By Ioannis Pavlidis
The speedy upward thrust of PC-based cameras has result in the large development of software program purposes that use real-time video programming. those functions contain video conferencing, computing device video games, clinical learn, automatic defense and surveillance, business inspection, and internet cameras. formerly, builders needed to seek via producer manuals or learn papers in machine imaginative and prescient or picture processing to benefit the right way to software units for those purposes.
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Additional resources for Programming cameras and pan-tilts with DirectX and Java
Sample text
DirectShow exposes a number of COM objects and interfaces that empower the developer to access, process, and display multimedia streams. Our objective is to use these objects to build powerful video-processing applications. Where appropriate, we expand the functionality of DirectShow by building new objects from scratch. First, this chapter elaborates on the definition of COM objects and interfaces, concepts that are absolutely necessary in building our own DirectShow objects. Then it introduces the secrets of building simple DirectShow applications.
6 How to Write a DirectShow Filter In this book we mostly focus on the writing of transform filters. The source and rendering filters that come with the DirectShow SDK are satisfactory for most application needs. We can break the writing of a transform filter into the following discrete steps: 1. Determine if the filter must copy media samples or handle them in place. The fewer copies in the media stream, the better. However, some filters require a copy operation; this influences the choice of base classes.
There is a gap between this mode of communication and the higher level software. This gap is bridged by a special piece of midlevel software called a driver. High-level software cannot deal directly with hardware devices such as cameras and hard drives. It can deal very effectively, however, with files. In the Windows operating system, a driver makes a device look like a file. A handle to the device can be opened. An application program can then issue read and write requests to the driver before the device handle is finally closed.