Stable-frequency image display system
A technology for image display and frequency stabilization, applied in image communication, TV system components, TV, etc., can solve problems such as frequency instability and display distortion, and achieve the effect of high security and stable display frequency
Inactive Publication Date: 2015-03-25
CHENGDU CHUANGTU TECH
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[0003] The purpose of the present invention is to overcome the defect that the current image display system is unstable in frequency and easily cause display distortion, and to provide an image display system with stable frequency
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[0014] like figure 1 As shown, the frequency stable image display system of the present invention mainly includes an image acquisition module, a signal processing circuit connected with the image acquisition module, a constant current source circuit connected with the signal processing circuit, and an image recognition circuit. In order to better implement the present invention, a phase-locked loop circuit is also arranged between the constant current source circuit and the image recognition circuit.
[0015] Among them, the phase-locked loop circuit consists of a transistor Q2, a transistor Q3, a transistor Q4, a capacitor C4 whose positive pole is connected to the constant current source circuit, and whose negative pole is connected to the base of the transistor Q2, one end is connected to the collector of the transistor Q2, and the other end The resistor R6 connected to the collector of the transistor Q2 via the resistor R7 and the resistor R8, the negative electrode connec...
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The invention discloses a stable-frequency image display system. The system mainly comprises an image acquiring module, a signal processing circuit connected with the image acquiring module, a constant current source circuit connected with the signal processing circuit and an image recognizing circuit and is characterized by further comprising a phase-locked loop circuit arranged between the constant current source circuit and the image recognizing circuit, wherein the phase-locked loop circuit is composed of a triode Q2, a triode Q3, a triode Q4, a capacitor C4, a resistor R6, a capacitor C5 and the like, the positive electrode of the capacitor C4 is connected with the constant current source circuit, the negative electrode of the capacitor C4 is connected with the base of the triode Q2, one end of the resistor R6 is connected with the collector of the triode Q2, the other end of the resistor R6 is connected with the collector of the triode Q2 through a resistor R7 and a resistor R8, the negative electrode of the capacitor C5 is connected with the collector of the triode Q3 through a resistor R10 and a resistor R9 and the positive electrode of the capacitor C5 is connected with the emitter of the triode Q2. The system is provided with the lock-phased loop circuit which can make the display frequency of the image display system be more stable.
Description
technical field [0001] The invention relates to an image display system, in particular to an image display system with stable frequency. Background technique [0002] With the vigorous development of high technology, the face recognition system has been widely used as a human body password because of its convenience. In addition, intelligent management has entered people's social life now, and intelligent buildings have risen from the ground to meet the needs of the information age. As a noble building and office environment, it must functionally meet the needs of current and future development. Become a base for cultural and economic development. Therefore, the face recognition system has been applied to Daxia's access control recognition system. However, due to the flaws in the design of the current face recognition system, its display frequency is unstable, which may easily cause display distortion and affect the recognition results of the recognition system. SUMMARY O...
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IPC IPC(8): G06K9/00
CPCH04N5/148G06V40/166G06V10/12
Inventor 周鹏程刘芳
Owner CHENGDU CHUANGTU TECH