高通 eeprom lsc值的计算

在eeprom烧录中 lsc的值需要驱动中自己计算
LSC: Lens shading and Color shading

reasons:

1. Camera module assembly variation such as l ens holder alignment with camera module
2. Lens assembly variation
3. Sensor micro lens variation(sensor CRA variation).
4. Pan/tilt of image sensor during assembly

计算

数据存放格式
总共抓取17*13 block，获取每块的四通道平均值：
R_spc = (Measured Red average / R_max) * 1023;
Gr_spc = (Measured Gr average / Gr_max)*1023;
Gb_spc = (Measured Gb average / Gb_max)*1023;
B_spc = (Measured Blue average / B_max) *1023;

低位在前 高位在后

	lsc_buf = e_ctrl->eeprom_params.buffer + LSC_DATA_OFFSET;for (light = 0; light < ROLLOFF_MAX_LIGHT; light++) {e_ctrl->eeprom_data.lsc.lsc_calib[light].mesh_rolloff_table_size =LSC_GRID_SIZE;}for (i = 0; i < LSC_GRID_SIZE * 8; i += 8) {gain_r  = lsc_buf[i + 0]  | lsc_buf[i + 1]<< 8;gain_gr = lsc_buf[i + 2]  | lsc_buf[i + 3]<< 8;gain_gb = lsc_buf[i + 4]  | lsc_buf[i + 5]<< 8;gain_b  = lsc_buf[i + 6]  | lsc_buf[i + 7]<< 8;for (light = 0; light < ROLLOFF_MAX_LIGHT; light++) {e_ctrl->eeprom_data.lsc.lsc_calib[light].r_gain[i/8]  = gain_r;e_ctrl->eeprom_data.lsc.lsc_calib[light].gr_gain[i/8] = gain_gr;e_ctrl->eeprom_data.lsc.lsc_calib[light].gb_gain[i/8] = gain_gb;e_ctrl->eeprom_data.lsc.lsc_calib[light].b_gain[i/8]  = gain_b;}}

高位在前 低位在后

	lsc_buf = e_ctrl->eeprom_params.buffer + LSC_DATA_OFFSET;for (light = 0; light < ROLLOFF_MAX_LIGHT; light++) {e_ctrl->eeprom_data.lsc.lsc_calib[light].mesh_rolloff_table_size =LSC_GRID_SIZE;}for (i = 0; i < LSC_GRID_SIZE * 8; i += 8) {gain_r  = lsc_buf[i + 0] << 8 | lsc_buf[i + 1];gain_gr = lsc_buf[i + 2] << 8 | lsc_buf[i + 3];gain_gb = lsc_buf[i + 4] << 8 | lsc_buf[i + 5];gain_b  = lsc_buf[i + 6] << 8 | lsc_buf[i + 7];for (light = 0; light < ROLLOFF_MAX_LIGHT; light++) {e_ctrl->eeprom_data.lsc.lsc_calib[light].r_gain[i/8]  = gain_r;e_ctrl->eeprom_data.lsc.lsc_calib[light].gr_gain[i/8] = gain_gr;e_ctrl->eeprom_data.lsc.lsc_calib[light].gb_gain[i/8] = gain_gb;e_ctrl->eeprom_data.lsc.lsc_calib[light].b_gain[i/8]  = gain_b;}}

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