KR100403805B1 - A stereoscopic image processor and a method thereof - Google Patents

Abstract

PURPOSE: An apparatus and a method for processing a stereoscopic image signal are provided to process three-dimensional image signals in real time by making three-dimensional image signals into double field signals, and compounding right and left images of the double field signals. CONSTITUTION: An RGB image and synchronous signal separator(1) separates RGB image and synchronous signals from three-dimensional image signals. An analog-to-digital converter(2) converts the RGB image signals into digital right/left eye image signals. A plurality of field memories(3) store the digital right/left eye image signals by fields in order according to reading/writing control signals. First and second digital multiplexers(4) reverse polarity of right and left eye double field signals read from the field memories according to clock signals, and mix the right and left eye double field signals by fields for outputting a frame image signal repeating right eye field and left eye field signals. A digital switch(5) selectively outputs the frame image signal for forming right and left eye three-dimensional image signals. A control signal generator(6) generates the reading/writing control signals, the clock signals, and selection control signals.

Description

[0001] The present invention relates to a stereoscopic image processor and a method thereof,

The present invention relates to a stereoscopic image processor and method, and more particularly, to an apparatus and method for processing a stereoscopic image signal to be applied to a non-eye-hardened stereoscopic liquid crystal display employing a lenticular lens.

In developing the stereoscopic image display, stereoscopic image signals have not yet been standardized yet. However, the specifications of NTSC and PAL, which are widely used in the current broadcasting system, are maintained and the image signals are recorded by two cameras Mainly used. Particularly, in a conventional three-dimensional image signal processing method for processing a video signal to be applied to a three-dimensional display of a lenticular system, a three-dimensional image signal coded by two video cameras and a NTSC system is generally used by a microprocessor It is using the method of processing.

However, such a method is very inadequate to lighten the product, and in a display such as a liquid crystal TV, it is somewhat difficult to process the image in real time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stereoscopic image signal processing apparatus and method of a lenticular system capable of real time processing and lightening in a liquid crystal display.

According to an aspect of the present invention, there is provided a stereoscopic image signal processing apparatus for implementing a three-dimensional image in a lenticular three-dimensional liquid crystal display, the three-dimensional image signal coded by any one of an NTSC system and a PAL system An RGB image and synchronizing signal separating means for separating a synchronizing signal and an RGB image signal from the three-dimensional image signal of either the NTSC system or the PAL system; Analog / digital converting means for converting the RGB video signal separated from the RGB video and synchronizing signal separating means into a digital video signal; At least four field memories for sequentially storing the digital right-eye and left-eye image signals provided from the analog / digital conversion means in units of fields according to a write / read control signal; The left and right dual field signals read out from the field memories are mixed in pixel units while polarity inversion is performed in accordance with the liquid crystal display characteristic in accordance with the clock signal to output a frame image signal in which the left eye field signal and the left eye field signal are repeated First and second digital multiplexers; Digital switching means for selectively outputting a frame image signal provided from the first and second digital multiplexers according to a selection control signal to form a left and right three-dimensional image signal; And a control signal generating means for generating the write / read control signal, the clock signal, and the selection control signals using the synchronization signal separated from the RGB video and sync signal separation means.

In the present invention, the field memory includes a write enable unit and a read enable unit corresponding to the write / read control signal, respectively, and the digital switching unit, when the selection control signal is a positive pulse It is preferable that the output signal of the first digital multiplexer is selected and the output signal of the second digital multiplexer is selected when the selection control signal is a negative pulse or vice versa.

According to another aspect of the present invention, there is provided an apparatus and method for controlling an NTSC system and a digital signal processor, the system including field memories, digital multiplexers, digital switching means and control signal generating means, Dimensional image signal of one of the NTSC system and the PAL system is converted into a three-dimensional image signal for a liquid crystal display, To a digital three-dimensional image signal; (B) sequentially storing the digital right-eye and left-eye image signals converted in the step (a) in the field memory in units of fields in accordance with a write / read control signal, Forming each frame using a plurality of pixels; (C) The left-eye and right-eye dual-field signals read out in the step (b) are mixed by the digital multiplexers in units of pixels while polarity inversion is performed by the digital multiplexers so as to match the liquid crystal display characteristics and the left-eye field signal and the left- Generating a frame video signal; And (d) selectively outputting the frame image signal generated in the step (c) by the digital switching means to form a left and right three-dimensional image signal.

