MXPA06000816A - A system and a method to avoid on-screen fluctuations due to input signal changes while in an osd or graphic centric mode - Google Patents

Abstract

The disclosed embodiments relate to a system and method for modifying video signals. The system (16) may comprise at least one decoder (14) that decodes a video signal that comprises embedded picture setting data, and a video processor (18) that is adapted to detect whether the system (16) is operating in an on-screen display ("OSD") mode, apply the embedded picture setting data if the system (16) is not in the OSD mode, and withhold the embedded picture setting data if the system (16) is in the OSD mode. The method may comprise the acts of decoding a video signal that comprises embedded picture setting data, detecting whether a system (16) is operating in the OSD mode, applying the embedded picture setting data if the system (16) is not in the OSD mode, and withholding the embedded picture setting data if the system (16) is in the OSD mode.

Description

A SYSTEM AND A METHOD TO AVOID FLUCTUATIONS ON SCREEN DUE TO CHANGES OF ENTRY SIGNAL WHILE YOU ARE IN A SCROLL DOWNLOAD ON SCREEN 0 IN DOWNGRAD MODE GRAPHIC FIELD OF THE INVENTION The present invention relates in general to deploying the video programming on a television or monitor. More specifically, the present invention relates to a method for reducing screen fluctuations by channel changes when displaying video signals with the use of a screen display or in a graphical center mode.

BACKGROUND OF THE INVENTION This section is intended to introduce the reader to various aspects of the art, which may relate to various aspects of the present invention that are described and / or claimed below. It is believed that this description is useful in providing the reader with background information to facilitate a better understanding of various aspects of the present invention. In accordance with this, it should be understood that these statements should be read in light of this and not as admissions of prior art. Modern video systems use increasingly sophisticated video deployment technologies, such as an on-screen display or a graphic centric mode (referred to collectively as "OSD") to aid in the deployment of video. The OSD offers features such as on-screen guides and network browsers. In this environment, the video is displayed in a window that takes less than the full video screen. During normal or non-normal OSD operation, the image settings for a deployment device can change rapidly for several reasons. These reasons include, but are not limited to, channel changes and commercial breaks. In response to these rapid changes in image settings, a decoder unit, such as a cable box, or the display device, such as a television or a digital light projection system ("DLP") can automatically adjust the screen format or display colorimetry. These settings may be based on the image data that is embedded within the incoming video signal or based on the default image data determined by the type of video signal. The new image adjustments usually apply somewhat abruptly, but most viewers do not perceive the abrupt changes because the full screen changes with the input changes. On the contrary, when the video is deployed with the use of OSD, the OSD does not change with the input changes. In this situation, when the display adapts the image settings in response to a change in the image data, it can cause abrupt, very noticeable screen fluctuations that can annoy viewers.

BRIEF DESCRIPTION OF THE INVENTION The modalities described relate to a system and method for modifying video signals. The system may comprise at least one decoder that decodes a video signal comprising embedded image adjustment data, and a video processor that is adapted to detect whether the system operates in a screen display ("OSD") mode. , applies the embedded image adjustment data when the system is not in OSD mode and retains the image adjustment data embedded when the system is in OSD mode: The method may comprise the actions of decoding a video signal comprising embedded image adjustment data, detecting whether a system operates in OSD mode, applying the embedded image adjustment data when the system is not in OSD mode, and retaining the image adjustment data embedded when the system is in the OSD mode.

-BREVE DESCRIPTION OF THE DRAWINGS In the drawings: Figure 1 is a block diagram of a video system with analog and digital video decoder inputs in accordance with the embodiments of the present invention. Figure 2 is a process flow diagram showing a process for determining whether the system should be in OSD or in a graphical centric mode in accordance with the embodiments of the present invention; and Figure 3 is a flow chart of the process showing the image adjustment selection process in accordance with the embodiments of the present invention. The features and advantages of the present invention may be more apparent from the following detailed description, offered by way of example.

