mirror of
https://github.com/jomjol/AI-on-the-edge-device.git
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89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
// Workaround - bug in cam library - enable bits are set without using bitwise OR logic -> only latest enable setting is used
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// Reference: https://esp32.com/viewtopic.php?f=19&t=14376#p93178
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/* The memory structure is as follows for
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byte_0 = enable_bits
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byte_0->bit0 = enable saturation and hue --> OK
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byte_0->bit1 = enable saturation --> OK
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byte_0->bit2 = enable brightness and contrast --> OK
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byte_0->bit3 = enable green -> blue spitial effect (Antique and blunish and greenish and reddish and b&w) enable
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byte_0->bit4 = anable gray -> red spitial effect (Antique and blunish and greenish and reddish and b&w) enable
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byte_0->bit5 = remove (UV) in YUV color system
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byte_0->bit6 = enable negative
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byte_0->bit7 = remove (Y) in YUV color system
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byte_1 = saturation1 0-255 --> ?
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byte_2 = hue 0-255 --> OK
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byte_3 = saturation2 0-255 --> OK
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byte_4 = reenter saturation2 in documents --> ?
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byte_5 = spital effect green -> blue 0-255 --> ?
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byte_6 = spital effect gray -> red 0-255 --> ?
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byte_7 = contrast lower byte 0-255 --> OK
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byte_8 = contrast higher byte 0-255 --> OK
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byte_9 = brightness 0-255 --> OK
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byte_10 = if byte_10==4 contrast effective --> ?
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*/
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#include <stdint.h>
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#include "esp_camera.h"
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#include "ov2640_contrast_brightness.h"
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static const uint8_t brightness_regs[6][5] = {
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{0x7C, 0x7D, 0x7C, 0x7D, 0x7D },
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{0x00, 0x04, 0x09, 0x00, 0x00 }, /* -2 */
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{0x00, 0x04, 0x09, 0x10, 0x00 }, /* -1 */
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{0x00, 0x04, 0x09, 0x20, 0x00 }, /* 0 */
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{0x00, 0x04, 0x09, 0x30, 0x00 }, /* +1 */
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{0x00, 0x04, 0x09, 0x40, 0x00 }, /* +2 */
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};
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static const uint8_t contrast_regs[6][7] = {
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{0x7C, 0x7D, 0x7C, 0x7D, 0x7D, 0x7D, 0x7D },
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{0x00, 0x04, 0x07, 0x20, 0x18, 0x34, 0x06 }, /* -2 */
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{0x00, 0x04, 0x07, 0x20, 0x1c, 0x2a, 0x06 }, /* -1 */
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{0x00, 0x04, 0x07, 0x20, 0x20, 0x20, 0x06 }, /* 0 */
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{0x00, 0x04, 0x07, 0x20, 0x24, 0x16, 0x06 }, /* +1 */
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{0x00, 0x04, 0x07, 0x20, 0x28, 0x0c, 0x06 }, /* +2 */
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};
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int ov2640_set_contrast_brightness(sensor_t *sensor, int _contrast, int _brightness)
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{
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int ret=0;
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_contrast += 3;
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if (_contrast <= 0) {
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_contrast = 3;
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}
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else if (_contrast > 5)
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{
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_contrast = 5;
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}
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sensor->status.contrast = _contrast-3;
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_brightness += 3;
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if (_brightness <= 0) {
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_brightness = 3;
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}
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else if (_brightness > 5)
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{
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_brightness = 5;
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}
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int brightness = brightness_regs[_brightness][3];
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sensor->status.brightness = _brightness-3;
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// sensor->set_reg(sensor, int reg, int mask, int value)
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sensor->set_reg(sensor, 0xFF, 0x01, 0x00); // Select DSP bank
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for (int i=0; i<7; i++)
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{
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if (i == 5)
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{
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sensor->set_reg(sensor, contrast_regs[0][i], 0xFF, (brightness | contrast_regs[_contrast][i]));
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}
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else
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{
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sensor->set_reg(sensor, contrast_regs[0][i], 0xFF, contrast_regs[_contrast][i]);
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}
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}
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return ret;
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}
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