File:Illusion movie.ogv
From HandWiki
Illusion_movie.ogv (file size: 6.29 MB, MIME type: application/ogg)
This file is from a shared repository and may be used by other projects. The description on its file description page there is shown below.
Summary
DescriptionIllusion movie.ogv |
English: To see the illusion, do this:
Play the movie (which lasts 1 minute) full screen and stare to the center of the image. After the movie finishes, look away (for example look to a face or to your hands). For few seconds everything you see will appear to distort. The original idea is not mine, I have seen on the net, BUT this animation file was created by me with this C program.Türkçe: İllüzyonu görebilmek için, videoyu tam ekranda oynatın ve şeklin merkezine odaklanın. Video bittiğinde farklı bir noktaya ( elinize ya da yüzünüze) bakın. Bir kaç saniye boyunca baktığınız her şey bozulmuş gibi görünecek. |
Date | |
Source | Own work by the original uploader |
Author | Paulnasca at English Wikipedia |
Source code InfoField | //License: Public Domain
//Written by Nasca Octavian PAUL, Tg. Mures, Romania
//in 20060901
/*
Steps to obtain the illusion image:
1) Compile this program and run it
2) Convert the .pgm images to .png images with the bash script:
>>>>>cut<<<<<
for file in *.pgm
do
echo $file
pnmtopng $file > "$file.png"
rm -f $file
done
>>>>>cut<<<<<
3) Convert png images to "output.avi"
mencoder "mf://*.png" -mf fps=20:type=png -ovc lavc -oac copy -o output.avi
4) Convert "output.avi" to ogg theora with:
ffmpeg2theora output.avi
5) Run the animation (full screen) and look and stare in the center of it
After 1 minute, look away and you'll see a very interesting illusion (looks like objects/faces/etc changes their shapes) which last few seconds.
*/
#include <stdio.h>
#include <math.h>
static const int sizex=640;
static const int sizey=480;
static const float freq=80;
static unsigned char data[sizex*sizey];
static unsigned char f(float x,float y,float phase){
x=fabs(x);
y=fabs(y);
float m=sin(phase+(x+y)*freq)*127.0+128;
return (m);
}
static void make_frame(float t){
for (int j=0;j<sizey;j++){
for (int i=0;i<sizex;i++){
float x=(i*2-sizex)/(float)sizex;
float y=(j*2-sizey)/(float)sizey;
float y2=y/sizex*sizey;
if ((x*x+y2*y2)<0.1) data[i+j*sizex]=f(x,y,t);
else data[i+j*sizex]=f(x,y,-t);
}
}
}
static void save_frame(char *filename) {
FILE *f=fopen(filename,"wb");
if (!f) return;
fprintf(f,"P5\n%d %d\n255\n\n",sizex,sizey);
fwrite(data,sizex,sizey,f);
fclose(f);
}
int main(void) {
char tmp[100];tmp[99]=0;
for (int k=0;k<1200;k++){
make_frame(k*0.5);
snprintf(tmp,99,"frame%05d.pgm",k);
printf("%s\n",tmp);
save_frame(tmp);
}
return 0;
}
|
Licensing
Public domainPublic domainfalsefalse |
This work has been released into the public domain by its author, Paulnasca at English Wikipedia. This applies worldwide. In some countries this may not be legally possible; if so: Paulnasca grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.Public domainPublic domainfalsefalse |
Original upload log
The original description page was here. All following user names refer to en.wikipedia.
- 2006-09-01 18:27 Paulnasca 640×480× (6598414 bytes) To see the illusion, do this: Play the movie (which last 1 minute) full screen and stare to the center of the image. After the movie finishes, look away (for example look to a face or to your hands). For few seconds everything you'll see appear to distor
Items portrayed in this file
depicts
1 September 2006
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Dimensions | User | Comment | |
---|---|---|---|---|
current | 01:03, 27 December 2017 | (6.29 MB) | imagescommonswiki>Tikmok | User created page with UploadWizard |
File usage
The following file is a duplicate of this file (more details):
- File:Illusion movie.ogv from Wikimedia Commons
The following page uses this file:
Retrieved from "https://handwiki.org/wiki/File:Illusion_movie.ogv"