KR19990061434A - Video Signal Processing Unit for AMA Projectors - Google Patents

Abstract

The present invention relates to an image signal processing apparatus of an AMA projector for converting an image signal applied by interlaced scanning to R (Red), G (Green), and B (Blue) into an image signal for a sequential scanning AMA projector. In order to prevent deterioration of image quality due to the interlacing method, an external NTSC frame is reconstructed into two AMA projector frames, one of which is applied to data for each scan line constituting one frame for NTSC. By reconstructing by subtracting the preset K and reconstructing the other one by adding the preset M, one frame of 525 lines can be scanned at the time of scanning one field, so that the image provided by the AMA projector can be scanned. There is an effect that can improve the image quality.

Description

Video signal processing device for AAM projectors

The present invention relates to a system for converting a format of video data, and more particularly, to convert a video signal format of a conventional National Television System Committee (NTSC) method into a format of a video signal suitable for an AMA projector (Actuated Mirror Arrays Projector). It relates to a video signal processing device for an AMA projector configured to.

An AMA projector is a type of projection image display device that refers to a device that displays a predetermined image by reflecting light incident from a light source at a predetermined angle for each M × N (M, N is a natural number) pixel. Compared to the CRT representing a direct-view image display device, the device operates at a lower voltage, consumes less power, provides images without distortion, and is a type of the same projection image display device, a liquid crystal display (LCD) or a DMD. It has the advantage of high light efficiency compared to (Deformable Mirror Device), and its development is actively underway.

In such an AMA projector, the interlaced scanning method is selected. The operation process of the AMA projector by the interlaced scanning method will be described as follows.

First, for each of R (Red), G (Green), and B (Bleu) separated from an NTSC video signal applied from the outside, 525 lines of video signals corresponding to one frame are 262.5. After separating the odd field consisting of odd lines of lines and the even field consisting of even lines of 262.5 lines, the odd number of 262.5 lines constituting the odd field is first shown in FIG. The lines are sequentially scanned, and as shown in FIG. 1B, 262.5 lines constituting the even field are sequentially scanned.

However, since the AMA projector projects a large screen on the screen, when the image signal is processed in an interlaced manner, a problem arises in that image quality is degraded due to the space between the scan lines.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to sequentially scan by reconstructing an interlaced scanning NTSC 1 frame by a predetermined value and reconfiguring the image frame for two AMA projectors. The present invention provides an image signal processing apparatus of an AMA projector capable of processing an image signal of a method.

In order to achieve the above object, in the present invention, converting the image signal provided by the interlaced scanning method for each of R (Red), G (Green), B (Blue) into an image signal for the sequential scanning AMA projector An image signal processing device of an AMA projector for

An A / D converter for converting each of the R, G, and B color signals into digital data based on a predetermined sampling frequency; A first odd field memory for storing digital data corresponding to an odd-numbered odd field among the A / D converted digital data; A first even field memory configured to store digital data corresponding to an odd numbered even field among the A / D converted digital data; A second odd field memory for storing digital data corresponding to an even-numbered odd field among the A / D converted digital data; A second even field memory configured to store digital data corresponding to an even number even field among the A / D converted digital data; While storing data on one side between the first odd field memory and the first even field memory, and the second odd field memory and the second even field memory, data stored on the other side is sequentially read out, and the data is read to the read data. An image converter reconstructing the AMA projector image data by adding or subtracting a predetermined amount; It provides a video signal processing apparatus for an AMA projector, characterized in that consisting of a D / A conversion unit for converting the data for the AMA projector reconstructed by the image conversion unit into an analog video signal.

1 is an exemplary view for explaining the interlacing method used in the conventional AMA projector,

2 is a block diagram showing an image signal processing apparatus for an AMA projector according to the present invention;

3 is an exemplary view showing an example of a frame in which an NTSC type interlaced television video signal is converted into a sequential scanning type AMA projector image format.

Explanation of symbols for the main parts of the drawings

100: A / D converter 200: first odd field memory

250: first even field memory 300: second odd field memory

350: second even field memory 400: image converter

500: D / A converter

Advantages and other objects and advantages of the present invention will be more clearly understood by the following description with reference to the attached FIGS. 2 and 3.

FIG. 2 is a block diagram illustrating an image signal processing apparatus for an AMA projector according to the present invention, and FIG. 3 is an NTSC type interlaced television video signal converted into a progressive scan type AMA projector image format according to the present invention. An example diagram showing an example of a frame.

2, the AMA projector image signal processing apparatus according to the present invention includes an A / D converter 100, a first odd field memory 200, and a first even field memory. 250, a second odd field memory 300, a second even field memory 350, an image converter 400, and a D / A converter 500, each of which includes the following functions: Do this.

First, the A / D converter 100 converts each of the R, G, and B color signals extracted from an image signal applied from the outside into digital data based on a predetermined sampling frequency, and then converts each of the converted digital signals. Data is sequentially provided to the first odd / even field memories 200 and 250 and the second odd / even field memories 300 and 350.

Digital data provided from the A / D converter 100 is alternately stored in the first odd / even field memories 200 and 250 and the second odd / even field memories 300 and 350. In the two-odd field memories 200 and 300, 1, 3, 5,. The digital data corresponding to the odd-numbered scan line of is stored, and the first and second even field memories 250 and 350 store 2, 4, 6,... Digital data corresponding to the even-th scanning line of is stored.

