STRATUM

Realtime Slit Scan Camera

JP/EN

STRATUM is a slit scan camera application for iOS and iPad OS.

You can easily shoot high quality slit scan images with iOS devices after iOS 13.

Features

  • Eight kinds of slit scans are possible with four kinds of slit patterns and reverse scan.

  • Tap the shutter button to take a photo.

  • Press and hold the shutter button or drag to the right to start recording.

  • Models with a high-speed camera can shoot at 240 to 1 FPS.

  • The slice size (number of strips) can be set up to around 500. (*1)

  • Manual focus lock, exposure adjustment

  • Equipped with external display output for performance art and installation.

  • You can preview the taken photos and videos in the app.

Overview

Slit scan is different from the actual time when shooting with an analog camera by attaching a paper with a slit in front of the camera lens, lengthening the exposure time and moving it in the vertical direction with the slit. It is a technique to take the exposure of a single photo.


Strictly speaking, STRATUM does not install a slit in front of the camera like slit scan, but it stores digitally captured data in memory, slices it in any direction, combines it for each frame and shoots in real time.


Due to the remarkable development of mobile devices in recent years, STRATUM has accumulated about 500 FHD images of 240FPS (*1) high-speed camera equipped with iOS, and composites and takes 500 photos at a time at a high frame rate of 60FPS.

Spec

In Stratum, each device limits the composition rate and the size of the composite image in order to perform the most reasonable processing possible for each device. The composite rate is different from the shooting rate. Any model capable of high-speed shooting can shoot at 240 FPS. (*2)

Synthesis rate of 30 FPS, 540p on iPhone 7

30FPS, 720p on iPhone XS

60FPS, 1080p on iPhone 11


It is controlled by the GPU family.

Record FHD 1080p, 60FPS with A13

HD, 30FPS recording with A11, A12

540p, 30FPS recording with A10

Annotation

*1

The slice size is automatically adjusted according to the amount of free memory,

Even on iPhone 7, you can reserve the maximum number (about 500) with a margin. If the slice size is small, please return to the home once, close the application that seems to consume the memory, and then shoot again.

The memory for the slices is released when the STRATUM enters the background.


*2

Spec limits are controlled by MetalFeatureSet.

var refreshRate : Int { if device.supportsFeatureSet(.iOS_GPUFamily5_v1) { return 60 }else{ return 30 }}
let sizeW : Int = { if device.supportsFeatureSet(.iOS_GPUFamily5_v1) { return 1080 }else if DKUtils.device.supportsFeatureSet(.iOS_GPUFamily4_v1) { return 720 }else{ return 540 }}()
let sizeH : Int = { if device.supportsFeatureSet(.iOS_GPUFamily5_v1) { return 1920 }else if DKUtils.device.supportsFeatureSet(.iOS_GPUFamily4_v1) { return 1280 }else{ return 960 }}()