DETAILED DESCRIPTION OF THE INVENTION Next, one or more specific embodiments of the present invention will be described. In an effort to provide a concise description of these modalities, not all features of an actual implementation are described in this specification. It should be appreciated that in the development of any real implementation, such as in an engineering or design project, many implementation-specific decisions must be made to achieve the developer's objectives, such as adapting to the restrictions related to the system or with the business, which may vary from one implementation to another. Furthermore, it should be appreciated that such a development effort can be complex and time-consuming, but nevertheless, for those experienced in the art it will be a routine involved with the design and manufacture that has the benefits of this description.

Figure 1 is a block diagram of a video system with the inputs of the digital and analog video decoder where the embodiments of the present invention can be employed. The diagram is usually marked with the reference number 10. The video system 10 comprises a decoding unit 16 and a deployment device 30. An analog signal decoder 12 and a digital signal decoder 14 may be among the features of the decoding unit 16. These two types of signal decoders are configured to receive incoming video signals from a video provider such as a satellite or cable television provider. Once the incoming video signal is received, the decoding unit 16 determines whether the image data, such as colorimetry data or screen format data, has been encoded in the incoming video signal by the transmitter. This determination can be carried out, for example, by a video processor 18. When the incoming video signal contains embedded image data, it is extracted. When the video system 10 is not in an on-screen display or in a central graphic mode (referred to collectively as "OSD"), the embedded image data alone is used to select the screen format and a color conversion matrix associated When the video system 10 is in OSD, the screen format remains unchanged and the color conversion matrix is selected to convert the incoming video signal to match the current colorimetric settings for the OSD. The current colorimetry settings for the OSD are the colorimetry settings used by the video system 10 to display a video signal. These settings can be based on several factors including the type of deployment device or the type of video signal to be displayed at that time. When the incoming video signal does not contain embedded image data, the default image data can be replaced. The default image data is determined based on the type of incoming video signal. For example, when the incoming video signal is an analog NTSC video signal, the 170M colorimetric standard can be used, or when the video signal is a similar high definition video signal, colorimetry 274 can be used for the color image formation. The default image data can be programmed for any type of incoming video signal and can vary based on factors known to those skilled in the art. The analog and digital decoders transmit the incoming video signal to a video processor 18. When the video system 10 operates in the OSD mode, the video processor can combine the video signal with the OSD. The OSD may also be combined with the incoming video signal in other locations within the video system 10. Then, the video signal may undergo a color conversion process in the color conversion unit 22. It should be noted that the color conversion process can also be carried out within the video processor 18, within the deployment device 30 (as shown in block 26), or within any combination of these three locations. The color conversion process applies a color conversion matrix that was generated by the decoding unit 16. Once the color conversion matrix has been applied, the colorimetry settings of the incoming video signal closely match the current image settings for the OSD. The incoming video signal can then be transmitted to the display device 30. As mentioned before, the video signal may undergo partial or complete color conversion in the color conversion unit 26 located in the deployment device 30. Similarly, the screen format can be adjusted all or in part by the decoding unit 16, the deployment device 30 or by a combination of the two. The incoming video signal is then displayed in the deployment unit 28. Thus, although the image settings of the incoming video are different from the current image settings, there is little jitter when the incoming video signal is displayed, since the incoming video signal has been adjusted to match the image settings current Figure 2 is a process flow diagram showing a process for determining whether the video system should be in OSD or in a graphical centric mode in accordance with the embodiments of the present invention. In general, the process is indicated by the use of the reference number 40. This process can run continuously on the backup of the video system. In block 42, the process begins with the reception of a control command. The control command can direct the video system to perform any number of functions, including channel changes, change inputs, or turn the OSD off or on: The control command can be received from a number of sources, including a remote control or buttons on the video system. After processing of the control command, the current state of the video system is checked in block 46. When the device is in OSD mode, an OSD tag is set in block 48. Otherwise, the ISD tag is released in block 50. Normal processing continues in block 52. In block 54, the process ends. Figure 3 is a process flow diagram showing the image adjustment selection process in accordance with the embodiments of the present invention. The process is indicated, generally, with the use of reference number 60. In block 64, a test is carried out to determine whether the OSD tag has been adjusted. When the OSD tag is set, the current screen format is maintained in block 66 and the system converts the colorimetric settings of the incoming video to match the colorimetric settings in block 68. On the other hand, when the OSD tag, the screen format embedded in the incoming video signal is selected, as shown in block 70. In this case, the color conversion matrix is generated based on the incoming video signal (block 72). In block 74, the process ends. This detailed description has focused on two individual image settings: the screen format and the colorimetry. It should be noted that the screen format and colorimetry are merely two examples of Image adjustments. Other examples may fall within the scope of the present invention. While this invention is susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and are described in detail herein. However, it should be understood that the invention is not intended to be limited to the particular forms set forth. Rather, the invention encompasses all modifications, equivalents and alternatives that fall within the spirit and scope of the invention., as defined in the appended claims.

