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// Copyright (c) 2012-2017 VideoStitch SAS
// Copyright (c) 2018 stitchEm
#include "compressionUtils.hpp"
#include "geometryProcessingUtils.hpp"
#include "polylineEncodingUtils.hpp"
#include "util/base64.hpp"
namespace VideoStitch {
namespace Util {
float Compression::binaryDifference(const std::vector<unsigned char>& im0, const std::vector<unsigned char>& im1) {
if (im0.size() == 0) {
return 0.0f;
}
float diff = 0.0f;
for (size_t i = 0; i < im0.size(); i++) {
diff += std::abs(float(im0[i]) - float(im1[i]));
}
return diff / im0.size();
}
Status Compression::polylineEncodeBinaryMask(const int width, const int height, const std::vector<unsigned char>& data,
std::string& values) {
std::vector<std::vector<cv::Point>> contours;
const cv::Size size(width, height);
values = std::string("");
if (width * height != (int)data.size()) {
return {Origin::Input, ErrType::InvalidConfiguration,
"Corrupted input mask in polylines encoding (width * height != data.size())"};
}
FAIL_RETURN(
Util::GeometryProcessing::findImageContours<unsigned char>(size, data, 1, contours, CV_CHAIN_APPROX_TC89_KCOS));
std::vector<int> encodedSizes;
for (size_t i = 0; i < contours.size(); i++) {
std::string contourEncoded;
Util::PolylineEncoding::polylineEncode(contours[i], contourEncoded);
encodedSizes.push_back((int)contourEncoded.size());
values += contourEncoded;
}
// Encode vector info
std::string vectorInfo = PolylineEncoding::polylineEncodeValue((int32_t)encodedSizes.size());
for (size_t i = 0; i < encodedSizes.size(); i++) {
vectorInfo += PolylineEncoding::polylineEncodeValue(encodedSizes[i]);
}
values = vectorInfo + values;
return Status::OK();
}
Status Compression::polylineDecodeBinaryMask(const int width, const int height, const std::string& values,
std::vector<unsigned char>& data, const bool toBinary) {
std::vector<std::vector<cv::Point>> points;
// Decode all components
points.clear();
PolylineEncoding::polylineDecodePolygon(values, points);
const cv::Size size(width, height);
if (width * height != (int)data.size()) {
data.resize(width * height, 0);
}
FAIL_RETURN(Util::GeometryProcessing::drawPolygon(size, points, data));
if (toBinary) {
std::transform(data.begin(), data.end(), data.begin(),
[](unsigned char d) -> unsigned char { return (d == 255) ? 1 : 0; });
}
return Status::OK();
}
Status Compression::polylineEncodeBinaryMask(const int width, const int height, const std::string& data,
std::string& values) {
std::vector<unsigned char> v;
std::copy(data.begin(), data.end(), std::back_inserter(v));
return polylineEncodeBinaryMask(width, height, v, values);
}
Status Compression::polylineDecodeBinaryMask(const int width, const int height, const std::string& values,
std::string& data) {
std::vector<unsigned char> v;
FAIL_RETURN(polylineDecodeBinaryMask(width, height, values, v));
data = std::string("");
std::copy(v.begin(), v.end(), std::back_inserter(data));
return Status::OK();
}
Status Compression::convertMaskToEncodedMasks(const int width, const int height, const uint32_t* const fullData,
std::vector<std::string>& datas) {
// Find the maximum number
uint32_t dataMax = *std::max_element(fullData, fullData + (width * height));
// Get the position of max-bit;
int count = 0;
while (dataMax > 0) {
dataMax = dataMax >> 1;
count++;
}
datas.clear();
std::vector<unsigned char> originalData;
originalData.resize(width * height);
for (int i = 0; i < count; i++) {
uint32_t mask = 1 << i;
for (int j = 0; j < width * height; j++) {
originalData[j] = (fullData[j] & mask) ? 1 : 0;
}
std::string data;
FAIL_RETURN(Util::Compression::polylineEncodeBinaryMask(width, height, originalData, data));
datas.push_back(data);
}
return Status::OK();
}
Status Compression::convertEncodedMasksToMask(const int width, const int height, const std::vector<std::string>& datas,
std::vector<uint32_t>& fullData) {
if (width * height != (int)fullData.size()) {
fullData.resize(width * height, 0);
}
std::vector<unsigned char> originalMask;
for (size_t i = 0; i < datas.size(); i++) {
FAIL_RETURN(Util::Compression::polylineDecodeBinaryMask(width, height, datas[i], originalMask, false));
if (width * height != (int)originalMask.size()) {
return {Origin::Input, ErrType::InvalidConfiguration, "Encoded mask is invalid."};
}
if (i == 0) {
for (size_t j = 0; j < originalMask.size(); j++) {
fullData[j] = (originalMask[j] == 255) ? (1 << i) : 0;
}
} else {
for (size_t j = 0; j < originalMask.size(); j++) {
fullData[j] |= (originalMask[j] == 255) ? (1 << i) : 0;
}
}
}
return Status::OK();
}
} // namespace Util
} // namespace VideoStitch