[Other] Remove useless OpenCV usage for PP-OCR. (PaddlePaddle#1375)

* Add Huawei Ascend NPU deploy through PaddleLite CANN

* Add NNAdapter interface for paddlelite

* Modify Huawei Ascend Cmake

* Update way for compiling Huawei Ascend NPU deployment

* remove UseLiteBackend in UseCANN

* Support compile python whlee

* Change names of nnadapter API

* Add nnadapter pybind and remove useless API

* Support Python deployment on Huawei Ascend NPU

* Fix links in readme

* Fix links in readme

* Update PPOCRv2/v3 examples

* Update auto compression configs

* Add neww quantization  support for paddleclas model

* Update quantized Yolov6s model download link

* Improve PPOCR comments

* Add models suppor for ascend

* Add PPOCR rec reszie for ascend

* fix conflict for ascend

* Rename CANN to Ascend

* Rename CANN to Ascend

* Improve ascend

* fix ascend bug

* improve ascend docs

* improve ascend docs

* improve ascend docs

* Add English doc for quantization

* Improve Ascend

* Improve Ascend

* Move ascend python demo

* Imporve ascend

* Fix PPOCR rec model bug

* Improve ascend

* Improve ascend

* Improve ascend

* Improve ascend

* Add  new paddleseg quantization support

* Add  new paddleseg quantization support

* Add  new paddleseg quantization support

* Add  new paddleseg quantization support

* Imporve ascend

* Imporve ascend

* Improve ascend

* acc eval script

* acc eval

* remove acc_eval from branch huawei

* Add detection and segmentation examples for Ascend deployment

* Add detection and segmentation examples for Ascend deployment

* Add Ascend model list

* Add ascend model list

* Add ascend model list

* Add ascend model list

* Add ascend model list

* Add ascend model list

* Add ascend model list

* Add PPOCR example for ascend deploy

* Imporve paddle lite compiliation

* Add FlyCV doc

* Add FlyCV doc

* Add FlyCV doc

* Imporve Ascend docs

* Imporve Ascend docs

* Improve PPOCR example

* Support Ascend deployment on X86 platform

* Improve Ascend docs

* Improve ascend

* Improve ascend

* Change Paddle Lite Ascend URL

* fix ascend docs

* fix ascend docs

* Fix Paddle Lite Ascend Lib

* Imporve compile of Ascend

* Imporve compile of Ascend

* fix paddle lite compile

* Remove useless opencv code for ocr

fastdeploy/vision/ocr/ppocr/utils/ocr_postprocess_op.h

@@ -20,7 +20,6 @@
 #include <ostream>
 #include <vector>
 #include "opencv2/core.hpp"
-#include "opencv2/imgcodecs.hpp"
 #include "opencv2/imgproc.hpp"
 
 #include <cstring>

fastdeploy/vision/ocr/ppocr/utils/ocr_utils.h

@@ -21,7 +21,6 @@
 #include "fastdeploy/vision/common/result.h"
 
 #include "opencv2/core.hpp"
-#include "opencv2/imgcodecs.hpp"
 #include "opencv2/imgproc.hpp"
 
 namespace fastdeploy {