Mixing
Increment the value of each pixel of an image
I have an image. I want to modify the image in such a way that the value of each pixel is increased by a particular margin. Next I want to save the newly created image and display it.
I tried changing each pixel value but was only able to set it to constant value. I don't want all the pixels to be constant but their value should increase by (lets say) 50.
#include <iostream>
#include "opencv2/highgui/highgui.hpp"
using namespace std;
using namespace cv;
int main()
{
Mat image;
image = imread("/home/rohit_136/Desktop/image.jpg",CV_LOAD_IMAGE_UNCHANGED);
for (int i = 0; i < image.cols; i++) {
for (int j = 0; j < image.rows; j++) {
Vec3b intensity = image.at<Vec3b>(j, i)=50
}
}
return 0;
}
c++ image c++11 opencv3.0
edited Mar 22 '17 at 19:54
Yakk - Adam Nevraumont
187k20198382
asked Mar 22 '17 at 19:05
RohitRohit
815
add a comment |
I have an image. I want to modify the image in such a way that the value of each pixel is increased by a particular margin. Next I want to save the newly created image and display it.
I tried changing each pixel value but was only able to set it to constant value. I don't want all the pixels to be constant but their value should increase by (lets say) 50.
#include <iostream>
#include "opencv2/highgui/highgui.hpp"
using namespace std;
using namespace cv;
int main()
{
Mat image;
image = imread("/home/rohit_136/Desktop/image.jpg",CV_LOAD_IMAGE_UNCHANGED);
for (int i = 0; i < image.cols; i++) {
for (int j = 0; j < image.rows; j++) {
Vec3b intensity = image.at<Vec3b>(j, i)=50
}
}
return 0;
}
c++ image c++11 opencv3.0
edited Mar 22 '17 at 19:54
Yakk - Adam Nevraumont
187k20198382
asked Mar 22 '17 at 19:05
RohitRohit
815
The code you wrote won't compile. When posting code, try to post actual code.
– Yakk - Adam Nevraumont
Mar 22 '17 at 19:55
add a comment |
I have an image. I want to modify the image in such a way that the value of each pixel is increased by a particular margin. Next I want to save the newly created image and display it.
I tried changing each pixel value but was only able to set it to constant value. I don't want all the pixels to be constant but their value should increase by (lets say) 50.
#include <iostream>
#include "opencv2/highgui/highgui.hpp"
using namespace std;
using namespace cv;
int main()
{
Mat image;
image = imread("/home/rohit_136/Desktop/image.jpg",CV_LOAD_IMAGE_UNCHANGED);
for (int i = 0; i < image.cols; i++) {
for (int j = 0; j < image.rows; j++) {
Vec3b intensity = image.at<Vec3b>(j, i)=50
}
}
return 0;
}
c++ image c++11 opencv3.0
edited Mar 22 '17 at 19:54
Yakk - Adam Nevraumont
187k20198382
asked Mar 22 '17 at 19:05
RohitRohit
815
I have an image. I want to modify the image in such a way that the value of each pixel is increased by a particular margin. Next I want to save the newly created image and display it.
I tried changing each pixel value but was only able to set it to constant value. I don't want all the pixels to be constant but their value should increase by (lets say) 50.
#include <iostream>
#include "opencv2/highgui/highgui.hpp"
using namespace std;
using namespace cv;
int main()
{
Mat image;
image = imread("/home/rohit_136/Desktop/image.jpg",CV_LOAD_IMAGE_UNCHANGED);
for (int i = 0; i < image.cols; i++) {
for (int j = 0; j < image.rows; j++) {
Vec3b intensity = image.at<Vec3b>(j, i)=50
}
}
return 0;
}
c++ image c++11 opencv3.0
c++ image c++11 opencv3.0
edited Mar 22 '17 at 19:54
Yakk - Adam Nevraumont
187k20198382
asked Mar 22 '17 at 19:05
RohitRohit
815
edited Mar 22 '17 at 19:54
Yakk - Adam Nevraumont
187k20198382
asked Mar 22 '17 at 19:05
RohitRohit
815
edited Mar 22 '17 at 19:54
Yakk - Adam Nevraumont
187k20198382
edited Mar 22 '17 at 19:54
Yakk - Adam Nevraumont
187k20198382
edited Mar 22 '17 at 19:54
Yakk - Adam Nevraumont
187k20198382
187k20198382
asked Mar 22 '17 at 19:05
RohitRohit
815
asked Mar 22 '17 at 19:05
RohitRohit
815
asked Mar 22 '17 at 19:05
RohitRohit
815
815
The code you wrote won't compile. When posting code, try to post actual code.
