KR20000022703A - Apparatus for on screen display in a digital camera - Google Patents

Abstract

PURPOSE: An OSD(On screen display) displayer of digital optic device is provided to emphasize the OSD displaying screen by reducing the luminance of the image screen serving as the background screen. CONSTITUTION: An OSD displayer of digital optic device comprises an image data capture unit(3), an OSD data capture unit(4), a selector, a controller(5) and an image controller(7). The selector reads the image and OSD data from the respective storage units in synchronous to preferentially select the OSD data output image data. The controller controls the selection unit in selecting the OSD function to read the image data, outputs the OSD data selection signal as a read data selection signal, and outputs the signals for displaying the selection output of the OSD data and controlling the luminance level of the background screen relative to the displayed screen.

Description

On-Screen Display (OSD) Display of Digital Optics {Apparatus for on screen display in a digital camera}

The present invention relates to an on screen display (OSD) of a digital optical device having display means such as a TV monitor or an LCD monitor, and emphasizes an OSD image displayed on the display means by reducing a brightness component of a background screen. The present invention relates to an OSD display device.

With the rapid development of digital signal processing technology, a digital camera is generally used as an image input means to a PC, and such a digital camera has a liquid crystal display (LCD), which is a display means for checking a captured image on the camera itself. Also, by connecting a TV or the like as an external display means, it is possible to play back moving and still images.

At this time, the OSD is displayed on the LCD to display the status of various functions of the digital camera, shooting, playback, continuous shooting, zoom, time, shooting mode, number of shots, etc.

There are many methods for displaying the OSD, and in 1998, a patent application filed by the applicant of the present application as a method for implementing the OSD using a memory without using a separate OSD IC to utilize various graphics, fonts, etc. As shown in No. 35861 (name of the invention; an on-screen display (OSD) display device and processing method of digital optics), an apparatus as shown in FIG. 1 may be used.

The configuration of such an OSD display device is

Charge Coupled Device (CCD) 1, Digital Signal Processor (DSP) 2 for digital signal processing of electrical video signals input through CCD 1, DSP unit ( DRAM (3) for capturing and storing the digital video signal output from the 2) and the area corresponding to the storage area of the DRAM (3) according to the position, size, etc. to display the OSD data to display The OSD controller 4 which stores the OSD DRAM 4 and whether the OSD data exists in the area of the OSD DRAM 4 corresponding to the area of the DRAM 3 to be output, and selectively outputs the image and the OSD data. And an encoder 6 for coding the image data output by the selection of the memory control section 5 and outputting the image data to the display means in accordance with the synchronization signal of the display means.

The OSD display device having such a configuration converts light input from the outside through the CCD 1 into an electric image signal, and the converted signal performs a digital signal processing process in the digital signal processing unit 2. Going through.

The digital signal processed image signal is image captured and stored in the DRAM 3 which is an image signal storage means.

In addition, the OSD DRAM 4 stores the OSD data to be implemented in an area corresponding to a position to be displayed, that is, a memory address.

Thereafter, when the OSD function is selected, the memory controller 5 simultaneously reads the data of the DRAM 3 in which the image-captured data is stored and the OSD DRAM 4 in which the OSD data is stored. ) Or to send the captured data to the encoder (6).

The memory controller 5 outputs the OSD data when the OSD data exists in the read region, and outputs the image data when the OSD data does not exist.

At this time, the memory controller 5 reads data from the DRAM 3 and the OSD DRAM 4 in synchronization with each other and performs a comparison process.

When the memory size of the DRAM 3 and the OSD DRAM 4 are the same, the memory size may be read in the address order. If the memory size of the OSD DRAM 4 is about 1/2 of the DRAM 3, the DRAM ( When reading the area of 3) once, the OSD DRAM 4 reads and processes the same address twice.

The encoder 6 codes the data selectively outputted from the memory control unit 5 as described above and outputs image data in synchronization with the display means, thereby displaying the OSD in the corresponding area.

