DE102007026593B4 - Method and arrangement for increasing the data transfer rate between an image source and a monochrome image display device - Google Patents

Abstract

A method of increasing the data transfer rate between an image source (1) and a monochrome image display device (5) to which the image source (1) supplies digital m-bit wide gray scale signals over a 3n-bit wide (3n> m) transmission path (3) which has n-bit-wide R, G, B color channels, wherein
The bit values of 2m-bit-wide (m <3n) gray-scale signals (8, 9) 2m bits of the 3n-bit-wide (3n> m) transmission path (3) according to an encoding rule of an encoder (6) of the image source (3) assigned and the remaining (3n-m) bit positions of the 3n-bit-wide transmission path (3) are not occupied,
In accordance with a decoding rule of a decoding device (7) of the picture display device (5) corresponding to the coding rule, the 2 m-bit wide (2m≤3n) gray scale signals (8, 9) are restored by the decoding device (7) replacing the unused (3n) m) does not evaluate bit positions of the 3n-bit-wide transmission path (3) and assigns the bit values of the remaining 2m bit positions (2m ≤ 3n) of the transmission path (3) to the two m-bit-wide gray scale signals (8, 9).

Description

method and arrangement to increase the data transfer rate between an image source and a monochrome image display device

The The invention relates to a method and an arrangement for increasing the Data transfer rate between an image source and a monochrome image display device, which the image source digital m-bit wide gray level signals over a 3n-bit wide (3n> m) transmission path which one feeds n bit wide R, G, B color channels having.

in the Medical field in particular for the evaluation of X-ray images Monochrome Display Performance used, to which very high demands placed on the grayscale resolution are. In view of such an application, these monochrome image display devices are superior to the color image display devices. For now become grayscale resolution 10-bit wide grayscale signals which allows 1024 shades of gray on a monochrome image display device.

To the Connect a picture display device An image source usually becomes a so-called DVI (Digital Video Interface) cable is used, wherein a so-called DVI dual-link transmission is being used. For this purpose, the image source has two transmitters, which each over 8-bit wide R, G, B channels of the DVI cable to a receiver of the image display device are connected. With such a dual-link transmission can Image data is transmitted at a pixel clock of 330 MHz. This is enough out to z. B. a picture display device with a resolution of 2720 × 2097 Pixels (visible pixels 2560 × 2048) and a refresh rate of 50 Hz. The pixel clock of the Image reproduction device is in this case 285 MHz, which is below the 330 MHz bandwidth of the DVI dual-link transmission.

adversely is that compared to a DVI single-link transmission, with which image data is transmitted with a pixel clock of 165 MHz be the interference immunity the DVI dual-link devices is not satisfactory. In addition, the use of DVI dual-link devices more expensive than DVI single-link devices, on the one hand both the graphics card of the image source and the Electronics of the image display device must be designed accordingly. Furthermore, a DVI cable with each two-way R, G, B color channels required to two transmitters the image source with two receivers of the Image reproduction device to be able to connect.

From the EP 17 36 867 A2 For example, a method for color transfer of a color signal is known. The transmission of the colors is limited to associated color channels, namely the R color channel, the G color channel and the B color channel.

Of the The present invention is based on the object, a method and to provide an arrangement of the type mentioned, which or which a high data transmission with little effort possible.

These Task is in terms of a method with the in claim 1, with regard to the arrangement with the specified in claim 2 activities solved.

Advantageous is that the image information from two pixels transmitted in parallel can be which doubles the pixel clock. That means that between an image source and a picture display device with a resolution of 2720 × 2097 Pixels (visible pixels 2560 × 2048) and a frame rate of 50 Hz (pixel clock 285 MHz) a DVI single-link transmission at 330 MHz is possible. On a DVI dual-link transmission can be dispensed with.

The Invention is based on the idea that in the DVI standard usually for the transmission of Color information bandwidth used for higher grayscale resolution and higher Use refresh rate.

