Apparatus and method for compensating a color carrier of an image signal
A signal and carrier technology, applied in the field of color carrier devices, can solve the problem that the chrominance signal processor cannot accurately compensate the color carrier phase deviation, color change, etc.
Inactive Publication Date: 2004-01-14
SAMSUNG ELECTRONICS CO LTD
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Therefore, when the phase deviation of the color carrier contained in the input image signal exceeds a predetermined standard deviation range due to external environment changes, or when the phase of the subcarrier exceeds the standard tuning range due to deviation of the load cap of the oscillation device, the chroma The signal processor 130 cannot accurately compensate for the phase deviation of the color carrier; therefore, problems arise such that the color of the output image signal may change, or a black and white image signal may be displayed
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[0015] Embodiments of the present invention will be described in detail with reference to the accompanying drawings, examples of which are shown in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
[0016] figure 2 It is a block diagram of an image processing system with a device for compensating image signal color carrier according to an embodiment of the present invention. see figure 2 , the image processing system according to an embodiment of the present invention includes: a phase-locked loop (PLL) unit 200, an analog-to-digital converter (ADC) 210, a comb filter 220, a chroma signal processor 230, a format converter 240, a chroma Carrier frequency detector 250 and absolute difference detector 260 .
[0017] and figure 1 Similar to the PLL unit 100 shown in , the PLL unit 200 includes a PLL1 201 and a PLL2 202 . PLL...
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An apparatus to compensate a color carrier in an image processing system to convert an input analog image signal into a digital image signal includes a detector, a phase-locked loop unit, a difference detector, and a color signal processor. The detector detects a frequency of the color carrier in a color signal of the digital image signal. The phase-locked loop unit generates a subcarrier frequency by performing a phase-locked loop operation on a system clock signal applied to the image processing system. The difference detector detects a difference between the frequency of the color carrier and the subcarrier frequency. The color signal processor compensates for a phase deviation of the color carrier of the color signal using the subcarrier frequency generated by the phase-locked loop unit.
Description
technical field [0001] The present invention relates to a device and method for compensating the color carrier of an image signal, in particular to a device and method for automatically compensating the phase deviation of the color carrier of an image signal when converting an analog image signal into a digital image signal. This application claims the priority of Korean Patent Application No. 2002-29957, filed on May 29, 2002, which is hereby incorporated by reference in its entirety. Background technique [0002] see figure 1 , to convert an input analog image signal into a digital image signal, a conventional image processing system includes a phase-locked loop (PLL) unit 100, an analog-to-digital converter (ADC) 110, a comb filter 120, a chrominance signal processor 130 and format converter 140 . shown in figure 1 An image processing system is called a video decoder. [0003] The PLL unit 100 includes PLL1 101 and PLL2 102 and generates signals by phase locking an in...
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IPC IPC(8): H04N9/64H04N9/455
CPCH04N9/455H04N9/64
Inventor 金学载
Owner SAMSUNG ELECTRONICS CO LTD