Claims (20)

1. A system (16) for modifying video signals, the system (16) is characterized in that it comprises: at least one decoder (14) that decodes a video signal comprising embedded image adjustment data; and a video processor (18) that is adapted to: detect whether the system (16) operates in a screen display mode ("OSD"); apply the embedded image adjustment data when the system (16) is not in the OSD mode; and retaining the embedded image adjustment data when the system (16) is in the OSD mode.

The system (16) according to claim 1, characterized in that the embedded image adjustment data comprise screen format data.

The system (16) according to claim 1, characterized in that the embedded image adjustment data comprise colorimetry data.

The system (16) according to claim 3, characterized in that it comprises a color conversion device (22) that performs a color conversion based on the colorimetry data.

The system (16) according to claim 1, characterized in that it comprises a deployment device (30) configured to display an image based on the video signal.

The system (16) according to claim 1, characterized in that the video processor (18) is adapted to fit a label when the system (16) operates in the OSD mode.

7. The system (16) according to claim 1, characterized in that the system comprises a portion of a television set.

8. A method for modifying video signals, the method is characterized in that it comprises the steps of: decoding a video signal comprising embedded image adjustment data; detecting whether the system (16) operates in a screen display mode ("OSD"); apply the embedded image adjustment data when the system (16) does not operate in the OSD mode; and retaining the embedded image adjustment data when the system (16) is in the OSD mode.

The method according to claim 8, characterized in that it comprises the step of determining whether the embedded image adjustment data comprises screen format data.

The method according to claim 8, characterized in that it comprises the step of determining whether the embedded image adjustment data comprise colorimetry data.

11. The method according to claim 8, characterized in that it comprises the step of carrying out a color conversion based on the colorimetry data.

The method according to claim 8, characterized in that it comprises the step of displaying an image based on the video signal.

The method according to claim 8, characterized in that it comprises the step of adjusting a label when the system (16) operates in the OSD mode.

14. A system (16) for modifying video signals, the system (16) is characterized in that it comprises: means (14) for decoding a video signal comprising embedded image adjustment data; means (18) for detecting whether the system (16) operates in a screen display mode ("OSD"); a means (18) for applying the embedded image adjustment data when the system (16) does not operate in the OSD mode; and a means (18) for retaining the embedded image adjustment data when the system (16) is in the OSD mode.

The system (16) according to claim 14, characterized in that the embedded image adjustment data comprise screen format data.

The system (16) according to claim 14, characterized in that it comprises the embedded image adjustment data comprising colorimetry data.

17. The system (16) according to claim 16, characterized in that it comprises a means for carrying out a color conversion (22) based on the colorimetry data.

18. The system (16) according to claim 14, characterized in that it comprises a deployment device for displaying an image based on the video signal. The system (16) according to claim 14, characterized in that it comprises the detecting means (18) adapted to adjust a label when the system (16) operates in the OSD mode. The system (16) according to claim 14, characterized in that the system comprises a portion of a television set.