KR100264803B1 - Entire screen display apparatus in implementing digital zoom - Google Patents

Abstract

PURPOSE: A total screen display device during a digital zoom is provided to additionally display a total screen other than a digital zoom screen according a digital zoom operation in a digital video camera. CONSTITUTION: A digital signal processor(500) processes a picked-up signal to an image signal according to a television transmission method. A digital zoom processor(600) digital-zooms an image signal from the digital signal processor(500). The digital zoom processor(600) includes the first memory and a linear interpolating section. A down sampling section(640) down-samples the image signal from the digital signal processor(500). The second memory stores the image signal from the down sampling section(640). A memory controller(630) controls accesses of the memories. A switching section(660) is switched according to an input switching control pulse and connects the digital zoom processor(600) and the second memory to a display section. A microcomputer(800) controls the memory controller(630) and a generating timing of a switching control pulse.

Description

Full screen display device when implementing digital zoom

The present invention relates to a digital video camera, and more particularly, to an apparatus capable of displaying not only an enlarged screen according to a digital zoom implementation but also an entire screen to be photographed.

The digital video camera is mainly composed of a digital video camera unit and a VCR unit, and is equipped with various additional functions to meet the needs of consumers. Such additional functions include a digital image stabilizer (DIS) function using a field memory or a digital zoom function. The digital zoom function refers to obtaining a zooming effect by extending a vertical or horizontal picture to an aspect ratio by a linear interpolation method. For example, if you set 4x digital zoom, you can digitally zoom up to 64x with 16x optical zoom.

However, when the digital zoom ratio is set to be high to shoot a specific part, the part that is being shot is forgotten even though the part to be photographed is checked despite the zooming in the wide angle state. May occur. Therefore, when implementing a high-magnification digital zoom in a digital video camera, a PIP (Picture In Picture) function is required to display which part of an image is enlarged.

Accordingly, an object of the present invention is to provide an apparatus capable of additionally displaying an entire screen other than the digital zoom screen according to the digital zoom in a digital video camera.

The present invention for achieving the above object is a full-screen display device of a digital video camera,

A digital signal processor for signal-processing and outputting the picked-up signal into a video signal according to a television transmission method;

A digital zoom processing unit having a first memory and a linear interpolation unit for digital zooming an image signal output from the digital signal processing, a down sampling unit for down-sampling and outputting an image signal output from the digital signal processing unit;

A second memory for storing an image signal output from the down sampling unit;

A memory controller for controlling access of the memories;

A switching unit connecting the output terminal of the digital zoom processor and the second memory to an input of a display unit by switching according to an input switching control pulse;

And a controller for controlling generation timing of the switching control pulse and the memory control unit according to the digital zooming command and the full screen down sampling command.

1 is a block diagram of a digital video camera showing a signal transmission path until an image signal photographed through a lens unit is displayed according to an embodiment of the present invention.

2 is a detailed configuration and peripheral block diagram of the digital zoom processor 600 in FIG.

3 is an exemplary view of a display screen according to an embodiment of the present invention.

Hereinafter, an operation of a digital video camera according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are denoted by the same numerals wherever possible. In addition, a detailed description of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a block diagram of a digital video camera showing a signal transmission path until an image signal photographed through a lens unit is displayed according to an exemplary embodiment of the present invention, and FIG. 2 is a digital zoom processor 600 of FIG. ) Shows a detailed configuration and surrounding block diagram.

First, referring to FIG. 1, the lens unit 100 includes a zoom lens, a focus lens, an aperture, and the like. The zoom lens is a lens that is moved back and forth in the optical axis direction by a zoom motor to enlarge and reduce the magnification of the subject, and the focus lens is used as a lens that focuses the subject by moving back and forth in the optical axis direction by the focus motor. The aperture is opened and closed by driving of the aperture motor to adjust the amount of incident light. The CCD (Charge Coupled Device) 200 converts and outputs the optical signal of the subject passing through the lens unit 100 into an electrical signal (imaging image signal), and the CDS / AGC (Correlated Double Sampling / Auto Gain Control) 300 ) Are correlated double sampling, automatic gain adjustment and shading correction for output. An analog to digital converter (ADC) 400 converts an analog signal output from the CDS / AGC 300 into digital data and outputs the digital data. Digital signal processor (DSP) 500 outputs one field of digital image data output from ADC 400 by NTSC (National Television System Committee) or PAL (Phase Alternation by Line) image signal (Y, C). Process the output to the digital zoom processor 600. The digital zoom processing unit 600 is used to further enlarge a specific portion under the control of a microcomputer (not shown), which is a system control unit, separate from the optical zooming by the driving of the lens unit 100. On the other hand, the image data output from the digital zoom processor 600 is then applied to the display unit and the VCR (Video Cassette Recorder).

Hereinafter, referring to FIG. 2 showing the detailed configuration of the digital zoom processing unit 600 and the peripheral block configuration, the connection relations between the components required to display the entire screen when the digital zoom is implemented according to an embodiment of the present invention will be described. Let's look at it.

