Raw Bayer Pattern Data

griller9876 · October 8, 2021, 9:35am

Dear Community,

I am wondering is it possible to get real raw sensor data from AR1820HS Camera. I would like to have an Image with Bayer Data with no interpolation between the Pixels. The result should look like an Array of x,y (3040,4056)(no 3. Dimension). Pixel (0,0) should store the information for the Blue Pixel 0,1 for the first Green Pixel, 1,0 for the second Green Pixel and 1,1 for the Red Pixel, and so on. This depends on the Bayer Pattern. The result should not be compress in any way, like a jpeg compression would do. I am working on RP 4 8 GB. In the best case, someone can provide a Python code example or give me a hint on how to start. Any help is appreciated.

Thank you very much.

wong · October 13, 2021, 5:14am

Hi @griller9876

Can you tell me the API you are using?
If it is MIPI_Camera then you can check this example:

github.com

ArduCAM/MIPI_Camera/blob/master/RPI/python/capture_raw.py

import arducam_mipicamera as arducam
import v4l2 #sudo pip install v4l2
import time

def set_controls(camera):
    try:
        print("Reset the focus...")
        camera.reset_control(v4l2.V4L2_CID_FOCUS_ABSOLUTE)
    except Exception as e:
        print(e)
        print("The camera may not support this control.")

    try:
        print("Enable Auto Exposure...")
        camera.software_auto_exposure(enable = True)
        print("Enable Auto White Balance...")
        camera.software_auto_white_balance(enable = True)
    except Exception as e:
        print(e)

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github.com

ArduCAM/MIPI_Camera/blob/master/RPI/capture_raw.c

#include "arducam_mipicamera.h"
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#define LOG(fmt, args...) fprintf(stderr, fmt "\n", ##args)

void save_image(CAMERA_INSTANCE camera_instance, const char *name, int width, int height) {
    IMAGE_FORMAT fmt = {IMAGE_ENCODING_RAW_BAYER, 0};
    // The actual width and height of the IMAGE_ENCODING_RAW_BAYER format and the IMAGE_ENCODING_I420 format are aligned, 
    // width 32 bytes aligned, and height 16 byte aligned.
    BUFFER *buffer = arducam_capture(camera_instance, &fmt, 6000);
    if (!buffer) {
        LOG("capture timeout.");
        return;
    }
    if(0){
        BUFFER *buffer2 = arducam_unpack_raw10_to_raw8(buffer->data, width, height);
        arducam_release_buffer(buffer);
        buffer = buffer2;

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