The image converter 400 stores data in the second odd field memory 300 and the second even field memory 350, and the data stored in the first odd field memory 200 and the first even field memory 250. ) Alternately read the data stored in the < RTI ID = 0.0 >), and reconstruct the frame for the AMA projector by adding or subtracting the read data to a predetermined amount, and then, the While storing the data, the data stored in the second odd field memory 300 and the data stored in the second even field memory 350 are alternately read, and the AMA projector is added to and subtracted by a predetermined amount. Repeat the frame reconstruction operation. At this time, in the preferred embodiment of the present invention, by configuring the speed of reading data stored in the field memory at least twice as fast as storing the data in the field memory, data is stored in one odd field memory and one even field memory. During storage, data read out from another odd field memory and one even field memory is reconstructed into frames for two AMA projectors.

The D / A converter 500 converts an image frame provided from the image converter 400 to an analog image, and provides the converted analog signal to the display side.

The operation process of the AMA image signal processing apparatus according to the present invention, which is composed of the respective members performing the above functions, will now be described in detail.

First, when a predetermined composite video signal is applied from an external video input device such as a video cassette recorder (VCR) or a personal computer (PC), the applied composite video signal is a predetermined bit rate through an image signal processor (not shown). The composite video signal, which is compressed and encoded, is restored to the original signal before encoding, and the restored video signal is separated into color signals of R, G, and B through a color signal separation unit (not shown). 100).

The present invention is configured in the same manner for each of the image signals of R, G, and B, and the same members configured in each of the R, G, and B perform the same functions, so that the following will be described with reference to R.

The video signal for R provided from the color signal separation unit (not shown) is converted into digital data based on a predetermined sampling frequency through the A / D converter 100. In this case, in the preferred embodiment of the present invention, 525 line 1 frames of the NTSC system are converted into 8-bit line data for each line.

At this time, the digital data corresponding to the first frame of the digital provided from the A / D converter 100 is provided to the first odd field memory 200 and the first even field memory 250, and thus, one frame for NTSC. 1, 3, 5,... Of scanning lines of 525 lines corresponding to. The data corresponding to the odd-numbered scanning lines of is stored in the first odd field memory 200, and 2, 4, 6,... Data corresponding to even-numbered scan lines of is stored in the first even field memory 250.

Thereafter, 1, 3, 5,... Of digital data corresponding to the second frame. While sequentially storing the first order line data in the second odd field memory 300, the image converter 400 alternates the digital data stored in the first odd field memory 200 and the second odd field memory 250. Read by subtracting by the predetermined amount (K) from the read data.

That is, the first line data L1 stored in the first odd field memory 200 is subtracted by K to read L1-K, and the second line data L2 stored in the first even field memory 250 is next. Subtracts by K and reads L2-K, subtracts K from the third line data L3 stored in the first odd field memory 200, and reads out L3-K by repeating the operation of L1-K to L525. Reconstruct a frame for one AMA projector consisting of line data of K. At this time, in the preferred embodiment of the present invention, since the speed of reading the data stored in the field memory is configured to be twice or more the speed of storing the data in the field memory, the data stored in the first odd field memory 200 is stored. During this time, one frame for the AMA projector will be configured.

Thereafter, 2, 4, 6,... Of digital data corresponding to the second frame. While sequentially storing the first even line data in the second even field memory 350, the image converter 400 alternates the digital data stored in the first odd field memory 200 and the second odd field memory 250. The data is read by using a predetermined amount M added from the read data. In this case, K and L may be configured with the same value, or may be configured differently.

That is, M is added to the first line data L1 stored in the first odd field memory 200 and read out as L1 + M, and the second line data L2 stored in the first even field memory 250 is next. Adds M to L2 + M, and adds M to the third line data L3 stored in the first odd field memory 200 to read L3 + M and repeats the operation of L1 + M to L525. Reconstruct a frame for one AMA projector consisting of + M line data. At this time, in the preferred embodiment of the present invention, since the speed of reading data stored in the field memory is configured to be twice or more than the speed of storing data in the field memory, the data is stored in the first even field memory 250. Frame for one AMA projector will be configured.

Thereafter, the image conversion unit 400 repeats the above-described operation, and when the A / D conversion unit 100 provides data for the NTSC 1 frame of the interlaced scanning method, the D / A frames of two AMA projectors are D / A. It will be provided to the conversion unit 500.

The D / A converter 500 converts an AMA projector frame provided as digital data from the image converter 400 into an analog signal and provides the converted signal to a display side. At this time, the display side will be an AMA panel (not shown) consisting of M × N (M and N are natural numbers) unit pixels (not shown).

As described above, using the AMA projector image signal processing apparatus according to the present invention, there is an effect that can provide a clearer image quality.

Claims (2)

An image signal processing apparatus of an AMA projector for converting an image signal provided by interlaced scanning for each of R (Red), G (Green), and B (Blue) into an image signal for a sequential scanning AMA projector, An A / D converter for converting each of the R, G, and B color signals into digital data based on a predetermined sampling frequency; A first odd field memory for storing digital data corresponding to an odd-numbered odd field among the A / D converted digital data; A first even field memory configured to store digital data corresponding to an odd numbered even field among the A / D converted digital data; A second odd field memory for storing digital data corresponding to an even-numbered odd field among the A / D converted digital data; A second even field memory configured to store digital data corresponding to an even number even field among the A / D converted digital data; While data is stored on one side between the first odd field memory and the first even field memory, and the second odd field memory and the second even field memory, data stored on the other side is sequentially read, and the read data is read. An image converter reconstructing the AMA projector image data by adding or subtracting a predetermined amount; And a D / A converter for converting the AMA projector data reconstructed by the image converter into an analog image signal. The image signal processing apparatus of claim 1, wherein the image conversion unit is configured to read the data at a speed of 2 times or more of a speed at which data is stored in the field memory.