Slit scan videos

Core Library Questions

elena.hou..

in Core Library Questions • 2 years ago

I am a beginner to Processing but I would like to take a Quick time video of mine and turn it into a slit scan moving image.

I have seen others on YouTube and Vimeo so I am sure that it can be done, I am just not sure how.

e.g. : http://vimeo.com/13831859

I have tried many different codes like this one:

import processing.video.*; Capture C; int X=0; void setup(){ C = new Capture(this, 320,240); size(600,240); } void draw() { if(C.available()) { C.read(); copy(C, (C.width/2),0,1,C.height, (X++%width),0,1,height); }

}

However this produced a video in real time from my webcam rather than recording what it imports.

If anyone could help I would be thankful, as a beginner to writing scrips I am unsure of how to edit them and input the correct information.

Thanks

Elena

Replies(3)

fdevant

No problem
You can start with the example that comes with processing, video capture>SlitScan
then you just have to change the capture object for a movie object, import your video and voilá.

-
http://draconiansolo.wordpress.com/

elena.hou..

Re: Slit scan videos

2 years ago

Thanks - I love your optimism on my processing skills!

I have tried to edit the scrip like this:

/**

* Simple Real-Time Slit-Scan Program.

* By Golan Levin.

* This demonstration depends on the canvas height being equal

* to the video capture height. If you would prefer otherwise,

* consider using the image copy() function rather than the

* direct pixel-accessing approach I have used here.

* Created December 2006.

* Updated June 2007 by fry.

import processing.video.*;

Movie myMovie;

int draw_position_x;

boolean b_newFrame = false;

void setup(){

myMovie = new Movie(this, "laser1.mov");

myMovie.loop();

size(600, 120);

draw_position_x = width - 1;

background(0,0,0);

}

void draw() {

if (laser1.mov.available()) {

video.read();

video.loadPixels();

// Copy a column of pixels from the middle of the video

// To a location moving slowly across the canvas.

loadPixels();

for (int y = 0; y < video.height; y++){

int setPixelIndex = y*width + drawPositionX;

int getPixelIndex = y*video.width + videoSliceX;

pixels[setPixelIndex] = video.pixels[getPixelIndex];

}

updatePixels();

drawPositionX--;

// Wrap the position back to the beginning if necessary.

if (drawPositionX < 0) {

drawPositionX = width - 1;

}

I put the movie laser1.mov into the sketch folder but it states that it cannot read it.

What am I doing wrong?

Thanks again for your help!

Elena

benhalsall

Re: Slit scan videos

2 years ago

I've been playing with some slit scanning in processing. The main problem I'm coming across is that it seems to crash a lot due to memory problems. Here's the current iteration of the code I'm working with (it's a little messy):

// This is a variation on the simple Slit-Scan Program for QT Video
// Written for Processing version 123.
// Golan Levin, December 2006.
// Additions by Ben Halsall, December 2010.
//
// This demonstration depends on the canvas height being equal
// to the movie height. If you would prefer otherwise,
// consider using the image copy() function rather than the
// direct pixel-accessing approach I have used here. -- GL

// Load a movie using Processing's QT library.
import processing.video.*;
Movie myMovie;

int draw_position_x;
int video_slice_x = 0;
int twentyfive = 0;
int framenumber;
boolean b_newFrame = false; // fresh-frame flag

//--------------------------------------------
void setup(){
myMovie = new Movie(this, "0_12950.mov");
myMovie.loop();

size(200, 176);
draw_position_x = 0;

background(0,0,0);

}

//--------------------------------------------
void movieEvent(Movie m) {
m.read();
b_newFrame = true;
}

//--------------------------------------------
void draw() {
if (b_newFrame) {
    twentyfive++;
    if (twentyfive <= 5000) {
    int vWidth          = myMovie.width;
    int vHeight         = myMovie.height;

    video_slice_x = 3;

   // In particular I'm having a lot of trouble getting the code to iterate through the video! Any tips?

    /*
    if (twentyfive == 5000){
    twentyfive = 0;
    video_slice_x++;
    myMovie.jump(0);

    }
    */

    // Copy a column of pixels from the middle of the video
    // To a location moving slowly across the canvas.
    loadPixels();

    for (int y = 0; y < vHeight; y++){
      int setPixelIndex = y*width   + draw_position_x;
      int getPixelIndex = y*vWidth + video_slice_x;
      pixels[setPixelIndex] = myMovie.pixels[getPixelIndex];
    }
    updatePixels();

    // Wrap the position back to the beginning if necessary.
    draw_position_x = (draw_position_x + 1);
    if (draw_position_x >= width) {
      draw_position_x = 0;
      framenumber = twentyfive/200;
      // Saves each frame as screen-0000.tif, screen-0001.tif, etc.
      saveFrame("line-" + framenumber + "-" + video_slice_x + ".tif" );

    }
    }
    b_newFrame = false;
}
}

If anyone has any tips for working to get this to function a little more coherently then that would be much appreciated.

Ben

Slit scan videos

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