william-silversmith

def countless(data):
  """
  Vectorized implementation of downsampling a 2D 
  image by 2 on each side using the COUNTLESS algorithm.
  
  data is a 2D numpy array with even dimensions.
  """
  # allows us to prevent losing 1/2 a bit of information 
  # at the top end by using a bigger type. Without this 255 is handled incorrectly.
  data, upgraded = upgrade_type(data) 

william-silversmith

def zero_corrected_countless(data):
  """
  Vectorized implementation of downsampling a 2D 
  image by 2 on each side using the COUNTLESS algorithm.
  
  data is a 2D numpy array with even dimensions.
  """
  # allows us to prevent losing 1/2 a bit of information 
  # at the top end by using a bigger type. Without this 255 is handled incorrectly.
  data, upgraded = upgrade_type(data) 

william-silversmith

import numpy as np

def simplest_countless(data):
  """
  Vectorized implementation of downsampling a 2D 
  image by 2 on each side using the COUNTLESS algorithm.
  
  data is a 2D numpy array with even dimensions.
  """
  sections = []

william-silversmith

# get bcmatch from http://www.fmwconcepts.com/imagemagick/bcmatch/index.php
if [ ! -e frames_adj ]; then
	echo "adjusting for brightness/contrast"
	mkdir frames_adj

	for fname in `ls frames`; do
		./bcmatch frames/07.png frames/$fname frames_adj/$fname
	done
fi

william-silversmith

FILENAME=$1
FPS=${2:-24}
SPEEDUP=${3:-100}

echo "FILENAME: $FILENAME, FPS: $FPS, RATE: $SPEEDUP%"

mkdir -p frames
touch frames/tmp.txt # make rm not fail if frames is empty
rm frames/*
ffmpeg -threads 0 -i "$FILENAME" -vf scale=700:-1:flags=lanczos,fps=$FPS frames/ffout%03d.png

william-silversmith

PI = 3.14159265359

exp(x)
  return math(x, 'exp')
  
sqrt(x)
  return math(x, 'sqrt')  

atan(x)

william-silversmith

// Note: I found out stylus has math(x, 'sqrt') after the fact

sqrt(y)
  if y < 0
    error("Unable to process complex roots.")
  
  if y == 0 // for floating point precision
    return 0
  else if y == 1 // for floating point precision
    return 1

william-silversmith

/* easeOutFactory
 *
 * Generate an ease-out function with desired steepness.
 * Article: https://medium.com/analytic-animations/ease-out-the-half-sigmoid-7240df433d98#.yupto8l43
 *
 * Note: Values below 6 may not come to a smooth stop.
 *
 * Required:
 *   k: (float), sharpness of ease
 *   

william-silversmith

// Volume needs to lease the data cube
class Volume {
	constructor (args) {
		this.channel_id = args.channel_id; // volume id as corresponding to the data server
		this.segmentation_id = args.segmentation_id; 

		this.bounds = args.bounds;

william-silversmith

/* springFactory
 *
 * Generate a physically realistic easing curve for a damped mass-spring system.
 *
 * Required:
 *   damping (zeta): [0, 1)
 *   halfcycles: 0...inf
 *
 * Optional:
 *   initial_position: -1..1, default 1