OV7725-capure-decode

This code can capture image from OV7725 Serial Camera and decode it using Nanojpeg library.

Compile and Test

To compile the source code open the root folder of the project and type:

make

It is possible that this command shows you some warnings.

Now you can capture image and decode it by executing:

./camera

The image will be stored in image.ppm.

Capture the image

You can capture jpeg images from OV7725 by using functions in camera.h.if you want to capture an image using this library you havr to call following functions in order.

Open port

For opening a serial port you can use serialOpen(address, baudrate). and store the file descriptor. If you are using this code on other platforms like Arduino or Nios. you have to use their own wiring library. The wiring library which is uploaded in this repo is only working in Linux operating system.

Send shot

You have to send a shot order to the camera using sendShot(fd, resolution) function. By this function the camera captures an image and stores it in its memory. You can capture images in four different resolutions:

• 160*128 RES_160X128
• 320*240 RES_320X240
• 640*480 RES_640X480
• 1280*1024 RES_1280X1024 (only for 1.3MGP cameras)

Read details

After sending the sendShot command. You have to read the image details. readImageDetails(fd, picture size, frames count) will tell you the image size and the number of frames that the camera will send you.

Read Image

To read an Image using this code you can call readImage(fd, image buffer, picture size, frames count). This function will read a jpeg image and will store the image in the buffer.

Decode the image

There are lots of libraries that can decode jpeg images. However, I used Nanojpeg becaue it's a light library and it's suitable to use on embedded designs. you can find how to decode images using Nanojpeg in its website.