barrbrain’s gists

barrbrain / analyze_ciede2000.py

Last active December 4, 2015 15:14

Color Image Quality Assessment Based on CIEDE2000, Yang Yang, Jun Ming and Nenghai Yu, 2012

	#!/usr/bin/env python3.4
	from collections import deque
	import sys
	import numpy as np
	from skimage import color
	import random
	from scipy import ndimage

	# Assuming BT.709
	yuv2rgb = np.array([

barrbrain / generate_table.py

Created November 6, 2015 08:50

Chroma quantization curve table generation for Daala

	import math

	P = 2.25

	def quant(cq): return math.trunc(math.exp((cq-6.235).10989525)16.0)

	def curve(cq): return quant(cq-math.pow(cq-1,P)/(2.0Pmath.pow(62.0,P-1)))

	print(', '.join(['0x%04X' % n for n in [0] + [curve(cq) for cq in range(1,64)]]))

barrbrain / filter.js

Last active April 9, 2016 08:13 — forked from anonymous/filter.lljs

ll.js based daala technology demos

	/*Daala video codec
	Copyright (c) 2003-2010 Daala project contributors. All rights reserved.

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions are met:

	- Redistributions of source code must retain the above copyright notice, this
	list of conditions and the following disclaimer.

	- Redistributions in binary form must reproduce the above copyright notice,

barrbrain / AV1 PVQ delta rate analysis.ipynb

Last active February 15, 2017 13:32

Simulate Daala quantization-bitrate trends for subset3

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