Difference between revisions of "Function:RGB2Gray"

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(Created page with "__NOTOC__ Converts an RGB image to gray scale using fixed transform coefficients ===Function=== {| |style="font-size:150%;"| <syntaxhighlight lang="cpp"> CuviStatus rgb2Gray(C...")
 
 
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__NOTOC__
__NOTOC__
Converts an RGB image to gray scale using fixed transform coefficients
Converts an RGB image to gray scale using fixed or custom transform coefficients
===Function===
====Function====
{|
{|
|style="font-size:150%;"|
|style="font-size:100%;"|
<syntaxhighlight lang="cpp">
<syntaxhighlight lang="cpp">
CuviStatus rgb2Gray(CuviImage* srcImage,
CuviStatus rgb2gray(const CuviImage& src,
                     CuviImage* dstImage,
                     CuviImage& dst,
                     CuviStream* stream = NULL);
                     const CuviStream& stream = CuviStream());
 
CuviStatus rgb2gray(const CuviImage& src,
                    CuviImage& dst,
                    const CuviScalar& coeffs,
                    const CuviStream& stream = CuviStream());
 
</syntaxhighlight>
</syntaxhighlight>
|}
|}


 
====Parameters====
===Parameters===
{|
 
|style="font-size:75%;"|
{|class="wikitable"
{|class="wikitable"
|-
|-
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! Description
! Description
|-
|-
| srcImage
| src
| CuviImage*
| CuviImage&
| Input 3-channel image
| Input 3 channel image
|-
|-
| dstImage
| dst
| CuviImage*
| CuviImage&
| Output single channel image
| Output single channel image
|-
| coeffs
| CuviScalar&
| Custom transformation coefficients
|-
|-
| stream
| stream
| CuviStream*
| CuviStream&
| GPU stream ID for execution
| GPU stream ID for execution
 
|}
|}
|}


 
====Image Type Support====
 
{|
===Image Type Support===
|style="font-size:75%;"|
 
{| class="wikitable"
{| class="wikitable"
|-
|-
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| 16uC3
| 16uC3
| 16uC1
| 16uC1
|-
| 32fC3
| 32fC1
|}
|}
===Sample===
{|
|-
|[[File:ColoIn.jpg|frame|Color Image]]
|[[File:RGB2GrayOut.jpg|frame|Output Gray Image]]
|}
|}


====Sample====
[[File:ColoIn.jpg|none|frame|Color Image]]
<br/>
[[File:RGB2GrayOut.jpg|none|frame|Output Gray Image]]
<br/>


 
====Example====
===Example===
{|
{|
|style="font-size:150%;"|
|style="font-size:100%;"|
<syntaxhighlight lang="cpp">
<syntaxhighlight lang="cpp">


CuviImage* gimg = new CuviImage(size,img->depth,img->nChannels);
CuviImage gimg = cuvi::io::loadImage(path), gout;
CuviImage* gout = new CuviImage(size,img->depth,1);
 
//Uploading RGB image to GPU
gimg->upload(img->imageData,img->widthStep);


//function call
//Convert to gray-scale using standard coefficients
cuvi::colorOperations::color2Gray(gimg,gout);
cuvi::colorOperations::rgb2gray(gimg,gout);


//Convert to gray-scale using custom coefficients
CuviScalar coeffs(0.33, 0.33, 0.33);
cuvi::colorOperations::rgb2gray(gimg,gout, coeffs);
</syntaxhighlight>
</syntaxhighlight>
|}
|}

Latest revision as of 21:09, 18 October 2022

Converts an RGB image to gray scale using fixed or custom transform coefficients

Function

CuviStatus rgb2gray(const CuviImage& src,
                    CuviImage& dst,
                    const CuviStream& stream = CuviStream());

CuviStatus rgb2gray(const CuviImage& src,
                    CuviImage& dst,
                    const CuviScalar& coeffs,
                    const CuviStream& stream = CuviStream());

Parameters

Name Type Description
src CuviImage& Input 3 channel image
dst CuviImage& Output single channel image
coeffs CuviScalar& Custom transformation coefficients
stream CuviStream& GPU stream ID for execution

Image Type Support

Input Output
8uC3 8uC1
16uC3 16uC1
32fC3 32fC1

Sample

Error creating thumbnail: Unable to save thumbnail to destination
Color Image


Error creating thumbnail: Unable to save thumbnail to destination
Output Gray Image


Example

CuviImage gimg = cuvi::io::loadImage(path), gout;

//Convert to gray-scale using standard coefficients
cuvi::colorOperations::rgb2gray(gimg,gout);

//Convert to gray-scale using custom coefficients
CuviScalar coeffs(0.33, 0.33, 0.33);
cuvi::colorOperations::rgb2gray(gimg,gout, coeffs);
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