Based the drawing in which an embodiment The invention is illustrated below, the invention, their embodiments and advantages explained in more detail.

It show in a schematic representation:

1 an arrangement with an image source and a monochrome image display device and

2 Method steps for coding and decoding digital signals.

The in the figures occurring like parts are given the same reference numerals Mistake.

A transmitter 2 an image source 1 , which can be part of a graphics card, is via a DVI cable known per se 3 with a receiver 4 a monochrome image display device 5 connected in the form of an LCD display module. Components of the DVI cable 3 are three 8-bit wide R, G, B channels, over which the image source 1 the monochrome image display device 5 a digital R, G, B signal, and a clock line Ta for transmitting a clock signal. The following is assumed to be the image source 1 a user Program for preparing and displaying a black and white X-ray image on the image display device 5 wherein the user program generates a 10-bit wide gray scale signal Gs comprising an encoder 6 the image source 1 processed. The coding device 6 generates R, G, B signals transmitted via the transmitter 2 over the three 8-bit wide R, G, B channels of the DVI cable 3 and the receiver 4 a decoder 7 of the image display device 5 be supplied. This decoding device 7 processes the from the encoder 6 transmitted signals and generated again from the 10-bit wide gray scale signal Gs for displaying corresponding monochrome image information on a display of the image display device 5 ,

In order to increase the data transmission rate, it is provided that first the coding device 6 8-bit-wide R, G, B color signals are generated from two 10-bit-wide gray-scale signals and the image display apparatus according to an encoding rule 5 over the 8-bit-wide R, G, B channels of the DVI cable 3 transmitted. These R, G, B color signals eventually prepare the decoder 7 of the image display device 5 according to a decoding rule corresponding to the coding rule, and from these in turn generates the two 10-bit-wide gray scale signals.

For further explanation, the following is on the 2 referenced, in which an encoding or decoding of a gray-scale signal or of R, G, B color signals is illustrated.

A user program generated two 10-bit wide grayscale signals 8th . 9 processes the encoder 6 ( 1 ) according to a coding rule in such a way that the coding device 6 generates an R signal whose bit values of the bit positions R0, R1,... R7 correspond to the bit values of the bit positions A2, A3,..., A9 of the gray level signal 8th correspond. Furthermore, the encoder generates 6 a G signal, wherein the encoder 6 the bit values of bit positions A1, A0 of the gray scale signal 8th the bit locations G7, G6 of the G color signal and also the bit values of the bit locations C9, C8,... C4 of the gray level signal 9 assigns bit positions G5, G4, ... G0 of the G color signal. The remaining bit values of the bit locations C3, C2, C1, C0 of the gray scale signal 9 finally arranges the encoder 6 the bit positions B7, B6, B5, B4, wherein the remaining bit positions B3, B2, B1, B0 of the B signal does not occupy the coding device. This generated in this manner R, G, B color signals transmitted by the transmitter 2 via the R, G, B color channels of the DVI cable to the receiver 4 at a clock instant, meaning that the coded gray scale signals 8th . 9 be transmitted in parallel at this time and the pixel clock rate of the image display device 5 can be doubled to represent the image information. Of course, it is possible to differentiate the 24 bit positions of the R, G, B signals. For example, the bit values of the bit locations A2,..., A9 of the gray scale signal 8th the bit positions B0, B1, ..., B7 of the B signal, the bit values of the bit positions C2, C3,..., C9 of the gray scale signal 9 the bit locations G0, G1, ..., G7 of the G signal and the remaining bit values of the bit locations A0, A1 of the gray scale signal 8th and C0, C1 of the gray scale signal 9 be assigned to the bit positions R0, R1, R2, R4 of the R signal. In this case, the bit positions R4, R5, R6, R7 of the R signal are not occupied. In all cases, the "knowledge" about the way of encoding the grayscale signals 8th . 9 in the decoder 7 stored to decode the R, G, B signals without error and thus the gray scale signals 8th . 9 restore.

