KR20120017817A - Image display system with on screen display function - Google Patents

Abstract

PURPOSE: An image display system with an on screen display function is provided to eliminate a need of an additional non volatile memory for saving an image for an on screen display. CONSTITUTION: An MCU(Micro Controller Unit)(11) stores pixel data of a bitmap image for an on screen display in a user program area. A register(12) successively receives pixel data of the bitmap image from the MCU. A level checking unit(143) checks that pixel data of a bitmap image inputted to the register are updated. A volatile memory(13) stores updated pixel data. An image combining unit(142) combines the pixel data with a background image.

Description

IMAGE DISPLAY SYSTEM WITH ON SCREEN DISPLAY FUNCTION}

The present invention relates to an image display system having an On Screen Display (OSD) function, and more particularly, does not require an additional nonvolatile memory for storing a bitmap image for the OSD. The present invention relates to an image display system having an OSD function to implement an OSD by minimizing unnecessary effects on a background image input from a camera.

In general, in order to implement an On Screen Display (OSD), a nonvolatile memory for storing bitmap images for an OSD is provided in an image display system. That is, an image display system having an OSD function stores bitmap images for OSD in a nonvolatile memory such as a ROM or a flash memory, and uses the OSD bitmap images by reading them from the nonvolatile memory. Is implemented in such a way.

In particular, the electronic image display system for the electronic device implements an OSD function by storing and displaying bitmap images for OSD in the vehicle's main processor or by adding an additional flash memory in addition to an image processing processor (ISP).

As such, the image display system having a conventional OSD function applied to the electronic device is a method of storing and outputting a bitmap image for OSD to a vehicle main processor operating at a speed different from that of an image processing processor (ISP). By doing so, it is difficult to display the image for the OSD at the exact time. In addition, when a method of additionally including a nonvolatile memory for storing bitmap images for OSD is adopted, the cost of implementing an image display system having an OSD function may be increased.

On the other hand, the image display system having a conventional OSD function, by simply combining the bitmap image for the OSD with the background image captured by the camera, the phenomenon that the image for the OSD is hidden by the background image occurs to visually display the image displayed by the user Problems may arise that may cause inconvenience in recognizing.

Therefore, in the art, an image having an OSD function capable of displaying an image for an OSD so as to prevent incurring additional system implementation costs, display an image for an OSD quickly and immediately, and at the same time not interfere with visual recognition of a background image. A display system is required.

The present invention allows for the rapid and instant display of images for on-screen display (OSD) images while at the same time having an OSD function that does not require additional non-volatile memory to store images for OSD, such as ROM or flash memory. The technical problem to be solved is to provide a display system.

Another object of the present invention is to provide an image display system having an OSD function capable of displaying an OSD image so as not to interfere with visual recognition of a background image.

According to an aspect of the present invention,

A main processor having a user program area for storing pixel data of a bitmap image for an on-screen display in the user program area;

A register which sequentially receives pixel data of the bitmap image from the main processor;

A level checking unit for confirming that pixel data of a bitmap image input to the register is updated;

A volatile memory for storing pixel data confirmed as updated by the level checking unit; And

The present invention provides an image display system having an OSD function including an image synthesizer which synthesizes and outputs background data and pixel data stored in the volatile memory.

In one embodiment of the present invention, the pixel data of the bitmap image for the on-screen display stored in the user program area may have the most significant bit or the least significant bit whose mutual level is changed according to the order in which they are stored.

In this embodiment, the level checking unit may check the most significant bit or the least significant bit of the pixel data of the bitmap image input to the register to confirm that the pixel data has been updated when the level is changed.

In one embodiment of the present invention, the image synthesizing unit, an active pixel setting unit and the active pixel to determine the active pixel data coupled to the background image of the pixel data of the bitmap image for the on-screen display stored in the inactive memory And an image combiner configured to combine and output the active pixel data determined by the setting unit to the background image.

In this embodiment, the active pixel setting unit may alternately set the active pixel data and the inactive pixel data not combined with the background image in the horizontal and vertical directions of the bitmap image for the on-screen display stored in the inactive memory. have.

