Invention Grant
- Patent Title: Systems and methods of eliminating video flicker caused by LED duty cycling to maintain brightness and control power consumption
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Application No.: US17536963Application Date: 2021-11-29
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Publication No.: US11758281B2Publication Date: 2023-09-12
- Inventor: Walter A. Martin , Terry Neill
- Applicant: Johnson Controls Tyco IP Holdings LLP
- Applicant Address: US WI Milwaukee
- Assignee: Johnson Controls Tyco IP Holdings LLP
- Current Assignee: Johnson Controls Tyco IP Holdings LLP
- Current Assignee Address: US WI Milwaukee
- Agency: Foley & Lardner LLP
- Main IPC: H04N23/745
- IPC: H04N23/745 ; H04N23/71 ; H04N23/73

Abstract:
A video camera system includes a video capture device and a camera controller. The video capture device includes a sensor that receives light, a shutter that selectively permits the light to be received at the sensor based on a shutter speed, and a frame processor that generates a plurality of video frames based on the light. The camera controller includes a frame parameter calculator that calculates a luminance parameter of the plurality of frames, a frequency domain analyzer that executes a frequency domain analysis based on the luminance parameter to generate a plurality of luminance amplitude values mapped to a plurality of frequencies, and a control signal generator that generates a target shutter speed based on the plurality of luminance amplitude values mapped to the plurality of frequencies, and transmits a control signal based on the target shutter speed to cause the shutter to operate at the target shutter speed.
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