PTZ Camera Tracking With Adaptive Pan, Tilt, And Zoom Speeds

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Solution Overview

Problem

Existing PTZ camera systems struggle to accurately track objects to a target position, particularly when the object's speed is low, leading to poor video quality due to slow pan, tilt, and zoom speeds, or the object failing to reach the target position on time.

Innovation Solution

An arithmetic device and method that dynamically adjust the pan, tilt, and zoom speeds based on the distance difference between the object's position and the target position, switching between two control modes to ensure precise tracking and improved video quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If dead zone control is performed to stop pan, tilt, and zoom operations when the tracking object is near the target position, then video quality is improved, but the tracking object may not reach the target position or reaches it late

Engineering Contradiction:

Improvevideo qualityVSAvoidtime to reach target position

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent applies dynamics by making the control mode switchable based on real-time conditions. The system dynamically transitions between first control mode (with dead zone control for stability) and second control mode (without dead zone control for responsiveness) according to the tracking object's speed and position, allowing the pan, tilt, and zoom speeds to be adjusted dynamically rather than fixed

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the control parameters (pan speed, tilt speed, zoom speed) based on the tracking object's moving speed and distance from target position. By adjusting these parameters according to different conditions, the system resolves the contradiction between maintaining video quality and ensuring timely arrival at the target position

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If pan, tilt, and zoom speeds are decreased to improve video quality when the tracking object is close to target position, then video quality is improved, but the tracking object does not reach the target position or reaches it late

Engineering Contradiction:

Improvevideo qualityVSAvoidspeed to reach target position

Core Design Contradiction:

Manufacturing precisionVSSpeed

Solution Approach 1:

The system dynamically adjusts pan, tilt, and zoom speeds based on the tracking object's state. When the object is moving fast, higher speeds are used to catch up; when the object is slow or stationary, lower speeds are used to maintain video quality. This dynamic adjustment resolves the contradiction between speed and video quality

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If multiple control modes are used to track objects with different speeds, then tracking capability across speed ranges is improved, but mode switching is impossible when the tracking object speed is constant

Engineering Contradiction:

Improvetracking capability across speed rangesVSAvoidmode switching capability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent uses feedback by continuously monitoring the tracking object's speed and distance from the target position, then automatically selecting the appropriate control mode based on this feedback. The system compares the current state with predefined conditions and switches modes accordingly, enabling automatic adaptation without manual intervention even when speed is constant

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system makes the control mode dynamic and switchable based on real-time conditions. Rather than being stuck in a single mode, the system can transition between first control mode (with dead zone) and second control mode (without dead zone) based on the tracking object's speed and position, resolving the issue of inability to switch modes when speed is constant

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4601311A1Arithmetic device, arithmetic method, and computer-readable storage medium

Publication Date: 2025.08.13 CANON KK

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AI summary

Arithmetic devices, methods, and storage mediums are provided herein. At least one device calculates a control speed for controlling a posture of an image capturing device so that a detection position of an object detected from an image captured by the image capturing device becomes closer to a target position of the object in the captured image. In a state where a difference between the detection position and the target position is not smaller than a first threshold, the device calculates a first control speed as the control speed of the posture in accordance with the difference, and in a case where the difference becomes smaller than the first threshold and not smaller than a second threshold smaller than the first threshold after the state, the device calculates, as the control speed of the posture, a second control speed higher than the first control speed in accordance with the difference.