KR970004389B1 - Electronic zooming device for a camera - Google Patents

Abstract

An electronic zoom system is disclosed. The electronic zoom system comprises a line memory unit(41) for storing Y signal and C signal; a microcomputer(37) for controlling the line memory unit(41) and determining a vertical and a horizontal coefficients according to the zoom magnification; a first and a second vertical interpolating unit(36,38) for processing the Y signal and the C signal from the line memory(41) and the vertical coefficient from the microcomputer(37); and a first and a second horizontal interpolating unit(39,40) for processing the Y signal and the C signal from the line memory(41) and the horizontal coefficient from the microcomputer(37).

Description

Electronic zoom device

1 is a configuration diagram of a conventional camera system,

2 is a configuration diagram of a camera system to which the present invention is applied,

3 is a configuration diagram of an electronic zoom device according to the present invention;

4A and 4B are structural diagrams showing a line memory data processing process according to the present invention;

5 is an output signal waveform diagram of FIG.

* Description of the symbols for the main parts of the drawings *

1,11 Lens 2,12 CCD and CDS

3,13: A / D converter 4: Field memory

5,20: Electronic zoom device 6,16,17: D / A converter

7: AGC and Gamma Corrector 8: Y / C Separator

9: Video signal generator 14,31: DSP

15 Encoder 18 CCD Time Controller

19: Synchronization signal generator 21,37: Microcomputer

32 to 35,42 to 46: line memory

36,38: vertical interpolator 39,40: horizontal interpolator

41: line memory

The present invention relates to an electronic zoom device, and more particularly, to an electronic zoom device using a line memory instead of a field memory.

1 is a configuration diagram of a conventional camera system. Referring to FIG. 1, the structure and operation of the conventional camera system will be described below.

The conventional camera system converts an image from the lens 1 through the CCD (Charge Coupled Device) and the CDS (Correlative Double Sampling) 2 into an A / D (Analog / Digital) converter 3 as shown in FIG. After the conversion, the image data stored in the field memory 4 is read out as a vertical image to be stored in the field memory 4 and the electronic zoom processor 5 performs the electronic zoom process. After zooming, D / A conversion of the zoomed image data is performed in a D / A (Digital / Analog) converter 6 and processed in an AGC (Auto Gain Controller) and a gamma (γ) corrector (7). It is configured to separate the Y / C signal from the Y / C separator (8) and to output the video signal of the camera unit through a composite signal generator (9).

However, the conventional camera system has a problem that the chip area is wider and the power consumption is larger because the field memory is used.

An object of the present invention is to provide an electronic zoom device for improving chip area efficiency, reducing power consumption, and improving image quality by using a line memory instead of a field memory.

In order to achieve the above object, the present invention controls the line memory means to which the Y signal and the C signal separated by signal processing are stored, and controls the line memory means and determines and outputs the vertical coefficient and the horizontal coefficient according to the zoom magnification. Y and Y signals output from the line memory means and the first and second vertical interpolation means for calculating and outputting the vertical coefficients output from the microcomputer, respectively, and Y output from the first and second vertical interpolation means. And first and second horizontal interpolation means for calculating and outputting the signal and the C signal with the horizontal coefficient output from the microcomputer, respectively.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

2 is a configuration diagram of a camera system to which the present invention is applied, FIG. 3 is a configuration diagram of an electronic zoom device according to the present invention, and FIGS. 4A and 4B show a line memory data processing process according to the present invention. FIG. 5 shows waveforms of the output signal of FIG.

The camera system to which the present invention is applied has a lens 11, a CCD and a CDS 12, an A / D converter 13, a DSP 14, an encoder 15, and a D / A converter as shown in FIG. 16, 17, CCD time controller 18, synchronization signal generator 19, electronic zoom device 20, and microcomputer 21.

First, the light entering through the lens 11 is converted into an electrical signal through the CCD and the CDS 12, double sampled, and then converted into a digital signal by the A / D converter 13.

The digital signal is signaled by the SCP 14 and separated into a Y signal and a C signal, and sent to the electronic zoom device 20.

The Y signal and the C signal input to the electronic zoom device 20 are stored in respective line memories and then input to the encoder 15 through a calculation process, and the D / A converters 16 and 17 transmit the D / A signals. It is converted and output as a composite video signal which is a composite signal.

The electronic zoom device 20 according to the present invention comprises a line memory section 41, a vertical interpolation section 36, 38, a horizontal interpolation section 39, 40, and a microcomputer 37 as shown in FIG. It is composed.

The line memory unit 41 connects 2H line memories 33 and 35 to 1H (Horigental) line memories 32 and 34 to which the Y and C signals output from the DSP 31 are input, respectively. The 2H line memories 33 and 35 are connected to the vertical interpolators 36 and 38, respectively.

