Image capture (or video capture) from camera is conducted with the help of the computer — it is especially convenient when afterwards analysis and processing of the received frame is planned. Control of capture devices and determining their saving parameters are possible with the help of specially worked out software at PC.
Videocamera control includes the start of the stream of frames and their stop, as well as capturing images from video. Besides, it is possible to set the capture settings, such as, for example, exposition parameters (exposure, shutter speed, capture mode, ISO, etc.), white balance setting, image settings (contrast, saturation, brightness, gamma, etc.) and capture (separate capture, automatic series of frames). Here one should take into account the fact that the models of videocameras, webcameras and digital photocameras have different settings.
Besides, carrying out the capture of the image from the computer it is possible not only to use the function of the image preview, but also to determine parameters of its saving. Namely: file format, type, quality, saving path, name, etc.
Application for image capture
Capture of images from camera can be carried out with the help many different applications, but not all of them support the required system of images input (video, web, photocameras), as even equipment producers not always provide software for its control from the computer, and it is more difficult to find it by third-party developers.
Application for video camera control Altami VideoKit and Altami Studio application, which also suits for analysis and processing of the received images, support such devices standards as Microsoft DirectShow, Altami Capture Device, UVC. Besides; all applications are cross-platfom and work with camera models, such as Canon EOS and Canon PowerShot, and in most of popular operating systems (Windows XP SP3, Windows Vista, Windows 7 (х86 and х64); Alt Linux, Open Suse 11.3, Ubuntu 10.04 LTS and later; Mac OS X 10.6 Leopard). Also, in both programs support of high-speed video cameras USB 3.0 Point Grey is implemented. As it is easy to adapt into the applications new types of capture devices, the list of supported cameras is constantly updated.
Altami VideoKit and Altami Studio work with the stream from camera or photocamera in real-time mode, and the processing of video stream in applications takes place with the same speed, with which the capture device transmits the information.
In order to capture and save images in applications several ways of doing that are realized: quick capture of the current frame and automatic — with adjusted period. In applications it is possible to save the received frame as a graphic file: in applications possibility of work with images in most of popular formats is realized (BMP, JPG, PNG, TIFF).
Besides, in Altami Studio application captured images can be analyzed and processed in real-time mode: many functions on work with colours and form of images are realized, also, filters for morphological, threshold and other transformations are developed.