Exploring the Features and Applications of USB Video Class Cameras

USB Video Class cameras are a type of camera that can be easily connected to a computer via a USB port.

These cameras are designed to be plug-and-play, meaning they can be quickly connected and recognized by the computer without the need for additional drivers or software.

They're perfect for applications where high-quality video is essential, such as in surveillance, medical imaging, and video conferencing.

One of the key features of USB Video Class cameras is their ability to capture high-resolution video at a high frame rate, making them ideal for applications where detailed video is required.

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USB Video Class cameras rely on the UVC driver, which is the USBVideo.sys driver that ships with the OS.

The UVC driver enables the camera to communicate with the computer, allowing it to output video streams.

Here's a quick rundown of some key terms you'll encounter when working with USB Video Class cameras:

Some cameras are designed to output only non-color streams, such as IR or Depth cameras, which are often referred to as sensor cameras.

A camera is a device that captures images or videos, and UVC cameras are a type of camera that comply with the USB video class standard.

UVC cameras use a standard protocol that allows for seamless compatibility between various devices without the need to install additional programs.

They are widely used in applications such as access control systems, augmented reality, and medical imaging, thanks to their high bandwidth, reliability, and ease of integration.

UVC cameras offer plug-and-play functionality, which means you can easily connect them to your device and start using them right away.

Their superior low-light performance provides reliable live images, making them suitable for video surveillance and monitoring.

UVC cameras provide 24/7 live surveillance, so you can keep watching your surroundings and rest easy.

They are also used in video conferencing, live streaming, and other applications that require real-time video transmission.

Overall, UVC cameras are a convenient and affordable solution for capturing high-definition video quality.

Their broad compatibility across a wide range of devices makes them a versatile and cost-effective solution for many applications.

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Terminology is a crucial aspect of understanding the basics of USB Video Class (UVC) technology. UVC stands for USB Video Class, which is a set of standards for video capture devices.

The UVC driver, also known as USBVideo.sys, ships with the operating system and plays a vital role in enabling video capture functionality.

A color camera is a type of camera that outputs color streams, such as RGB or YUV cameras. IR, on the other hand, stands for Infrared.

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Sensor cameras, which include IR cameras, output non-color streams. This is in contrast to color cameras that output color streams.

Here's a list of key terms and their descriptions:

BOS stands for Binary Device Object Store, which is a crucial component in the UVC ecosystem. The MS OS 2.0 Descriptor is a Microsoft platform-specific BOS device capability descriptor.

Sensor cameras are categorized into two types: color cameras and non-color sensor cameras. Non-color cameras include gray scale, IR, and Depth cameras.

A camera that supports only color formats should be registered under KSCATEGORY_VIDEO_CAMERA. Cameras that support IR or Depth-only format types should be registered under KSCATEGORY_SENSOR_CAMERA.

A camera that supports both color and non-color format types should be registered under both KSCATEGORY_VIDEO_CAMERA and KSCATEGORY_SENSOR_CAMERA. This categorization helps applications select the camera they want to work with.

The UVC driver supports both types of cameras. A camera can specify its category preference through attributes in its BOS MS OS 2.0 Descriptor.

A value of 1 for SensorCameraMode will register the device under KSCATEGORY_SENSOR_CAMERA, and setting SkipCameraEnumeration to 1 will make the camera available to applications looking only for sensor cameras.

A value of 2 for SensorCameraMode will register the device under KSCATEGORY_SENSOR_CAMERA & KSCATEGORY_VIDEO_CAMERA, making the camera available for applications looking for either sensor and color cameras.

If a camera exposes only sensor camera media types, it should use a value of 1 for SensorCameraMode and 1 for SkipCameraEnumeration. If a camera exposes both sensor camera and color camera media types, it should use a value of 2 for SensorCameraMode.

If the SensorCameraMode and SkipCameraEnumeration attributes aren't specified, the camera is registered as a color camera and will be visible only to color camera aware applications.

USB video class cameras, also known as UVC cameras, are a type of camera that offers many advantages over other types of cameras.

One of the key benefits of UVC cameras is their plug-and-play functionality, which allows them to be easily connected to a computer or host device without the need for additional drivers or software.

This makes them quick and easy to set up, saving you time and hassle.

UVC cameras are also relatively low-cost, making them an affordable solution for embedded applications.

You can easily find UVC cameras for purchase at electronics retailers and online marketplaces due to their wide availability.

