VCT Vision ELITE Series Especificaciones descargar pdf (Pagina 60)

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In Generation 1 images, the predictor value used at the beginning of each line is the last pixel

value from the previous line in the image (Assumes Left to Right, Top to Bottom scanning of the

pixels).

The Generation 2 and industry compliant predictor for the first line element of each line should

be the first element of the line above the current line. For the first line, first element predictor

should be the unsigned value that is half the full-scale range for the "sample precision" (GEHC

uses (1 << 15) = 32768).

The GEHC Generation 1 JPEG computation of the difference to be Huffman encoded was

computed as (Predictor - value) when it should have been calculated as (value - Predictor) .

The result is that the decompression via industry standard packages results in a negative of the

original image and a breakdown of the pixel basis when the last pixel on a line is different from

the first pixel on the next line.

The JPEG software distributed by the Independent JPEG Group does not include an important

feature found in the GEHC, the Stanford, and the Cornell JPEG packages with respect to

handling 16 bit deep images. In the case where the "huffDECODE" would return a category 16

value indicating that 16 bits should be acquired from the bit stream, the correct action is to add

32768 to the current value and to NOT get the number from the bit stream. Without this test [if

(s == 16) dx += 32768; else ...], the image will exhibit a spatial offset resulting from the incorrect

synchronization of the input bit stream.

This version and all future GEHC LightSpeed software will read (but not write) the Installed

Base Generation 1 media. In addition, the creation of Generation 2 media as has been initiated

and the new format media will be Industry compatible JPEG and will NOT use the Multi-

Fragment segmentation. The ability to handle Multi-Segment data sets is also being deployed to

handle the small number of Multi-Fragment images that have reached media.

3.6 Configuration

The MOD Archive Application may have either a 1.2GB or a 2.3GB drive installed.

Table 3.6-1: Supported Profiles for various Drive Configurations

Disk Drive Installed Profiles Supported

1.2GB Optical Disk Drive PRI-CTMR-MOD12

STD-CTMR-MOD12

2.3GB-Optical Disk Drive PRI-CTMR-MOD12

STD-CTMR-MOD12

STD-CTMR-MOD23

3.7 Support of Extended Character Sets

The MOD Archive Application will support copy of SOP instances containing the ISO

IR 100 (Latin alphabet No. 1, supplementary set) and DICOM default character sets as defined

in PS3.5.

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