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Merged
merged 8 commits into from
Aug 8, 2023
Merged

Text recognition crnn #176

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b1c7531
rcnn only for EN
LaurentBerger Jun 13, 2023
ff21424
review 1
LaurentBerger Jun 15, 2023
47e96f9
add readme.md
LaurentBerger Jun 19, 2023
78954be
rename file
LaurentBerger Jun 19, 2023
ca5bf45
review 2
LaurentBerger Jun 20, 2023
4ecba35
review 3
LaurentBerger Jun 20, 2023
c7181ed
option v
LaurentBerger Jun 20, 2023
8694617
review 4
LaurentBerger Jun 24, 2023
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29 changes: 29 additions & 0 deletions models/text_recognition_crnn/CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@
cmake_minimum_required(VERSION 3.24)
set(project_name "opencv_zoo_text_recognition_crnn")

PROJECT (${project_name})

set(OPENCV_VERSION "4.7.0")
set(OPENCV_INSTALLATION_PATH "" CACHE PATH "Where to look for OpenCV installation")
find_package(OpenCV ${OPENCV_VERSION} REQUIRED HINTS ${OPENCV_INSTALLATION_PATH})
# Find OpenCV, you may need to set OpenCV_DIR variable
# to the absolute path to the directory containing OpenCVConfig.cmake file
# via the command line or GUI

file(GLOB SourceFile
"demo.cpp")
# If the package has been found, several variables will
# be set, you can find the full list with descriptions
# in the OpenCVConfig.cmake file.
# Print some message showing some of them
message(STATUS "OpenCV library status:")
message(STATUS " config: ${OpenCV_DIR}")
message(STATUS " version: ${OpenCV_VERSION}")
message(STATUS " libraries: ${OpenCV_LIBS}")
message(STATUS " include path: ${OpenCV_INCLUDE_DIRS}")

# Declare the executable target built from your sources
add_executable(${project_name} ${SourceFile})

# Link your application with OpenCV libraries
target_link_libraries(${project_name} PRIVATE ${OpenCV_LIBS})
31 changes: 29 additions & 2 deletions models/text_recognition_crnn/README.md
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Expand Up @@ -36,6 +36,8 @@ Note:
- Try `text_recognition_CRNN_CH_2021sep.onnx` with `charset_94_CH.txt`
- Try `text_recognition_CRNN_CN_2021sep.onnx` with `charset_3944_CN.txt`.

### Python

Run the demo detecting English:

```shell
Expand All @@ -52,13 +54,38 @@ Run the demo detecting Chinese:

```shell
# detect on camera input
python demo.py --model text_recognition_CRNN_CN_2021nov.onnx --charset charset_3944_CN.txt
python demo.py --model text_recognition_CRNN_CN_2021nov.onnx
# detect on an image
python demo.py --input /path/to/image --model text_recognition_CRNN_CN_2021nov.onnx --charset charset_3944_CN.txt
python demo.py --input /path/to/image --model text_recognition_CRNN_CN_2021nov.onnx

# get help regarding various parameters
python demo.py --help
```
### C++

Install latest OpenCV and CMake >= 3.24.0 to get started with:

```shell
# detect on camera input
./build/opencv_zoo_text_recognition_crnn
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this command can't recognize from camera.

# detect on an image
./build/opencv_zoo_text_recognition_crnn --input /path/to/image -v
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need to use -i=/path/to/image or --input=/path/to/image

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using -v flag can't show the image

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./build/opencv_zoo_text_recognition_crnn -v=0
show result as text but won't stop without ctrl+c. Must I add a counter to stop after 100 inferences?

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I think just be as consistent as possible with other demos

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using -v flag can't show the image

Just modify the doc here to make sure the commands work. It does not worth making 100% same behavior as Python demos.


# get help regarding various parameters
./build/opencv_zoo_text_recognition_crnn --help
```

Run the demo detecting Chinese:

```shell
# detect on camera input
./build/opencv_zoo_text_recognition_crnn --model=text_recognition_CRNN_CN_2021nov.onnx --charset=charset_3944_CN.txt
# detect on an image
./build/opencv_zoo_text_recognition_crnn --input=/path/to/image --model=text_recognition_CRNN_CN_2021nov.onnx --charset=charset_3944_CN.txt
Comment on lines +82 to +84
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--charset=charset_3944_CN.txt I dont see we have this file in this pull request.

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May be there is something I don't understand : in readme

Selected model must match with the charset:

    Try text_recognition_CRNN_EN_2021sep.onnx with charset_36_EN.txt.
    Try text_recognition_CRNN_CH_2021sep.onnx with charset_94_CH.txt
    Try text_recognition_CRNN_CN_2021sep.onnx with charset_3944_CN.txt.

Then i understand that model gives charset to use then in code I use those line

        if (this->modelPath.find("_EN_") != string::npos)
            this->charset = loadCharset("CHARSET_EN_36");
        else if (this->modelPath.find("_CH_") != string::npos)
            this->charset = loadCharset("CHARSET_CH_94");
        else if (this->modelPath.find("_CN_") != string::npos)
            this->charset = loadCharset("CHARSET_CN_3944");
        else
        {
            CV_Error(-1, "Charset not supported! Exiting ...");

        }

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We integrated charset characters into the class wrapper crnn.py from separate files, but forgot to update the information in readme. So the current readme is outdated, you might update in this pull request as well.


# get help regarding various parameters
./build/opencv_zoo_text_recognition_crnn --help


### Examples

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