As the OSD data is output in this way, it is difficult to distinguish between the OSD screen and the background screen if the brightness of the OSD screen and the background screen to be displayed are similar.

In representing an image (including an OSD) on a screen, a chroma component and a luminance component are required. Since a human visual characteristic is more sensitive to luminance components than colors,

In the present invention, the brightness component of the background screen is reduced so that the OSD screen can be seen more clearly.

1 is a block diagram showing a configuration of an on-screen display display device of digital optics using OSD memory means;

Figure 2 is a block diagram showing the configuration of an on-screen display (OSD) display device of the digital optical device to which the present invention is applied.

Fig. 3 is a block diagram showing the construction of an apparatus having the image adjusting means of the first embodiment according to the present invention.

4A is a diagram showing a screen display state in which all regions other than the OSD display region are the background region in the first embodiment of the present invention;

4B illustrates a screen display state in which a predetermined area is designated as a background area from an OSD display area according to the first embodiment of the present invention.

Fig. 5 is a block diagram of a device having the image adjusting means of the second embodiment of the present invention.

Fig. 6 is an internal timing diagram for explaining the operation of the black dot generator in the second embodiment of the present invention.

According to an aspect of the present invention, there is provided an image display apparatus of a digital optical apparatus that captures and stores digital signal processed image data, and reads the stored image data to display an image on the display means in accordance with a synchronization signal of the display means.

Image data storage means for storing the captured image data;

OSD data storage means for storing OSD data to be displayed;

Selection means for reading out the image data and the OSD data from each of the storage means in synchronization and selecting the output image data by giving priority to the OSD data;

When selecting the OSD function, the selection means is controlled to read image data, and as the read data selection signal, to output the OSD data selection signal, to display the selective output of the OSD data and the brightness component level of the background screen compared to the display screen of the OSD data. Control means for controlling each unit by outputting a signal for adjustment control;

Recognizing the selection signal of the data input from the control means and outputs the OSD data as it is, when the OSD data is input with an area other than the position where the OSD data is displayed, and the background area where the image data is input is the brightness component. And image adjusting means for reducing and outputting the level by a predetermined value.

Referring to the embodiment of the accompanying drawings, the invention characterized by such a configuration as follows.

FIG. 2 is a block diagram of an apparatus to which the present invention is applied, and FIG. 3 is a detailed block diagram showing the first embodiment in the apparatus, and descriptions of the same parts as in the prior art will be repeated with the same reference numerals. It will be omitted.

In the OSD display of the digital optical device,

When the OSD function is selected, the image data stored in the DRAM 3 and the OSD data of the OSD DRAM 4 are read in synchronization, and the OSD data output from the OSD DRAM 4 is first selected through a comparison process. And as an OSD enable signal (OSD_EN) applied from the memory control unit (5 ') and a memory control unit (5') which outputs the OSD enable signal (OSD_EN) as a selection signal of the currently output image data. An image controller 7 and a memory controller 5 'that recognize the input image data and control the output to the encoder 6 by lowering the predetermined screen brightness level value in the case of the background data other than the OSD data. Recognizes the position where the OSD data is displayed by receiving the OSD enable signal (OSD_EN) output from the screen, and designates a certain area as a block from the position where the OSD data is displayed. It consists of a background area designation part 8 which designates a station.

One embodiment of the present invention having such a configuration is to display the OSD data by selecting the image data, when the OSD data is displayed, to provide a highlighted OSD screen by reducing the screen brightness of other areas,

First, when the user selects an OSD function, the memory controller 5 'reads the image data in synchronization with the DRAM 3 storing the captured image data and the OSD DRAM 4 storing the OSD data.

As described above, the memory controller 5 'reads and outputs OSD data if OSD data exists.

In this way, the image adjusting unit 7 receives the image data input from the memory control unit 5 'in response to the control of the memory control unit 5' when the OSD function is selected. Reduces the screen brightness component by the predetermined screen level value and outputs it, and in the case of the OSD area where OSD data is displayed, outputs the current level value to the encoder 6 as it is.

