fruchti/inverse_thermal_camera
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Wait until 20% to 80% of all pixels are black

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This commit is contained in:
fruchti 2019-11-14 14:48:25 +01:00
parent 2b341fd39f
commit b9824ddee3
3 changed files with 15 additions and 2 deletions
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2
build-number.txt
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@ -1 +1 @@
492 495

9
src/ov7670.c
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@ -154,6 +154,7 @@ uint8_t LineBuffer[CAMERA_IMAGE_WIDTH + 40];
int LineCount = 0; int LineCount = 0;
static int FrameCount = 0; static int FrameCount = 0;
volatile int Camera_Captured = 0; volatile int Camera_Captured = 0;
unsigned int BlackPixels = 0;
static uint8_t ReadRegister(uint8_t reg) static uint8_t ReadRegister(uint8_t reg)
{ {
@ -310,7 +311,9 @@ void TIM1_CC_IRQHandler(void)
CurrentLine = 0; CurrentLine = 0;
FrameCount++; FrameCount++;
if(FrameCount == 5) // Check if the last frame's exposure is reasonable
if(BlackPixels >= (unsigned)(CAMERA_PIXELS * CAMERA_EXPOSURE_LOW)
&& BlackPixels <= (unsigned)(CAMERA_PIXELS * CAMERA_EXPOSURE_HIGH))
{ {
Camera_Captured = 1; Camera_Captured = 1;
// Disable everything // Disable everything
@ -318,6 +321,9 @@ void TIM1_CC_IRQHandler(void)
TIM1->CR1 = 0; TIM1->CR1 = 0;
} }
// Reset black pixel counter
BlackPixels = 0;
// Dummy read // Dummy read
TIM1->CCR2; TIM1->CCR2;
TIM1->SR &= ~TIM_SR_CC2IF; TIM1->SR &= ~TIM_SR_CC2IF;
@ -351,6 +357,7 @@ void TIM3_IRQHandler(void)
error = pixel; error = pixel;
ImageBuffer[(line * CAMERA_IMAGE_WIDTH + i) / 8] |= ImageBuffer[(line * CAMERA_IMAGE_WIDTH + i) / 8] |=
0x80 >> (i % 8); 0x80 >> (i % 8);
BlackPixels++;
} }
else else
{ {

6
src/ov7670.h
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@ -5,6 +5,12 @@
#define CAMERA_IMAGE_WIDTH 160 #define CAMERA_IMAGE_WIDTH 160
#define CAMERA_IMAGE_HEIGHT 144 #define CAMERA_IMAGE_HEIGHT 144
#define CAMERA_PIXELS (CAMERA_IMAGE_WIDTH * CAMERA_IMAGE_HEIGHT)
// Maximum and minimum share of black pixels for an image to be accepted
#define CAMERA_EXPOSURE_LIMIT 0.4
#define CAMERA_EXPOSURE_LOW (0.5 - CAMERA_EXPOSURE_LIMIT)
#define CAMERA_EXPOSURE_HIGH (0.5 + CAMERA_EXPOSURE_LIMIT)
extern volatile int Camera_Captured; extern volatile int Camera_Captured;