– Yakk - Adam Nevraumont
Mar 22 '17 at 19:55
add a comment |
The code you wrote won't compile. When posting code, try to post actual code.
– Yakk - Adam Nevraumont
Mar 22 '17 at 19:55
The code you wrote won't compile. When posting code, try to post actual code.
– Yakk - Adam Nevraumont
Mar 22 '17 at 19:55
The code you wrote won't compile. When posting code, try to post actual code.
– Yakk - Adam Nevraumont
Mar 22 '17 at 19:55
add a comment |
2 Answers
2
active
oldest
votes
Vec3b is a vector which contains 3 bytes (chars). Each byte denotes the value of an individual BGR (blue, green, red) or RGB channel. You should traverse this vector and modify each channel independently. Be careful, because we are talking about bytes, each byte should take a value between 0 and 255. I suggest setting a threshold for avoiding overflow.
Note: if you don't care about alpha channel, I suggest loading your image with CV_LOAD_IMAGE_COLOR. This will ensure that your image is loaded in the BGR format.
answered Mar 22 '17 at 20:28
Ervin SzilagyiErvin Szilagyi
1,4012517
add a comment |
cv::Mat Image =cv::imread("image.jpg");
uint8_t * orig_ptr = (uint8_t*)Image.data;
for (int y = 0; y < Image.rows; y++)
{
for (int x = 0; x < Image.cols; x++)
{
/*Reading Pizel Values*/
int R = orig_ptr[x * 3 + y*Image.step + 2];/*R -Pixel*/
int G = orig_ptr[x * 3 + y*Image.step + 1];/*G-Pixel*/
int B = orig_ptr[x * 3 + y*Image.step]; /*B-Pixel*/
/*Updating Values*/
orig_ptr[x * 3 + y*Image.step + 2] = cv::saturate_cast<uint8_t>(R + 50);
orig_ptr[x * 3 + y*Image.step + 1] =cv::saturate_cast<uint8_t>(G + 50);
orig_ptr[x * 3 + y*Image.step]=cv::saturate_cast<uint8_t>(B + 50);
}
}
answered Jan 1 at 6:57
niranjan reddyniranjan reddy
213
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Vec3b is a vector which contains 3 bytes (chars). Each byte denotes the value of an individual BGR (blue, green, red) or RGB channel. You should traverse this vector and modify each channel independently. Be careful, because we are talking about bytes, each byte should take a value between 0 and 255. I suggest setting a threshold for avoiding overflow.
Note: if you don't care about alpha channel, I suggest loading your image with CV_LOAD_IMAGE_COLOR. This will ensure that your image is loaded in the BGR format.
answered Mar 22 '17 at 20:28
Ervin SzilagyiErvin Szilagyi
1,4012517
add a comment |
Vec3b is a vector which contains 3 bytes (chars). Each byte denotes the value of an individual BGR (blue, green, red) or RGB channel. You should traverse this vector and modify each channel independently. Be careful, because we are talking about bytes, each byte should take a value between 0 and 255. I suggest setting a threshold for avoiding overflow.
Note: if you don't care about alpha channel, I suggest loading your image with CV_LOAD_IMAGE_COLOR. This will ensure that your image is loaded in the BGR format.
answered Mar 22 '17 at 20:28
Ervin SzilagyiErvin Szilagyi
1,4012517
add a comment |
Vec3b is a vector which contains 3 bytes (chars). Each byte denotes the value of an individual BGR (blue, green, red) or RGB channel. You should traverse this vector and modify each channel independently. Be careful, because we are talking about bytes, each byte should take a value between 0 and 255. I suggest setting a threshold for avoiding overflow.
Note: if you don't care about alpha channel, I suggest loading your image with CV_LOAD_IMAGE_COLOR. This will ensure that your image is loaded in the BGR format.
answered Mar 22 '17 at 20:28
Ervin SzilagyiErvin Szilagyi
1,4012517
Vec3b is a vector which contains 3 bytes (chars). Each byte denotes the value of an individual BGR (blue, green, red) or RGB channel. You should traverse this vector and modify each channel independently. Be careful, because we are talking about bytes, each byte should take a value between 0 and 255. I suggest setting a threshold for avoiding overflow.
