Faster sensor pixel conversion times tend to introduce digital noise, so some amount of image processing can be done to remove this based on the camera sensor settings. Image ProcessingĪfter the image has been captured by the sensor, the camera firmware performs various image processing tasks on it to compensate for various sensor characteristics, current lighting, and desired image properties. Conversely, allowing a longer conversion time can let you take photos in darker environments, as long as the camera is steady. Using a flash can assist with letting more light hit the sensor, allowing it to convert pixels faster, giving better quality for the same amount of time. The longer a conversion can take, the better the quality. This process can depend on a number of things but ultimately comes down to two things - how long the conversion is allowed to take, and how bright the light is. Once light arrives at the sensor, it gets converted into digital pixels. Other cameras may also allow the region to focus to be specified (for "touch to zoom", or "face zoom" features). In some cases the camera will always use the center of the frame for this. This is usually done by measuring how sharp a particular area of the frame is, and by adjusting the lens assembly until it is maximally sharp. Some lens assemblies can automatically be adjusted so that an object at different distances from the camera can be kept in focus. The lenses themselves can sometimes be moved to adjust things like focus and zoom, or they might be fixed in an arrangement to give a good balance between objects in focus, and cost. The Lens AssemblyĪt one end of the camera assembly is the lens assembly (one or more lenses, arranged to focus light onto the sensor). If you're already familiar with this, you can skip ahead to Camera implementation details. In order to use the camera classes a quick overview of the way a camera works is needed. There are both C++ and QML APIs for common tasks. The Qt Multimedia API provides a number of camera related classes, so you can access images and videos from mobile device cameras or webcameras.
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