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Code Issues Packages Projects Releases Wiki Activity

Add "colormode" option

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This commit is contained in:
Thomas Farstrike
2025-11-28 18:14:54 +01:00
parent 1b0eb8d837
commit 55b5c66941
1 changed files with 15 additions and 28 deletions
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internal_filesystem/apps/com.micropythonos.camera/assets/camera_app.py
+15 -28
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@@ -1,10 +1,3 @@
# This code grabs images from the camera in RGB565 format (2 bytes per pixel)
# and sends that to the QR decoder if QR decoding is enabled.
# The QR decoder then converts the RGB565 to grayscale, as that's what quirc operates on.
# It would be slightly more efficient to capture the images from the camera in L8/grayscale format,
# or in YUV format and discarding the U and V planes, but then the image will be gray (not great UX)
# and the performance impact of converting RGB565 to grayscale is probably minimal anyway.
import lvgl as lv
from mpos.ui.keyboard import MposKeyboard
@@ -76,7 +69,8 @@ class CameraApp(Activity):
self.main_screen.set_size(lv.pct(100), lv.pct(100))
self.main_screen.set_scrollbar_mode(lv.SCROLLBAR_MODE.OFF)
# Initialize LVGL image widget
self.create_preview_image()
self.image = lv.image(self.main_screen)
self.image.align(lv.ALIGN.LEFT_MID, 0, 0)
close_button = lv.button(self.main_screen)
close_button.set_size(self.button_width, self.button_height)
close_button.align(lv.ALIGN.TOP_RIGHT, 0, 0)
@@ -149,6 +143,7 @@ class CameraApp(Activity):
print(f"camera app: webcam exception: {e}")
if self.cam:
print("Camera app initialized, continuing...")
self.create_preview_image()
self.set_image_size()
self.capture_timer = lv.timer_create(self.try_capture, 100, None)
self.status_label_cont.add_flag(lv.obj.FLAG.HIDDEN)
@@ -200,25 +195,19 @@ class CameraApp(Activity):
self.image.set_scale(min(scale_factor_w,scale_factor_h))
def create_preview_image(self):
self.image = lv.image(self.main_screen)
self.image.align(lv.ALIGN.LEFT_MID, 0, 0)
# Create image descriptor once
self.image_dsc = lv.image_dsc_t({
"header": {
"magic": lv.IMAGE_HEADER_MAGIC,
"w": self.width,
"h": self.height,
#"stride": self.width * 2, # RGB565
"stride": self.width, # RGB565
#"cf": lv.COLOR_FORMAT.RGB565
"cf": lv.COLOR_FORMAT.L8
"stride": self.width * (2 if self.colormode else 1),
"cf": lv.COLOR_FORMAT.RGB565 if self.colormode else lv.COLOR_FORMAT.L8
},
#'data_size': self.width * self.height * 2, # RGB565
'data_size': self.width * self.height, # gray
'data_size': self.width * self.height * (2 if self.colormode else 1),
'data': None # Will be updated per frame
})
self.image.set_src(self.image_dsc)
#self.image.set_size(160, 120)
def qrdecode_one(self):
@@ -263,7 +252,8 @@ class CameraApp(Activity):
except OSError:
pass
if self.current_cam_buffer is not None:
filename=f"data/images/camera_capture_{mpos.time.epoch_seconds()}_{self.width}x{self.height}_RGB565.raw"
colorname = "RGB565" if self.colormode else "GRAY"
filename=f"data/images/camera_capture_{mpos.time.epoch_seconds()}_{self.width}x{self.height}_{colorname}.raw"
try:
with open(filename, 'wb') as f:
f.write(self.current_cam_buffer)
@@ -345,10 +335,8 @@ class CameraApp(Activity):
# Note: image_dsc is an LVGL struct, use attribute access not dictionary access
self.image_dsc.header.w = self.width
self.image_dsc.header.h = self.height
#self.image_dsc.header.stride = self.width * 2 # RGB565
#self.image_dsc.data_size = self.width * self.height * 2 #RGB565
self.image_dsc.header.stride = self.width
self.image_dsc.data_size = self.width * self.height
self.image_dsc.header.stride = self.width * (2 if self.colormode else 1)
self.image_dsc.data_size = self.width * self.height * (2 if self.colormode else 1)
print(f"Image descriptor updated to {self.width}x{self.height}")
# Reconfigure camera if active
@@ -376,13 +364,14 @@ class CameraApp(Activity):
self.status_label_cont.remove_flag(lv.obj.FLAG.HIDDEN)
return # Don't continue if camera failed
self.create_preview_image()
self.set_image_size()
def try_capture(self, event):
#print("capturing camera frame")
try:
if self.use_webcam:
self.current_cam_buffer = webcam.capture_frame(self.cam, "rgb565")
self.current_cam_buffer = webcam.capture_frame(self.cam, "rgb565" if self.colormode else "grayscale")
elif self.cam.frame_available():
#self.cam.free_buffer()
self.current_cam_buffer = self.cam.capture()
@@ -390,13 +379,12 @@ class CameraApp(Activity):
if self.current_cam_buffer and len(self.current_cam_buffer):
# Defensive check: verify buffer size matches expected dimensions
#expected_size = self.width * self.height * 2 # RGB565 = 2 bytes per pixel
expected_size = self.width * self.height # Grayscale = 1 byte per pixel
expected_size = self.width * self.height * (2 if self.colormode else 1)
actual_size = len(self.current_cam_buffer)
if actual_size == expected_size:
self.image_dsc.data = self.current_cam_buffer
#image.invalidate() # does not work so do this:
#self.image.invalidate() # does not work so do this:
self.image.set_src(self.image_dsc)
if not self.use_webcam:
self.cam.free_buffer() # Free the old buffer
@@ -468,8 +456,7 @@ def init_internal_cam(width, height):
xclk_freq=20000000,
powerdown_pin=-1,
reset_pin=-1,
#pixel_format=PixelFormat.RGB565,
pixel_format=PixelFormat.GRAYSCALE,
pixel_format=PixelFormat.RGB565 if self.colormode else PixelFormat.GRAYSCALE,
frame_size=frame_size,
#grab_mode=GrabMode.WHEN_EMPTY,
grab_mode=GrabMode.LATEST,