Pixel misplacement adjustment method of infrared long-line detector

Abstract

The invention discloses a pixel misplacement adjustment method of a multi-piece-spliced infrared long-line detector. The method is mainly used for a scanning imaging system of the infrared long-line detector. According to the technical scheme, the method mainly includes the following steps: (1) misplacement parameters are adjusted in real time by means of a micro processor (Micro Blaze) in an FPGA; (2) DDR2SDRAM is read by means of a memory controller (Memory Control Block, MCB) so that large misplacement among modules of the long-line detector is adjusted; (3) adjustment of small misplacement inside the modules is achieved through a block memory (Block RAM) built in the FPGA; (4) data are sent to a main unit for display by means of a PCI Express protocol. The method has the advantages that by means of ping-pong buffer, the DDR2SDRAM and the PCI Express protocol, data transmission with a high data rate can be achieved, the misplacement parameters can be adjusted in real time through the embedded micro processor, the long-line detectors with different module quantities can be compatible, the modularization degree is high, and reusability is good.

Description

technical field [0001] The invention relates to the transmission and display of multi-chip spliced ​​infrared long-line images, in particular to a pixel misalignment adjustment method. It is mainly used to adjust the spatial misalignment of pixels caused by factors such as manufacturing and splicing process of infrared long-line detectors. Background technique [0002] Infrared long-line detectors mainly obtain infrared images by scanning. Infrared radiation is converted into an electrical signal by an infrared detector, and then read out by a readout circuit for analog-to-digital conversion. After the analog-to-digital conversion, the output digital signal is adjusted and preprocessed and then transmitted to the backend for display or further processing. In order to correctly display and process infrared images, the spatial misalignment of line detector pixels must be adjusted first. [0003] In the past, the scheme for adjusting the misalignment of infrared long-line det...

AI Technical Summary

Problems solved by technology

These methods mainly use SRAM or FLASH as the external memory, and adjust the large dislocation between the line detector modules and the small dislocation within the module together. For the detector with a large difference between the ultra-long line and the pixel position, a large It takes longer time to read and write addresses one by one, which is not suitable for high-speed real-time infrared image transmission system

Moreover, it is mostly assumed that the parameters of the large and small displacements of each module are the same, and the adjustment is not flexible enough.

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