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图像滤波

卷积和相关性、预定义和自定义滤波器、非线性滤波、边缘保持滤波器

滤波是一种用于修正或增强图像的技术。例如，您可以对图像进行滤波以强调某些特征或删除其他特征。用滤波实现的图像处理运算包括平滑、锐化和边缘增强。

App

图像区域分析器Browse and filter connected components in an image

函数

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imfilter多维图像的 N 维滤波
roifilt2Filter region of interest (ROI) in grayscale image
nlfilterGeneral sliding-neighborhood operations
imgaussfilt图像的二维高斯滤波
imgaussfilt3三维图像的三维高斯滤波
wiener2二维自适应去噪滤波
medfilt2二维中位数滤波
medfilt3三维中位数滤波
modefilt2-D and 3-D mode filtering （自 R2020a 起）
ordfilt2二维顺序统计量滤波
stdfiltLocal standard deviation of image
rangefiltLocal range of image
entropyfiltLocal entropy of grayscale image
imboxfilt2-D box filtering of images
imboxfilt33-D box filtering of 3-D images
fibermetricEnhance elongated or tubular structures in image using Frangi vesselness filter
maxhessiannormMaximum of Frobenius norm of Hessian of matrix
padarray填充数组
imbilatfiltBilateral filtering of images with Gaussian kernels
imdiffuseestEstimate parameters for anisotropic diffusion filtering
imdiffusefiltAnisotropic diffusion filtering of images
imguidedfilterGuided filtering of images
imnlmfiltNon-local means filtering of image
burstinterpolantCreate high-resolution image from set of low-resolution burst mode images （自 R2019a 起）
gaborCreate Gabor filter or Gabor filter bank
imgaborfilt将 Gabor 滤波器或滤波器组应用于二维图像
bwareafilt按大小从二值图像中提取对象
bwpropfiltExtract objects from binary image using properties
integralImageCalculate 2-D integral image
integralImage3Calculate 3-D integral image
integralBoxFilter2-D box filtering of integral images
integralBoxFilter33-D box filtering of 3-D integral images
fspecial创建预定义的二维滤波器
fspecial3Create predefined 3-D filter
convmtx22-D convolution matrix
freqz22-D frequency response
fsamp22-D FIR filter using frequency sampling
ftrans22-D FIR filter using frequency transformation
fwind12-D FIR filter using 1-D window method
fwind22-D FIR filter using 2-D window method
freqspace频率响应的频率间距

主题

空间域中的图像滤波快速入门

去噪滤波

  • 去除噪声
    使用平均值滤波、中位数滤波和基于图像局部方差的自适应滤波等方法来去除图像噪声。
  • 将高斯平滑滤波器应用于图像
    通过使用不同强度的各向同性和各向异性高斯平滑滤波器模糊图像来降低图像噪声。
  • Reduce Noise in Image Gradients
    Reduce noise associated with computing image gradients so that features can be more accurately detected.

边缘保持滤波

积分图像域滤波

  • Integral Image
    Integral images are a quick way to represent images for filtering. In an integral image, the value of each pixel is the summation of the pixels above and to the left of it.
  • Apply Multiple Filters to Integral Image
    Smooth an image by different amounts by applying box filters of varying sizes to the integral image.

频域滤波