Camera Frame Rate Configuration Guide: Adjusting FPS in Different Exposure Modes

Introduction

Setting the appropriate frame rate (FPS) is essential for achieving the desired video smoothness in camera applications. This guide will explain how to set a specific FPS based on different exposure modes, covering operations in Auto Mode, AGC Mode, and Manual Mode. By using the vizion-ctl tool, users can flexibly control the camera's frame rate and optimize image quality. Additionally, users can adjust FPS through Exposure Control, which can achieve the desired frame rates by adjusting exposure time and gain.

Exposure Modes Overview

1. Auto Exposure Mode

Description

• In Auto Mode, the camera's exposure settings (exposure time and gain) are fully controlled by the Image Signal Processor (ISP).

• Frame rate (FPS) and gain are dynamically adjusted in response to environmental changes.

Use Cases:

• Dynamic Scenes: Ideal for environments like conference rooms or events where lighting changes frequently.

• Low Light Conditions: Suitable for nighttime or poorly lit areas.

Example Command Usage

Here an example for setting the fixed framerate in auto exposure mode.

1. exposure_mode: Enable auto exposure mode.

vizion-ctl -d 0 -s exposure_mode=1

2. exposure_min_time: Specify the exposure min time to 16666 us(FPS=60).

vizion-ctl -d 0 -s exposure_min_time=16667

3. exposure_max_time: Specify the exposure max time to 16666 us(FPS=60).

vizion-ctl -d 0 -s exposure_max_time=16667

It means there is an exposure interval to contranst the exposure time.

Advantages

• Easy setup for changing lighting conditions.

• Automatically adjusts exposure for unpredictable environments.

Disadvantages

• Frame rate and image quality may fluctuate, especially in varying lighting conditions.

2.AGC Mode (Auto Gain Control)

Description

• In AGC mode, the gain is adjusted automatically to maintain optimal brightness, while the exposure time remains fixed. Frame rate stays stable, and only gain changes as necessary.

Use Cases

• Uneven Lighting Conditions: Works well outdoors or in scenarios where lighting fluctuates.

• Surveillance: Useful for security applications requiring stable video feeds.

Example Command Usage

1. exposure_mode: Enable auto gain mode.

vizion-ctl -d 0 -s exposure_mode=2

2. exposure: Specify the exact exposure time to 16666 us(FPS=60).

vizion-ctl -d 0 -s exposure=16666

Advantages

• Stable image quality with controlled exposure time.

• Ideal for situations with fluctuating lighting.

Disadvantages

• Noise may increase in low-light conditions due to higher gain settings.

3. Manual Mode

Description

• In Manual Mode, the user manually sets both exposure time and gain. These settings remain fixed, and the frame rate is determined based on the exposure and gain values chosen.

Use Cases

• Professional Environments: Perfect for use in filmmaking, live streaming, or photography, where precise control over exposure and gain is required.

• Controlled Lighting: Best for use in settings with consistent and predictable lighting.

Example Command Usage

1. exposure_mode: Enable manual mode.

vizion-ctl -d 0 -s exposure_mode=0

2. exposure: Specify the exact exposure time 16666 us(FPS=60).

vizion-ctl -d 0 -s exposure=16666

3.gain: Set a specific gain level(Gain=2x).

vizion-ctl -d 0 -s gain=2

Advantages

• Full control over exposure and gain, allowing for high-quality, tailored video output.

• Ideal for environments with controlled or predictable lighting.

Disadvantages

• Requires expertise to configure settings effectively.

• Less flexible than auto modes, especially in dynamic lighting situations.

Summary of Key Features to Control:

Understanding these AE modes enables users to fine-tune camera settings for different applications. Select the appropriate mode based on your specific needs to achieve the best image quality.

For further assistance, refer to the official TechNexion documentation or contact technical support.