在python3的scipy ndimage模块提供了一个名为percentile_filter()的函数,它是中值滤波器的一个通用版本。 in range(25, 100, 25): for k in range(5, 25, 5): pylab.subplot(3, 4, i) filtered = ndimage.percentile_filter
import numpy as np from PIL import Image import scipy.ndimage as ndimage img = Image.open('the_starry_night.jpg import scipy.ndimage as ndimage 最后我们看一眼原图。 高斯模糊 redGaussian = ndimage.gaussian_filter(red, sigma=1.5) greenGaussian = ndimage.gaussian_filter(green (red, size=15) greenBox = ndimage.uniform_filter(green, size=15) blueBox = ndimage.uniform_filter(blue (red, size=15) greenMedian = ndimage.median_filter(green, size=15) blueMedian = ndimage.median_filter
from frame import * import scipy.ndimage as ndimage generate('lena.png', 'black_tophat.png', ndimage.black_tophat from frame import * import scipy.ndimage as ndimage def func(*args): return ndimage.white_tophat from frame import * import scipy.ndimage as ndimage def func(*args): return ndimage.prewitt(args from frame import * import scipy.ndimage as ndimage def func(*args): return ndimage.rank_filter( from frame import * import scipy.ndimage as ndimage def func(*args): return ndimage.sobel(args[0
下面的代码则演示了scipy库中ndimage模块对图像进行中值滤波的用法: >>> from scipy import misc >>> from scipy import ndimage >>> import >>> median_face = ndimage.median_filter(face, 7) #中值滤波 >>> plt.imshow(median_face) >>> plt.show() ? >>> median_face = ndimage.median_filter(face, 3) #缩小邻域为3 >>> plt.imshow(median_face) >>> plt.show()
载入图片 import numpy as np import PIL.Image as Image import scipy.ndimage as ndimage data = np.array(Image.open ('the_starry_night.jpg')) 左旋转30度,且重新调整图片大小 left30 = ndimage.rotate(data, 30) Image.fromarray(left30) .save('left30.png') 右旋转30度,且重新调整图片大小 right30 = ndimage.rotate(data, -30) Image.fromarray(right30).save ('right30.png') 左旋转135度,保持图片大小不变 注意我们给reshape参数传递了False,即不调整图片大小 left135 = ndimage.rotate(data, 135, reshape=False) Image.fromarray(left135).save('left135.png') 右旋转135度,保持图片大小不变 right135 = ndimage.rotate
下面测试九点平滑下的台风流线图与scipy的滤波结果进行对比 核心函数:scipy.ndimage.gaussian_filter scipy.ndimage.median_filter 九点平滑 In ` namespace, the `scipy.ndimage.filters` namespace is deprecated. DeprecationWarning: Please use `median_filter` from the `scipy.ndimage` namespace, the `scipy.ndimage.filters ` namespace, the `scipy.ndimage.filters` namespace is deprecated. DeprecationWarning: Please use `median_filter` from the `scipy.ndimage` namespace, the `scipy.ndimage.filters
>>> import numpy as np >>> from scipy import ndimage >>> import matplotlib.pyplot as plt >>> square = >>> open_square = ndimage.binary_opening(square) #开运算 >>> plt.imshow(open_square) #开运算结果 >>> plt.show >>> closed_square = ndimage.binary_closing(square) #闭运算 >>> plt.imshow(closed_square) #显示闭运算结果 >>> >>> eroded_square = ndimage.binary_erosion(square) #腐蚀运算 >>> plt.imshow(eroded_square) >>> plt.show() >>> dilation_square = ndimage.binary_dilation(square) #膨胀运算 >>> plt.imshow(dilation_square) >>> plt.show
这里有两个版本的泛洪填充算法: 第一个,更简单的一个包含两个未定义的变量,但这是一个工作版本: import numpy as np import scipy as sp import scipy.ndimage def flood_fill(test_array,h_max=255): input_array = np.copy(test_array) el = sp.ndimage.generate_binary_structure (2,2).astype(np.int) inside_mask = sp.ndimage.binary_erosion(~np.isnan(input_array), structure=el) output_array output_array[inside_mask]=h_max output_old_array = np.copy(input_array) output_old_array.fill(0) el = sp.ndimage.generate_binary_structure output_old_array, output_array): output_old_array = np.copy(output_array) output_array = np.maximum(input_array,sp.ndimage.grey_erosion
我们将使用 scipy.ndimage 模块中的 imread 函数和 Matplotlib 进行图像的读取和显示。 import numpy as np import matplotlib.pyplot as plt from scipy import ndimage # 读取图像 image_path = 'path /to/your/image.jpg' # 替换为实际图像路径 image = ndimage.imread(image_path, mode='RGB') # 显示图像 plt.imshow(image 这里使用了 ndimage.imread 函数读取图像,然后通过 Matplotlib 的 imshow 函数进行显示。 2. from scipy.ndimage import gaussian_filter from scipy.ndimage import sobel # 对灰度图进行高斯平滑 smoothed_image
