![]() Infrared camera systems, valid for microbolometer sensors as for pyroelectric sensors, suffer from dead elements. In order to avoid these negative effects on the image quality, substitution algorithms have to be designed. Section 2.1.1 and 2.1.2 give a review of infrared sensors.ĭead elements, meaning defective sensor pixels, may interfere images remarkable. Infrared waves are not visible to human eyes but can be seen by special instruments that translate infrared into colors that are visible to our eyes. This wavelength (highlighted in figure 1.1) of light warms objects without warming the air between the source and the object. ![]() The electromagnetic spectrum is divided into three segments by wavelength, which is measured in microns (1/1,000,000 of a meter). The data is analyzed and processed by using a XILINX Spartan3 XA3S1000 evaluation board, adapted for the application (see figure 0.2 to the right). The sensor construction, including the optics, can be seen in the image above to the left. Figure 0.2 illustrates the hardware which was worked with.įigure 0.2: Hardware view of the camera module Due to the fact that the sensor (ULIS Long-Wave InfraRed (LWIR) uncooled microbolometer) which should be employed, is not available in the first phase of the development process, the data format, timing, resolution and the serial configuration interface of the sensor was emulated by the use of a KITE pyroelectric sensor (see sectionĢ.4 and figure 2.28 for the block diagram of the sensor emulator). The purpose of the defective pixel module is to substitute degraded sensor elements. It serves as interface between the offset- and gain-correction module and the image scaling block. The dead pixel substitution module (see figure 0.1) is topic of this paper. The more complex the algorithms are, the more hardware (Configurable Logic Blocks (CLB's), Look Up Tables (LUT's) etc.) is required. The matter of fact, that the algorithms which are fulfilling the tasks of the individual modules (see figure 0.1), will run on an FPGA, should be regarded in the design process. On this account the idea of a system without the need of a external RAM chip emerged. The chip provides a sufficient amount of logic cells and distributed Random Access Memory (RAM) - as well as block RAM bits. The system will run on an FPGA, which will be of the order of a XILINX Spartan-3A DSP XC3SD3400A. The following figure 0.1 shall demonstrate the modules necessary to realize the task. The whole system should be a single chip solution, running on an FPGA. In order to enhance the market position, the development of a complete IR camera system, from the sensor to the display, was initiated. 2.1.1 Types of defects concerning monolithic pyroelectric arraysĢ.1.2 Types of defects concerning microbolometer technologyĢ.3.2 Correction and display of test picturesĢ.4.1 Entity declaration and data transferĪctive Photonics AG works on thermal imaging systems.
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