The Y signal and the C / signal output from the DSP 31 are stored in the 1H line memories 32 and 34 and the 2H line memories 33 and 35, and the vertical interpolation unit is controlled by the microcomputer 37. (36,38), respectively, the vertical interpolation unit (36,38) is calculated by calculating the output coefficient with the vertical coefficient value according to the magnification determined by the microcomputer 37 to the horizontal interpolation unit (39, 40) The horizontal interpolators 39 and 40 calculate data output from the vertical interpolators 36 and 38 with horizontal coefficient values according to the magnification determined by the microcomputer 37 and output the data to the encoder 15. do.

That is, the Y signal and the C signal output to the encoder 15 are values calculated according to the respective zoom magnifications, and the microcomputer 37 determines the vertical coefficients and the horizontal coefficients according to the zoom magnification, and the vertical Output to the interpolators 36 and 38 and the horizontal interpolators 39 and 40.

The data processing of the line memory according to the present invention will be described with reference to FIGS. 4A, 5B, and 5 as follows.

As shown in FIG. 4A, the line memory unit 41 includes two 1H line memories 42 and 43 having a 1K byte capacity and one 2H line memory 44 having a 1K byte capacity. As shown in Fig. 4 (b), one 1H line memory with a capacity of 1.5K bytes and one 2H line memory 46 with a capacity of 1K bytes is formed.

First, referring to the data processing of the line memory shown in FIG. 4A, after simultaneously performing read and write operations on the 1H line memory 42, the write operation is continuously performed on the 1H line memory 43. A read operation is performed on the 1H line memory 42 and sent to the 2H line memory 44.

Then, the write operation is performed on the 1H line memory 42 again, and at the same time, the read operation is performed on the 1H line memory 43 to simultaneously perform the read and write operations on the 2H line memory 42, and then 0.5. During the H, the write and read operations are repeatedly performed alternately to the 1H line memory 43 and the 1H line memory 42.

The data stored in the 1H line memories 42 and 43 are alternately stored in the 2H line memories 44 and then output to the vertical interpolators 36 and 38.

Referring to the data processing process of the line memory of FIG. 4 (b), after simultaneously reading and writing data in the 1H line memory 45, the write operation is performed from 301 to 17F and simultaneously the read operation is performed. From address ○○ to 1H line memory 45 is completed, 768 pieces of data are sent to 2H line memory 46.

Next, the write operation is performed from address 180 to 47F, and the read operation is performed from address 301 to 17F at the same time, and the data previously existing in the 2H line memory 46 is transferred to the 2H line memory 46. Output to the vertical interpolation unit (36,38).

That is, the read and write operations are simultaneously performed to the 1H line memory 45 for the first 1H, and the data written for the previous 0.5H for the next 0.4H is read out to the 2H line memory 46, and then The data written in the previous 0.5H for 0.5H is read and output to the 2H line memory 46, and the write operation is repeatedly performed at the address at which the read operation was performed for the previous 0.5H.

By repeating the above operation, even if the 1H line memories 42 and 43 with 2K bytes of capacity are replaced with the 1H line memories 45 with 1.5K bytes of capacity, the capacity of the line memory can be reduced.

The data output to the 2H line memories 44 and 46 by the above operation is as shown in FIG.

The present invention configured and operated as described above has an application effect of reducing chip area, power consumption, and memory capacity by using a line memory.

Claims (7)

A microcomputer 37 for controlling the line memory means 41 and the line memory means 41 in which the Y and C signals separated by signal processing are input and stored, and determining and outputting the vertical coefficient and the horizontal coefficient according to the zoom magnification. ), First and second vertical interpolation means 36 and 38 for calculating and outputting the Y and C signals output from the line memory means 41 with the vertical coefficients output from the microcomputer 37, and the First and second vertical interpolation means 39 and 40 for calculating and outputting the Y and C signals output from the first and second vertical interpolation means 36 and 38, respectively, with the horizontal coefficient output from the microcomputer 37, respectively. Electronic zoom device, characterized in that consisting of). 2. The electronic zoom device according to claim 1, wherein said line memory means (41) comprises two line memory sections having the same structure in which the Y signal and the C signal are respectively stored. 3. The line memory unit of claim 2, wherein the line memory unit receives first and second 1H line memories 42 and 43, which are alternately inputted with a Y signal or a C signal, and writes and reads, and the first and second 1H lines. And an 2H line memory (44) connected to the memory (42,43) to alternately store and output data of the first and second 1H line memories (42,43). The 1H line memory 45 of claim 2, wherein the line memory unit is connected to the 1H line memory 45 and the 1H line memory 45, in which write and read operations are alternately performed by inputting a Y signal or a C signal. And a 2H line memory (46) which alternately stores and outputs data of the line memory (45) according to the address. 4. The electronic zoom device according to claim 3, wherein the first and second 1H line memories (42,43) are composed of a line memory having a capacity of 1K bytes. 5. Electronic zoom device according to claim 3 or 4, characterized in that the 2H line memory (44,46) consists of a line memory having a capacity of 1K bytes. 5. The electronic zoom device according to claim 4, wherein the 1H line memory (45) comprises a line memory having a capacity of 1.5K bytes.