How to run the calc_log_hist.m and visualize_hist.m?

[iamsiddhantsahu]

I am trying to understand the "Convolutional Color Constancy" paper. Can you please comment and explain how is the log chroma histogram built and how to actually visualize it?
In the visualize_hist.m function, what is the input X and rho?
I only want to visualize the 2D log chroma histogram.

[iamsiddhantsahu]

Why is
uv_0 = -1.421875;
in calc_log_hist.m ?

[iamsiddhantsahu]

In calc_log_hist.m what does function N = Psplat2(u, v, c, bin_lo, bin_step, n_bins) function does?
Also in visualize_hist.m what does if ~exist('rho', 'var') rho = 0.5; end signify?

[yuanxy92]

Hi this project is based on ffcc
Fast Fourier Color Constancy, uv_0 is the initial value

the matlab code is almost based on https://github.com/google/ffcc
and what i do is implementing it using c++/cuda

[iamsiddhantsahu]

Yes I know that. But please tell me why is the initial value of uv_0 = -1.421875?

[yuanxy92]

This value is copied from the ffcc code.
How to choose the initial value is in the ffcc paper.