Spectral imaging system with high space and spectral resolution based on global shutter mode

Abstract

Provided is a spectral imaging system with high space and spectral resolution based on a global shutter mode, relating to a spectral imaging system based on a global HDR mode and solving the problem that a conventional spectral imaging system has low spectral energy and low signal-to-noise ratio in the application of high space and spectral resolution. The system comprises an optical system, an area array CMOS image sensor based on the HDR working mode, an imaging controller and an external memory; the optical system receives external spectral information and performs imaging on the area arrayCMOS image sensor based on the HDR working mode; the imaging controller controls the area array CMOS image sensor based on the HDR working mode to output a high-gain channel spectrum image and a low-gain channel spectrum image, and the high-gain channel spectrum image and the low-gain channel spectrum image are sent to the external memory to be subjected to off-chip CDS and HDR processing, and then a spectrum image is output. According to the invention, the high-frame-frequency requirements of high space and spectral resolution are met; under the same frame frequency, the power consumption ofthe CMOS image sensor is lower, and the size and the weight are smaller.

Description

technical field [0001] The invention relates to a spectral imaging system based on a global HDR (high dynamic range) mode, in particular to a high-sensitivity CMOS image sensor spectral imaging system working in a global shutter mode and using image synthesis based on high and low channel gain to realize HDR. Background technique [0002] Since the imaging spectrometer divides the information of the scene pixel into dozens or even hundreds of spectral channels, the energy received by each pixel of the focal plane array detector is greatly reduced, which directly leads to a serious decrease in the signal-to-noise ratio. Under the condition of resolution (better than 30m), the signal-to-noise ratio of imaging spectrometer often cannot meet the needs of practical applications. When the imaging spectrometer push-brooms the ground target, due to the high flying speed of the aircraft, the time (integration time) for each pixel on the detector to receive the radiation of the ground...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low spectral energy and low signal-to-noise ratio in existing spectral imaging systems in high spatial and spectral resolution applications, the present invention provides a spectral imaging system with high spatial and spectral resolution based on global shutter mode

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