In another embodiment of the present invention, the image synthesizing unit may include a flashing setting unit and a flashing setting unit for repeating outputting and blocking pixel data of the bitmap image for the on-screen display stored in the inactive memory at a predetermined time interval. The pixel data of the bitmap image for the on-screen display stored in the inactive memory is coupled to the background image during a time interval during which the pixel data of the bitmap image for the on-screen display stored in the inactive memory is output by the active pixel setting unit. It may include an image combiner for outputting.

In another embodiment of the present invention, the image synthesizing unit may include: an active pixel setting unit configured to determine active pixel data combined with the background image among pixel data of the bitmap image for the on-screen display stored in the inactive memory; A flicker setting unit for repeating outputting and blocking the active pixel data at a preset time interval; And an image combiner configured to combine the active pixel data output from the blink setting unit with the background image and output the combined image.

In the above embodiments, the image synthesizing unit may further include a combined region filtering unit configured to apply a low pass filter to a region in which pixel data of the on-screen display bitmap image is combined in the image output from the image combining unit. Can be.

According to the present invention, since an additional nonvolatile memory for storing the bitmap image for the OSD is not required, the cost for implementing the image display system having the OSD function can be reduced.

In addition, according to the present invention, there is an effect capable of quickly and immediately data input and output of the bitmap image for ODS between the main processor and the image processing processor having different mutual speed.

In addition, according to the present invention, the OSD bitmap image obscures the background image input from the camera or suppresses mutual mismatch between the two images, thereby enabling the user to visually recognize a higher quality image.

1 is a block diagram of a video display system having an OSD function in accordance with an embodiment of the present invention.
2 is a diagram showing an example of a user program area of a main processor for storing pixel data of a bitmap image for an OSD in an image display system having an OSD function according to one embodiment of the present invention;
3 is a detailed block diagram illustrating in detail an image combining unit of an image display system having an OSD function according to an embodiment of the present invention;
4 is a diagram showing an example of an OSD bitmap image applied in an image display system having an OSD function according to an embodiment of the present invention.

Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, it should be noted that the shapes, sizes, etc. of the components shown in the drawings may be exaggerated for clarity.

1 is a block diagram of a video display system having an OSD function according to an embodiment of the present invention.

As shown in FIG. 1, an image display system having an OSD function according to an embodiment of the present invention includes a main processor 11, a register 12, a volatile memory 13, a level checking unit 143, The image synthesizer 142 may be included. The level checking unit 143 and the image synthesizing unit 142 may be included in an image processing processor 14 for processing an image input from a camera. In FIG. 1, the image processor 141 may be understood as an element for generating an RGB image having improved quality by applying a conventional image processing algorithm to an image input from a camera, and the memory controller 144 may include a volatile memory 13. It can be understood as a typical element for controlling the data input and output with). In addition, the display device 15 may be understood as a conventional device such as a liquid crystal display (LCD) that converts image data to be visually recognized by a user.

The main processor 11 has a user program region 111 that can input and output data by a user. In particular, in the case of an image display system used for electronic equipment, the main processor 11 may be implemented as a micro controller unit (MCU). In general, the process of configuring a system uses an MCU to control the system. If the system using the MCU is not a system having a very complex function but performs a single function or several functions, the user program area of the MCU has a large margin. In particular, the electronic system may be configured to implement simple functions in a single chip unit for system stability. Thus, in battlefield systems, the MCU's user program area may provide sufficient storage space for storing bitmap images for on-screen displays.

In the present invention, the on-screen display bitmap image is stored in the user program area of the main processor 11.

2 is a diagram illustrating an example of a user program area of a main processor that stores pixel data of a bitmap image for an OSD in an image display system having an OSD function according to an embodiment of the present invention.

As shown in FIG. 2, the user program area 111 of the main processor 11 may have a plurality of data storage areas, and one data storage area includes one pixel data constituting a bitmap image for an OSD. It may be sequentially stored in the pixel order of the bitmap image.