The image adjusting unit 7 recognizes the image data currently input according to the OSD enable signal OSD_EN, which is a selection signal of the image data output from the memory control unit 5 ', and accordingly, the brightness of the image data as described above. You will be adjusting the level.

That is, when the OSD enable signal OSD_EN is input low, the image adjusting unit 7 outputs the screen brightness level by the predetermined screen level value to the encoder 6 and outputs the OSD enable signal OSD_EN. If the value becomes high, the encoder 6 outputs the screen brightness level value of the current data as it is.

At this time, when the user wants to set only a certain area as the background area from the area where the OSD is displayed, the memory controller 5 'controls the background area designation unit 8 to block a certain area from the area where the OSD is displayed. It is assigned to the background area,

The background area designation unit 8 receives the OSD enable signal OSD_EN from the memory controller 5 'to recognize the position where the OSD data is to be displayed, and designates a predetermined block as the background area from the recognized position. The adjustment unit 7 informs the position thereof, and the image adjustment unit 7 receives this data and reduces the brightness level of the image data excluding the OSD data in the background area designated by the background area designation unit 8 to encode the encoder. Will output to (6).

That is, in the state where the function of the background region designation unit 8 is not executed, the OSD region is emphasized by using the entire area except the OSD region as the background region as shown in FIG. 4A, and the background region designation unit 8 is operated. In this case, as shown in FIG. 4B, the background area is designated from the OSD area to a predetermined area to perform the OSD area emphasis operation as described above.

As such, the operation of causing the data other than the OSD to lower the brightness level to emphasize the OSD screen is performed according to the user's selection when selecting the OSD function.

In addition, the feature provided in this embodiment allows the user to adjust the reduced screen brightness level value according to the key input.

In addition, in the embodiment of the present invention as described above, by further comprising a calculation means, by selecting the automatic function instead of the screen brightness level value input by the user to compare with the brightness level of the OSD screen to be displayed accordingly By calculating the screen brightness level value to be reduced, the screen brightness level of the background area may be determined according to the result value to be calculated by the calculation means.

On the other hand, Figure 5 is a second embodiment of the present invention, by generating a black dot (Black dot) according to a certain period, it is to reduce the overall screen brightness of the background area,

In the OSD display of the digital optical device,

Image data stored in DRAM 3 and OSD DRAM 4 are read and compared to determine whether image data I_Y, I_Cr, I_Cb or O_Y, O_Cr, O_Cb is output, and the output image Memory control unit 5 for outputting the black dot enable signal Black dot_EN according to the OSD enable signal OSD_EN and the black dot enable period set to adjust the brightness of the screen as the data selection signal. And the luminance signal (Y) and the color signal (Cr, Cb) of the pixel according to the black dot enable signal (Black dot_EN) and the OSD enable signal output from the memory controller 5 '. The configuration of the embodiment of the present invention includes a black dot generator 7 which is set to a black level and outputs to the encoder 6.

According to the embodiment of the present invention having such a configuration, when the data of the background area, that is, the data of the screen is output from the memory controller 5 ', the black dot enable setting cycle is performed to reduce the brightness of the screen. Therefore, the luminance signal (Y) and the color signals (Cr, Cb) of the corresponding area are set to the black level,

When OSD data is being output, the encoder 6 outputs the set OSD data value as it is without generating a black dot.

FIG. 6 is a diagram illustrating an internal timing for explaining the operation of the black dot generator 7 according to an embodiment of the present invention. Referring to FIG. 6, an embodiment of the present invention will be described below. .

First, as shown in FIG. 4, when the black dot enable signal Black dot_EN is high, the luminance signal Y 'and the color signals Cb' and Cr 'outputted to the encoder 6 are image data. (I_Y, I_Cb, I_Cr) are output as is,

Each time it falls to a low, Y '= 16, Cb' = 80 and Cr '= 80, which are represented in hexadecimal which is a value representing the black level, are outputted to the encoder 6, respectively.

