Detect long wavy line in image text

image-recognition

asked 2018-09-21 11:59:54 -0600

Hi,

Is it possible to detect the longest wavy line in following images and remove it. The line can be in any place of the image

I tried to apply erosion to remove those lines but for different types of font it is not working. Is it possible to to detect all long line in picture and erode that alone ?

Tried this code to predict lines but cant able to do it

inputImage = cv2.imread("input.png")
inputImageGray = cv2.cvtColor(inputImage, cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(inputImageGray,150,200,apertureSize = 3)
minLineLength = 30
maxLineGap = 5
lines = cv2.HoughLinesP(edges,cv2.HOUGH_PROBABILISTIC, np.pi/180, 30, minLineLength,maxLineGap)
for x in range(0, len(lines)):
    for x1,y1,x2,y2 in lines[x]:
        #cv2.line(inputImage,(x1,y1),(x2,y2),(0,128,0),2, cv2.LINE_AA)
        pts = np.array([[x1, y1 ], [x2 , y2]], np.int32)
        cv2.polylines(inputImage, [pts], True, (0,255,0))

font = cv2.FONT_HERSHEY_SIMPLEX
cv2.putText(inputImage,"Tracks Detected", (500, 250), font, 0.5, 255)
cv2.imshow("Trolley_Problem_Result", inputImage)
cv2.imshow('edge', edges)

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int main() { Mat img = imread("captcha1.jpg"); float phase = -0.8 * CV_PI; float omega = 2.0 * CV_PI / img.cols; float amp = 15; Mat_<Vec2f> proj(img.size()); for (int y=0; y<img.rows; y++) { for (int x=0; x<img.cols; x++) { float u = 0; // todo, i'll lleave it to you ! float v = sin(phase + float(x) * omega) * amp; proj(y,x) = Vec2f(float(x) + u, float(y) + v); } } Mat corr; cv::remap(img, corr, proj, cv::Mat(), INTER_LINEAR); imshow("in",img); imshow("out",corr); waitKey(); }

Comments

Hi, Thanks for the help. This is working fine for sin type of distortion how ever Images are coming with both sin and cos format is possible to detect which one to apply.Applying sin for cos will make the image worse

Frostyfox ( 2018-09-23 02:01:59 -0600 )edit

sin and cos are only PI/2 apart. it's simply a phase problem.

(but ofc. there's also the same kind of distortion on the x-axis (not handled here))

berak ( 2018-09-24 05:51:23 -0600 )edit

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Detect long wavy line in image text

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