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| Create a bmp |
 Posted: Mon Oct 01, 2007 5:28 am |
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Hello,
I'm working with a PIC 18f4550 and a camera and i want to test it.
Is there any library to create a bmp or similar?
thanks |
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jma_1
Joined: 08 Feb 2005
Posts: 147
Location: Wisconsin
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| Posted: Tue Oct 02, 2007 11:42 am |
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Please be more specific with the question. Do you want to load a file from the camera to the pic? Why?
Bit maps are inherently large. Images like TIF, GIF, JPEG contain image compression and are smaller. What format is the data in on the camera? I believe most digital cameras use JPG by default. Are you trying to convert an image format in the pic? Are you trying to write an image onto an LCD?
Without specifics, I can only reply with questions.
JMA |
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SherpaDoug
Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA
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| Posted: Wed Oct 03, 2007 7:48 am |
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Here is some code I wrote a long time ago for a PIC to send a small .BMP file to a PC. The project never worked but I THINK this code is OK.
| Code: | void Frame_Capture();
int Read_SPI(int Addr);
int Write_SPI(int Addr, int Data);
int MBurst();
int Address;
int j,k;
void Put4(int32 value); //sends value as 4 bytes
// setup image size
#define width 30
#define height 30
//Send .BMP bitmapfileheader
putc('B'); //Fixed 'BM'
putc('M');
Put4(2814); //four bytes of file size = 14+40+30*92=2814=0x00000AFE
Put4(0); //2 reserved words 2 bytes each = 0
Put4(54); //offset from the beginning of the file to the bitmap data
// = 14+40=54=0x00000036
//Send .BMP bitmapinfoheader
Put4(40); //size of bitmapinfoheader
Put4(width); //image width in pixels
Put4(height); //image height in pixels
Put4(0x00180001); //1 plane + 24 bits/pixel * 2^16=1572865
Put4(0); //No compression
Put4(2760); //size on image in bytes ((30*3)+2)*30
Put4(15748); //pixels/meter horiz 400 DPI
Put4(15748); //pixels/meter vert 400 DPI
Put4(0); //Colors/pixel used
Put4(0); //"important" colors????
//No color table with 24 bits/pixel
Frame_Capture();
} //End if(kbhit())
} //End While(1)
}
void Frame_Capture(){ // Gets a frame and sends in .BMP format
int row;
int column;
int pixel;
int Addr = 0x40; //Pixel_Burst register
int I;
Write_SPI(0x13, 0); //Write something to Frame Capture register
delay_ms(7); //worst case frame time
output_low(SPI_NCS); //Send Address
for (I=0; I<8; I++) { /* bit-bash 8 bits */
delay_us(1);
output_low(SCLK);
(Addr & 0x80) ? output_float(MOSI) : output_low(MOSI);
Addr<<=1; /* Shift out Addr bit by bit */
delay_us(1); /* Tsetup, MOSI */
output_float(SCLK);
}
delay_us(50); /* Tsrad */
// Read 900 pixel results
for(row=0; row<height; row++){
for(column=0; column<width; column++){
for (I=0; I<8; I++) { /* read bits */
delay_us(1);
output_low(SCLK);
delay_us(1);
shift_left(&pixel,1,input(MISO));
output_float(SCLK);
}
pixel <<= 2; //shift pixels to 8 bits
putc(pixel), putc(pixel), putc(pixel);
//for grayscale use same value for RG&B
}
putc(0), putc(0); //need to pad each row to 4 byte boundry
//30*3+2=92 bytes assumes 30x30 pixel image
}
output_float(SPI_NCS);
}
void Put4(int32 value){ //sends value as 4 bytes
putc(make8(value, 0));
putc(make8(value, 1));
putc(make8(value, 2));
putc(make8(value, 3));
}
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