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Update answer_26.cpp #30

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Update answer_26.cpp #30

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7dff196
Update answer_26.cpp
jamery-huang May 15, 2020
8733f4f
Update answer_6.cpp
jamery-huang Dec 31, 2020
2e31257
Need some protections.
jamery-huang Sep 16, 2021
86e8ef3
Consider grey level 255.
jamery-huang Sep 18, 2021
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4 changes: 2 additions & 2 deletions Question_01_10/answers_cpp/answer_6.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6,8 +6,8 @@

// Dedcrease color
cv::Mat decrease_color(cv::Mat img){
int height = img.cols;
int width = img.rows;
int width = img.cols;
int height = img.rows;
int channel = img.channels();

cv::Mat out = cv::Mat::zeros(height, width, CV_8UC3);
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31 changes: 18 additions & 13 deletions Question_11_20/answers_cpp/answer_11.cpp
100644 → 100755
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Expand Up @@ -24,20 +24,25 @@ cv::Mat mean_filter(cv::Mat img, int kernel_size){
for (int y = 0; y < height; y++){
for (int x = 0; x < width; x++){
for (int c = 0; c < channel; c++){
v = 0;

// get pixel sum
for (int dy = -pad; dy < pad + 1; dy++){
for (int dx = -pad; dx < pad + 1; dx++){
if (((y + dy) >= 0) && ((x + dx) >= 0)){
v += (int)img.at<cv::Vec3b>(y + dy, x + dx)[c];
}
}
}
v = 0;
count = 0;

// get pixel sum
for (int dy = -pad; dy < pad + 1; dy++){
for (int dx = -pad; dx < pad + 1; dx++){
if (((y + dy) >= 0) && ((x + dx) >= 0)
&& ((y + dy) < height) && ((x + dx) < width)){
v += (int)img.at<cv::Vec3b>(y + dy, x + dx)[c];
count++;
}
}
}

// assign mean value
v /= (kernel_size * kernel_size);
out.at<cv::Vec3b>(y, x)[c] = (uchar)v;
// assign mean value
if (count > 0) {
v /= count;
out.at<cv::Vec3b>(y, x)[c] = (uchar)v;
}
}
}
}
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6 changes: 3 additions & 3 deletions Question_21_30/answers_cpp/answer_23.cpp
100644 → 100755
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Expand Up @@ -17,14 +17,14 @@ cv::Mat histogram_equalization(cv::Mat img){

// histogram equalization hyper-parameters
double Zmax = 255;
double hist[255];
double hist[256];
double S = height * width * channel;
int val;
double hist_sum = 0;


// histogram initialization
for (int i = 0; i < 255; i++){
for (int i = 0; i < 256; i++){
hist[i] = 0;
}

Expand All @@ -46,7 +46,7 @@ cv::Mat histogram_equalization(cv::Mat img){

// get histogram sum <= current pixel value
hist_sum = 0;
for (int l = 0; l < val; l++){
for (int l = 0; l <= val; l++){
hist_sum += hist[l];
}
// assign equalized value
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2 changes: 1 addition & 1 deletion Question_21_30/answers_cpp/answer_26.cpp
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Expand Up @@ -38,7 +38,7 @@ cv::Mat bilinear(cv::Mat img, double rx, double ry){
val = (1. - dx) * (1. - dy) * img.at<cv::Vec3b>(y_before, x_before)[c] +
dx * (1. - dy) * img.at<cv::Vec3b>(y_before, x_before + 1)[c] +
(1. - dx) * dy * img.at<cv::Vec3b>(y_before + 1, x_before)[c] +
dx * dy * img.at<cv::Vec3b>(y_before + 1, x_before)[c];
dx * dy * img.at<cv::Vec3b>(y_before + 1, x_before + 1)[c];

// assign pixel to new position
out.at<cv::Vec3b>(y, x)[c] = (uchar)val;
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