LF2301JC25 datasheet(5/18 Pages) LODEV

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DEVICES INCORPORATED

Video Imaging Products

2-5

LF2301

Image Resampling Sequencer

08/16/2000–LDS.2301-H

addresses. An example of an ITS

implemented with two LF2301s is

shown in Figure 1. In this system the

following components are used: two

LF2301s, a multiplier-accumulator

(MAC), interpolation coefficient RAM,

and source/target image RAM.

Maximum image size is 4096 x 4096

pixels. Data word size is determined

by the word size of the external RAM.

A typical ITS performs image transfor-

mations as follows:

a. The LF2301s generate sequential

pixel addresses (left to right, top to

bottom) which fill the rectangle in the

target image RAM defined by

(UMIN,VMIN) and (UMAX +1, VMAX).

It is important to note that the U value

of the last pixel address on each line of

the target RAM is UMAX + 1.

b. The LF2301s calculate the address

of the corresponding pixel in the

source image RAM for each target

pixel address generated.

c. If interpolation is needed, the

external MAC sums the products of

the source pixels and the interpola-

tion coefficients. Control signals for

the MAC and address signals for the

interpolation coefficient RAM are

provided by the LF2301s.

d. The new pixel value is written into

the target image RAM.

The LF2301s generate source pixel

addresses according to the following

general second order equations:

x = Au2 + Bu + Cuv + Dv2 + Ev + F

y = Gu2 + Hu + Kuv + Lv2 + Mv + N

where (x,y) and (u,v) are the source

and target coordinates respectively.

A through N are user-defined param-

eters. The actual second order equa-

tions used are shown in Figure 3.

d x

dudv

d x

m – m

n – n

n +

mn +

d y

dudv

d y

m – m

n – n

n +

mn +

+ FOV CAY(w)

FOV m CAY(ker)

+ FOV CAX(w)

FOV m CAX(ker)

UMIN +

VMIN +

NOTE:

m – m

APPROXIMATES THE EXPONENTIAL CHARACTERISTIC OF

FIGURE 3. ADDRESS TRANSFORMATION EQUATIONS

FIGURE 2. TEST MODE DATA ROUTING

SIGN

CA3-0

CA7-4

X11-0/T11-0

28-BIT INTERNAL

ACCUMULATOR

WALK COUNTER

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