MTK手势拍照识别率如何调整

1. 调整GDLevel
灵敏度（DR）提高了，误判率（FPR）也会提高。
GDLevel (defalt 1) 0~4: 0 (High DR, High FPR)
4 (Low DR, Low FPR)
请调整GDLevel.
alps/mediatek/custom/common/hal/CAMERA/camera/camera_custom_gesture.cpp
void get_gesture_CustomizeData(GS_Customize_PARA *GSDataOut)
{
GSDataOut->GDLevel = 4;
}
92 KK1.MP1需要打 Patch：ALPS01650682.

2. 如果按照1 调整之后，对识别率还不满意的话
更改gs_hal.cpp
2.1新增以下定义

1. #define DUMP_GS_DETECTED_FRAME (1)
   
2. // While count detected frames > DELAY_GS_COUNT_DETECTED
   
3. // in DELAY_GS_COUNT_IN_FRAMES duration, consider there is
   
4. // a gesture in preview, otherwise consider it is false positive.
   
5. #define USE_DELAY_GS_OUTPUT (1)
   
6. #define DELAY_GS_COUNT_DETECTED (3)
   
7. #define DELAY_GS_COUNT_IN_FRAMES (6)
   
8. static MUINT32 g_GSDetectedFrames;
   
9. static MUINT32 g_GSCountFrames;

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其中新增的这几个值就是起调节作用的。
當USE_DELAY_GS_OUTPUT enable才有用
DELAY_GS_COUNT_DETECTED 越大, 侦测誤判率越低, 但偵測率也會下降, 建议 1 <=
DELAY_GS_COUNT_DETECTED <= 3
DELAY_GS_COUNT_IN_FRAMES越大, 侦测率會變高, 但誤判率也會上升, 建议 6 <=
DELAY_GS_COUNT_IN_FRAMES
2.2getInstance() 方法中添加

1. getInstance()
   
2. {
   
3. ... ...
   
4. if ( 0 == oldCount )
   
5. {
   
6. if ( ！ pHalGS )
   
7. {
   
8. MY_LOGW("Get Instance Warning！");
   
9. }
   
10. pHalGS = new halGS();
    
11. //add start
    
12. g_GSDetectedFrames = 0;
    
13. g_GSCountFrames = 0;
    
14. //add end
    
15. }
    
16. ... ...
    
17. }

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2.3添加

1. halGS::halGSDo(
   
2. MUINT8 *ImageBuffer2, //Preview Size Image
   
3. MINT32 rRotation_Info
   
4. )
   
5. {
   
6. ... ...
   
7. //result DetectResult[MAX_FACE_NUM];
   
8. GD_RESULT DetectResult[MAX_FACE_NUM];
   
9. m_pmtkGSObj->GdGetResult( (MUINT8 *)&DetectResult, GD_TRACKING_DISPLAY);
   
10. //add start
    
11. #if DUMP_GS_DETECTED_FRAME
    
12. if (DetectResult->face_num) {
    
13. char szFileName[100]={'\0'};
    
14. FILE * pRawFp;
    
15. int i4WriteCnt;
    
16. static int count = 0;
    
17. MY_LOGD("Gsture is detected...dump result");
    
18. sprintf(szFileName, "/sdcard/GSsrc_%04dx%04d_%04d.raw", m_GSW, m_GSH, count);
    
19. count++;
    
20. pRawFp = fopen(szFileName, "wb");
    
21. if (NULL == pRawFp )
    
22. {
    
23. MY_LOGD("Can't open file to save RAW Image\n");
    
24. while(1);
    
25. }
    
26. i4WriteCnt = fwrite((void *)ImageBuffer2,1, (m_GSW * m_GSH),pRawFp);
    
27. fflush(pRawFp);
    
28. fclose(pRawFp);
    
29. }
    
30. #endif
    
31. //add end
    
32. static int last_face_num;
    
33. ... ...
    
34. }

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2.4添加

1. halGS::halGSGetGestureResult(
   
2. MtkCameraFaceMetadata *GS_result
   
3. ) {
   
4. ... ...
   