In the present invention, the steps (b), (c) and (d) may be performed by using the write enable signal, the read enable signal, the clock, and the selection control signal provided by the control signal generating means .

1 is a schematic block diagram of a stereoscopic image signal processing apparatus for a lenticular system for a liquid crystal display according to the present invention,

Fig. 2 is a waveform diagram of each sub-signal in Fig. 1. Fig.

Description of the Related Art

1 .... RGB and synchronous signal separation unit

2 .... Analog / Digital (A / D) Converter

3 .... field memories

4 .... Digital Multiplexers

5 .... Digital Switch

6 .... control signal generator

7 .... Digital / Analog (D / A) Converter

Hereinafter, an apparatus and method for processing a stereoscopic image signal according to the present invention will be described with reference to the drawings.

The stereoscopic image signal processing apparatus for a lenticular system for a liquid crystal display according to the present invention forms a three-dimensional image signal coded by an NTSC system or a PAL system in a double field, ), And converts it into a three-dimensional image signal suited to the lenticular system. 1, the stereoscopic image signal processing apparatus includes RGB and synchronous signal separator 1, analog / digital (A / D) converter 2, four field memories 3, A digital multiplexer 4, a digital switch 5, a control signal generator 6, and a digital / analog (D / A) converter 7.

Here, the RGB and synchronizing signal separating unit 1 separates the synchronizing signal and the RGB signal Dna from the three-dimensional image signal of the NTSC or PAL system.

The A / D converter 2 converts an analog NTSC or PAL three-dimensional image signal provided by the RGB and synchronizing signal separator 1 into a digital signal Dnd.

The four field memories 3 are divided into one field of the left eye image 1 and one frame of the right eye image 1 according to the control signals (the write enable signals w1 to w4 and the read enable signals r1 to r4) The first and second field memories FM1 and FM2 write or read video signals of odd-numbered frames, and the third and fourth field memories FM1 and FM2 read / The four field memories FM3 and FM4 write or read video signals of even-numbered frames. In the first and second field memories FM1 and FM2, the first field memory FM1 writes or reads the right eye image field signal among the odd frame signals and the second field memory FM2 writes or reads the left eye image field signal Or vice versa). In the same manner, in the third and fourth field memories FM3 and FM4, the third field memory FM3 writes or reads the right eye image field signal among the even-numbered frame signals, and the fourth field memory FM4 writes the left eye image field signal Read (or, conversely, read or write). In particular, when the field memories FM1, FM2, FM3, and FM4 read the left-eye or right-eye image field signals, the same field image signals are repeatedly read (field double) to form a video signal of one frame. That is, Dndr1, Dndl1, Dndr2, and Dndl2 overlap with left eye or right eye field signals. For example, in the case of VGA, the capacity of the memory requires (640 × 480) × 3 (R, G, B) × 2 (Right, Left) = 1,843,200 addresses, Since the read clock must process 640 × 480 data per 1/60 second, it should have a frequency characteristic of at least 18.4 MHz (= 640 × 480 × 60). Table 1 below shows the requirements of such devices, such as memory and device capacity and minimum clock frequency.

Memory capacity Minimum Clock Frequency VGA 640 x 480 x 3 x 2 = 1843200 640 x 480 x 60 = 18.4 [MHz] SVGA 800 x 600 x 3 x 2 = 2880000 800 x 600 x 60 = 28.8 [MHz] XGA 1024 x 768 x 3 x 2 = 4718592 1024 x 768 x 60 = 47.2 [MHz]

The digital multiplexer 4 mixes the left and right digital video signals according to the control signals (switching clocks clk1 and clk2) provided from the control signal generator 6 and performs polarity inversion according to the characteristics of the liquid crystal display give.

