-scale invariant regionprops in Scikit-image or OpenCV
I would like to use find_contours and regionprops of scikit-image (also opencv2 module is good) python module to extract feature from a binary image.
It's not clear how can i watch contours founded by ...
0
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0answers
66 views
OpenCV StereoRectify
If I have already computed the intrinsics(Camera matrix and distortion coefficients) in the lab.
I have then moved the cameras out in the real world field.
I used about 6-10 known locations in the ...
6
votes
3answers
98 views
Determining Toy Helicopter Orientation From Image
I am working on developing an autonomous control system for toy IR remote-controlled helicopters (like the Syma s107, for example) using a webcam and an Arduino with some IR LEDs. I am using C++ with ...
0
votes
0answers
122 views
Random Forests for Image Classification
Is there any way of using openCV Random Trees (Forests) http://docs.opencv.org/modules/ml/doc/random_trees.html for the task of image classification as described here: ...
0
votes
0answers
116 views
Using GavabDB for 3D face reconstruction from frontal image
Project: 3D face reconstruction
Input: 2D frontal face Image Output: 3D face Reconstruction and expression simulation Platform: Matlab or Opencv cpp.
I found out after study that 3D Morphable Models ...
1
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0answers
59 views
How to recognize a zebra crossing from top view using OpenCV?
How to recognize a zebra crossing from top view using OpenCV?
It is not a straight zebra crossing - it has some twists and turns.
I have some ideas:
parallel line detection, but the available ...
2
votes
1answer
96 views
Safe Point Thinning Algorithm - How to?
I am relatively new to image processing and am working on a project that requires the thinning of binary images. In the literature, I've seen references to the Safe Point Thinning Algorithm(SPTA) ...
3
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0answers
85 views
Qualitative Evaluation of Interest-Point-Detectors and Descriptors in Computer Vision
I'm writing on a qualitative evaluation study of interest-point-detectors and descriptors. I've read all Mikolajczyk papers as well as most of the surves from Datta et al. etc. Now I'm implementing an ...
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0answers
63 views
STASM or AAM which is more efficient
I am working in face detection and recognition project. I am using STASM for face detction and locating face landmarks. On googling I found AAM (Active Appearance Model) and found that it is also used ...
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0answers
92 views
Find the camera orientation from a homography
If I have a camera which is already calibrated, so that I already know distortion coefficients, and the camera matrix.
And that I have a set of points that all are in a plane, and I know the realworld ...
7
votes
3answers
654 views
Scale and Rotation invariant Template Matching
I'm looking for a method for scale and rotation invariant Template matching. I already tried some, but they didn't work so good for my examples or took for ever to execute
.
SIFT and SURF Feature ...
6
votes
0answers
411 views
Calculating a homography based on detected lines
I know you can calculate homographies from image to camera plane using correspondence points between a "perfect model" and the image points.
I'm doing it for a football pitch/field, and have used ...
1
vote
1answer
136 views
How to adjust reverse range for Hue in cvInRangeS?
cvInRangeS method for HSV colorspace is used like:
...
0
votes
0answers
30 views
Get information ouf of drawn rectangle and select label with this information out of hierarchical list
a question regarding OpenCV and getting some content information out of rectangles/ROIs,
drawn with the mouse.
My goal is, that I want to draw two rectangles (beginRect+endRect), gather some ...
4
votes
2answers
206 views
Recover myself from Dilate and Erode for noise reduction
i have obtained some skin detection map (i post below two example of detection map). but, i'm using a normal webcam and the map is noisy. Not a lot, just a bit.
I think i can remove noise only with ...
2
votes
3answers
2k views
Split and Merge image segmentation algorithm in OpenCV
I asked google and I've tried to find something in the API of OpenCV, but hadn't any good hints on split and merge image segmentation method.
I want to test it, if it's working better than my ...
