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1c53fd3777
Consider QRCode ECI encoding #24426
### Pull Request Readiness Checklist
related: https://github.com/opencv/opencv/pull/24350#pullrequestreview-1661658421
1. Add `getEncoding` method to obtain ECI number
2. Add `detectAndDecodeBytes`, `decodeBytes`, `decodeBytesMulti`, `detectAndDecodeBytesMulti` methods in Python (return `bytes`) and Java (return `byte[]`)
3. Allow Python bytes to std::string conversion in general and add `encode(byte[] encoded_info, Mat qrcode)` in Java
Python example with Kanji encoding:
```python
img = cv.imread("test.png")
detect = cv.QRCodeDetector()
data, points, straight_qrcode = detect.detectAndDecodeBytes(img)
print(data)
print(detect.getEncoding(), cv.QRCodeEncoder_ECI_SHIFT_JIS)
print(data.decode("shift-jis"))
```
```
b'\x82\xb1\x82\xf1\x82\xc9\x82\xbf\x82\xcd\x90\xa2\x8aE'
20 20
こんにちは世界
```
source: ba4d6c859d/modules/objdetect/test/test_qrcode_encode.cpp (L332)
See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request
- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake
38 lines
956 B
C++
38 lines
956 B
C++
#ifdef HAVE_OPENCV_OBJDETECT
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#include "opencv2/objdetect.hpp"
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typedef QRCodeEncoder::Params QRCodeEncoder_Params;
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typedef HOGDescriptor::HistogramNormType HOGDescriptor_HistogramNormType;
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typedef HOGDescriptor::DescriptorStorageFormat HOGDescriptor_DescriptorStorageFormat;
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class NativeByteArray
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{
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public:
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inline NativeByteArray& operator=(const std::string& from) {
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val = from;
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return *this;
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}
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std::string val;
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};
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class vector_NativeByteArray : public std::vector<std::string> {};
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template<>
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PyObject* pyopencv_from(const NativeByteArray& from)
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{
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return PyBytes_FromStringAndSize(from.val.c_str(), from.val.size());
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}
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template<>
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PyObject* pyopencv_from(const vector_NativeByteArray& results)
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{
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PyObject* list = PyList_New(results.size());
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for(size_t i = 0; i < results.size(); ++i)
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PyList_SetItem(list, i, PyBytes_FromStringAndSize(results[i].c_str(), results[i].size()));
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return list;
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}
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#endif
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