5. GSResult_Num = GS_result->number_of_faces;
   
6. //add start
   
7. MY_LOGD("Gesture detect numbers : %d", GSResult_Num);
   
8. #if USE_DELAY_GS_OUTPUT
   
9. if (g_GSDetectedFrames > DELAY_GS_COUNT_DETECTED && GS_result->number_of_faces == 0) {
   
10. g_GSDetectedFrames = 0;
    
11. g_GSCountFrames = 0;
    
12. }
    
13. if (GS_result->number_of_faces > 0 && g_GSDetectedFrames <= DELAY_GS_COUNT_DETECTED) {
    
14. if (g_GSDetectedFrames == 0) {
    
15. g_GSCountFrames = 0;
    
16. }
    
17. g_GSDetectedFrames++;
    
18. }
    
19. if (g_GSDetectedFrames > 0 && g_GSDetectedFrames <= DELAY_GS_COUNT_DETECTED) {
    
20. g_GSCountFrames++;
    
21. if (g_GSCountFrames > DELAY_GS_COUNT_IN_FRAMES) {
    
22. g_GSCountFrames = 0;
    
23. g_GSDetectedFrames = 0;
    
24. } }
    
25. if (g_GSDetectedFrames <= DELAY_GS_COUNT_DETECTED) {
    
26. GSResult_Num = GS_result->number_of_faces = faceCnt = 0;
    
27. }
    
28. MY_LOGD("After process delay output");
    
29. MY_LOGD("detected num : %d, detected count : %d, delay duration : %d", GSResult_Num,
    
30. g_GSDetectedFrames, g_GSCountFrames);
    
31. #endif
    
32. //add end
    
33. for(i=0;i<MAX_FACE_NUM;i++)
    
34. ... ...
    
35. }

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3. 如果经过以上两步的调节，如果还无法满足您的需要的话，建议直接不要这个feature 了。
因为手势设别本身就是存在limit ,没办法100% 识别，一定存在误识别率。
另外延伸另外一个问题，如果要开美颜的时候，也做手势识别，请修改以下文件：
4. 修改FeaturePipe.vFB.h
FeaturePipeFDNode 类中新增以下几个private 变量
MUINT32 mGDWidth;
MUINT32 mGDHeight;
MBOOL mGDInited;

5. 修改FeaturePipe.vFB.cpp
修改FeaturePipeFdNode 类
5.1

1. FeaturePipeFdNode::FeaturePipeFdNode(
   
2. ... ...
   
3. mFDHeight(0),
   
4. mFDInited(MFALSE),
   
5. //add start
   
6. mGDWidth(0),
   
7. mGDHeight(0),
   
8. mGDInited(MFALSE)
   
9. //add end
   
10. ... ...
    
11. }

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5.2

1. FeaturePipeFdNode::
   
2. onUninit()
   
3. {
   
4. ... ...
   
5. if(mpGDHalObj ！= NULL)
   
6. {
   
7. LOG_DBG("GD_destroy(vFB)");
   
8. //add start
   
9. if(mGDInited)
   
10. {
    
11. LOG_DBG("GD_Uninit(vFB)");
    
12. mpGDHalObj->halGSUninit();
    
13. }
    
14. //add end
    
15. //mpGDHalObj->halGSUninit();
    
16. mpGDHalObj->destroyInstance();
    
17. mpGDHalObj = NULL;
    
18. }
    
19. ... ...
    
20. }

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5.3

1. FeaturePipeFdNode::doGestureShot(IImageBuffer* pImageBuffer)
   
2. {
   
3. MUINT32 SrcW = pImageBuffer->getImgSize().w;
   
4. MUINT32 SrcH = pImageBuffer->getImgSize().h;
   
5. MUINT32 GD_Result = 0;
   
6. //add start
   
7. if (mGDInited &&
   
8. (mGDWidth ！= 0) &&
   
9. ((mGDWidth ！= SrcW) ||
   
10. (mGDHeight ！= SrcH)))
    
11. {
    
12. mpGDHalObj->halGSUninit();
    
13. mGDInited = MFALSE;
    
14. }
    
15. //Initial GD Start
    
16. if(！mGDInited) {
    
17. //add end
    
18. LOG_DBG("StartGD_Init(vFB): SrcW:%d, SrcH:%d", SrcW, SrcH);
    
19. mpGDHalObj->halGSInit(SrcW, SrcH, (MUINT8 *) mpFDWorkingBuffer, FD_WORKING_BUF_SIZE);
    
20. //add start
    
21. mGDInited = MTRUE;
    
22. }
    
23. mGDWidth = SrcW;
    
24. mGDHeight = SrcH;
    
25. //add end
    
26. mpGDHalObj->halGSDo((MUINT8 *)mFDYBuffer, mRotation);
    
27. GD_Result = mpGDHalObj->halGSGetGestureResult(&mGSFaceMetadata);
    
28. LOG_DBG("Gesture Shot result %d", GD_Result);
    
29. //delete
    
30. //mpGDHalObj->halGSUninit();
    
31. ... ...
    
32. }

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