Sharp IV-S30 Manual de usuario descargar pdf (Pagina 82)

Setting the Conditions for Each Object Type

3-23

(2) Gray level change

To change the gray level, you can change the

"**.*TIMES" (magnification by N processing), the

+," "

-" (

(positive/negative) correction), the

"CHNG-L" (widening histogram), and the "INCRS-

M" (mid emphasis) functions.

Details

Gray level change

Magnification by N

processing

(**.* TIMES)

(positive/negative)

correction

Histogram

widening

Mid emphasis

To improve the contrast (the ratio of high value gray levels to low value gray

levels), specify a magnification rate (00.0 to 99.9) for multiplying the image

data.

- If the magnified gray level exceeds 255, the system will correct the value

to 255.

- g positive correction: used when the mid gray level is too low.

255

Input image gray level

Output image gray level

255

Input image gray level

Output image gray level

- g negative correction: used when the mid gray level is too high.

This is a method to widen the histogram of an image in which the histogram

is at part of it, thus improve its contrast.

Emphasize the mid gray level.

- This improves contrast while remaining the background image.

- The input image density (G) can be converted to the output image density

with the following formulas:

2 Good contrast image

Gray level Gray level

1 Bad contrast image

0 to 127

128 to 255

（Ｇ÷127）

×127

（（Ｇ−128）÷127×127）＋127

Output image gray level

Input image gray level(G)

COMPARE IMGS NO

CHNG GRAY LEVEL NO

SPACE FILTER NO

IMG PRE-PROC SCREEN COND SAVE F C1 BRT

CONTRAST MAGNI

+

-

CHNG-L

INCRS-M

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 330 331

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Sharp IV-S30 Manual de usuario Pagina 82

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