Dark current intelligent processing method based on FPGA flying focus mode

Abstract

The invention belongs to the technical field of image processing, and particularly relates to a dark current intelligent processing method based on an FPGA flying focus mode. The method comprises an FPGA, an upper computer, a slip ring and a detector, and the FPGA comprises an RAM A and an RAM B; the method comprises the following steps: before a detector starts to collect exposure data, starting a flying focus data collection mode for the detector, collecting the dark current of each pixel point in the flying focus mode of the detector and under the condition of two focuses, storing the values in two RAMs in an FPGA (Field Programmable Gate Array), and after the exposure data is collected, switching focus position information of a bulb tube according to a control panel, subtracting dark currents of corresponding pixel points from data collected by the detector, and finally packaging the processed data and outputting to an upper computer. The method has the advantages that the uniformity of the collected flying focus data can be improved, and then the image quality is improved.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an intelligent dark current processing method based on FPGA flying focus mode. Background technique [0002] At present, in order to obtain a higher sampling rate and a higher resolution, a CT system generally adopts a flying focus mode. The flying focus mode is to control the focus to switch back and forth to obtain 2 times or more sampling efficiency, so that the resolution of the image is higher. [0003] However, in the flying focus mode, the dark current generated by the detector after the focus switch will change with the change of the focus, and the dark current will change with the temperature and humidity of the detector in each scan. If the dark current is not processed accordingly, the image reconstruction of the data collected in the flying focus mode will produce artifacts and affect the image quality. [0004] Therefore, it is very necessary t...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to overcome the problem in the prior art that in the flying focus mode, the magnitudes of the dark currents corresponding to the two focuses are inconsistent, resulting in artifacts and affecting image quality when the data collected in the flying focus mode is reconstructed, and provides A dark current intelligent processing method based on FPGA femto-focus mode is proposed, which can improve the uniformity of the collected femto-focus data and improve the image quality.

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