OpenCV deskew image

Collin Zoeller answered on June 4, 2023 Popularity 3/10 Helpfulness 1/10

answer OpenCV deskew image

OpenCV deskew image

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# Calculate skew angle of an image
def getSkewAngle(cvImage) -> float:
    # Prep image, copy, convert to gray scale, blur, and threshold
    newImage = cvImage.copy()
    gray = cv2.cvtColor(newImage, cv2.COLOR_BGR2GRAY)
    blur = cv2.GaussianBlur(gray, (9, 9), 0)
    thresh = cv2.threshold(blur, 0, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)[1]

    # Apply dilate to merge text into meaningful lines/paragraphs.
    # Use larger kernel on X axis to merge characters into single line, cancelling out any spaces.
    # But use smaller kernel on Y axis to separate between different blocks of text
    kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (30, 5))
    dilate = cv2.dilate(thresh, kernel, iterations=5)

    # Find all contours
    contours, hierarchy = cv2.findContours(dilate, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)
    contours = sorted(contours, key = cv2.contourArea, reverse = True)

    # Find largest contour and surround in min area box
    largestContour = contours[0]
    minAreaRect = cv2.minAreaRect(largestContour)

    # Determine the angle. Convert it to the value that was originally used to obtain skewed image
    angle = minAreaRect[-1]
    if angle < -45:
        angle = 90 + angle
    return -1.0 * angle

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Source: becominghuman.ai

Tags: image opencv whatever

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Contributed on Jun 04 2023

Collin Zoeller

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OpenCV deskew image

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