After selecting the photo, the returned base64 string is incomplete

[Disoc]

const options: ImagePickerOptions = {
  maximumImagesCount: 1,
  // width: 300,
  height: 350,
  quality: 90,
  outputType: 1
};    

this.imagePicker.getPictures(options).then((results) => {
if (results) {
if (type == 'top') {
for (var i = 0; i < results.length; i++) {
this.imageUrl = 'data:image/jpg;base64,' + results[i];
this.frontImg = results[i];
console.log('Image URI: ' + results[i]);
}
} else {
for (var j = 0; j < results.length; j++) {
this.imageUrlBack = 'data:image/jpg;base64,' + results[j];
this.backImg = results[j];
}
}
}
this.nativeService.hideLoading();
}, (err) => {
this.nativeService.hideLoading();
alert(err);
});

After selecting the photo, the returned base64 string is incomplete,However, I set the height below 200, and the returned base64 string is complete, but the picture is too blurry