11
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3answers
205 views
Slicing and Recognition of book title and author from bookshelf image
I am trying, for my own learning purposes, to develop an implementation of an algorithm that would list books, given an image of a bookshelf like the following:
The first step is to slice the image ...
3
votes
0answers
141 views
Face Detection + Cropping
Project: Face Detection
Description: I want to detect and crop a face in an image. The image is captured through webcam and only one face per image.I used OpenCV face detector, but I was not ...
5
votes
0answers
61 views
Red eye detection
Project: Red eye detection
Description: I want to remove red-eye from images. I am not able to use face detector because, the faces in the images are not always frontal and also the images are of ...
1
vote
0answers
57 views
How to categorize the images based on Illumination / shadow?
Input: Cropped face or Non Cropped face images.
Detailed explanation: My project is face authentication. I am using OpenCV face detector to crop face from images. I am using OpenCV implementation of ...
1
vote
1answer
1k views
How to determine range of HSV values of the image?
Is there any method to find range of hsv values of image (object) in rectangle inside big image? I mean, there is fixed size rectangle on my image(frame from camera) and i want to find range of hsv ...
3
votes
1answer
142 views
Binary descriptors
I'm using an algorithm to detect interest points in an image and get their descriptor. The most recent algorithms use binary strings instead of float vectors to dramatically increase the performance ...
12
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4answers
307 views
People detection from above
I am trying to find some method to detect people using only one camera 3 meters above the ground. This is a frame returned by camera:
UPDATE: Video test -> ...
1
vote
1answer
58 views
FaceAuthentication
My project is Face Authentication.
System Description: My input is only one image (which was taken when the user logins for the first time) and using that image system should authenticate whenever ...
5
votes
1answer
530 views
Differences between OpenCV Canny and MatLab Canny?
does anyone know why the MatLab Canny (MLC) is so different compared to the OpenCV Canny (OCC)?
ML-C delivers precise and more connected edges than the OCC, but how is that possible?
The reason why I ...
5
votes
2answers
388 views
Sequentially get the outer contour of an Edge Image
Hi CV/Pattern Recognition Community,
because my last thread was concerning the segmentation as BLOB and started to getting too big, with no clear results.
I would like to reconcider the last step of ...
10
votes
6answers
1k views
Image segmentation issue of different materials
Hi CV/Pattern Recognition Community,
I've got a serious problem regarding the segmentation of an image.
The scenario is an atmosphere within a furnace which makes my head go insane.
And I need to ...
0
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0answers
48 views
virtually rotating the view with intrinsic and extrinsic parameter known [duplicate]
Possible Duplicate:
How to get a top view using open cv?
I have an image taken from an angle, at a height h from ground. I have all the intrinsic and extrinsic parameters, I need to get ...
2
votes
1answer
171 views
How to get a top view using open cv?
I have a situation where i need to extract the top view of a road from the 'skewed' view I get from a cc camera located on some roadside tree. I would like to do this using OpenCV, but since I'm very ...
19
votes
5answers
579 views
Finding squares in Image
I need to find the squares in an image using OpenCV (no problem in matlab or any other, generally what i expect are some ideas).
Consider the test image below :
I need to find those coloured ...
6
votes
2answers
307 views
Pedestrian counting algorithm
Currently I am developing a pedestrian counter project (using OpenCV+QT on Linux). My idea about the approach is:
Capture Frames
Do Background Subtraction
clear noises (erode, dilate)
find blobs ...
3
votes
1answer
770 views
EmguCV: Detect a ball in the frame
I am having a VERY hard time capturing when the ball comes into frame in this video
http://www.youtube.com/watch?v=x1V6_OHrXIo
I have no idea what to set the parameters too, and trying random values ...
14
votes
1answer
542 views
Mathematics of Harris corner point detection
This is the mathematical expression for Harris corner detection:
But I have the following doubts:
What is the physical significance of $u$ and $v$? Many references say it is the magnitude by ...
