hi_isp_cmos_ca

Description

Defines the CMOS parameters of CA.

Definition

typedef struct {
    hi_bool   enable;
    hi_u16    y_ratio_lut[HI_ISP_CA_YRATIO_LUT_LENGTH];
    hi_s16    iso_ratio[HI_ISP_AUTO_ISO_NUM]; 
} hi_isp_cmos_ca;

Members

Member	Description
enable	CA module enable HI_FALSE: disabled HI_TRUE: enabled
y_ratio_lut	Gain for adjusting the chrominance UV based on the luminance Y in CA mode. The luminance is evenly divided into 256 parts, and 256 adjustment coefficient As are configured accordingly for adjusting the UV value. During adjustment, a smaller Y value (dark region) corresponds to a smaller gain A, which can effectively suppress chrominance noise in dark regions. If the luminance gain is set to a larger value, the colors in the bright regions are brighter. Value range: [0, 2047] #define HI_ISP_CA_YRATIO_LUT_LENGTH 256
iso_ratio[HI_ISP_AUTO_ISO_NUM]	Gain B for adjusting the chrominance UV based on the ISO value in CA mode. This is a global gain, that is, the ISO value is fixed, and the UV adjustment gains for all pixels in the image are gain B. You are advised to set gain B to a larger value when the ISO value is small and to a smaller value when the ISO value is large (low illuminance). In this way, chrominance noise in dark regions under low illuminance is reduced. Value range: [0, 2047] #define HI_ISP_AUTO_ISO_NUM 16

Member

Description

enable

CA module enable

HI_FALSE: disabled
HI_TRUE: enabled

y_ratio_lut

Gain for adjusting the chrominance UV based on the luminance Y in CA mode. The luminance is evenly divided into 256 parts, and 256 adjustment coefficient As are configured accordingly for adjusting the UV value. During adjustment, a smaller Y value (dark region) corresponds to a smaller gain A, which can effectively suppress chrominance noise in dark regions. If the luminance gain is set to a larger value, the colors in the bright regions are brighter.

Value range: [0, 2047]

#define HI_ISP_CA_YRATIO_LUT_LENGTH               256

iso_ratio[HI_ISP_AUTO_ISO_NUM]

Gain B for adjusting the chrominance UV based on the ISO value in CA mode. This is a global gain, that is, the ISO value is fixed, and the UV adjustment gains for all pixels in the image are gain B. You are advised to set gain B to a larger value when the ISO value is small and to a smaller value when the ISO value is large (low illuminance). In this way, chrominance noise in dark regions under low illuminance is reduced.

Value range: [0, 2047]

#define HI_ISP_AUTO_ISO_NUM 	16

Parent topic: Data Types