The following details the decoding of the 8-bit wide R, G, B color signals to recover the two 10-bit wide gray scale signals 8th . 9 received. The decoder 7 processes the R, G, B signals according to a decoding rule corresponding to the coding rule in such a manner as to provide the 10-bit wide gray scale signal 8th from the R and G signal and also the 10-bit wide gray scale signal 9 from the G and B signal ( 2 ). The term "corresponding" should be understood to mean that the "knowledge" about the manner of encoding the gray scale signals 8th . 9 in the decoder 7 must be deposited to decode the R, G, B signals without error and thus the gray scale signals 8th . 9 to recover. The decoder 7 assigns the bit values of the bit positions R0, R1, ..., R7 of the R signal to the bit positions A2, A3, ..., A9 of the gray level signal 9 and the bit values of the bit positions G6, G7 of the G signal correspond to the bit positions A0, A1 of the gray scale signal 9 to, causing the grayscale signal 9 is restored. Furthermore, the decoder generates 7 from the bit values of the bit positions G0, G1, ..., G5 of the G signal and the bit positions B4, B5, B6, B7 of the B signal, the gray scale signal 10 by the decoder 7 the bit positions C0, C1, C2, C3 the bit values of the bit positions B4, B5, B6, B7 of the B signal and the bit positions C4, C5,..., C9 the bit values of the bit positions G0, G1,..., G7 of the Assigns G signal. The bit values of bit positions B0, B1, B2, B3 are left by the decoder 7 unconsidered.

The generated or restored gray scale signals 8th . 9 which are provided to a graphics processor of the image display apparatus in parallel at one time are displayed by this processor to display monochrome image information at a two-time pixel rate.

Claims (2)

Method for increasing the data transmission rate between an image source ( 1 ) and a monochrome image display device ( 5 ) to which the image source ( 1 ) digital m-bit wide gray level signals over a 3n-bit wide (3n> m) transmission path ( 3 ), which has n-bit-wide R, G, B color channels, wherein - according to an encoding rule of an encoder ( 6 ) of the image source ( 1 ) the bit values of 2m-bit-wide (m <3n) gray scale signals ( 8th . 9 ) 2m bit positions of the 3n-bit-wide (3n> m) transmission path ( 3 ) and the remaining (3n-m) bit positions of the 3n-bit-wide transmission path ( 3 ) are not assigned, - according to a decoding rule of a decoding device corresponding to the coding rule ( 7 ) of the image display device ( 5 ) the 2m-bit wide (2m ≤ 3n) grayscale signals ( 8th . 9 ) are restored by the decoder ( 7 ) the unoccupied (3n-m) bit positions of the 3n-bit wide transmission path ( 3 ) and the bit values of the remaining 2m bit positions (2m ≤ 3n) of the transmission path ( 3 ) the two m-bit wide gray scale signals ( 8th . 9 ). Arrangement with a monochrome image display device and an image source ( 1 ), which the monochrome image display device ( 5 ) digital m-bit wide gray level signals over a 3n-bit wide (3n> m) transmission path ( 3 ) having n-bit-wide R, G, B color channels, wherein to increase the data transmission rate - an encoder ( 6 ) of the image source ( 1 ) according to a first processing instruction, the bit values of the two gray scale signals ( 8th . 9 ) 2m bit positions of the 3n-bit-wide (3n> m) transmission path ( 3 ) and the remaining (3n-m) bit positions of the 3n-bit wide transmission path ( 3 ) not occupied, - a decoding device ( 7 ) of the image display device ( 5 ) according to a decoding rule corresponding to the coding rule, the 2m-bit-wide (2m ≤ 3n) gray scale signals ( 8th . 9 ) by the decoder ( 7 ) the unoccupied (3n-m) bit positions of the 3n-bit wide transmission path ( 3 ) and the bit values of the remaining 2m bit positions (2m ≤ 3n) of the transmission path do not evaluate the two gray scale signals ( 10 . 11 ).