openmv/scripts/examples/02-Image-Processing/00-Drawing/image_drawing_with_custom_palette.py
2023-07-05 19:03:37 +02:00

64 lines
1.9 KiB
Python

# Draw Image Example with custom color palette
#
# This example shows off how to draw images in the frame buffer with a custom generated color palette.
import sensor
import image
import time
sensor.reset()
sensor.set_pixformat(sensor.GRAYSCALE) # or GRAYSCALE...
sensor.set_framesize(sensor.QQVGA) # or QQVGA...
sensor.skip_frames(time=2000)
clock = time.clock()
# the color palette is actually an image, this allows you to use image ops to create palettes
# the image must have 256 entries i.e. 256x1, 64x4, 16x16 and have the format rgb565
# Initialise palette source colors into an image
palette_source_colors = [(255, 0, 0), (0, 255, 0), (0, 0, 255), (255, 0, 255)]
palette_source_color_image = image.Image(len(palette_source_colors), 1, sensor.RGB565)
for i, color in enumerate(palette_source_colors):
palette_source_color_image[i] = color
# Scale the image to palette width and smooth them
palette = image.Image(256, 1, sensor.RGB565)
palette.draw_image(
palette_source_color_image,
0,
0,
x_scale=palette.width() / palette_source_color_image.width(),
)
palette.mean(int(palette.width() / palette_source_color_image.width() / 2))
while True:
clock.tick()
img = sensor.snapshot()
# Get a copy of grayscale image before converting to color
img_copy = img.copy()
img.to_rgb565()
palette_boundary_inset = int(sensor.width() / 40)
palette_scale_x = (sensor.width() - palette_boundary_inset * 2) / palette.width()
img.draw_image(img_copy, 0, 0, color_palette=palette)
img.draw_image(
palette,
palette_boundary_inset,
palette_boundary_inset,
x_scale=palette_scale_x,
y_scale=8,
)
img.draw_rectangle(
palette_boundary_inset,
palette_boundary_inset,
int(palette.width() * palette_scale_x),
8,
color=(255, 255, 255),
thickness=1,
)
print(clock.fps())