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在OpenCV(或skimage)中使用投影轮廓反求方法后,将旋转图像的背景更改为白色而不是黑色_Opencv_Image Processing_Python Imaging Library_Scikit Image_Opencv Python - Fatal编程技术网

在OpenCV(或skimage)中使用投影轮廓反求方法后,将旋转图像的背景更改为白色而不是黑色

在OpenCV(或skimage)中使用投影轮廓反求方法后,将旋转图像的背景更改为白色而不是黑色,opencv,image-processing,python-imaging-library,scikit-image,opencv-python,Opencv,Image Processing,Python Imaging Library,Scikit Image,Opencv Python,我在我的二进制图像上使用了投影配置文件方法来获得deskew版本。一切都很好,但旋转后的图像有黑色区域,其中应用了倾斜如何将该区域转换为白色而不是黑色。下面是投影剖面的代码 def correct_skew(image, delta=1, limit=5): """ image : input delta : sampling in the -limit,limit + delta range limit : range o

我在我的二进制图像上使用了
投影配置文件
方法来获得deskew版本。一切都很好,但旋转后的图像有黑色区域,其中应用了倾斜如何将该区域转换为白色而不是黑色。下面是投影剖面的代码

def correct_skew(image, delta=1, limit=5):  
    """
     image : input
     delta : sampling in the -limit,limit + delta range
     limit : range of angles to explore 

    """
    # Function that returns the score of histogram for the given angle at which we check
    def determine_score(arr, angle):
        """
         arr   : binarized image
         angle : angle at which we calcuate the score
        """
        data = inter.rotate(arr, angle, reshape=False, order=0)
        histogram = np.sum(data, axis=1)
        score = np.sum((histogram[1:] - histogram[:-1]) ** 2)
        return histogram, score

    gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
    thresh = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)[1] 

    scores = []
    angles = np.arange(-limit, limit + delta, delta)
    for angle in angles:
        histogram, score = determine_score(thresh, angle)
        scores.append(score)

    best_angle = angles[scores.index(max(scores))]

    (h, w) = image.shape[:2]
    center = (w // 2, h // 2)
    M = cv2.getRotationMatrix2D(center, best_angle, 1.0)
    rotated = cv2.warpAffine(image, M, (w, h), flags=cv2.INTER_CUBIC)

    return best_angle, rotated
这是桌面扫描后的图像:

原始二进制图像:

cv2.warpaffine文档说明该函数采用可选参数,即
borderValue
。默认情况下,此值为
(0,0,0)
,您可以通过调用warpaffine例程来更改此值,如下所示:

rotated = cv2.warpAffine(image, M, (w, h), flags=cv2.INTER_CUBIC, borderMode = cv2.BORDER_CONSTANT, borderValue=np.array([255, 255, 255]))

谢谢你,巴德!工作顺利。