OpenCV亮度对比度调节

static void on_track_lightness(int b, void* user_data)
{
	Mat image = *((Mat *)user_data);
	if (image.empty())
		return;
	Mat dst = Mat::zeros(image.size(), image.type());
	Mat m = Mat::zeros(image.size(), image.type());

	addWeighted(image, 1.0, m, 0, b, dst);

	imshow("亮度对比度调节", dst);
}

static void on_track_contrast(int b, void* user_data)
{
	Mat image = *((Mat *)user_data);
	Mat dst = Mat::zeros(image.size(), image.type());
	Mat m = Mat::zeros(image.size(), image.type());

	double contrast = b / 100.0;
	addWeighted(image, contrast, m, 0.0, 0, dst);

	imshow("亮度对比度调节", dst);
}

void on_pushButton_brightness_clicked()
{
	namedWindow("亮度对比度调节", WINDOW_AUTOSIZE);
	
	int lightness = 50;
	int max_value = 100;

	int contrast_value = 100;

	createTrackbar("Value Bar:", "亮度对比度调节", &lightness, max_value, on_track_lightness,(void*)(&img));
	createTrackbar("Constrast Bar:", "亮度对比度调节", &contrast_value, 200, on_track_contrast, (void*)(&img));
	on_track_lightness(50, &img);
}

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