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
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()
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
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
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
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
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
import numpy as np import matplotlib.pyplot as plt from random import choice import scipy import scipy.ndimage ) 此函数应用高斯过滤器 random_integers() 此函数返回一个数组,数组中的随机整数值在上限和下限之间 polar() 该函数使用极坐标绘制图形 另见 可以在这个页面中找到scipy.ndimage 操作步骤 在本部分中,您将学习如何应用 Sobel 过滤器来检测 Lena 图像中的边界: 要在 x 方向上应用 Sobel 过滤器,请将轴参数设置为0: sobelx = scipy.ndimage.sobel (lena, axis=0, mode='constant') 要在 y 方向上应用 Sobel 过滤器,请将轴参数设置为1: sobely = scipy.ndimage.sobel(lena, axis =1, mode='constant') 默认的 Sobel 过滤器仅需要输入数组: default = scipy.ndimage.sobel(lena) 是原始图像图和所得图像图,显示了使用 Sobel
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(r"girl.jpg 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 = Image.open 以下给出使用样例: from PIL import Image import matplotlib.pyplot as plt import numpy as np from scipy.ndimage