First, in the configuration of FIG. 1, components such as a microcomputer for controlling each unit and a timing generator for generating timing signals required for operation of each unit under the control of the microcomputer are omitted in order to facilitate understanding of the signal transmission path. Figures are attached to these components to help the understanding of the present invention. Referring to FIG. 2, the DSP 500 processes digital video data of one field output from the ADC as an NTSC or PAL video signal (Y, C) and outputs the digital video data to the digital zoom processor 600. The video signal output as described above is stored in the field memory 610 under the control of the memory controller 630 in the digital zoom processor 600, and only the video signal under the control of the memory controller 630 is read out so that the linear signal is read. The controller 620 is inputted to the executive unit 620 to be enlarged and output to match the digital zoom factor. The memory controller 630 is controlled by the microcomputer 800 and controls the access of the field memory. The down sampling unit 640 down-samples an NTSC or PAL video signal output from the DSP 500 and outputs a video signal having a reduced size to the memory 650. The memory 650 that stores the down-sampled video signal outputs the entire screen stored under the control of the memory controller 630. The switching unit 660 is switched by the switching control pulse output from the timing generator 820 to output the linearly interpolated enlarged screen and the entire screen to the display unit 830 as a PIP image. The microcomputer 800 is a main controller of a digital video camera and includes a memory including a ROM for storing a control program according to an embodiment of the present invention and a RAM for temporarily storing data generated during a control operation. The microcomputer 800 controls the overall operation of the digital video camera based on the control program stored in the ROM. The key input unit 810 includes a plurality of function keys such as a function key for implementing digital zoom and a function key for defining the entire screen when the digital zoom is implemented (defined as a down sampling key), and key data according to key manipulation. To generate and output to the microcomputer 800. The timing generator 820 generates and outputs a switching control pulse of a predetermined period under the control of the microcomputer 800.

3 is a diagram illustrating a display screen according to an embodiment of the present invention.

Hereinafter, operations of the digital zoom processor 600 for implementing a general digital zoom and a full screen display when implementing the digital zoom according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3. .

First, it is assumed that the entire screen captured by the lens unit 100 is the same as that of the third (a), and the user inputs the key input unit 810 to enlarge the A portion of the screen displayed as the third (a) at high magnification. When the function key provided at the is pressed, the microcomputer 800 controls the timing generator 820 in response to the switching control pulse for digital zoom. The switching control pulse is applied to the switching unit 660 so that the switch SW is connected to the terminal a. In addition, the microcomputer 800 controls the memory controller 630 according to the digital zoom magnification input from the key input unit 810, so that the memory controller 630 controls only the image signal according to the input digital zoom magnification. Read at 610). The image signal thus read is then interpolated by the linear interpolator 620 and then output to the display unit 830 through the switching unit 660. As a result, the digital zoom screen displayed on the display unit 830 is as shown in FIG. 3 (b).

In this state, when the user presses a down sampling key provided in the key input unit 810 to confirm which portion of the entire screen the current screen displayed on the display unit 830 is enlarged, the microcomputer 800 responds thereto. By controlling the timing generator 820 to generate a switching control pulse for downsampling and displaying the entire screen. This switching control pulse is applied to the switching unit 660, so that the switch SW is connected by switching at the timing defined in the a and b terminals. On the other hand, the video signal photographed through the lens unit 100 is digitally converted by the ADC 400 and input to the DSP 500, the DSP 500 is a digital video data of one field NTSC or PAL video The signal is processed as the signals Y and C and output to the digital zoom processor 600. The image signal output through the signal transmission path is stored in the field memory 610 under the control of the memory control unit 630 in the digital zoom processing unit 600, and the entire screen reduced by the down sampling unit 640. Down sampling data is stored in the memory 650. As such, the image signals and the down sampling data stored in the field memory 610 and the memory 650 are respectively read by the control of the memory controller 630 controlled by the microcomputer 800 to switch the linear interpolator 620. It is output to the unit 660. Accordingly, the image signal according to the digital zoom magnification read out from the field memory 610 is output after being interpolated by the linear interpolator 620, and the switching unit 660 is output from the timing generator 820. The switching is switched by to display the entire down sampled sample in the digital zoom screen enlarged at a high magnification as shown in FIG.

Therefore, the user can easily recognize the current position of the digital zoom screen magnified at high magnification through the entire screen displayed by the PIP.

As described above, the present invention has an advantage that the user can easily and clearly recognize the current position of the digital zoom screen which is enlarged at high magnification by inserting the entire down sampled screen on the digital zoom screen.

Claims (1)

A full-screen display device of a digital video camera, comprising: a digital signal processor for signal-processing a photographed signal into a video signal according to a television transmission method and a first digital zooming process for a video signal output from the digital signal processor; A digital zoom processing unit having a memory and a linear interpolation unit, a down sampling unit for down sampling and outputting the image signal output from the digital signal processing unit, a second memory for storing the image signal output from the down sampling unit, and A memory control unit for controlling accessors of memories, a switching unit connecting the output terminal of the digital zoom processing unit and the second memory to an input unit of the display unit by switching according to an input switching control pulse, a digital zooming command and a full screen down sampling command According to the first memory And a control unit for controlling the timing of generation of the fisherman and the switching control pulses.