Here is a quick sketch I put together for the Arduino UNO to get the unix time from the usb serial port and sync the Arduino time to the computer (in my case macos).
This sketch works but needs more refinement (trap errors, disconnects, add options, etc) but since I will not be doing much with this for the next few weeks, I post the first working draft below and will also post the python script I use on macos soon:
I am assigned a programming work.It is my first time to use unix.
The task is writing a shell script to interrogate the university Unix operating system to determine the number of "Runnable" processes at any given time.Then append the result,along with a time-stamp,on a log file. Also there are... (1 Reply)
I have a list of interfaces and time the interface was last active. I can't figure out how to convert the time in the second column,
Fa1/14 0
Se0/0/0 0
Fa1/11 0
Fa1/9 0
Fa1/0 0
Se0/0/1 1240401408
Gi1/0 0
Fa0/0 1240401408
Fa1/3 0
Fa1/8 0
Fa1/15 0
Fa1/13 0
Fa1/10 0
Fa1/1 0
Fa1/12... (7 Replies)
Here is two time I have:
Jul 12 16:02:01
Jul 13 01:02:01
and how can I do a simple match to get difference between two time which is 09:00:00
Thanks in advance. (3 Replies)
I'd like to convert a date string in the form of sun aug 19 09:03:10 EDT 2012, to unixtime timestamp using awk.
I tried
This is how each line of the file looks like, different date and time in this format
Sun Aug 19 08:33:45 EDT 2012, user1(108.6.217.236) all: test on the 17th
... (2 Replies)
I needed some help in adding a duration (in seconds) to a start time (in hhmmss format) and a start date (in mmddyy format) in order to get an end date and end time. The concept of a leap year is also to be considered while incrementing the day. The code/ function that I have formed so far is as... (3 Replies)
Hi guys thanks for the help for my previous posts.Now i have a requirement that i download a XMl file which has UTC time stamp.I need to convert UTC time into Unix server timezone.
For ex if the time zone of unix server is CDT then i need to convert into CDT.whatever may be the system time... (5 Replies)
In my further exploration of Arduino, today I decided to install the arduino-cli on my mac today.
https://github.com/arduino/arduino-cli
I followed the instructions for macOS but when I got to this part:
arduino-cli board list
I got the dreaded "Unknown" Fully Qualified Board Name... (1 Reply)
Discussion started by: Neo
1 Replies
LEARN ABOUT DEBIAN
pfsdisplayfunction
pfsdisplayfunction(1) General Commands Manual pfsdisplayfunction(1)NAME
pfsdisplayfunction - Apply display function to color or gray-scale images
SYNOPSIS
pfsdisplayfunction [--display-function <df-spec>] [--to-pixels | --to-luminance] [--help] [--verbose]
DESCRIPTION
Use this command to convert pixel values to luminance / radiance units displayed on a monitor or to perform inverse conversion. This com-
mand is useful in combination with the HDR-VDP to convert LDR images to luminance maps representing images shown on a particular display.
The display function specification is identical to the specification used in the pfstmo_mantiuk08 tone mapping operator (from the pfstmo
package).
If neither --to-luminance nor --to-pixels option is specified, the appropriate conversion direction will be deducted from the LUMINANCE tag
in the pfs stream.
OPTIONS --to-luminance, -l
Convert pixel values to absolute luminance / radiance units. For RGB images the same display function is applied in each color chan-
nel.
--to-pixels, -p
Convert absolute luminance / radiance units to pixel values. For RGB images the same display function is applied in each color chan-
nel.
--display-function <df-spec>, -d <df-spec>
The display function describes how output luminance of a display changes with pixel values. If no parameter is given, the command
assumes -df pd=lcd (see Pre-defined display below). There are several ways to specify the display function:
Gamma-gain-black-ambient display model
g=<float>:l=<float>:b=<float>:k=<float>:a=<float>[:n=<float>]
Gamma-gain-black-ambient model can approximate a range of displays and is a compact way to specify a display function. It assumes
that a display function has the following form:
L_d(I) = (l-b)*I^gamma + b + k/pi*a
The parameters are as follows:
g - gamma or exponent of a display function (default 2.2, usually from 1.8 to 2.8)
l - peak luminance of a display in cd/m^2 (default 100, from 80 for CRTs to 500 or more for newer displays)
b - black level, which is luminance of a black pixel when the display is on (default 1, usually from 0.3 to 1 cd/m^2)
k - reflectivity of a screen (assuming that it is diffuse) (default 0.01, usually about 0.01 (1%) for LCD displays, more for CRTs)
a - ambient illumination in lux. Typical values are:
50 lux Family living room (dim, default)
400 lux
A brightly lit office
32000 lux
Sunlight on an average day (min.)
100000 lux
Sunlight on an average day (max.)
Pre-defined display
pd=<display_type>
Use pre-defined display type. This options are for convenience only and they do not mean to accurately model the response of a par-
ticular display. The following display types are recognized:
lcd_office (g=2.2, l=100, b=0.8, k=0.01, a=400 )
lcd set to "office" mode seen in bright environment
lcd (g=2.2, l=200, b=0.8, k=0.01, a=60 )
typical lcd seen in dim environment (default)
lcd_bright (g=2.6, l=500, b=0.5, k=0.01, a=10 )
newer LCD TV seen in dark environment
crt (g=2.2, l=80, b=1, k=0.02, a=60 )
CRT monitor seen in dim environment
The parameters in the parenthesis are the same as for the gamma-gain-black-ambient model explained above.
Lookup-table
lut=<file>
This is the most accurate specification of the display response function, but requires measuring it with a luminance meter. The
lookup table should account also for ambient light, so that it is recommended to use the luminance meter that can measure screen
luminance from a distance, such as Minolta LS-100 (as opposed to those that use rubber tube touching a display that eliminates the
influence of ambient light). The <file> must be a comma-separated text file in a format (CSV) with two columns: first column repre-
sents pixel values (from 0.0 to 1.0) and the second physical luminance in cd/m^2. Both the pixel value and the luminance should
increase in each raw.
EXAMPLES
pfsin barbara.jpg | pfsdisplayfunction -l -d pd:crt -v | pfsout barbara_crt.hdr
Convert barbara.jpg image from pixel values to a luminance map of the image shown on a CRT monitor and store the map as an HDR
image.
SEE ALSO pfsgamma(1)pfstmo_mantiuk08(1)BUGS
Please report bugs and comments to the pfstools discussion group (http://groups.google.com/group/pfstools).
pfsdisplayfunction(1)