The digital switch 5 selects one of the composite video signal of the first digital multiplexer or the composite video signal of the second digital multiplexer according to the data selection signal sel provided by the control signal generator 6.

The control signal generator 6 generates control signals provided to the field memory 3, the digital multiplexer 4 and the digital switch 5 using the synchronizing signal provided from the RGB and synchronizing signal separator 1, Generates the write enable signals w1 to w4, the read enable signals r1 to r4, the switching clocks clk1 and clk2 of the digital multiplexer 4 and the data selection signal sel of the digital switch 5. [ In particular, the read enable signals r1 to r4 cause two clocks to be continuously generated so that the field video signal stored in the field memory 3 is read twice (see FIG. 2).

The D / A converter 7 converts the digital video signal switched from the digital switch 6 into an analog video signal.

The operation principle of the stereoscopic image signal processing apparatus will be described with reference to Fig.

The RGB and synchronizing signal separating unit 1 receives an analog NTSC (or PAL) system 3 (R, G, B, 60 Hz) Dimensional image data (Dna) and the synchronization signal. The image data (signal) is a color image signal of R, G, and B, but is denoted by Dna as one signal for convenience in FIG. The synchronizing signal is provided to the control signal generator 6 to control the write enable signals w1 to w4 and the read enable signals r1 to r4 of the field memories 3 (FM1 to FM4), the first digital multiplexer and the second digital The switching clocks clk1 and clk2 of the multiplexer, and the data selection signal sel of the digital switch 5. [ These waveforms are shown in FIG. 2, respectively.

Next, the three-dimensional image signals Dna (left and right eye image signals) are converted into three-dimensional image data Dnd of the digital NTSC (or PAL) scheme by the A / D converter 2. That is, as shown in FIG. 2, the right eye field signals R1, R2, ... and the left eye field signals L1, L2, ... appear as repeated digital signals.

The digital three-dimensional image data Dnd is input to the field memory 3 while the frequencies of the write and read clocks of the four field memories 3 are adjusted to 10 to 50 MHz. The write enable input signals w1 to w4 of the first to fourth field memories FM1 to FM4 are applied to the field memories 3 and the first to fourth field memories FM1 to FM4 are driven according to the pulse sequence of the write enable signals W1 to W4. (Recorded) in the order of the image field signals R1, L1, R2, and L2 in the first, second, third, fourth, fifth,

At this time, when the read enable input signals r1 to r4 are applied, video signals such as Dndr1, Dndl1, Dndr2, and Dndl2 are output from the first to fourth field memories FM1, FM2, FM3, and FM4, respectively. These two video signals are output in the form of a field double signal having the same video field signal. This is because two pulses of the read enable signals r1, r2, r3 and r4 are successively outputted from the control signal generator 6, As shown in FIG. Therefore, the first left field signal R1 is overlapped and output (refer to Dndr1) from the first field memory FM1, and the first left field signal L1 is duplicated from the second field memory FM2 (See Dndl1), the second field-of-view field signal R2 is output (see Dndr2) from the third field memory FM3 and the second left-field-field signal L2 is output from the fourth field memory FM4, (See Dndl2).

The left and right double field signals Dndr1, Dndl1, Dndr2 and Dndl2 are mixed in the pixel multiplexers 4 by the switching clocks CLK1 and CLK2. That is, the first right eye dual field signal Dndr1 and the first left eye dual field signal Dndl1 are mixed in accordance with the first switching clock CLK1 in the first digital multiplexer, And the second left eye double field signal Dndr2 and the second left eye double field signal Dndl2 form the image frame signal output Dld1 in which R1 and L1 are repeated in order to polarize the image data in accordance with According to the second switching clock CLK2. The second switching clock serves to polarize the image data in accordance with the characteristics of the liquid crystal display, thereby forming the image frame signal output Dld2 in which R2 and L2 are repeated.

