2017-05-11 04:19:52 -0500 commented question How can i get detail implementation behind houghCircles method? @berak Thank you so much.. 2017-05-11 02:38:56 -0500 asked a question How can i get detail implementation behind houghCircles method? As i am struggling to fine tune HoughCircles for my application, i want to see method code which opencv is using for circle detection. Quality of detecting circle for good image also very bad. I want to check how circles are sorted. Kindly do the needful or provide some reference. 2017-01-18 23:12:15 -0500 asked a question How to find correct Region of interest for different dpi images? I am developing commercial software for reading images and finding region of interest by passing top left corner coordinates and bottom right coordinates of rectangle then crop the image.Some client provides samples like 100 dpi, 200 dpi or 400 dpi images of same image. Because these kind of images, my coordinates lie somewhere else. How can i fix a problem to find actual area of interest for different dpi of images and find exact ROI? Give some rough idea to solve it. first = [1025,1000] last = [1550,1400] image = cv2.imread("db/SGBAU/pink OMR/200.jpg") def ROI_extract(first_corner,last_corner,image): #croping ROI ROI_img = image[first_corner[1]:last_corner[1],first_corner[0]:last_corner[0]] cv2.imwrite(os.path.join('db/','ROI.png'), ROI_img) return ROI_img  2017-01-02 06:31:25 -0500 commented answer How to detect marked black regions inside largest Rectangle Contour? in this code i am not getting how are you generating result image where alphabets are printed on filled circle. after that how are you decoding alphabets in single string? 2016-12-29 01:26:20 -0500 commented answer how to find angle from x y points? yeah..i solved this issue.Thank you very much. pnts = np.array(points) rect = cv2.minAreaRect(pnts) box = cv2.cv.BoxPoints(rect) box1 = np.int0(box) cv2.drawContours(resized,[box1],0,(0,255,0),2) 2016-12-29 01:25:48 -0500 received badge ● Scholar (source) 2016-12-29 00:12:05 -0500 commented answer how to find angle from x y points? rect = cv2.minAreaRect(points) box = cv2.cv.BoxPoints(rect) box = np.int0(box) cv2.drawContours(img,[box],0,(0,0,255),2) i have written like this but error is coming like TypeError: points is not a numpy array, neither a scalar 2016-12-28 23:35:03 -0500 commented answer how to find angle from x y points? i have to first save this center points of rectangle in one variable then i can pass that variable inside minAreaRect. Is it r8? 2016-12-28 07:32:11 -0500 asked a question how to find angle from x y points? I have image which contain 12 center point of rectangle. I am not getting how to code for image rotation from that point.C:\fakepath\deskew.png.Please help me with some code in opencv and python 2016-12-27 00:25:17 -0500 received badge ● Enthusiast 2016-12-26 00:25:03 -0500 commented answer How to detect marked black regions inside largest Rectangle Contour? i am going to make software which can detect image and check image alignment and make it proper. Is we require reference image? what will be the case if reference image is also not in correct position? I want to clear the concept of image alignment? 2016-12-26 00:21:38 -0500 commented answer How to detect marked black regions inside largest Rectangle Contour? @essamzaky Is hough transform give best result for deskew of image? 2016-12-23 00:35:07 -0500 received badge ● Editor (source) 2016-12-23 00:34:43 -0500 commented answer Deskew of image and ROI detection @pi-null-mezon thank you for the solution.i will try and let you know how it working 2016-12-22 00:27:21 -0500 asked a question Deskew of image and ROI detection In OMR, if scanned OMR is not in correct position then how can i deskew the image and search exact location of roll number rectangle?i want to extract information from different rectangle based on bubble selection. i need help to sort out this problem. 2016-12-21 06:52:35 -0500 commented answer how to print detected marked circle in OMR sheet? i need solution in python itself. in my case after detecting black circle it will be evaluated as candidate roll number. so code will print roll number. i am facing problem to decoding circle as it is image. i am very new in this domain. Please help me out 2016-12-21 06:49:25 -0500 commented answer How to detect marked black regions inside largest Rectangle Contour? Can i get this code in python with open cv? i am not able to understand it.. 2016-12-21 05:42:56 -0500 answered a question How to detect marked black regions inside largest Rectangle Contour? i want solution in python as m not good in java 2016-12-20 00:41:12 -0500 asked a question how to print detected marked circle in OMR sheet? I am working on OMR and i am detecting circle who are selected by student. Now i am not getting how to get the selected numbered circle which marked by student.I am looking solution/idea for opencv 2.3.12 and python C:\fakepath\circlesample1.png