celoyd

Pansharpening notes, mid-2021

First posted in August 2021. This is basically a snapshot of my thinking about pansharpening at that time; I’m not making any substantial updates. Last typo and clarity fixes in February 2023.

Preface

This is a collection of notes on how I’ve been approaching convolutional neural networks for pansharpening. It’s an edited version of an e-mail to a friend who had asked about this tweet, so it’s informal and somewhat silly; it’s not as polished as, say, a blog post would be. It’s basically the advice I would give to an image processing hobbyist before they started working on pansharpening.

If you want a more serious introduction, start with the literature review in Learning deep multiresolution representations for pansharpening. Most of the academic work I would recommend is mentioned there.

premek

# Put this function to your .bashrc file.
# Usage: mv oldfilename
# If you call mv without the second parameter it will prompt you to edit the filename on command line.
# Original mv is called when it's called with more than one argument.
# It's useful when you want to change just a few letters in a long name.
#
# Also see:
# - imv from renameutils
# - Ctrl-W Ctrl-Y Ctrl-Y (cut last word, paste, paste)

haggen

math.randomseed(os.time())

local charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"

function string.random(length)
  if length > 0 then
    return string.random(length - 1) .. charset:sub(math.random(1, #charset), 1)
  else
    return ""
  end

stephan-nordnes-eriksen

For a project I am on I need to use a key-value store to converts file-paths to fixnum IDs. The dataset will typically be in the range of 100 000 to 1 000 000. These tests use 305 000 file paths to fixnum IDs.

The Different Key-Value stores tested are:

Daybreak: "Daybreak is a simple and very fast key value store for ruby" GDBM: GNU dbm. "a simple database engine for storing key-value pairs on disk." DBM: "The DBM class provides a wrapper to a Unix-style dbm or Database Manager library" PStore: "PStore implements a file based persistence mechanism based on a Hash. "

Out of these, all except Daybreak are in the Ruby standard library.

perky

--[[
	ProFi v1.3, by Luke Perkin 2012. MIT Licence http://www.opensource.org/licenses/mit-license.php.
	
	Example:
		ProFi = require 'ProFi'
		ProFi:start()
		some_function()
		another_function()
		coroutine.resume( some_coroutine )
		ProFi:stop()

nimaai

Macro pitfalls

Summary of and excerpts from chapter 9 and 10 of On Lisp. Examples are mainly in Common Lisp.

• [Variable capture] (https://gist.github.com/nimaai/2f98cc421c9a51930e16#variable-capture)
• [Macro argument capture] (https://gist.github.com/nimaai/2f98cc421c9a51930e16#macro-argument-capture)
• [Free symbol capture] (https://gist.github.com/nimaai/2f98cc421c9a51930e16#free-symbol-capture)
• [Multiple evaluation] (https://gist.github.com/nimaai/2f98cc421c9a51930e16#multiple-evaluation)
• [Order of evaluation] (https://gist.github.com/nimaai/2f98cc421c9a51930e16#order-of-evaluation)

bitingsock

local api = "wasapi"
local deviceList = mp.get_property_native("audio-device-list")
local aid = 1
local function cycle_adevice(s, e, d)
    mp.enable_messages("error")
    while s ~= e + d do -- until the loop would cycle back to the number we started on
        if string.find(mp.get_property("audio-device"), deviceList[s].name, 1, true) then
            while true do
                if s + d == 0 then       --the device list starts at 1; 0 means we iterated to far
                    s = #deviceList + 1  --so lets restart at the last device

defunkt

#!/usr/bin/env ruby
# Usage: gitio URL [CODE]
#
# Turns a github.com URL
#  into a git.io URL
#
# Copies the git.io URL to your clipboard.

url  = ARGV[0]
code = ARGV[1]

marklkelly

#Simplified for illustrative purposes.
events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;

LinuxJedi

define ddl
    set $log = ngx_cycle->log

    while ($log != 0) && ($log->writer != ngx_log_memory_writer)
        set $log = $log->next
    end

    if ($log->wdata != 0)
    	set $buf = (ngx_log_memory_buf_t *) $log->wdata
    	dump memory debug_log.txt $buf->start $buf->end