Cirrus Logic CS485 Dokumentacja Pobierz pdf (Strona 215)

Histogram, Threshold, and Compare Functions

10-17

GreaterS

Tests if the image’s pixel values

are greater than an integer

scalar value.

IPLStatus iplGreaterS (IplImage*

src

, int

IplImage*

dst

);

src

Thesourceimage.

The integer scalar value to be compared with

pixel values.

dst

The resultant 1-bit image.

Discussion

The function iplGreaterS() compares the pixels of the input image

src

and a scalar value

for “greater than” and writes the results to a 1-bit

image

dst

. If a pixel’s value is greater than

, then the corresponding pixel

dst

is set to 1; otherwise the pixel in

dst

is set to 0.

The function supports all pixel data types except 32-bit floating-point data.

(For images with floating-point data, use the function

iplGreaterSFP()

described on the next page.) If the source image COI is not set, a pixel is

considered to be “greater” than

only if each channel in the pixel is greater

than

. If the COI is set, the function compares

and the pixel values in the

COI.

The function returns

IPL_StsOK if the compare operation is successful.

If you pass an image with data of an unsupported type or a null pointer, the

function does not perform the compare operation and returns an error status

code.

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