The pixel data of the OSD bitmap image stored in the user program area 111 of the main processor 11 may be set to include information for input / output control in the most significant bit (MSB) or the least significant bit (LSB). That is, as shown in FIG. 2, the pixel data of the bitmap image for the on-screen display stored in the user program region 111 includes the most significant bit (or least significant bit) whose mutual level is changed according to the order in which the data is stored. Can have Figure 2 shows an example of the most significant bit, but the least significant bit can also be set in the same way.

The most significant bit or the least significant bit of the pixel data may be used to determine whether the level change is confirmed by the level checking unit 143 described later and the pixel information stored in the register 12 is updated.

The register 12 receives pixel data from the user program area 111 and stores the pixel data. The register 12 receives one pixel data stored in the user program area 111 one by one sequentially and stores one pixel data rather than receiving and storing all pixel data stored in the user program area 111.

The pixel data stored in the register 12 is confirmed to be updated by the level checking unit 143. That is, the level checking unit 143 may check the pixel data stored in the register 12 in association with the operation speed of the image processing processor 14. The level checking unit 143 checks the level of the most significant bit or the least significant bit of one pixel data stored in the register 12, and determines whether there is a change with the level checked in the previous order. For example, when the pixel data input from the user program area 111 to the register 12 is not updated, the level checking unit 143 maintains the level of the most significant bit or the least significant bit of the pixel data stored in the register. You can see that. On the other hand, when the pixel data input from the user program area 111 into the register 12 is updated from the previously stored pixel data to the next pixel data, the level checking unit 143 is the most significant bit of the pixel data stored in the register. Alternatively, it may be confirmed that the level of the least significant bit has changed.

The volatile memory 13 may store pixel data determined by the level checking unit 143 that the level of the most significant bit or the least significant bit is changed, that is, updated. The volatile memory 13 is a memory such as RAM that temporarily stores data for system operation. The volatile memory 13 is a memory in which information stored when the system power is cut off or used for other system operation is lost. The output of data may be controlled in the volatile memory 13 by the memory controller 144 that may be included in the image processing processor 14.

As described above, although the operating speeds of the main processor 11 and the image processing processor 14 are different, the present invention stores pixel data stored in the user program area of the main processor 11 and output at the operating speed of the main processor. By checking the level check unit, pixel data can be sequentially stored in volatile memory at almost the same time as output.

The image synthesizing unit 142 mutually synthesizes the electric field image captured by the camera and input in real time and the pixel information of the OSD bitmap image stored in the volatile memory 13. The battlefield image becomes a background image, and the OSD bitmap image adds specific information or an alert message to the background image.

The image synthesizing unit 142 may include at least some of an active pixel setting unit 31, a blinking setting unit 33, an image combining unit 35, and a combined area filtering unit 37. For example, one embodiment of the present invention may not include one of the active pixel setting unit 31 and the blink setting unit 33.

The active pixel setting unit 31 determines active pixel data combined with the background image among the pixel data of the bitmap image for the on-screen display stored in the inactive memory 13. 4 is a diagram illustrating an example of an OSD bitmap image applied to an image display system having an OSD function according to an embodiment of the present invention. For example, as illustrated in FIG. 4, the active pixel setting unit 31 includes the active pixel data and the active pixel data in the horizontal and vertical directions of the bitmap image for the on-screen display stored in the inactive memory 13. You can alternately set inactive pixel data that is not combined with the background image.

As described above, the present invention may combine a portion of the pixel data of the bitmap image for the on-screen display with the background screen so that a part of the combined screen may be revealed in a semi-transparent state without being completely obscured.

The blink setting unit 33 outputs pixel data of the bitmap image for the on-screen display stored in the inactive memory 13 or active pixel data determined by the above-described active pixel setting unit 31 at predetermined time intervals. And blocking can be repeated. Here, it may be understood that the time interval set by the blink setting unit 33 includes a case where the output or the interruption is continuously maintained. The flicker setting unit 33 provides pixel data or active pixel data of the OSD bitmap image to the image combiner 35 at a predetermined time interval to be combined with the background image so that the OSD is predetermined in the final output image. Enables you to get blinking effects at timed intervals. This can improve the visibility of certain alert images to the user.

