HW2 資工三乙 01360681 許智綱

一開始點選自己要的圖片

                                                           然後畫出機率密度函數圖(PDF)

                                                            接著畫出累積分佈函數圖(CDF)
                                                                        PDF的圖被覆蓋住

                                                                  清除PDF後畫CDF

                                                                     用另一張圖來試

以下是C#做出來的效果

這裡做的是把圖的寬跟高用iImageWidth及iImageHeight來表示

void __fastcall TForm1::Image1Click(TObject *Sender){

  if(OpenPictureDialog1->Execute())

Image2->Picture->LoadFromFile(OpenPictureDialog1->FileName);

iImageWidth=Image2->Picture->Width;

iImageHeight=Image2->Picture->Height;

}

//---------------------------------------------------------------------------

void __fastcall TForm1::HistogramClick(TObject *Sender)

{

for(i=0; i<=255; i++)

{

arr_Blue[i] = 0;

arr_Green[i] = 0;

arr_Red[i] = 0;

}

          把陣列裡的數值歸零

for(j=0; j<iImageHeight; j++)

{

bPtrImageRow = (Byte *)Image2->Picture->Bitmap->ScanLine[j];

for(int i=0; i<iImageWidth; i++)

{

arr_Red[bPtrImageRow[3*i+2]]++;

arr_Green[bPtrImageRow[3*i+1]]++;

arr_Blue[bPtrImageRow[3*i+0]]++;

}

}

        計算出三個色彩中數值0-255所分別出現的次數

for(i=0; i<=255; i++)

{

Image6->Canvas->Pen->Color = clRed;

Image6->Canvas->MoveTo(i,150);

Image6->Canvas->LineTo(i,150 - arr_Red[i]/80);

Image5->Canvas->Pen->Color = clGreen;

Image5->Canvas->MoveTo(i,150);

Image5->Canvas->LineTo(i,150 - arr_Green[i]/80);

Image4->Canvas->Pen->Color = clBlue;

Image4->Canvas->MoveTo(i,150);

Image4->Canvas->LineTo(i,150 - arr_Blue[i]/80);

}

}

畫出PDF圖再介面右半邊

//---------------------------------------------------------------------------

void __fastcall TForm1::CDFClick(TObject *Sender)

{

BSum=0;

RSum=0;

GSum=0;

for(i=0; i<=255; i++)

{

arr_Blue[i] = 0;

arr_Green[i] = 0;

arr_Red[i] = 0;

}

一樣先把陣列裡數值歸零

for(j=0; j<iImageHeight; j++)

{

bPtrImageRow = (Byte *)Image2->Picture->Bitmap->ScanLine[j];

for(i=0; i<iImageWidth; i++)

{

arr_Blue[bPtrImageRow[3*i+0]]++;

arr_Green[bPtrImageRow[3*i+1]]++;

arr_Red[bPtrImageRow[3*i+2]]++;

}

}

跟畫PDF時一樣計算出色彩值0-255每個值出現的次數

for(i=0; i<=255; i++)

{

BSum+=arr_Blue[i];

RSum+=arr_Red[i];

GSum+=arr_Green[i];

Image4->Canvas->Pen->Color = clBlue;

Image4->Canvas->MoveTo(i,150);

Image4->Canvas->LineTo(i,150 - BSum/3000);

Image5->Canvas->Pen->Color = clGreen;

Image5->Canvas->MoveTo(i,150);

Image5->Canvas->LineTo(i,150 - GSum/3000);

Image6->Canvas->Pen->Color = clRed;

Image6->Canvas->MoveTo(i,150);

Image6->Canvas->LineTo(i,150 - RSum/3000);

}

}

畫出CDF圖

而那個除3000是為了讓極值不會衝出畫面

//---------------------------------------------------------------------------

void __fastcall TForm1::ClearClick(TObject *Sender)

{

iImageWidth4=Image4->Picture->Width;

iImageHeight4=Image4->Picture->Height;

for(j=0;j<=iImageWidth4;j++)

{

Image4->Canvas->Pen->Color = clWhite;

Image4->Canvas->MoveTo(j,0);

Image4->Canvas->LineTo(j,iImageHeight4);

Image5->Canvas->Pen->Color = clWhite;

Image5->Canvas->MoveTo(j,0);

Image5->Canvas->LineTo(j,iImageHeight4);

Image6->Canvas->Pen->Color = clWhite;

Image6->Canvas->MoveTo(j,0);

Image6->Canvas->LineTo(j,iImageHeight4);

}

將圖用白色覆蓋過去

這是第一次用C++Builder寫程式,所以當然只能多

參考多問別人,語法也跟之前用的程式差異滿大的,

除了語法外的問題大概就時畫圖時即直飛出畫面

外了。