Some of the key features of UVC cameras include:

Windows 10, version 1703, introduced an inbox Device MFT for UVC cameras known as Platform DMFT (PDMFT) on an opt-in basis.

This allows IHVs and OEMs to take advantage of Windows provided post processing algorithms. The PDMFT enables face-based Region of Interest (ROI) for 3A adjustments in ROI-capable USB cameras.

To opt in to use PDMFT, a UVC camera needs to specify the EnablePlatformDmft through BOS descriptor. The value to specify is a DWORD by name UVC-EnablePlatformDmft and its value is set using the BOS descriptor.

If you can't update the device firmware, you can use a custom INF file to enable Platform DMFT for the device. The EnablePlatformDmft entry is set to 0x1 (Enabled) to use the inbox Platform DMFT for the device.

Here's a list of features supported by Platform DMFT:

Note that if the camera does not support UVC 1.5 based ROI, then the PDMFT will not load even if the device opted in to use PDMFT.

The UVC specification provides a mechanism to specify if the video streaming interface supports Method 1/2/3 type still image capture.

To make the OS take advantage of the device's Method 2/3 still image capture support, the device firmware can specify a value in the BOS descriptor, specifically the UVC-EnableDependentStillPinCapture DWORD.

You can also use a custom INF file to specify that your camera supports Method 2 or Method 3 still capture method, which must include the AddReg entry: EnableDependentStillPinCapture: REG_DWORD: 0x0 (Disabled) to 0x1 (Enabled).

By setting this entry to Enabled (0x1), the capture pipeline leverages Method 2/3 for still image capture, assuming the firmware also advertises support for Method 2/3 as specified by UVC spec.

Platform Device MFT is a feature in Windows 10 that allows device manufacturers to take advantage of Windows-provided post-processing algorithms. Starting in Windows 10, version 1703, Windows provides an inbox Device MFT for UVC cameras known as Platform DMFT (PDMFT) on an opt-in basis.

PDMFT enables face-based Region of Interest (ROI) for 3A adjustments in ROI-capable USB cameras. This feature is supported in Windows 10, version 1703.

If a camera doesn't support UVC 1.5 based ROI, the PDMFT will not load even if the device opted in to use PDMFT. This means that the camera's capabilities will determine whether PDMFT is used.

To opt in to use PDMFT, a UVC camera can specify the EnablePlatformDmft through BOS descriptor. This involves setting a DWORD value to 0x1 (Enabled) in the BOS descriptor.

Here's an example of how to enable Platform DMFT with a custom INF file:

When the EnablePlatformDmft entry is set to Enabled (0x1), the capture pipeline uses the inbox Platform DMFT for the device. This allows the camera to take advantage of Windows-provided post-processing algorithms.

An example composite device is a great way to illustrate how a device can have multiple functions. This device is a camera with two functions: a UVC color camera and a UVC IR camera.

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The device is registered under two categories: KSCATEGORY_VIDEO_CAMERA for the color camera function and KSCATEGORY_SENSOR_CAMERA for the IR camera function. This allows the device to be recognized by the operating system as a camera with multiple capabilities.

The device enables the color camera function for still image capture, which is a key feature for many users. By associating the color and IR camera functions as a group, the device can be easily managed and controlled by the operating system.

Here are the steps to register the device:

The BOS descriptor for this device specifies the MS OS 2.0 descriptor platform capability GUID, a vendor control code, and the applicable OS version (Windows 10 and later). The vendor control code is used to retrieve the MS OS 2.0 descriptor, which contains information about the device's capabilities and features.

TechNexion Type-C cameras are designed with flexibility in mind, offering rolling or global shutter options to capture precise images in any application. This versatility is crucial in embedded vision projects where accuracy is key.

TechNexion USB3 Type-C UVC Compliant Cameras are available with either an M12 (S) mount or a C-mount, ensuring compatibility with a wide range of lenses for optimal image quality. This compatibility is a game-changer for developers who need to integrate cameras with various lenses.

One of the standout features of these cameras is their seamless integration into your system, with driverless functionality that works effortlessly with Linux or Windows 10/11 operating systems. This saves developers time and effort during the setup process.

The cameras also come in rugged aluminum or compact bare PCB options, making them suitable for a variety of applications. This range of options is a testament to TechNexion's commitment to meeting the diverse needs of developers.

