w112348的博客

1 适用于灰度图像或者三通道图像的降采样 def downsampling(img, k): """ Down-sample an image of shape (h, w) into an image of shape(h/k, w/k), by averaging every k*k elements. img: an image of 2D or 3D k: edge length of the kernel Can apply t

查看照片信息： dcraw -i -v [image] color options -w: use the white balance specified by camera -o 1: specify output color space as sRGB interpolation options -q 3: interpolation with highest quality -d/D/E: no interpolation output options -4: linear 16 bit -T: w

Outline Light sources. Some notes about radiometry. Photometric stereo. Uncalibrated photometric stereo. Generalized bas-relief ambiguity. Light sources some useful lighting models plenoptic function (function on 5D domain) L(x,ω)L(x, \omega)L(x,ω)

Outline The coded photography paradigm Dealing with depth blur coded aperture focal sweep generalized optics Dealing with motion blur coded exposure parabolic sweep Dealing with depth blur The coded photography paradigm Coded aperture Aperture

Outline Sources of blur Deconvolution Blind deconvolution Why are our images blurry? Lens imperfections aberration chromatic aberration diffraction 衍射 Camera shake Scene motion Depth defocus Point spread function (PSF): The blur kernel of a lens

Outline Color and human color perception Retinal color space Color matching Linear color space Chromaticity Color calibration Non-linear color space Color and human color perception Illuminant spectral power distribution: abbr SPD Spectral reflectance

Outline Focal stack. Confocal stereo. Lightfield. Measuring lightfields. Plenoptic camera. Focal Stack capture images focused at multiple planes, and merge them into a single all in-focus image analogous to what we did in HDR, focal stack instead of expo

Outline Sensor noise. Noise calibration. Optimal weights for HDR Sensor Noise Note: we will only consider per-pixel noise. We won’t consider cross-pixel effects such as blooming , smearing, cross-talk… Where does the noise come from Poisson distributio

Exposure and high dynamic range imaging Overview Exposure control. Light metering. Our devices do not match the world. High dynamic range imaging. Radiometric calibration. Other aspects of HDR imaging. Tonemapping. Exposure control Exposure=Gain×Irradian