Browse Prior Art Database

WINDOWING/IMAGE CROPPING

IP.com Disclosure Number: IPCOM000024858D
Original Publication Date: 1982-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 81K

Publishing Venue

Xerox Disclosure Journal

Abstract

Flexibility in the composition of the output of a raster scanner can be achieved via windowing. This allows reproduction of selected areas of the input test target if so desired and permits all cropped output to be upper left corner justified on the page when printed as shown in Figure 1.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 85% of the total text.

Page 1 of 2

A 'EROX DIĀ§CLOSURE JOURNAL

WINDOWING/IMAGE CROPPING Proposed Barbara L. Waal Classification

U.S. CI. 358/284 Int. CI. H04n 1/40

FIG: /

WINOOWING RATIONALE : COMPOSlTlON

INPUT

G

I

~~

OUTPUT

Flexibility in the composition of the output of a raster scanner can be achieved via windowing. This allows reproduction of selected areas of the input test target if so desired and permits all cropped output to be upper left corner justified on the page when printed as shown in Figure 1.

Referring to Figure 2, to carry out image cropping, the selected left, right, top and bottom margins are microprocessor loaded at 4. A series of 8 and 12 bit counters 5, 6; 7, 8 then count to the selected margins using digital clock control from the scanline clock (top/bottom margins) and pixel clock (lef t/right margins). The end of count (EOC) signals output by counters 5, 6; 7, 8 are fed to 1 to 0 and 0 to 1 signal transition circuits 10, 11 and 12, 13, respectively. The signal outputs of transition circuits 10, 12 and 11, 13 are fed to OR circuits 15, 16 to control enabling of scanlines and output of pixels, respectively.

Volume 7 Number 3 May/June 1982 197

[This page contains 1 picture or other non-text object]

Page 2 of 2

WINDOWING/IMAGE CROPPING (Cont'd)

FIG. 2

EOC I.-0 SIGNAL

TRANSITION AT

END OF COUNT

EOC 0-4 SIGNAL

TRANSITION AT

END OFCOUNT

t/

EOC 1-0 SIGNAL C

TRANSITION AT -

END OF COUNT

- A

-

- &

l6 I

4.

RIGHT MARGIN

+ TOTAL

131

TRANSITION AT END OFCOUNT

TWO-DIMENSIONAL WINDOWING...