Automatic exposure controlling device and controlling method for digital photography

Abstract

The invention provides an automatic exposure controlling device and an automatic exposure controlling method for digital photography. The method comprises the following steps that an automobile emission control (AEC) sensor converts a received X ray into visible light, generates an electric charge signal, and transmits the electric charge signal to an integrator on an analog module by an interface; the integrator converts the electric charge signal into a voltage signal,amplifies and filters, and outputs the voltage signal to an analogue-digital conversion (ADC) module; the ADC module transmits the converted digital signal to a processing module (a microprocessor); the processing module performs digital filtering on the digital signal converted by the ADC module and compares the digital signal with the converted digital signal to select a maximum value; and finally, the processing module compares the maximum value with a preset value to determine whether a pulse signal is sent to an X-ray panel probe to sample. Compared with the traditional method, the automatic exposure controlling method has the advantages that a multistage amplifying and comparing module is eliminated, and the ADC module is added, so that the AEC is controlled in a digitalized mode; and the device is intelligentized and high in response sensitivity, and is difficultly interfered by the outside environment.

Description

technical field [0001] The invention relates to an automatic exposure control (AEC) technology, in particular to a digital photography automatic exposure control device and control method. Background technique [0002] In the process of medical X-ray photography, in order to ensure the quality of X-ray imaging while minimizing the radiation dose received by patients, controlling the start and end of X-ray exposure is a very critical technology. With the continuous development of science and technology, we strive to produce the best and best images with the smallest possible radiation dose, and automatic exposure control emerges at the historic moment due to its own advantages. Automatic exposure control (Automatic Exposure Control AEC) equipment is a device that controls the X-ray exposure time. Its function is to precisely control the X-ray exposure time under the premise of ensuring the quality of the X-ray image, so as to minimize the X-ray dose absorbed by the patient. ...

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a digital photography automatic exposure control device and control method, which is used to solve the problem that the gain of the integral module in the prior art is fixed, the response sensitivity is relatively low, and it is easy to be affected by The interference of the external environment, the problem that it is not easy to realize automation

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