hi_isp_cmos_drc

Description

Defines the CMOS parameters of DRC.

Definition

typedef struct {
    hi_bool enable;
    hi_op_mode op_type;

    hi_u16  manual_strength;
    hi_u16  auto_strength;

    hi_u8   spatial_flt_coef;
    hi_u8   range_flt_coef;
    hi_u8   contrast_control;
    hi_s8   detail_adjust_factor;
    hi_u8   range_ada_max;

    hi_u8   grad_rev_max;
    hi_u8   grad_rev_thr;

    hi_u8   bright_gain_lmt;
    hi_u8   bright_gain_lmt_step;
    hi_u8   dark_gain_lmt_y;
    hi_u8   dark_gain_lmt_c;

    hi_u8   purple_reduction_strength;
    hi_u8   local_mixing_bright_max;
    hi_u8   local_mixing_bright_min;
    hi_u8   local_mixing_bright_thr;
    hi_s8   local_mixing_bright_slo;
    hi_u8   local_mixing_dark_max;
    hi_u8   local_mixing_dark_min;
    hi_u8   local_mixing_dark_thr;
    hi_s8   local_mixing_dark_slo;
    hi_u16  color_correction_lut[HI_ISP_DRC_CC_NODE_NUM];
    hi_u16  tone_mapping_value[HI_ISP_DRC_TM_NODE_NUM];

    hi_u8   asymmetry;
    hi_u8   second_pole;
    hi_u8   stretch;
    hi_u8   compress;

    hi_u8   curve_sel;

} hi_isp_cmos_drc;

Members

Member	Description
enable	Enable switch. The options are as follows: HI_FALSE: disabled HI_TRUE: enabled
op_type	DRC operating mode. The options are as follows: HI_OP_MODE_AUTO: automatic HI_OP_MODE_MANUAL: manual
manual_strength	DRC strength in manual mode. A larger value indicates a higher differential gain between the shadow and highlight. Value range: [0x0, 0x3FF]
auto_strength	DRC strength in automatic mode, which is readable and writable. A larger value indicates greater overall strength. Value range: [0x0, 0x3FF]
spatial_flt_coef	Spatial filtering coefficient for the filter. A larger value indicates less obvious motion halo and a smaller number of details. A smaller value indicates better details and more obvious motion halo. Value range: [0x0, 0x5]
range_flt_coef	Range filtering coefficient for the filter. A larger value indicates more obvious halo. And a smaller value indicates less obvious halo but more possible borders at strong edges. Value range: [0x0, 0xA]
contrast_control	Local contrast control. The parameter effect is related to the image luminance distribution. The recommended value range is 6 to 10. Value range: [0x0, 0xF]
detail_adjust_factor	Detail adjustment coefficient for the filter. A larger value indicates stronger overall detail. Value range: [-0xF, 0xF]
range_ada_max	Adaptive range of the filtering coefficient. The filtering coefficient that takes effect is within the range of [range_flt_coef, MIN(range_flt_coef + range_ada_max, 0xA)]. Increasing the value of this parameter helps to weaken the boundaries, but may cause the loss of the details of the backlight object. Value range: [0x0, 0x8]
grad_rev_max	Strength of border line correction. A larger value indicates that the border line is weakened more obviously, but may cause details loss. Value range: [0x0, 0x40]
grad_rev_thr	Border line detection threshold. A larger value indicates that the border line is weakened more obviously, but may cause details loss. Value range: [0x0, 0x80]
bright_gain_lmt	Target value of the luminance gain limit of the bright region. A larger value indicates a higher limit. Value range: [0x0, 0xF]
bright_gain_lmt_step	Adaptive step of the luminance gain limit of the bright region. A smaller value indicates a higher limit. Value range: [0x0, 0xF]
dark_gain_lmt_y	Luminance gain limit of the dark region. A larger value indicates a higher limit. Value range: [0x0, 0x85]
dark_gain_lmt_c	Chrominance gain limit of the dark region A larger value indicates a higher limit. Value range: [0x0, 0x85]
purple_reduction_strength	Strength of purple fringing correction. A larger value indicates greater correction strength. Value range: [0x0, 0x80]
local_mixing_bright_max	Parameter used for controlling the maximum gain for positive details (linear detail enhancement) Value range: [0x0, 0x80]
local_mixing_bright_min	Parameter used for controlling the minimum gain for positive details (linear detail enhancement) Value range: [0x0, 0x40]
local_mixing_bright_thr	Parameter used for controlling the threshold of the positive detail gain that is adaptive to the luminance (linear detail enhancement). When the pixel luminance exceeds the threshold, the gain shifts from the maximum value to the minimum value (depending on the plus-minus sign of the slope parameter). Value range: [0x0, 0xFF]
local_mixing_bright_slo	Parameter used for controlling the slope parameter of the positive detail gain that is adaptive to the luminance (linear detail enhancement). A larger absolute value indicates a faster shift from the minimum value to the maximum value and vice versa. Value range: [-0x7, 0x7]
local_mixing_dark_max	Parameter used for controlling the maximum gain for negative details (linear detail enhancement) Value range: [0x0, 0x80]
local_mixing_dark_min	Parameter used for controlling the minimum gain for negative details (linear detail enhancement) Value range: [0x0, 0x40]
local_mixing_dark_thr	Parameter used for controlling the threshold of the negative detail gain that is adaptive to the luminance (linear detail enhancement). When the pixel luminance exceeds the threshold, the gain shifts from the minimum value to the maximum value (depending on the plus-minus sign of the slope parameter). Value range: [0x0, 0xFF]
local_mixing_dark_slo	Parameter used for controlling the slope parameter of the negative detail gain that is adaptive to the luminance (linear detail enhancement). A larger absolute value indicates a faster shift from the minimum value to the maximum value and vice versa. Value range: [-0x7, 0x7]
color_correction_lut	Color correction coefficient LUT. A smaller value indicates lower saturation. Value range: [0x0, 0x400] #define HI_ISP_DRC_CC_NODE_NUM 33
tone_mapping_value	User-defined tone mapping curve LUT Value range: [0x0, 0xFFFF] #define HI_ISP_DRC_TM_NODE_NUM 200
asymmetry	Parameter used for generating the asymmetry curve. A smaller value indicates more obvious luminance stretching in the dark region. Value range: [1, 30]
second_pole	Parameter used for generating the asymmetry curve. A smaller value indicates stronger luminance suppression in the bright region and better retention of highlighted details. Value range: [150, 210]
stretch	Parameter used for generating the asymmetry curve. A smaller value indicates brighter overall luminance. Value range: [30, 60]
compress	Parameter used for generating the asymmetry curve. A smaller value indicates brighter overall luminance. Value range: [100, 200]
curve_sel	DRC tone mapping curve select. The options are as follows: 0: asymmetry curve 1: user-defined curve

Parent topic: Data Types