Note: if you don't care about alpha channel, I suggest loading your image with CV_LOAD_IMAGE_COLOR. This will ensure that your image is loaded in the BGR format.
answered Mar 22 '17 at 20:28
Ervin SzilagyiErvin Szilagyi
1,4012517
answered Mar 22 '17 at 20:28
Ervin SzilagyiErvin Szilagyi
1,4012517
answered Mar 22 '17 at 20:28
Ervin SzilagyiErvin Szilagyi
1,4012517
answered Mar 22 '17 at 20:28
Ervin SzilagyiErvin Szilagyi
1,4012517
1,4012517
add a comment |
add a comment |
cv::Mat Image =cv::imread("image.jpg");
uint8_t * orig_ptr = (uint8_t*)Image.data;
for (int y = 0; y < Image.rows; y++)
{
for (int x = 0; x < Image.cols; x++)
{
/*Reading Pizel Values*/
int R = orig_ptr[x * 3 + y*Image.step + 2];/*R -Pixel*/
int G = orig_ptr[x * 3 + y*Image.step + 1];/*G-Pixel*/
int B = orig_ptr[x * 3 + y*Image.step]; /*B-Pixel*/
/*Updating Values*/
orig_ptr[x * 3 + y*Image.step + 2] = cv::saturate_cast<uint8_t>(R + 50);
orig_ptr[x * 3 + y*Image.step + 1] =cv::saturate_cast<uint8_t>(G + 50);
orig_ptr[x * 3 + y*Image.step]=cv::saturate_cast<uint8_t>(B + 50);
}
}
answered Jan 1 at 6:57
niranjan reddyniranjan reddy
213
add a comment |
cv::Mat Image =cv::imread("image.jpg");
uint8_t * orig_ptr = (uint8_t*)Image.data;
for (int y = 0; y < Image.rows; y++)
{
for (int x = 0; x < Image.cols; x++)
{
/*Reading Pizel Values*/
int R = orig_ptr[x * 3 + y*Image.step + 2];/*R -Pixel*/
int G = orig_ptr[x * 3 + y*Image.step + 1];/*G-Pixel*/
int B = orig_ptr[x * 3 + y*Image.step]; /*B-Pixel*/
/*Updating Values*/
orig_ptr[x * 3 + y*Image.step + 2] = cv::saturate_cast<uint8_t>(R + 50);
orig_ptr[x * 3 + y*Image.step + 1] =cv::saturate_cast<uint8_t>(G + 50);
orig_ptr[x * 3 + y*Image.step]=cv::saturate_cast<uint8_t>(B + 50);
}
}
answered Jan 1 at 6:57
niranjan reddyniranjan reddy
213
add a comment |
cv::Mat Image =cv::imread("image.jpg");
uint8_t * orig_ptr = (uint8_t*)Image.data;
for (int y = 0; y < Image.rows; y++)
{
for (int x = 0; x < Image.cols; x++)
{
/*Reading Pizel Values*/
int R = orig_ptr[x * 3 + y*Image.step + 2];/*R -Pixel*/
int G = orig_ptr[x * 3 + y*Image.step + 1];/*G-Pixel*/
int B = orig_ptr[x * 3 + y*Image.step]; /*B-Pixel*/
/*Updating Values*/
orig_ptr[x * 3 + y*Image.step + 2] = cv::saturate_cast<uint8_t>(R + 50);
orig_ptr[x * 3 + y*Image.step + 1] =cv::saturate_cast<uint8_t>(G + 50);
orig_ptr[x * 3 + y*Image.step]=cv::saturate_cast<uint8_t>(B + 50);
}
}
answered Jan 1 at 6:57
niranjan reddyniranjan reddy
213
cv::Mat Image =cv::imread("image.jpg");
uint8_t * orig_ptr = (uint8_t*)Image.data;
for (int y = 0; y < Image.rows; y++)
{
for (int x = 0; x < Image.cols; x++)
{
/*Reading Pizel Values*/
int R = orig_ptr[x * 3 + y*Image.step + 2];/*R -Pixel*/
int G = orig_ptr[x * 3 + y*Image.step + 1];/*G-Pixel*/
int B = orig_ptr[x * 3 + y*Image.step]; /*B-Pixel*/
/*Updating Values*/
orig_ptr[x * 3 + y*Image.step + 2] = cv::saturate_cast<uint8_t>(R + 50);
orig_ptr[x * 3 + y*Image.step + 1] =cv::saturate_cast<uint8_t>(G + 50);
orig_ptr[x * 3 + y*Image.step]=cv::saturate_cast<uint8_t>(B + 50);
}
}
answered Jan 1 at 6:57
niranjan reddyniranjan reddy
213
answered Jan 1 at 6:57
niranjan reddyniranjan reddy
213
answered Jan 1 at 6:57
niranjan reddyniranjan reddy
213
answered Jan 1 at 6:57
niranjan reddyniranjan reddy
213
213
add a comment |
add a comment |
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The code you wrote won't compile. When posting code, try to post actual code.
– Yakk - Adam Nevraumont
Mar 22 '17 at 19:55