Here's a summary of the key features of TechNexion Type-C cameras:

Microsoft OS Descriptors are used by UVC compliant cameras to specify Windows specific device configuration values in a platform capability BOS descriptor in its firmware. This allows the device to be configured without the need of an INF file on Windows OS.

The Microsoft OS Descriptor layout is defined, with fields such as dwLength, bcdVersion, wIndex, and wCount, which specify the version and properties of the descriptor.

A UVC-CPV2FaceAuth data payload is a 32-bit unsigned integer, where the high order 16-bit represents the 0 based index of the media type list exposed by the RGB pin, and the low order 16-bit represents the 0 based index of the media type list exposed by the IR pin.

Here are the supported cameras for publish Face Auth Profile via the MSOS Descriptors:

The BoMs 2.0 Descriptor is a way for UVC compliant cameras to specify Windows specific device configuration values in a platform capability BOS descriptor in its firmware. This is done using Microsoft OS 2.0 Descriptors, which can be found in the documentation.

UVC driver reads the configuration values from the device HW registry key and configures the device on the OS accordingly. For example, if the firmware specifies the device to be registered as a sensor camera, the UVC driver registers the device just under that category.

Configuring UVC devices through platform BOS descriptor is a mechanism that was enabled in Windows 10, version 1703 to help UVC device vendors configure the device without an INF file on Windows OS. This is a useful feature for device vendors.

The prefix "UVC-" is only needed for device properties that are specified through BOS descriptor and are per interface instance specific. If your device needs user mode plugins like DMFT, you need to supply an INF for installing the DMFT.

The UVC driver populates the device's category interface instance registry key with the same values without the prefix when it sees the registry values with the prefix "UVC-". This is done for any variable specified by the firmware, not just the ones listed above.

The Microsoft OS Descriptor Layout is a specific format that must be followed when creating these descriptors. It starts with a 4-byte dwLength field that indicates the total size of the descriptor.

The next field is bcdVersion, a 2-byte field that specifies the version of the descriptor. In the example provided, the version is 1.0, represented by the value 0x0100.

The wIndex field is a 2-byte field that indicates the type of the descriptor. In the example, the value is 0x0005, which represents an extended property OS descriptor.

The wCount field is a 2-byte field that indicates the number of custom properties in the descriptor. In the example, the value is 0x0001, indicating that there is only one custom property.

Here's a breakdown of the Microsoft OS Descriptor Layout:

The UVC-CPV2FaceAuth data payload is a 32-bit unsigned integer that represents the media type list exposed by the camera. It's divided into two parts: the high-order 16-bit represents the index of the media type list exposed by the RGB pin, and the low-order 16-bit represents the index of the media type list exposed by the IR pin.

Sensor Group Generation is a crucial process for OEMs building systems that provide both RGB and IR streams for Windows Hello support. This involves declaring two cameras, Type 1 and Type 2, to be part of a synthesized Sensor Group.

To do this, OEMs can declare a FSSensorGroupId and FSSensorGroupName tag in an Extension INF to be created under the device interface property for each camera. Alternatively, ODMs can use the same MSOS Descriptors to publish the FSSensorGroupId and FSSensorGroupName values.

The inbox Windows 10 USB Video Class driver will automatically take any MSOS Descriptor whose Payload Name has been prefixed with "UVC-" and migrate the tag into the device interface property store (removing the "UVC-" prefix). This allows a Type 1 and Type 2 Camera that publishes the following to be synthesized into a multi-device Sensor Group for use with Windows Hello:

The payload for each tag must be a Unicode String. The UVC-FSSensorGroupId payload must be a GUID string in the following format: {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}. The value of the GUID must be the same between the Type 1 and Type 2 Cameras and both cameras must be added to the same physical chassis.

USB video class cameras are incredibly versatile and have a wide range of applications. They're commonly used in industrial handheld scanners for capturing images, barcodes, or QR codes in logistics, warehousing, inventory management, and package tracking systems.

One of the key advantages of USB cameras is their high bandwidth capability. They offer a maximum theoretical bandwidth of up to 5 Gbps, making them suitable for high-resolution video capture and real-time image processing.

In telemedicine applications, USB cameras are used to capture high-resolution images or video footage for remote medical consultations, diagnostic purposes, or patient monitoring. They're often employed in devices such as telemedicine carts or telepresence robots.

USB cameras are also frequently integrated into microscopes, enabling researchers, scientists, or medical professionals to capture and analyze microscopic images. These cameras provide a convenient way to digitally record and study samples.

