Nano RP2040 FIR without sensor

Arduino Boards
1

Hi, I’m trying to create an in memory thermal image from external data (acquired serially from another board) but since the RP2040 doesn’t have a sensor on It I can’t make the base image to use with draw_ir.
Is there any way I can accomplish that?

2

The image object can be used for this. You can just directly do get/set_pixel on an image buffer.

3

The sensor module should also be enabled, but you only need the image module for that, see

https://docs.openmv.io/library/omv.image.html#image.image.Image

4

Dear kwagyeman and iabdalkader when I try to use sensor module on my RP2040 board I get:

import sensor
>>>RuntimeError: Failed to detect the image sensor or image sensor is detached.

When I try to create an image object from a file on disk on my RP2040 I get:

import image
img = image.Image('a.bmp')
>>>OSError: Image I/O is not supported

By the way, I can’t figure out how to create a in memory image object from the documentation, even on my great four years old OpenMV H7 board:

…Alternatively, you may pass a width, height, and either sensor.BINARY, sensor.GRAYSCALE, or sensor.RGB565 to create new blank image object (initialized to 0 - black).

import sensor
import image
img = image.Image((32,24,sensor.RGB565))
>>>TypeError: can't convert 'tuple' object to str implicitly

Sure this tuple way is not correct, just an example from a novice try by reading the docs.

Any ideas?

5

I figure out my stupidity on in memory image creation after check the source code.

import image
img = image.Image(32,24,0xc030002)

I found that sensor.RGB565 = 0xc030002 in order to avoid to import sensor module.

Sorry for the misunderstood, closing the topic.

Hey OpenMV team, keep up with your fantastic work! :smiley:

6

The image object contains the same defines.

7

Thanks again kwagyeman.
Here is some sample code for reference:

import image, fir
x = 32
y = 24
scale = 3
img = image.Image(x*scale, y*scale, image.RGB565)
fir.init(fir.FIR_NONE)
ir = [i/10 for i in range(x*y)] #sample data
fir.draw_ir(img, (x, y, ir), x_scale=scale, y_scale=scale)