摘要:
With the new plasma display panel technology new kinds of artifacts can occur in video pictures due to the principle that brightness control is done with a modulation of small lighting pulses in a number of periods called sub-fields. These artifacts are commonly described as ‘dynamic false contour effect’. A technique called bit line repeat coding has been developed for reducing the false contour effect. According to this technique sub-field coding is done with common (CSF) and normal sub-fields (SF) where for the common sub-fields (CSF) identical entries in the sub-field code words of two or more corresponding pixels on two or more pixel lines are used. In this specific sub-field coding method some cases will occur in which an error has to be made due to the reduced flexibility in encoding produced by the need to have the same code on common sub-fields (CSF). The general idea of the invention is now to put the coding failures on the higher video levels of the two or more pixels being grouped together. Further improvements concern picture content analysis and or motion detection for controlling the switching between different sub-field coding modes and a specific adapted dithering pattern for use with bit line repeat coding.
摘要:
A method for power level control in a Plasma Display Panel with which the Peak White Enhancement Factor can be increased. The method includes the provision of a set of power level modes for the sub-field coding. To each power level mode a characteristic sub-field organization belongs. The sub-field organization is variable in respect to one or more of the following characteristics: the number of sub-fields the sub-field type the sub-field positioning the sub-field weight the sub-field pre-scaling a factor for the sub-field weights which is used to vary the amount of small pulses generated during each sub-field. The method includes the steps of determining a value which is characteristic for the power level of a video picture and selecting a corresponding power level mode for sub-field coding.
摘要:
A plasma display panel is a pure linear display and does not provide a non-linear gamma behaviour like a CRT so that an artificial gamma function has to be applied to the signal in digital form. This gamma function increases the quantization steps in the dark areas whereas the quantization steps will be reduced in the luminous areas. The basic idea is to apply an adaptive noise filtering after the gammatization process. The adaptive filtering is a specific filtering which is adapted to the gammatization quantization noise. In other words, the filtering will be maximum for dark areas and its efficacy will be automatically decreased when the luminance of the area is increasing.
摘要:
An improved addressing scheme for plasma display panel control comprises partitioning the panel into a number of sections and splitting the addressing period into correspondingly small addressing periods for each section. By varying the time distance between successive addressing periods of the sections from one sub-field to the other, at least for the sub-fields with higher weights, a better spread of the energy input and output of the plasma display panel is achieved and the power supply circuit for the display panel may be constructed with less expensive components.
摘要:
The invention relates to a method for processing data of video pictures for displaying the pictures on a display device like a Plasma Display Panel. The existing false contour effect compensation methods which make a false contour compensation based on shifting sub-field code word entries along the direction of the motion vector of a current pixel, produce an artifact in the pictures, in case of object crossings. In the appearing area there is a lack of light generation.The invention solves this problem by checking whether an area exists in the picture which is currently hidden but will appear in a next frame and providing an adapted compensation method for “hole filling”. The invention also gives a solution for an improved compensation method which is based on a dragging of sub-field code word entries along a motion vector direction to a current pixel.
摘要:
With the new plasma display panel technology new kinds of artifacts can occur in video pictures. These artifacts are commonly described as dynamic false contour effect, since they correspond to disturbances of grey levels and colors in the form of an apparition of colored edges in the picture when the observation point on the PDP screen moves. According to the invention such an artifact is compensated by analyzing the motion in the pictures assigning to each block of a picture a corresponding motion vector and performing a re-coding step in which a sub-field code word entry of a current pixel are calculated. For this purpose the motion vector is defined to point from a pixel in a previous picture to a pixel in the current picture. The sub-field code word entries for a current pixel (P8) are determined by dragging sub-field entries of the pixels lying on the motion vector trajectory. In this way for each pixel there is an exact calculation of the sub-field code word of a pixel also for complex moving trajectories like zoom and rotation.
摘要:
The invention relates to a reproduction device (21), with a device (20) acting as a source of digital services. It also relates to a method of synchronizing two parts of a digital service in a system including a source device according to the invention and at least one reproduction device according to the invention.According to the invention, the reproduction device (21) includes means for receiving the data forming at least a part of a digital service originating from a digital service source device (20), means for processing (210) at least some of the data received, means (211) for reproducing an output of at least a part of the digital service, the time for processing and reproducing the data introducing a delay in the output of the reproduced data. This device also includes communication means (213) for informing the source device of the delay introduced.
摘要:
A subject of the invention is to ensure that a remote display device is only useable for a specific application like advertising or public information.According to the invention, this object is solved by a method for distributing display information to a remote display device, comprising the steps of: providing the remote display device with a signal comprising an activation key and the display information, providing the control unit of the remote display device with a locking function using a control key, and comparing the activation key to the control key and authorizing the displaying of the display information by deactivating the locking function if the activation key is fitting with the control key.
摘要:
The invention relates to a reproduction device, with a device acting as a source of digital services. It also relates to a method of synchronizing two parts of a digital service in a system including a source device according to the invention and at least one reproduction device according to the invention.According to the invention, the reproduction device includes means for receiving the data forming at least a part of a digital service originating from a digital service source device, means for processing at least some of the data received, means for reproducing an output of at least a part of the digital service, the time for processing and reproducing the data introducing a delay in the output of the reproduced data. This device also includes communication means for informing the source device of the delay introduced.
摘要:
The invention relates to a reproduction device, with a device acting as a source of digital services. It also relates to a method of synchronizing two parts of a digital service in a system including a source device according to the invention and at least one reproduction device according to the invention.According to the invention, the reproduction device includes means for receiving the data forming at least a part of a digital service originating from a digital service source device, means for processing at least some of the data received, means for reproducing an output of at least a part of the digital service, the time for processing and reproducing the data introducing a delay in the output of the reproduced data. This device also includes communication means for informing the source device of the delay introduced.