Elimination of artifacts in captured images of LED tile displays
AssigneeH2V4 Holdco, Inc.
InventorsJeremy Hochman, Christopher S. Byrne
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Abstract
Systems and methods for moving image capture from video displays that use pulse width modulation (PWM) control are disclosed. In particular, systems and methods for synchronizing display and camera timing so as to reduce or eliminate artifacts appearing in the captured moving images due to unsynchronized interaction between camera shutter/exposure timing and the timing of the display PWM control signal.
Claims30
A method of image capture of a scene including at least one display driven by a PWM control signal, comprising:
- initiating image capture with an image capture device at an initial time with the PWM control signal set to off at the initial time;
- setting the PWM control signal to on after a first partial shutter period of the image capture device;
- maintaining the PWM control signal at on during an open shutter period of the image capture device;
- setting the PWM control signal to off at or before a second partial shutter period of the image capture device;
- and
- repeating each said setting and maintaining of the PWM control signal through a series of image capture frames.
A method of image capture of a scene including at least one display driven by a PWM control signal using at least one image capture device wherein the image capture device captures images in frames with each frame including at least one partial shutter period, an open shutter period and a closed shutter period, the method comprising:
- dividing each frame into a plurality of time slices;
- setting the PWM control signal to off during time slices aligned in whole or in part with the partial shutter periods;
- setting the PWM control signal to on during time slices aligned in whole or in part with the open shutter periods;
- initiating image capture with said PWM control signal settings;
- and
- maintaining said PWM control settings through a series of image capture frames.
A method of image capture of a scene including at least one display using at least one image capture device, comprising:
- displaying on the at least one display a first static color during a sync delay time beginning at an initial time;
- displaying on the at least one display a second static color during a sync on time beginning after the sync delay time;
- displaying on the at least one display a third static color after the sync on time;
- capturing an image of the at least one display device with the image capture device;
- adjusting the sync delay time and the sync on time until the first and third static colors do not appear in the captured image of the at least one display;
- changing the second static color of a desired video feed;
- and
- capturing the scene including the at least one display displaying the desired video feed.
An image capture system, comprising:
- an image capture device configured to capture a moving image of a scene, the image capture device comprising a shutter mechanism capturing images in a series of frames, each frame including an open shutter period preceded and followed by partial shutter periods;
- a system display device that includes:
- a light emitting display surface configured to display images within the scene captured by the image capture device, and
- a driver configured to drive the light emitting display surface with a PWM control signal;
- and
- a control device that:
- sets the PWM control signal to off during partial shutter periods of the image capture device, and
- sets the PWM control signal to on during open shutter periods of the image capture device.
Dependencies are inferred from the claim text.