代码 import numpy as np from PIL import Image import scipy.ndimage as ndimage source = np.array(Image.open constant', 'grid-constant', 'nearest', 'mirror', 'grid-wrap', 'wrap'] for mode in modeList: target = ndimage.shift mode) Image.fromarray(target).save('shift_' + mode + '.png') 或见https://github.com/f304646673/scipy-ndimage-example
先把要使用的module导入进来 # coding:utf-8 - * - import scipy from scipy import ndimage from scipy import misc import numpy as np SciPy中图像处理的方法主要在misc和ndimage这两个子模块下面 先来看一张德普的帅照("depu.jpg"),然后接下来我们对他做各种处理, 看看会是什么样子。 ## ndimage ## # 滤波, Filters ndimage是一个多维图像处理的库,包括滤波,插值,傅里叶滤波,图像形态学,以及对图片的特征统计方法。 depu = ndimage.imread("depu_1.jpg") print depu.shape # (1024L, 1280L, 3L) sigma_list = [5, 10, 20] for # 傅里叶滤波, Fourier filters fourier_gaussian(input, sigma, n=-1, axis=-1, output=None) from scipy.ndimage
先看下原图 import numpy as np from PIL import Image import scipy.ndimage as ndimage img = Image.open('lena.png img03 = ndimage.zoom(data, zoom=(0.3, 0.3, 1)) Image.fromarray(img03).save('zoom03.png') 放大 下面的代码是对第一 img15 = ndimage.zoom(data, zoom=(1.5, 1.5, 1)) Image.fromarray(img15).save('zoom15.png') 代码地址 https:/ /github.com/f304646673/scipy-ndimage-example/tree/main/zoom
十一、图像处理:scipy.ndimagescipy中致力于图像处理的子模块是scipy,ndimage。 In [49]: from scipy import ndimage图像处理程序可以根据它们执行的操作类别来分类。 = ndimage.rotate(lena, 30)In [55]: cropped_lena = lena[50:-50, 50:-50]In [56]: zoomed_lena = ndimage.zoom (noisy_lena, sigma=3)In [82]: median_lena = ndimage.median_filter(blurred_lena, size=5)In [83]: from (mask)In [154]: closed_mask = ndimage.binary_closing(opened_mask)----练习: 验证重构区域比初始区域更小。
Scipy有用来做滤波操作的scipy.ndimage.filters模块。该模块使用快速一维分离的方式来计算卷积。 使用方式: from PIL import Image import numpy as np from scipy.ndimage import filters img = Image.open 如果是打算模糊一幅彩色图像,只需要简单地对每一个颜色通道进行高斯模糊: from PIL import Image import numpy as np from scipy.ndimage import 模块地标准卷积操作来简单地实现 from PIL import Image import numpy as np from scipy.ndimage import filters img = 以下给出使用样例: from PIL import Image import matplotlib.pyplot as plt import numpy as np from scipy.ndimage
import numpy as np from PIL import Image import matplotlib.pyplot as plt from scipy import ndimage avg_img=np.array(avg_img).mean(axis=0).reshape(cov_len, cov_len) avg_img=avg_img/avg_img.sum()#加权平均值 i=ndimage.convolve
数组统计函数 ndimage提供一系列函数,可以计算标注后的数组的相关特征,比如最值、均值、均方根等。 示例如下 import numpy as np import scipy.ndimage as sn x = np.random.randint(10, size=(3,3)) print(x) '' 1.088235294117647) sn.extrema(x) # (0, 9, (0, 0), (1, 0)) 连通域标记 通过label函数,可以对数组中的连通区域进行标注,效果如下 from scipy.ndimage
from PCV.geometry import warp,homography from PIL import Image from pylab import * from scipy import ndimage 1,1,1,1]])#角点坐标 #计算仿射变换并将其应用于图像 H=homography.Haffine_from_points(tp,fp)#单应性矩阵(3*3) im1_t=ndimage.affine_transform
numpy as np import matplotlib.pyplot as plt from random import choice import scipy import scipy.ndimage Sobel 过滤器的边界检测 # Sobel 过滤器用于提取图像的边界 # 也就是将图像转换成线框图风格 import scipy import scipy.ndimage import matplotlib.pyplot plt.imshow(lena) plt.title('Original') plt.axis('off') # Sobel X 过滤器过滤后的图像(右上方) sobelx = scipy.ndimage.sobel plt.imshow(sobelx) plt.title('Sobel X') plt.axis('off') # Sobel Y 过滤器过滤的图像(左下方) sobely = scipy.ndimage.sobel 223) plt.imshow(sobely) plt.title('Sobel Y') plt.axis('off') # 默认的 Sobel 过滤器(右下方) default = scipy.ndimage.sobel
特别是子模块scipy.ndimage提供了操作n维Numpy数组的函数。 资源 scipy.ndimage的完整函数列表:https://docs.scipy.org/doc/scipy/reference/tutorial/ndimage.html#correlation-and-convolution 示例 SciPy高斯过滤: from scipy import misc,ndimage face = misc.face() blurred_face = ndimage.gaussian_filter (face, sigma=3) very_blurred = ndimage.gaussian_filter(face, sigma=5) #Results plt.imshow(<image to
binary # pixel to the nearest zero pixel, then find peaks in this # distance map D = ndimage.distance_transform_edt on the local peaks, # using 8-connectivity, then appy the Watershed algorithm markers = ndimage.label