In the above example, the brightness of the screen is set by dropping the black dot enable signal (Black dot_EN) once every three pixels, and the period of the black dot enable signal (Black dot_EN) is set by the user. It can be selectively adjusted by setting the brightness of the to an appropriate value.

However, when the OSD enable signal OSD_EN indicating that the OSD data (O_Y, O_Cb, O_Cr) is currently output from the memory controller 5 'is input, i.e., rises high, the black dot generator 7 When the black dot enable signal Black dot_EN falls low, the black dot is not generated and the OSD data value is output to the encoder 6 as it is.

That is, in the image area, the corresponding pixel is set to the black level according to the black dot enable period, and in the OSD area, the original OSD data value is output as it is.

Therefore, since the brightness of the entire screen of the image area that is the background of the OSD area is reduced, the brightness of the OSD area of the background area is increased, thereby obtaining the emphasis effect of the OSD.

At this time, if the black dot is generated as shown in the above drawings, the black dot is generated at a predetermined position, so that a straight black line occurs vertically on the screen.

After the display of one line is finished, the memory controller 5 'shifts the black dot enable signal Black dot_EN by one clock CLK to output the black dot enable signal to the black dot generator 7. Prevent black lines from appearing.

As described above, in displaying the OSD, the brightness of the image screen serving as the background of the OSD is reduced, so that the effect of highlighting the OSD display can be obtained.

In addition, since the OSD can be automatically adjusted according to the brightness of the OSD screen, or the user can adjust the period of the screen level value or the black dot enable signal, the degree of brightness reduction of the image screen can be adjusted according to the brightness of the OSD screen.

Claims (7)

Image data storage means for storing the captured image data; OSD data storage means for storing OSD data to be displayed; Selection means for reading out the image data and the OSD data from each of the storage means in synchronization and selecting the output image data by giving priority to the OSD data; When selecting the OSD function, the selection means is controlled to read image data, and as the read data selection signal, to output the OSD data selection signal, to display the selective output of the OSD data and the brightness component level of the background screen compared to the display screen of the OSD data. Control means for controlling each unit by outputting a signal for adjustment control; Recognizing the selection signal of the data input from the control means and outputs the OSD data as it is, when the OSD data is input with an area other than the position where the OSD data is displayed, and the background area where the image data is input is the brightness component. And on-screen display (OSD) display of digital optics, characterized in that it comprises image adjusting means for reducing the level by a predetermined value. The apparatus of claim 1, further comprising: a background area designation means for recognizing the OSD data selection signal and designating a background area for reducing a screen brightness component level in the image adjustment means by designating a predetermined area as a block from the position of the OSD data; An on-screen display (OSD) display of digital optics, characterized in that further comprises. 2. The digital optical apparatus as claimed in claim 1, wherein the screen brightness component level value of the image adjusting means further comprises computing means for calculating a predetermined ratio from the brightness level of the display screen of the OSD data. Screen Display (OSD) Display. The image adjusting unit of claim 1, wherein the image adjusting unit receives a black level enable control signal according to a black level setting period, and sets the luminance signal and the color signal of the corresponding pixel to a black level to reduce the overall screen brightness of the background screen. On-screen display (OSD) display device of the digital optical device characterized in that the. The method according to any one of claims 1 to 5, wherein the OSD is displayed so that the user can selectively determine whether to execute the image adjusting means for adjusting the screen brightness in the background area. On-screen display (OSD) display device of the digital optical device further comprising on / off key input means. 7. The key input means according to any one of claims 1, 2, and 6, wherein a level setting value or a black level setting period for determining a degree of screen brightness reduction in the image adjusting means can be adjusted according to a user's selection. On-screen display (OSD) display device of the digital optics further comprising. 5. The on-screen display (OSD) display of digital optics according to claim 4, wherein the black level setting period is such that the display of the next line is executed after a predetermined clock shift when the display of one line on the screen is completed. .