A. I. P 郭瓊蓮 柯瑋明 吳榮軒 Term Project

Implement this paper : “Two-scale Tone Management for photographic Look,” Bae, Paris, and Durand. Apply the method to different kind of pictures. Add HDR technique. Subject Review

Algorithm Review model input base detail bilateral filter high pass and local averaging textureness transfer large-scale transfer

Algorithm Review modified base modified detail final output constrained combination postprocess black-and-white output

Our works Our input Our model

Our works Our detail Our base

Our works With edge preserving Without edge preserving

Our works Our result Author’s result

HDR

Uncertainty. Poisson equation. Histogram matching. Textureness. Color channel. Problems

An old problem while using fast bilateral filter. Uncertainty

Cost most time in our pipeline. Use Discrete Sine Transform to reduce time complexity. Easy to implement. Poisson

General Poisson Equation: –I xx + I yy = f For discrete version, we can rewrite the equation to matrix form: –TI + IT = F,where T is a N*N triagonal matrix of {1,-2,1}. Poisson

We define Poisson

DX+XD=B is easy to solve Then we use I=SXS to get final answer. Poisson

In fact, SXS performs 2-D DST on X Implementation steps: –Perform 2-D DST on F –Divide the sum of the corresponding eigenvalue and a constant. –Perform 2-D DST again Poisson

The gray-value in log domain are always negative or zero. The range could be even wider if HDR added. The function implemented by MATLAB can only handle the interval from 0 to 1…… Hist-matching

Input distribution histogram

Hist-matching Mask distribution histogram

Hist-matching Output distribution histogram

Hist-matching Input Output Mask

Textureness ρ p = max( 0, ( T’ p – T(B’) p ) / T(D) p ) T( I ) p = 1/k * ∑ gσ s ( |p – q| ) gσ r ( |I p - I q | )|H| q q ∈ |H| k = ∑ gσ s ( |p – q| ) gσ r ( |I p - I q | ) q ∈ I O = B’ + ρ D H is the high-pass version of the image.

Textureness Input

Textureness High frequency of H

Textureness Absolute value of H

Textureness T

0+

Which color channel could work best? –RGB channel. Process separately. Process intensity only and then interpolate the three channel. –YUV channel. Color Channel

More Images InputModel

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More Images Input Model

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More Images Input Model

More Images Input Output

More Images Input Model

More Images Input Output

Questions Thanks for your attention.