Here are some of the popular use cases where USB cameras are commonly employed:

In addition to these applications, USB cameras are also preferred in many embedded vision systems due to their prototyping and MVP development capabilities. They provide a cost-effective solution for early-stage development and testing, allowing engineers to quickly iterate and validate their vision systems' functionality.

UVC cameras are incredibly versatile and widely supported across various operating systems. They're a great option for anyone looking to capture high-quality video on the go.

Windows users can breathe a sigh of relief, as UVC cameras are supported by all modern versions of Windows OS, including Windows 10, 8, 7, and Vista. Mac users are also in luck, as UVC cameras are supported by all recent versions of mac OS, including the latest version, Big Sur.

Linux distributions like Ubuntu, Fedora, and Debian also support UVC cameras, making them a great choice for developers and tech enthusiasts. Android devices running Android 4.0 or later can also utilize UVC cameras, and iOS devices running iOS 6 or later are also compatible.

Here's a quick rundown of the supported operating systems:

UVC and MIPI cameras are both used in embedded vision applications, but they have fundamental differences. UVC cameras use a USB interface, while MIPI cameras use a MIPI interface, which is designed to be low-power and high-speed.

One key difference between UVC and MIPI cameras lies in the type of data being transmitted. UVC cameras primarily transmit video data, whereas MIPI cameras can transmit both video and imaging data.

In terms of power consumption, MIPI cameras are often used in applications where power is a constraint, such as in mobile phones and drones.

The choice between UVC and MIPI cameras depends on the application requirements. UVC cameras are easy to set up and use, with a wide range of supported devices, and are well suited for applications that require the transmission of video data.

Here's a comparison of UVC and MIPI cameras:

USB cameras and USB camera modules are often used interchangeably, but there is a technical distinction. A USB camera refers to a complete camera system, while a USB camera module refers to the camera component alone.

In the consumer world, a USB camera typically refers to an end-user camera, such as a webcam. In the embedded camera world, a USB camera refers to a complete camera system that includes the lens, sensor array, baseboard, adaptor board, and sometimes an Image Signal Processor (ISP) and enclosure.

USB 3.0 cameras operate 10X faster than USB 2.0 and distribute 1.8X more power to bus-powered devices than USB 2.0.

UVC cameras are widely supported by various operating systems, making them a great choice for many users.

The good news is that UVC cameras work seamlessly with Windows, supporting all modern versions of Windows OS, including Windows 10, 8, 7, and Vista.

Mac users are also in luck, as UVC cameras are supported by all recent versions of mac OS, including the latest version, Big Sur.

Linux enthusiasts can breathe a sigh of relief too, as UVC cameras are supported by most Linux distributions, including Ubuntu, Fedora, and Debian.

Mobile users can also take advantage of UVC cameras, with Android devices running Android 4.0 or later and iOS devices running iOS 6 or later also being supported.

Here's a quick rundown of the supported operating systems:

Logitech C920 is a popular USB video class camera known for its high-quality video and wide angle lens, capturing 1080p video at 30 frames per second. It's a great option for streaming and video conferencing.

The Razer Kiyo is another popular USB video class camera that's specifically designed for streaming and YouTube content creation. It features a built-in ring light and high-quality microphone.

The Microsoft LifeCam HD-3000 is a budget-friendly USB video class camera that's great for basic video conferencing needs. It captures 720p video at 30 frames per second and has a compact design.

The EpocCam is a wireless USB video class camera that allows for wireless streaming and video conferencing. It's a great option for those who want to move around freely while streaming.

The USB video class camera is a versatile device that can be used with a variety of devices, including laptops, desktops, and even smartphones.

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The development and support of USB video class cameras are crucial for their functionality and user experience.

These cameras use a standardized interface, which allows for easy integration with operating systems and software applications. This standardization is made possible by the UVC (USB Video Class) protocol, which is supported by most modern operating systems.

The UVC protocol provides a set of commands and functions that enable cameras to communicate with the host system, making it easier to develop and support camera applications. This includes functions for controlling camera settings, such as exposure and focus.

The UVC protocol also provides a set of standardized video formats, which allows cameras to transmit video data in a format that is easily understood by the host system. This reduces the complexity of video processing and enables faster and more efficient video transmission.

USB video class cameras are designed to be plug-and-play devices, meaning they can be easily connected to a computer and start working without the need for additional installation or configuration. This is made possible by the UVC protocol, which allows the camera to automatically configure itself with the host system.

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