i wanted to explore slitscan as it affected multicordes videos. i find the jitter on the visual lines of the cordes to be ideal for showing the action of the slitscan.
i developed a “short multicordes” apparatus specifically for this video (gymnastics ring with hitched nautical sash cordes (properly whipped ends this time)) as i had extra material lying around from original development.
![](http://www.errorbesque.com/blog/wp-content/uploads/2023/09/image-803x1024.png)
extremely simple python code in a local notebook below
import sys
# !{sys.executable} -m pip install numpy
!{sys.executable} -m pip install opencv-python
import numpy as np
import cv2
cap = cv2.VideoCapture('toeclimbspin4.mov')
saveline=[]
first=1
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
offset = height-700 # bottom
offset2 = 420 # top
# slitscan in 2 directions
while(cap.isOpened()):
ret, frame = cap.read()
if (first==1):
savesection = frame[offset:height,0:width]
savesection2 = frame[0:offset2, 0:width]
first=0
else:
for j in range(height-offset-1,0,-1):
savesection[j,:] = savesection[j-1,:]
for j in range(0-1,offset2,1):
savesection2[j-1,:] = savesection2[j,:]
savesection[0] = frame[offset,0:width]
savesection2[0] = frame[offset2,0:width]
frame[offset:height] = savesection
frame[0:offset2] = savesection2
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
if cv2.waitKey(1) & 0xFF == ord('m'):
offset=offset+50
savesection = frame[offset:height,0:width]
frame[offset:height] = savesection
print("offset changed to " + str(offset))
print(len(savesection))
cap.release()
cv2.destroyAllWindows()