The image combiner 35 may apply pixel data of an OSD bitmap image to a background image such as a battlefield image. The image combiner 35 may apply pixel data of an OSD bitmap image to various preset positions in various ways. For example, by applying pixel data of the OSD bitmap image adjacent to each side of the entire background image, the OSD may be displayed in close contact with the upper or lower portion of the displayed image. In another example, the visibility may be further improved by forming a border around pixel data of the OSD bitmap image. Alternatively, a specific background color may be applied to a position where pixel data of an OSD bitmap image is applied. The operation of the image combiner 35 may be variously changed in design.

The combining region filtering unit 37 applies a low pass filter to the region in which the pixel data of the bitmap image for the on-screen display is combined in the image output from the image combining unit 35. When the low pass filter is applied to the entire input image, the overall sharpness of the image may be degraded. Therefore, the combined region filtering unit 37 of the present invention applies the low pass filter only to the region in which the pixel data of the on-screen display bitmap image is combined with the background image. Through this low pass filtering, the background image and the bitmap image for the OSD can be smoothly alleviated and the matching cannot be made, thereby providing a higher quality image to the user.

As described above, the present invention does not require an additional nonvolatile memory for storing the bitmap image for the OSD, thereby reducing the cost of implementing an image display system having an OSD function and having different mutual speeds. Fast and instant data input and output of ODS bitmap images is possible between the main processor and the image processing processor.

In addition, the present invention may suppress the occurrence of mutual mismatch between the two images or the background image inputted from the camera by the OSD bitmap image to enable the user to visually recognize the image of higher quality.

In the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the following claims and their equivalents.

11: main processor (MCU) 111: user program area
12: Register 13: Volatile Memory
14: image processing processor (ISP) 141: image processing unit
142: video synthesizing unit 143: level checking unit
144: memory controller 15: display device
31: active pixel setting part 33: blinking setting part
35: image combiner 37: combine region filter

Claims (7)

A main processor having a user program area for storing pixel data of a bitmap image for an on-screen display in the user program area;
A register which sequentially receives pixel data of the bitmap image from the main processor;
A level checking unit for confirming that pixel data of a bitmap image input to the register is updated;
A volatile memory for storing pixel data confirmed as updated by the level checking unit; And
An image synthesizer for synthesizing the pixel data stored in the volatile memory and a background image
Image display system having an OSD function comprising a.
The method of claim 1,
The pixel data of the bitmap image for the on-screen display stored in the user program area has the most significant bit or the least significant bit whose mutual level is changed according to the order of storage.
The level checking unit checks the most significant bit or the least significant bit of the pixel data of the bitmap image input to the register, and confirms that the pixel data is updated when the level is changed. .
The method of claim 1, wherein the image synthesizing unit,
An active pixel setting unit which determines active pixel data coupled to the background image among pixel data of the bitmap image for the on-screen display stored in the inactive memory; And
And an image combiner configured to combine and output the active pixel data determined by the active pixel setter to the background image.
The method of claim 3, wherein the active pixel setting unit,
An image display system having an OSD function, wherein the active pixel data and the inactive pixel data not combined with the background image are alternately set in the horizontal and vertical directions of the bitmap image for the on-screen display stored in the inactive memory. .
The method of claim 1, wherein the image synthesizing unit,
A flicker setting unit for repeating outputting and blocking pixel data of the bitmap image for the on-screen display stored in the inactive memory at a predetermined time interval; And
The blinking setting unit in the on-screen display bitmap image stored in the inactive memory in the background image for a time interval in which the pixel data of the bitmap image for the on-screen display stored in the inactive memory is output by the active pixel setting unit And an image combiner for combining and outputting pixel data of the image display system.
The method of claim 1, wherein the image synthesizing unit,
An active pixel setting unit which determines active pixel data coupled to the background image among pixel data of the bitmap image for the on-screen display stored in the inactive memory;
A flicker setting unit for repeating outputting and blocking the active pixel data at a preset time interval; And
And an image combiner configured to combine and output the active pixel data output from the blink setting unit to the background image.
The image synthesizing unit according to claim 3 or 5 or 6,
And a combined region filtering unit for applying a low pass filter to a region in which the pixel data of the on-screen display bitmap image is combined in the image output from the image combining unit. .

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