Apparatus and method of converting image signal
First Claim
1. A method of converting a digital image signal into an analog image signal, the method comprising:
- receiving a digital image signal that is obtained through an image sensor;
determining one of a national television system committee (NTSC) standard and a phase-alternating line (PAL) standard as a target standard;
changing a number of horizontal scan lines of the digital image signal to comply with a vertical resolution of the target standard;
generating a sample frequency by dividing a number of horizontal pixels of the digital image signal by a horizontal scan period that complies with the target standard;
converting the digital image signal having the changed number of horizontal scan lines into an analog image signal according to the sample frequency; and
transmitting the analog image to a video amplifier and a low-pass filter,wherein the video amplifier is configured to amplify the analog image signal, andwherein the low-pass filter is configured to pass through the amplified analog image signal, have a cutoff frequency of 11.25 MHz, and include a capacitor for preventing a surge.
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Accused Products
Abstract
Provided are an apparatus and method of converting a digital image signal, which is obtained through an image sensor comprising a plurality of pixels that are arranged in a matrix, into an analog image signal in order to transmit the analog image signal to a monitor device that outputs an image complying with a national television system committee (NTSC) standard or a phase-alternating line (PAL) standard. The method includes: generating a sample frequency based on the number of horizontal pixels of the digital image signal to comply with a horizontal scan period of the NTSC standard or the PAL standard; and converting image data of the horizontal pixels of the digital image signal into the analog image signal, according to the sample frequency.
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Citations
19 Claims
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1. A method of converting a digital image signal into an analog image signal, the method comprising:
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receiving a digital image signal that is obtained through an image sensor; determining one of a national television system committee (NTSC) standard and a phase-alternating line (PAL) standard as a target standard; changing a number of horizontal scan lines of the digital image signal to comply with a vertical resolution of the target standard; generating a sample frequency by dividing a number of horizontal pixels of the digital image signal by a horizontal scan period that complies with the target standard; converting the digital image signal having the changed number of horizontal scan lines into an analog image signal according to the sample frequency; and transmitting the analog image to a video amplifier and a low-pass filter, wherein the video amplifier is configured to amplify the analog image signal, and wherein the low-pass filter is configured to pass through the amplified analog image signal, have a cutoff frequency of 11.25 MHz, and include a capacitor for preventing a surge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for converting a digital image signal into an analog image signal, the apparatus comprising:
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a receiver configured to receive a digital image signal that is obtained through an image sensor; a controller configured to determine one of a national television system committee (NTSC) standard and a phase-alternating line (PAL) standard as a target standard, change a number of horizontal scan lines of the digital image signal to comply with a vertical resolution of the target standard, generate a sample frequency by dividing a number of horizontal pixels of the digital image signal by a horizontal scan period that complies with the target standard, and convert the digital image signal having the changed number of horizontal scan lines into an analog image signal according to the sample frequency; a video amplifier configured to amplify the analog image signal; and a low-pass filter configured to pass through the amplified analog image signal, have a cutoff frequency of 11.25 MHz, and include a capacitor for preventing a surge. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of converting a digital image signal into an analog image signal, the method comprising:
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receiving a digital image signal that is obtained through an image sensor; determining one of a national television system committee (NTSC) standard and a phase-alternating line (PAL) standard as a target standard; changing a number of horizontal scan lines of the digital image signal to comply with a vertical resolution of the target standard; generating a sample frequency by dividing a number of horizontal pixels of the digital image signal by a horizontal scan period that complies with the target standard; converting the digital image signal having the changed number of horizontal scan lines into an analog image signal according to the sample frequency; and transmitting the analog image to a video amplifier and a low-pass filter, wherein the video amplifier is configured to amplify the analog image signal, and wherein the low-pass filter is configured to include a capacitor having a capacitance value equal to or less than 188 pF.
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Specification