These Dld1 and Dld2 are input to the digital switch 5 and are selected in accordance with the selection signal sel provided from the control signal generator 6. [ For example, as shown in FIG. 2, when the data selection signal sel is high, Dld1 is selected, and when the data selection signal sel is low, Dld2 is selected and Lenticular digital three-dimensional image data Dld. When the analog three-dimensional image data Dld needs an analog image signal depending on the purpose, it is possible to obtain the lenticular analog three-dimensional image data Dla by using the D / A converter 7.

As described above, the apparatus and method for processing a stereoscopic image signal according to the present invention are an apparatus and method for processing a three-dimensional image signal of a lenticular system for a liquid crystal display, in which a three-dimensional image signal coded by NTSC or PAL is converted into a double field dimensional field signal, and by synthesizing the left and right images of the double field, a three-dimensional image signal can be processed in real time, As shown in FIG.

Claims (7)

1. A stereoscopic image signal processing apparatus for implementing a three-dimensional image in a lenticular three-dimensional liquid crystal display, the three-dimensional image signal being coded by any one of an NTSC system and a PAL system, An RGB image and synchronizing signal separating means for separating a synchronizing signal and an RGB image signal from the three-dimensional image signal of either the NTSC system or the PAL system; Analog / digital conversion means for converting the RGB video signals separated from the RGB video and synchronizing signal separation means into digital right eye and left eye video signals; At least four field memories for sequentially storing the digital right-eye and left-eye image signals provided from the analog / digital conversion means in units of fields according to a write / read control signal; The left and right dual field signals read out from the field memories are mixed in pixel units while polarity inversion is performed in accordance with the liquid crystal display characteristic in accordance with the clock signal to output a frame image signal in which the left eye field signal and the left eye field signal are repeated First and second digital multiplexers; Digital switching means for selectively outputting a frame image signal provided from the first and second digital multiplexers according to a selection control signal to form a left and right three-dimensional image signal; And And a control signal generating means for generating the write / read control signal, the clock signal, and the selection control signals using the synchronizing signal separated from the RGB image and the synchronizing signal separating means. . 2. The stereoscopic image signal processing apparatus according to claim 1, wherein the field memory includes a write enable means and a read enable means corresponding to the write / read control signal, respectively. The digital multiplexer of claim 1, wherein the digital switching unit selects an output signal of the first digital multiplexer when the selection control signal is a positive pulse and outputs an output signal of the second digital multiplexer when the selection control signal is a negative pulse. And a signal is selected or vice versa. The stereoscopic image signal processing apparatus according to claim 1, further comprising digital / analog conversion means connected to the digital switching means for converting a digital signal into an analog signal. Dimensional video signals of either the NTSC system or the PAL system using the control signals provided by the control signal generator, A stereoscopic image signal processing method for converting a stereoscopic image signal into a three-dimensional image signal for a liquid crystal display, (A) converting a three-dimensional image signal of either the NTSC system or the PAL system into a digital right eye image and a left eye image signal; (B) sequentially storing the digital right-eye and left-eye image signals converted in the step (a) in the field memory in units of fields in accordance with a write / read control signal, Forming each frame using a plurality of pixels; (C) The left-eye and right-eye dual-field signals read out in the step (b) are mixed by the digital multiplexers in units of pixels while polarity inversion is performed by the digital multiplexers so as to match the liquid crystal display characteristics and the left-eye field signal and the left- Generating a frame video signal; And (D) selectively outputting the frame image signal generated in the step (c) by the digital switching means to form a left and right three-dimensional image signal. 6. The method of claim 5, wherein the steps (b), (c), and (d) further comprise using the write enable signal, the read enable signal, the clock signal, and the selection control signal provided by the control signal generating means And performing the three-dimensional image signal processing on the three-dimensional image signal. The stereoscopic image signal processing method according to claim 5, further comprising a digital / analog conversion step of converting the three-dimensional image signal into an analog signal after the step (d).