Issue in converting the Pixels values to image

Projects Programming
4

this has little to do with Arduino, it's more a question for a Python forum...

when you do

h, w, *pixels = re.findall(r'[0-9]+', contents)

you use regular expression pattern matching.
h takes the first value from contents
w takes the second value from contents
pixels is the rest
so in your case you use the first two values 117 and 111 and height and width...

then you use h and w to reshape the array

na = np.array(pixels, dtype=np.uint8).reshape((int(h),int(w),3))

==> the size has to make sense, here it does not...

try this to see it:

import re
import numpy
contents = "6,3,117,111,124,124,120,140,142,157,167,172,184,190,194,188,182,185,188,1"
h, w, *pixels = re.findall(r'[0-9]+', contents)
print(h)
print(w)
print(pixels)
na = numpy.array(pixels, dtype=numpy.uint8).reshape((int(h),int(w),1))
print(na)

h will be 6 and w will be 3

pixels will be ['117', '111', '124', '124', '120', '140', '142', '157', '167', '172', '184', '190', '194', '188', '182', '185', '188', '1']

and na will be

[[[117]
  [111]
  [124]]

 [[124]
  [120]
  [140]]

 [[142]
  [157]
  [167]]

 [[172]
  [184]
  [190]]

 [[194]
  [188]
  [182]]

 [[185]
  [188]
  [  1]]]

the size is available, just print height and width before spitting out the pixels, this is the struct representing the framebuffer

typedef struct {
    uint8_t * buf;              /*!< Pointer to the pixel data */
    size_t len;                 /*!< Length of the buffer in bytes */
    size_t width;               /*!< Width of the buffer in pixels */
    size_t height;              /*!< Height of the buffer in pixels */
    pixformat_t format;         /*!< Format of the pixel data */
    struct timeval timestamp;   /*!< Timestamp since boot of the first DMA buffer of the frame */
} camera_fb_t;